US2413029A - Chemical feeding apparatus - Google Patents

Description

Dec. 24, 1946.

A. MCFARLAND CHEMICAL FEEDING APPARATUS 3 Sheets-Sheet 1 Filed Nov. 8, 1941 0. ,A www A mili mm M ,vm E R, mm A Jr ww N mm w m n Y B NN Nu .Q S n QN Q w. v w u s N CHEMICAL FEEDING APPARATUS Arrow/s.

Dec. 24, l946. A. F. MCFARLAND CHEMICAL FEEDING APPARATUS Filed Nov. s, 1941 3 sheets-sheet s w Bw S ww..

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M M F. m CWM 7 f i Patented Dec. 24, 194s CHEMICAL FEEDING APPARATUS Artie F. McFarland, Houston, Tex., asslgnor, by d'rect and mesne assignments, to McFarland Manufacturing Corporation, Houston, Tex;, a

corporation of Texas Application November 8, 1941, Serial No. 418,338

' 18 Claims. l

This invention relates to a chemical feeding apparatus and particularly to that type of apparatus which may be employed for feeding a chemical or some other liquid substance into a flowing stream of gas or liquid. It has .for its general object the provision of a device of the character referred to which will feed the chemical or gas or liquid substance into the flowing stream in a substantially iixed proportion to the substance of said owing stream. In other words, it will produce a mixture of the substance of the flowing stream with the chemical, which mixture -will besubstantially constant in its proportion.

It is not intended that this invention shall be limited to the feeding of any specic liquid into any other specific gas or liquid, but that it shall be applicable to all caseslwhere it is desired to mix with a flowing stream of either gas or liquid a substantially xed proportion of another liquid.

Another object of this inventionvis to provide such a device which will be automatic in its operation and will not cease to function and have to be refilled at intervals.

Another object of this invention is' to provide a device of the character referred to in which Ythere is a feeding chamber which will be autouid it is desired to cause the mixture of a definite proportion of liquid the injection of which is accomplished by this invention. Inserted in this ow line or conduit I is a control valve 2 which is made very much-like the ordinary cutoi valve but which is so arranged as to be controlled by the flow of iluid through the conduit I insteadof to control the flow of uid through this conduit.

The valve 2 instead of having the usual member which seats upon a seat to shut off the ow of uid, has a plunger member 3 carried on stem 4 which -is mounted for reciprocation through a suffing box 5 having packing E therein held in place by a gland 'I and a nut 8. The plunger 3 is generally speaking of cylindrical form slidable longitudinally through the opening in the valve housing in which itprovides a substantially close fit. 'Ihis element 3 however is ,provided with a V-shaped notch 9 which is so disposed that as the element 3 ls moved through the opening in which it is fitted, by the pressure of uid in the conduit I, the ow of such uid will be permitted in increasing quantities through the notch 9. In other words, it will be seen that the element 3 will be moved through the opening in which it is mounted by a suflicient distance to accommodate the quantity of flow that is passing through the conduit I, and when it has moved such a distance its movement will thereafter cease. The element 3 and stem 4 may be made of such weight that when flow of fluid through Fig.l1 is a diagrammatic View with parts broken away and shown in longitudinal cross section illustrating one embodiment of this invention with the parts in the position which they occupy during the feeding of liquid into the flowing stream just after the liquid reservoir of the device has been filled.

Fig. 2 is a view similar to Fig. l but illustrating the parts in the position which they occupy just after the reservoir for the liquid has been emptied and at the beginning of the operation of refilling the reservoir.

Fig. 3 is a view similar to Fig. 1 but showing a modied form.

Referring now more particularly to the form illustrated in Figs. 1 and 2 of the drawings, the numeral I illustrates a conduit through which'a, fluid flow is adapted to take place and with which the conduit I is reduced or stopped the element 3 and stem II will drop to a position such that they will entirely close the opening through the valve 2, or if found desirable some other means may be provided 'for returning these elements to their closed position. In any event the pressure of uid in the line I will tend to close this valve and will do so if this pressure is substantially above atmospheric.

The lower or external end of the stem 4 is of reduced diameter and extends through a stuiling box II) into avalve housing I I and has a valve element I2 formed. thereon, this element being in the illustration in the form of a needle valve so as to regulate the flow of fluid through the housing II. This .valve housing II is connected by means of a conduit I3 to the conduit I on the upstream side of the valve 2, and is connected by means of a conduit I4 to a port I5in a slide valve housing I6. Another port I1 of this slide valve housing is connected by a conduit I3 to the conduit I on the downstream side of the valve 2.

Directly opposite-.the port I5, the slide valve closure housing I3 is provided with a port I3 and this port is connected by the means of a conduit 23 to one end of a feed cylinder or reservoir 2 I. The opposite end of this feed cylinder or reservoir is connected by a conduit 22 to a port 23 in the slide valve housing, the port 23 being substantially 'directly opposite the port I1.

The cylinder` or reservoir 2| is adapted to contain the chemical or other liquid which is to be fed into and mixed with the stream of iluid flowing through the conduit I. Slidably mounted in this cylinder on the piston rod 24 is a piston 25, the same being provided with suitable packing for the purpose of forming a seal with the inner surfaces of the walls of the cylinder 2 I.

The piston rod 24 extends through the head 28 of the cylinder 2| and into a chamber 21 which is secured to the head 25 and extends a substantial distance therefrom. This chamber is connected by means of a conduit 28 to a port 28 in the slide valve housing I6.

Also extending from the piston 25 in a direction substantially parallel to the piston rod 24 and through a stuiilng box 38 in the head 26 is a control rod 3l. 'I'he outer end of this control rod is provided with an extension 32 adjustably secured thereto by means such as a pin 33 and having an opening 34 therethrough for the purpose of forming a receptacle for the lever 35 which controls the operation of the four-way valve 36.

One of the connections `to this four-way valve is by way of conduit 31 to the conduit I4 leading from the valve II. A second connection is by means of a conduit 38 leading to a port 33 in the slide valve housing I5, this port being adjacent to the port 23 with which the conduit 28 is connected. The third and fourth connections to the four-way valve 36 are by Way of the conduits 48 and 4I respectively-to the opposite ends of the slide valve housing. and provide communication with the interiors of the-cylinders 42 and 43 respectively at the ends of said housing. -These cylinders are provided by means of the caps 44 and 45 which are respectively threaded on to the opposite ends ofthe slide valve housing I 6.

'I'he conduit 46 leading from a source of chemical supply is connected to a port 41 in the slide valve housing adjacent to the port 23. The conduit 33 is also vented through a pipe 48 which pipe connects by means of a branch 48 with a port 50 in the slide valve housing adjacent to the port I9.

The slide valve 5I which is slidable endwise within the .housing I6 has pistons 52 and 53 mounted respectively in the cylinders or chambers 42 and 43 on the opposite ends of the slide valve housing. 'Ihese pistons are appropriately formed to provide sliding seals against the walls of the chambers 42 and 43 and to be moved by pressure within said respective chambers in order to shift the slide valve 5I from one position to another.

The slide valve 5I is also provided with openings 54 and 55 extending transversely thereof, the opening 54 being adapted to connect the ports I5 and I3 when the slide valve is in one position and the opening 55 being adapted to connect the ports I1 and 23 when the slide valve is in the same position. When in this same position the slide valve has a passage 56 at an appropriate position on its surface to provide a connection between the conduit 23 and the conduit 38. A

When in its opposite position the slide valve has a passage 51 in one surface communicating with one end of the opening 54 so that this passage of the slide valve housing Prior to this shifting 51 and the opening 54 will provide communication between the port I5 and the port 23. Also, the slide valve has a passage 58 which in this last mentioned position provides communication between the ports 50 and I 9. One other passage 53 is adapted under these circumstances to provide communication between the ports 41 and 23.

The operation of the form Just described is as follows:

With the various parts in the position in -which they are illustrated in Fig. 1 it will be understood that the cylinder 2I to the left of the piston 25 will be filled with the chemical which it is desired to have mixed with the stream of iluid flowing through the conduit I. With respect to this stream of huid it will be understood that pressure from the main I will act through the conduit I3, the valve II, the conduit I4, the passageway 54 in the slide valve, the conduit 20 and the space to the right of the piston 25 within the cylinder 2|, tending to move the piston to the left. The chemical to the left of the piston will be under much the same pressure so that the unit pressures on the two sides of the piston will be equal. However, the area of cross section of the piston rod 24 will not be acted upon by the chemical under pressure, thus unbalancing the total pressures on the piston and causing it to move to the left. The chemical within the cylinder 2I to the left of the piston 25 will thus be caused to flow out through the conduit 2K2, the passage 55 and the conduit I8 into the conduit I. This ow will be controlled by the position of the needle valve I2, and this needle valve position will in turn be controlled by the amount of fluid flowing through the conduit I. and past the valve element 3. Thus. the valve element 3 will rise as the velocity of fluid in the conduit I increases. When the valve element 3 rises the valve element I2 will likewise rise and permit a greater ow through the conduit I3 and the other connected passageways. This increased flow will naturally cause a i faster travel of the piston 25 and an increased amount of chemical forced from the cylinder 2| I into the flowing stream of fluid in the conduit I.

During this travelof the piston 25 to the left any substance within the space 21 will be forced out :by the piston rod 24 and through the conduit 23, the passageway 56, and the conduit`43 to be vented to the atmosphere.

When the piston 25 reaches the extent of its movement to the left, the engagement of the valve handle 35 with the slot 34 will cause a shifting of this valve to the position illustrated in Fig. 2.

it will be noted that pressure from the conduit ed through the conduit 31, conduit 4I to the space 43 at the left-hand end thereby forcing and holding the slide valve in the position illustrated in Fig. 1. At the same time, the space at the right-hand end of the slide valve housing will have been vented through the conduit, the valve 35 and the conduit 38 which communicates with the conduit 48.

After the valve 35 has been shifted as above described by the movement of the piston 25 to the left, pressure fluid from the conduit I4 will be lead through the conduit 31 and the conduit 48 to the space within the right-hand end of the slide valve housing so as to act upon the piston 52 and tend to move the slide valve to the lett. At the same time, the space at the left end of the slide valve housing will have been vented through the conduit 4I, the valve 36 and the I4 will have been conduct` the valve 36 and the f conduits 38 and 48. The slide valve will, therefore. be immediately shifted yto its extreme leithand position as is illustrated in Fig. 2.

Referring now more particularly to Fig. 2, it will be seen that with the slide valve in the position illustrated the conduit Il will be connected through the passageways 51 and 54 and the conduit 2l to the chamber 21. Pressure iiuid from the conduit I4 will thereby be caused to act upon the left-hand end of the piston rod 24 and to tend to move the piston rod 24 and the piston 25 together with their associated parts back to the position illustrated in- Fig. 1. The shifting of the slide valve will also have connected to conduit 22 through the passageway 59 to the conduit l5 and thence to the source of chemical supply so that as the piston 25 is moved toward the right a supply oi' chemical will be drawn into the cylinder 2l in the space at the left-hand of the piston 25.

The shifting of the slide valve as above re' ferred to will also have placed the conduit 2d and the space at the right-hand of the piston 25 within the cylinder 2i in communication with the atmosphere through the passageway 5d and the conduits 413 and 6d. The piston 25 will thus be free to move to the right under the influence of the pressure admitted to the space 2. W'hen the piston 25 has been moved to its extreme righthand position the cylinder 2l. to the left of the piston 25 will have again been lled with chemical, the valve 36 will have been shifted again to the position illustrated in Fig. 1, and the cycle will be repeated.

'I'he form of the invention illustrated in Figs.

l and 2 is such that a feeding of the chemical must necessarily be interrupted for a short space of time during the time that the cylinder 2l is being relled after it has become empty. In Fig.

'3 of the drawings, however, there is illustrated a form in which no such interval of time is necessary for the vpurpose of refilling the cylinder from which the chemical is fed. y

Referring now more in detail to Fig. 3, the pipe line I is provided with a valve 2 which is similar in all respects to that previously de- Vscribed in connection with'Figs. l. and 2. The

stem I of this valve has on its lower end a needle valve I2 which is likewise similar to that on the lower end of the stem i in Figs. l and 2. This stem extends through a stuing box Ilia for a purpose to be presently described.

The conduit lBa extends directly from pipe line l to the port |541. of the slide valve housing ISa instead of passing through the valve I I as shown in Figs. 1 and 2. The conduit I8a connects the port Ila of the slide valve housing with the pipe line I at a position downstream from the connection between this pipe line and the conduit Ida.

Directly opposite the port I5ais a port I3a from which a conduit a extends to an opening through the cylinder head 50. The cylinder head 60 forms a closure for one end of a power cylinder 2la. Connected to the oppositeend of the power cylinder 2I a by means of a partition 6I is a feed cylinder 2lb, and this feed cylinder 2lb is connected to a second feed cylinder 2Ic by means of a partition 62. The second feed cylinder 2Ie is closed at its opposite end `by means of a head a. f' y A conduit 22a. extends from a port 23a in the slide valve housing directly opposite the port Ila to connect with a passage 83 in the partition 62, and'this passage leads to the space within thev feed cylinder 2lb. Another conduit 22h leads from a port 2lb in the slide valve housing adjacent to the port 23a but longitudinally spaced .therefrom and connects with a passageway 64 in the partition 52, this passageway providing communication with the interior of the feed cylinder 2Ic.

Within the power cylinder 2Ia is a separating piston 25a which is not mechanically connected to any part of themechanism but is intended merely to separate the power iiuid from the pipe line I from a body of liquid which is placed within the power cylinder 2 Ia to the left of the piston 25a. This liquid is made to fill the space within' the cylinder 2Ia to the left of the piston 25a, and also to fill the space within the valve I'ia and within the feed cylinder 2Ib to the right of the piston 25h. Passage of this body of liquid from the cylinder 2Ia to the cylinder 2lb is controlled by means of the valve IIa and the movement of the needle valve I2. This valve serves in all respects the same function as the valve Il in Figs. 1 -and 2 with the exception that it serves to control the passage of liquid instead of the passage of the uid from the pipe line I which in many instances would be gas, or which if a liquid might be corrosive so as to cause rapid deterioration of y the needle valve I2. The liquid within the cylinder 2 Ia may be of any desired characteristics but preferably one which is inert and is possessed of proper degree of viscosity so that it may be readily controlled by the needle valve I2. Also, in those cases where it is subjected to variations in temperature at frequent intervals it should be of such a nature that these variations in temperature will not seriously affect the rate at which it will iiow through the needle valve I2.

The feed pistons 25h and 25e within the feed cylinders 2lb and 2|c respectively are mounted on the opposite ends of a connecting piston rod 6l, this rod passing through the partition 62 and being sealed therein by means of a gland nut 65 bearing against a packing 66. A cap screw 68 is employed for securing the piston 25h to the right-hand end of the piston rod 61 and a second cap screw 69 is provided for securing the piston 25e to the opposite end of the piston rod 6l.' The cap screw 69 has its head tapped and threaded to receive the threaded inner end of a controlling rod 3Ia which extends through the head 26a and through the seal formed by the stuiling box 30a and has an opening 3Ia adjacent its puter end .for the purpose of receiving the handle 35 of the valve 36. It will be seen that as the piston and piston rod assembly consisting'of the pistons 25h and 25e and the piston rod` 61 moves from right to left or vice versa. it will shift the valve handle 35 and thus turn the valve 36 to one position or to the other.

The valve 35 is connected in exactly the same manner as in the previously described form of the invention, the conduit 31 connecting one port of this valve to the conduit Ila leading from the pipe line I, the conduit 38 connecting an opposite port of this valve 36 to a port 39a in the slide valve housing which port is adjacent to the port I3b, and the conduit 38 is vented through a connecting conduit 48. The conduit 48 is also connected with a short conduit 49 which'is in communicay 36 is connected by a conduit Il! tothe right-hand end oi the slide valve housing where it communii 7 cates with the interior of the chamber 42a formed by the cap 44a that is threadedly mounted on this end of the chamber. The opposite port of the valve 36 is connected by a conduit 4I to the chamber 43a at the left-hand end-of the slide valve housing. this chamber being provided by the cap 45a which is threadedly connected at this end of the housing.

A conduit 46a leads from a source of chemical supply and is connected by branches to ports 41a adjacent one side of the port 23h and to a second port Ilb adjacent the opposite side of the port 23a.

The slide valve Bla has a piston 52a mounted on one end thereof and a piston 63a mounted on the other end thereof, these pistons being disposed in the spaces 42a and 43a respectively. These pistons are so arranged that when acted upon by pressures of fluids injected through the conduits 40 or 4I as the case may be they will serve to shift the slide valve from one position to the other. The slide valve has a passageway 54a transversely thereof which when the valve is in its left-hand position as illustrated in Fig. 3 will serve to interconnect the ports I5a and ISG. A similar passageway 56a when the valve is in the same position serves to interconnect the ports I'Ia and 23a. When the valve is in this same position a passageway 56a in one surface thereof serves.to interconnect the ports Ilb and 38a and another similar passageway 66D serves to connect the ports 23h and 41a. l

When the slide valve is in its opposite position or at its extreme left-hand position as illustrated in Fig. 3, a passageway 61a combines with the passageway 54a to interconnect the ports I5a and isb. A passageway 58a at this position serves to connect ports I9a and 56a and a passage 69a serves to interconnect ports 4'Ib and 23a.

In operation, when the parts of the device shown in Fig. 3 are in a position illustrated in that gure power fluid will tend to ilow in through the conduit I4a and this power fluid exerting its,

pressure through the conduit 31, the valve 36 and the conduit 4I will act upon the piston 53a and 'force and hold the slide valve in the extreme right-hand position as illustrated. The power fluid will also be conducted through the passageway 54a. the conduit 20a and into the power cylinder Zia on the right-hand side of the piston 25a. I'his will tend to move this piston to the left, and the speed 0f its movement will depend upon the position of -the needle valve I2, this position in turn depending upon the amount of ow which is taking place through the conduit I. In this case also the unit pressures on the two sides of the piston 26h will be equal but due to the area, of cross section of the rod 61 the total pressure on this piston will be unbalanced and the piston will move to the lef As the liquid within the cylinder 2Ia is forced by the needle valve I2 into the cylinder 2lb, it moves the piston assembly 25h and 25e on the rod 61 to the left. Prior to this movement the space within the cylinder 2lb and to the left of the piston 25h will have been lled with a chemical which it is desired to feed into the pipe line I. During this movement toward the left this chemical will be forced out through the passage 63, the conduit 22a, the passage 66a and into the pipe line I. At the same time, the conduit 46a from the source of chemical supply will be connected through the port 41a, the passageway 59h, the port 2lb and the conduit 22h and the passageway 64 to the interior of the cylinder 2Ic to When the piston assembly reaches its the right of the piston 26e. Therefore as this piston 25e moves to the left it will draw into this space to the right of the piston 25o a supply of chemical which is later to be fed into the pipe line I. Fluid from' the interior of the cylinder 2Ic to the left of the piston 25c will during this procedure be forced out' through theconduit 2lb, the port I9b, the passageway 56a,.\ the port 39a and the conduit 48 to the atmospherel this venting of the space within the cylinder 2Ic making possible the left-hand movement of the entire assembly.

When the assembly has reached the left-hand extremity of its movement, the connection between the rod fia and the valve handle 36 will Serve to shift the valve 36 to its opposite position, Iin which position the -conduits 31 and 4l will be connected to each other and the conduits 38 and 4I will be connected to each other. When this shift takes place power uid will be drawn through the conduit 31 from the conduit I4a and pass through the valve 36 into the conduit 40 and discharge into the space 42a at the right-hand end of the slide valve housing. 'I'he left-hand end of the slide Valve housing will be vented through the conduit 4Ia, the valve 36. the conduit 38 and the conduit 48. The slide valve will thus be shifted immediately to its extreme lefthand position. With the slide valve in the last named position power fluid will be delivered from the conduit I4a through the port I5a, the passageway 51a and 54a, the port I9b duit 20h into the cylinder 2Ic on side of 'the piston 25e. directly upon the piston assembly including the piston 25h and 25o and the piston rod 61 and move this entire assembly toward the right. Again the unit pressures on the two sides of the piston 25e will be substantially equal, but due t0 the piston rod 61 the total pressures will be unbalanced and the piston will move to the right. This movement will be permitted by virtue of the venting of the space to the right of the piston 26a the left-hand This will tend to act within thecylinder 2 la, this venting taking place through the conduit 20a, the port I8a, the passageway 58a and the conduits 48 and 48. The speed of the movement again will depend upon the position of the needle valve I2 and this in turn will depend upon the amount of fluid flowing through the pipe line I.

As the piston assembly moves toward the right in the manner just described the chemical supply which has been drawn into the right-hand portion of the cylinder 2 Ic will be forced out through the passageway 64, the conduit 2211, the port 2lb, the passageways 55a and 55h and the conduit Ila into the pipe line I. Simultaneously a new supply of 'chemical will be drawn into the left-hand portion of the cylinder 2lb through the passageway 63, the conduit 22a, the port 23a, the passageway 59a, the port 41h and the conduit 46a. extreme right-hand position which is illustrated in Fig. 3 the valve 36 will again be shifted and the operation will be repeated.

It will be noted that in the apparatus last described there is in substance no interruption of the feeding ofl the chemical to the pipe line because when the feeding mechanism which consists of the piston assembly referredto reaches one extreme position its direction of movement is immediately reversed and onA its reverse moveinto the pipe line.

It is furthermore noted that whereas in the 2 the feeding moveand the conment is controlled by the needle valve I2 acting upon a flow of the fluid which is owing in the pipe line, that is a portion of that fluid which the fluid owing in the pipe line l is not suitable for this regulating purpose.

From the above it will be apparent that means have been provided whereby all of the objects and advantages sought by this invention have been attained.

Having described my invention, I claim:

1. In a device of the character described, a

single cylinder providing a feed reservoir, a single piston movable in said cylinder in one direction to feed a fluid from said cylinder and in another direction to refill said reservoir, means for applying ud under pressure to the opposite side of said piston from the uid to be fed to move said piston on its feeding stroke, a piston rod extending from said piston through the portion of said cylinder adapted to receive the uid to be fed, means to apply uid pressure directly and solely against the free end of said piston rod to move the piston in a direction to refill said cylinder with fluid to be fed, and means carried by said piston for changing the application of fluid pressure from said piston to said piston rod when the piston nears the end of its feeding stroke and from said piston rod to said piston when the piston nears the end of its relling stroke whereby said piston will be moved rst in one direction and then in the other.

2. In a device of the character described, having a feed reservoir, uid actuated means movable in one direction to feed a fluid from said reservoir and in another direction to refill said reservoir, means actuated by said movable means as it nears the end of its movement in each direction to cause it to move in the other direction, and control means connected with said movable means for controlling the rate of movement thereof, the combination comprising a metering valve associated with said control means, and uid ow responsive means disposed in the path of a stream of fiuid and connected to said metering valve for controlling the opening thereof in proportion to the rate of ow in said stream of fluid, whereby the rate of movement of said movable feeding means will be controlled in proportion to the rate of flow in said stream of fluid.

3. In a device of thecharacter described, a feed reservoir, kmeans movable in one direction to feed a fluid from said reservoir and in another direc tion to refill said reservoir, a slide valve adapted in one position to subject said movable feeding means to the action of a fluid under pressure to cause the movement thereof in said first direction, and simultaneously to connect said reservoir to a discharge port, and adapted in another position to vent` the pressure fluid previously applied to said movable feeding means, to connect said reservoir to a source of supply of fluid, and to apply fluid under pressure to said feeding means in the'opposite direction whereby to refill said reservoir with fluid to be fed, and means connected with said movable feeding means for causing the Y shifting of said slide valve toits opposite position as said feeding means nears each of the respective ends of its stroke a conduit for supplying an actuatlng fiud underpressure through said slide valve tosaid feeding means, a valve in said conduit. and means in a flowing stream, responsive to the rate of flow of the stream, to vary the Opening of the valve in said conduit.

4. In a device of the character described, a feed reservoir, means movable in one direction to feed a uid from said reservoir and in another direction to refill said\ reservoir, a multiple valve adapted in one position to subject said movable feeding means to the action' of a fluid under pressure to cause the movement thereof in said rst direction, and simultaneously to connect said reservoir to a point of discharge, and adapted in another position to vent the pressure fluid previously applied to said movable feeding means, to connect said reservoir to a source of supply of fluid, and to apply fiuid under pressure to said feeding means inthe opposite direction whereby to 4refill said reservoir with iiuid to be fed, and means connected with said movable feeding means for causing the shifting of said multiple valve to its opposite position as said feeding means nears each of the respective ends of its stroke a conduit for supplying an actuating fluid under pressure through said slide valve to said feeding means, a 1

valve in said conduit, and means in a flowing stream, responsive to the rate of ow of the stream, to vary the opening of the valve in said conduit.

5. In an apparatus for feeding a, fluid, a cylinder,-a piston reciprocably mounted in the cylinder, a conduit communicating with the cylinder at one end for the intake and discharge of a fluid to be fed, a conduit communicating With the cyl- `other conduit is oppositely connected and for placing the conduit of the fiuid to be fed alternately in communication with a source of fiuid to be fed and a destination for fluid to be fed, fluid actuated means for shifting said valve means, and means'actuated by the piston for controlling the supply and discharge of an actuating fluid to said actuating means for said valve means.

6. In an apparatus for feeding a fluid, a cylinder, a piston reciprocably mounted in the cylinder, a conduit communicating with'the cylinder at one end for the intake and discharge of a fluid to be fed, a conduit communicating with the cylinder at its other end for supplying and discharging an actuating fluid to displace the piston and feed the fluid contained in the'other end of the cylinder, fluid actuated means for returning the piston and drawing fluid to be fed into the cylin der, a conduit communicating with the fluid actuated means for supplying and discharging an actuating fluid, valve means shiftable for alternately placing one of the actuating uid conduits in communication with a source actuating fluid under pressure and with a reducedpressure while the other conduit is oppositely connected and for placing the conduit of the iiuid to be fed alternately in communication with a source of fluid to be fed and a destination for fluid to be fed, valve means for throttling the flow of actuating fluid to said cylinder, `and fluid flow responsive 1l means for controlling the throttling valve means.

7. In an apparatus for feeding a fluid, a cylinder. a piston reciprocably mounted in the cylinder, a conduitcgmmunicating with the cylinder at one end for the intake and discharge of a fluid to be fed, a conduit communicating with the cylinder at its other end. for supplying and discharging an actuating duid to vdisplace the piston and feed the fluid contained in the other end of the cylinder, fluid actuated means for returning the piston and drawing fluid to be fed into the cylinder, a conduit communicating with the uid ictuated means for supplying and discharging an actuating fluid, valve means shiftable for alternately placing one of the actuating fluid conduits in communication with an`actuating fluid under pressure and with a reduced pressure while the other conduit is oppositely connected and for placing the conduit of the fluid to be fed alternately in communication with a source of fluid to be fed and a destination for fluid to be fed, valve means for throttling the flow of actuating fluid, and uid flow responsive means for controlling the throttling valve means.

8. A feed device comprising a cylinder, a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of said rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder, and a single valve member operable in one position to place the conduit at one end of the cylinder in communication with a fluid under pressure, the feed fluid conduit communicating with the corresponding portion of the cylinder in communication with a destination, the conduit at the other end in communication with atmospheric pressure, and the other feed fluid conduit in communication with a source of supply.

9. A feed device comprising al cylinder, a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of vsaid rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder, valve means operable in one position to place the conduit at one end of the cylinder in communication with a fluid under pressure, the feed uid conduit communicating with the corresponding portion of the cylinder in communication with a destination, the conduit at the other end in communication with atmospheric pressure, and the other feed fluid conduit in communication with a source of supply, and a throttle valve in the conduit communicating with one end of the cylinder to control the rate of displacement of the pistons.

10. A fluid actuated motor comprising a cylinder having a port in each end, a piston reciprocable between the ends of'said cylinder, valve means alternately placing one port in communication with a fluid under pressure and an exhaust while the other port is in communication with an exhaust and the fluid under pressure respectively, a throttle valve associated with one of said ports for controlling the flow of fluid therethrough into and out of the cylinder to regulate movement of said piston. a flow conduit, and means responsive to flow of fluid through said flow conduit to increase the opening of said throttle valve as the flow of fluid through the flow conduit increases discharge of 12 and reduce the opening of the throttle valve as the tlow of fluid decreases.

11. In a device of the character described. having a feed reservoir, means movable to feedh fluid from said reservoir, fluid actuate'l means for moving said means, a source of actuating fluid under pressure, means for connecting said actuating means to said source to actuate said feeding means in its feeding movement, an adjustable control valve interposed in the connecting means between the source Vof actuating fluid and said fluid actuated means, and means including a fluid flow velocity responsive device for varying the amount of opening of said control valve in proportion to the velocity of flow of -a fluid.

12. In an apparatus for feeding a fluid, a cylinder, a piston reciprocably mounted in the cyl-'- inder. a conduit communicating with the cylinder at one end for the intake and discharge of a fluid to be fed, a conduit communicating with the cylinder at its other end for-supplying and discharging an actuating fluid to displace the piston and feed the fluid contained in the other end of the cylinder, fluid actuated means for returning the piston and drawing fluid to be fed into the cylinder, a conduit communicating with the fluid actuated means for supplying and discharging an actuating fluid, valve means shiftable for alternately placing one of the actuating fluid conduits in communication with an actuating fluid under pressure and with a, reduced pressure while the other conduit is oppositely connected and for placing the conduit of the fluid-to be fed alternately in communication with a source of fluid to be fed and a destination for fluid to be fed, fluid actuated means for shifting said valve means, means actuated by the piston for controlling the supply and an actuating fluid to said actuating means for said valve means, valve means for throttling the flow of actuating fluid, and fluid flow responsive means for controlling the throttling valve means.

13. A feed device comprising a cylinder. a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of said rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder, valve means operable in one position to place the conduit at one end of the cylinder in communication with a fluid under pressure, the feed fluid conduit communicating with the corresponding portion of the cylinder in communication with a destination. the conduit at the other end in communication with atmospheric pressure, and the other feed huid conduit in communication with a source of supply, a throttle valve in the conduit communicating with one end of the cylinder to control the rate of displacement of the pistons, and fluid flow responsive means for adjusting the degree of opening of the throttle valve.

14. A feed device comprising a cylinder, a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of said rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder. valve means operable in one position to place the conduit at one end of the cylinder in communication with a fluid under pressure,- the feed fluid conduit communicating with the corresponding i3 portion of the cylinder in communication with a destination, the conduit at the other end in communication with atmospheric pressure, and the other feed fluid conduit in communication with a source of supply, uid actuated means for shifting said valve means, and means actuated by the Piston for controlling the supply and discharge of an actuating fluid to said actuating means for said valve means.

15. A feed device comprising a cylinder, a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of said rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder, valve means operable in one position to place the conduit at one end of the cylinder in communication with a. fluid under pressure, the feed uid conduit communicating with the corresponding portion of the cylinder in communication with a destination, the conduit at the other end in communication with atmospheric pressure, and the other feed fluid conduit in communication withl a source of supply, fluid actuated means for shifting said valve means, means actuated by -the piston for controlling the supply and discharge of an actuating fiuid -to said actuating means for said valve means, and a throttle valve inthe conduit communicating with one end of the cylinder to control the rate of displacement of the pistons.

16. A feed device comprising a cylinder, a partition in the cylinder intermediate its ends dividing the cylinder into two portions, a piston rod extending through the partition, a piston carried by each end of said rod, a feed fluid conduit communicating with each portion of the cylinder adjacent the partition, an actuating fluid conduit communicating with each end of the cylinder, valve means operable in one position to Place the conduit at one end of the cylinder in communication with a fluid under pressure, the feed fluid conduit communicating with the corresponding pontion of the cylinder in communication with a destination, the conduit at the other end in communication kwith atmospheric pressure, and the other feed nuid conduit in communication with a source of supply, fluid actuated means for shifting said valve means, means actuated by .the piston for controlling the supply and discharge of an actuating fluid 'to said actuating means for said valve means, a throttle valve in the conduit communicating with one end of the cylinder to control the rate oi' displacement of the pistons, and fluid flow responsive means for adjusting the degree of opening of the throttle valve.

1'?. In an apparatus for feeding a fluid, a cylinder, a piston reciprocably mounted in the cylinder, a conduit communicating with the cylinder at one end for the intake and discharge of a fluid to be fed, a conduit communicating with the cylinder at its other end for supplying .and discharging an actuating fluid to displace the piston to feed the fluid contained in the other end of the cylinder, fluid actuated means for returning the piston and drawing fluid to be fed into the cylinder, a conduit communicating with the fluid actuated means for supplying and discharging an actuating fluid, and a slide valve comprising a casing having a port in communication with an actuating uid under pressure, a. plurality of ports one for each of said conduits and communicating therewith, exhaust ports, a port for the discharge of the fluid to be fed, a port in communication with a supply of fluid to be fed, and a valve body slidable in said casing and having ducts therein operable when the slide valve is in one position to place the actuating fluid port in communication with the pont of one of said actuating fluid conduits, to place the port of the other of said actuating fluid conduits in communication with one of said exhaust ports, to place said feed fluid conduit in communication with said feed fluid supply port and operable when in another position to oppositely connect said ports of the actuating fluid conduits and to connect the feed fluid conduit in communication with the feed fluid discharge port.

18. In an apparatus for feeding a fluid, a cylinder, a piston reciprocably mounted in the cylinder; a conduit communicating with the cylinder at one end for .the intake and discharge of a fluid tc be fed; a conduit communicating with the cylinder at its other end for supplying and discharging an actuating fluid to displace the piston to feed 4the fluid contained in the cylinder on the opposite side of the piston; fluid actuated means for returning the piston and drawing fluid to be fed into the cylinder; a conduit communicating with the fluid actuated means for supplying and discharging an actuating fluid; and a slide valve comprising a casing having separate ports communicating with an actuating pressure uid, a supply of fluid to be fed, the conduits communicating with the ends of the-cylinder. and the nuid actuated means, and having ports for exhausting spent actuating fluid and fluid to be fed: a valve body slidable in said casing; means for shifting said body to two positions; anddicts in said body operable in one position of the body within the casing to provide connections between the poi-.t for the actuating pressure fluid and the pont connectedto the cylinder on the power side of the piston, the 'actuating fluid discharge port and the piston returning means port, and the feed fluid exhaust port and the port connecd to the cylinder on the feed side of the piston; said ducts operable in the other position of the body to effect communication between the actuating fluid port and the piston returning port, the feed fluid port and the port leading to the cylinder on the feed side of the piston, and the actuating fluid exhaust port and the port leading to the cylinder on the power side of the piston.

ARTIE F. McFARLAND.

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