US2183538A - Expansive fluid-actuated pilot-controlled valve mechanism for motors of reciprocating pumps - Google Patents

Description

Dec. 19, 1939. BUTLER 2,183,538

EXPANSIVE FLUID-ACTUATED PILOT-CONTROLLED VALVE MECHANISM FOR MOTORS 0F RECIPROCATING PUMPS Filed Jan. 21, 1938 3 Sheets-Sheet 1 Dec. 19, 1939. F. D. BUTLER 2,183,538

EXPANSIVE FLUID-ACTUATED PILOT-CONTROLLED VALVE MECHANISM FOR MOTORS 0F RECIPROCATING PUMPS Dec. 19, 1939. F. D BUTLER 2,183,538

EXPANSIVE FLUID-ACTUATED PILOT-CONTROLLED VALVE MECHANISM FOR MOTORS 0F RHCIPROCATING PUMPS Filed Jan. 21, 1938 3 Sheets-Sheet 3 FMEMM Patented Dec. 19, 1939 UNITED STATES PATENT. OFFICE,

EXPANSIVE rwm-Acrmran ruler-conraotnan VALVE MECHANISM roa mocross or anorraocarmarunms Frank 1mm Bum}, United sum it." Application January 21,1838, Serial No. 1m-

8 Claims. (or. 121-151) (Granted under the not of March 3, 1883, as

amended Apl'll 8., 1928; 370 0.

My present invention relates to valve operating mechanisms for motors of reciprocating pumps wherein the pflot valve or valves of such a motor is mechanically operated either directly or in- 6 directly by the main piston and wherein the main valve of such motor is actuated by expansive fluid which latter is controlled by such pilot valve or valves.

The major concept of my present invention is 10 the provision of a simple, compact, efllcient, durable and relatively inexpensive valve assembly for the type of motor mentioned.

More specific concepts of my invention contemplate the following features:

The provision of a spool shaped mainvalve member which is adapted to be'slidably mounted within a cylindrical bore of a suitable valve chest located adjoining the cylinder of the motor, the main valve member to have a plurality of cylindrical shaped fluid actuating chambers for the purpose of alternately containing the expansive fluid for actuating the main valve, one being located adjoining each end thereof and both having a plurality of diameters with a seat interposed between the plurality of diameters;

The provision of a pair of valve chest bore covers, one for each end of the valve chest bore, both having suitable shoulder projections extending' inward in said valve chest bore and adapted to support said main valve centrally within said bore;

The projection of each of such covers having a plurality of diameters with a suitable shoulder seat portion interposed between such plurality of 85 diameters and corresponding to the plurality of diameters and interposed seats therebetween of the fluid actuating chambers of said main valve;

The provision of a pair of elongated cylindrical shap d pilot valve members slidably mounted parallel to the bore of the main motor cylinder, one located adjoining each end of said cylinder, both being adapted to be actuated by the main piston of the main motor cylinder and each being adapted to control the expansive fluid supply to and exhaust from the main valve fluid actuating chamber adjoining its respective end of such cylinder;

And the provision of means comprising new and useful entities which practically, commercially, efliciently and economically practice to be most advantageous in each of the foregoing, and such other respects which will more clearly appear and be understood by those skilled in this art, from the accompanying drawings and the following description, and the appended claims.

It will be readily appreciated by those skilled in this art. after understanding my invention, that various changes be made in themeans disclosed herein which will produce thesame results in substantially the same manner without di- 5 gressing substantially from my inventive concept or sacrificing any of its outstanding inherent advantages.

With reference to the drawings:

Fig. 1 is a vertical section through the embodi-v l0 ment of my pilot controlled, fluid actuated valve mechanism as applied to 'the cylinder of a pump motor;

Fig. 2 is a view in plan as takenlon the dotted line 2-2 of Fig. 1, the lower half being in plan, 16 the upper left quarter being on a plane at a level, with the, upper exhaust communication port, and the upper right quarter being on a plane parallel to theupper cylinder communication port;-

Fig. 3 is a fragmentary view of the various ele- 20 ments illustrated in Fig.1, except illustrating the main valve at mid travel position and the main piston near its uppermost end of travel and diagrammatically illustrating the main piston near its bottom end of travel and with the pilot 25 valves in the position they wouldthen occupy;

Fig. 4 is similar to Fig. 3 except illustrating the main valve at full upward travel and the main piston at the top end of its upward stroke about to recede downward in the cylinder, and 30 also diagrammatically illustrating the piston near the downward end of its travel in a position of gravel about to actuate the lower pilot valve mem- Fig. 5 is an enlarged fragmentary view of a 35 portion of the elements illustrated in Fig. 1, except that it illustrates the main piston near the downward end of its stroke or travel with the main valve and lower pilot valve at about onehalf of their downward travel; and, 40

Fig. 6 is a side elevation of my valve assembly installed in a pump assembly.

In the drawings, in which the same reference characters indicate the same parts in the several views, Fig. 6 illustrates the pump and motor as- 45 sembly with the motor cylinder I closely coupled to the pump cylinder 2 by an intermediate thimble member 3. The motor piston 4 is connected with the pump piston 5 by the main piston rod 6 and the expansive fluid actuating medium 5 is supplied to and exhausted f1 am the main motor cylinder I via the valve chez t-I secured to' the cylinder I by the stud bolts 8. v

The pump motor proper is as follows: A main cylinder body I has an internal liner or bushing 5 insert la in which is a cylindrical main bore lb closed at both ends by the upper and lower main cylinder heads 9 and 9a respectively. Installed in the bore lb is a slidable and reciprocable main piston 4 with a suitable snap type piston ring 4a. This main piston 4 is coupled to the pump piston 5 by the common piston rod 6 with a packing stufllng box in located in the lower cylinder head in. The main piston 4 is double acting in the main bore Ib due to the intermittent and alternate admittance and exhaust of the expansive fluid medium to the main bore above and below the piston 4 through the upper and lower cylinder communication ports l and Illa respectively. These ports III and I04 provide constant communication between the main bore lb and the bore Ia of the valve chest I, and are provided with the main piston cushioning ports I. and I06 respectively, which in turn maintain constant communication between said ports l0 and Illa and their respective ends of said main bore lb when the main piston 4 is at or near the ends of its reciprocating travel in such bore.

The valve chest bore In. lies in a plane parallel to and closely adjoining the main cylinder bore lb and has suitable upper and lower liners or bushing inserts lb and 1c respectively. Installed in the liners Ib and I0 is a suitable elongated spool shaped slidable and reciprocable main valve II. This main'valve ll controls the expansive fluid supply to and exhaust from said main bore lb via the upper and lower cylinder communication ports II and Illa respectively by opening intermittently and alternately to the expansive fluid supply and exhaust ports Id and le. The ports Id and le are located in the periphery of the upper and lower valve chest bore bushing inserts 1b and I0 respectively and coincide with ports l0 and Id.

The expansive fluid is supplied tothe bore Ia of the valve chest I from the source of supply. via the expansive fluid supply connection Ii secured to the external midsection of the valve chest and thence into the expansive fluid supply chest lia cored out in the central portion of the valve chest and is in constant communication with the central portion of the valve chest bore la.

The exhaust expansive fluid is expended from the valve chest bore Ia to its final destiny via the exhaust communication passageway lia which is cored in the body of the valve chest I and connects both ends of said bore Ia with the exhaust outlet connection It, which latter is secured to the mid-section of said valve chest body opposite the expansive fluid inlet connection ii.

The main valve II is provided with snap type upper and lower rings Ila and II b respectively mounted in suitable grooves located in the enlarged spool head portions thereof. These rings are machined wider than the ports Id and le in the valve chest bore liners Ib and I0 and are adapted to intermittently and simultaneously pass from one side of the ports to the other during the movement offlae valve. The outer ends of the valve chest bore Ill-are closed by suitable.

upper and lower covers 'I! and lg respectively.

These covers I! and lg are provided with suitable projections Ih and It respectively which each extend inwardly into and centrally of the valve chest bore Ia and have a slidable fit with a plurality of cylindrical recess bores located in the outer ends of the main valve l I. The upper proiection in has a plurality of diameters I7 and 'Ik with a cylindro-conical portion Im interposed therebetween which all fit and correspond to a plurality oi diameters He and lid respectively with a conical seat portion lle interposed therebetween which latter three are located in the upper end of the main valve II. The lower projection Ii has a similar plurality of diameters 17" and lit with a cylindro-conical portion 'Im' interposed therebetween which similarly all lit and correspond to a plurality of diameters lie and lid respectively, with a conical seat portion lle' interposed therebetween which latter three are located in the lower end of the main valve I l.

Suitable upper and lower actuating motor cylinders II and I if respectively for the main valve II are provided intermediate the inward ends of the projections lb and Ii and the inward ends of said recess bores in the ends of said main valve. Suitable upper and lower exhaust cushioning dash pots Hg and Hg respectively for the main valve II are provided intermediate the cylindro-conical portions Im and Im' and the larger diameters lit and lit respectively or the projections U1. and Ii.

Suitable elongated, cylindrical, shouldered upper and lower pilot valves l4 and Ma for the main valve l I are slidably mounted in suitable bushing inserts l4 and Ma respectively which are pressed into the upper and lower cylinder heads 9 and 9a respectively and which lie in a plane parallel to the main cylinder bore lb. -The inward ends of these pilot valves are smaller than the outer ends thereof and are adaptedto project into the bore lb and to each alternately be contacted by the piston 4 as the piston 4 nears the end of its stroke in the bore. The outward ends of these pilot valves have integral therewith the enlarged head portions Nb and MD with frusto conical shoulders which are adapted to close against corresponding seats 0 and He located in the outer ends of their respective bore liner inserts l4 and Ma. Outward oi. the inserts I4 and I 4a in the cylinder heads 9 and 9a respectively are mounted the externally threaded hollow plugs Nd and l4d' which form suitable pressure chambers lib and lib outward from the seats I40 and He respectively. Port communication is established between the expansive fluid supply chest lia in the central portion'of the valve chest and the pressure chambers lib and lib and the expansive fluid may flow from the chest lia through the ports lie and lie in the chest I, thence through the ports lid and lid in the upper and lower chest covers If and lg respectively, thence through the ports lie and lie in the upper and lower cylinder heads I and 9a, and thence through the ports iii and Iii in the inserts l4 and Ma and into the pressure chambers lib and lib respectively. Inasmuch as the pressure of this supply expansive fluid is always a trifle higher than the maximum pressure within the main cylinder bore lb, the pilot valves l4 and Ma are retained by this higher pressure in their full inward or normal position of travel, in which they are illustrated in Fig. 1, except when con-- tacted as illustrated in Fig. and upper portion of Fig. 4 by the main piston 4. Port communication is likewise established between the bore of the liner inserts l4 and'l4a' and the main valve actuating chambers Ill and II! respectively and between said bore of the inserts and the supply expansive fluid pressure chambers lib and lib respectively.

The expansive fluid may flow when pilot valves l4 and Ma are in their normal positions, as illustrated in Fig. 1, from said pressure chambers lib and lib through the grooves lip and lig' which latter are cut through the seats I40 and He at a point coincident with the inward ends oi ports I2! and I2! respectively, thence through the annular shaped chambers I2h and I 2h which are always in constant communication with chambers I Iband I2b' respectively whichare formed between the inner bores of the inserts ll and Ila and reduced portions of the pilot valves II and Ila at a point adjoining the inward ends of the pilot valve heads Ilb and Nb of the latter respectively, thence through the radial ports I22 and I21 in the inserts Il' and'I la respectively. thence through the ports I'M and Ili'located in the upper and lower main cylinder heads 9 and 90 respectively, and thence through the ports I2Ic and I2lc' located in the valve chest covers If and lg and extending through the projections in and Ii of the latter and into the upper and lower main valve actuating chambers IIj and III respectively. This supply communication between the pressure chambers I2b and lib and the main valve upper and lower actuating chambers I I f and II respectively is out off or terminated and exhaust communication established between the actuating chambers II f and II I and the exhaust passageway I 3a when the pilot valves Il and Ila are actuated by being contacted by the main piston l and moved outward beyond about one-third of their full outward travel similar to any one of the-positions in which they are illustrated in Fig. 5 and upper portions of Figs. 3 and 4.

When the pilot valves are in these positions of outward travel, the expended expansive fluid may flow from the actuating chambers Hi and II)" through the actuating chamber communication ports I2k and I270, thence through the continuation communication ports I 21 and I21, thence through a further continuation of the communication ports terminating in the radial ports I22 and I2i" all respectively, thence through the annular shaped exhaust chambers I31) and I3b. These chambers I3b and I3b' are always in constant communication with the exhaust passageway I3a. These chambers are formed between the inner bores of the inserts ll and Ila and reduced portions of the pilot valves I4 and Ila respectively. These reduced portions are located at a point on the valves intermediate their center non-reduced portions I le and I le and their inward end non-reduced portions Ilf and I4)" respectively. The fluid thence flows through the exhaust ports I30 and I30 extending radially through the inserts M and Ila. The flu d continues from the chambers I3b and I3b through openings I30 and I30 through the exhaust ports I3d and I3d' located in the main cylinder heads 9 and. 9a, thence through the exhaust ports I3e and I3e' located in the valve chest covers If and 19' all respectively, and into the exhaust communication passageway I 3a.

Suitable flange joint connections are made between the inward flange faces of the upper and lower valve chest covers If and lg and the upper and lower end f as respectively of the valve chest I, and als between the side faces of the upper and lower valve chest covers If and la and the side faces of the upper and lower main cylinder heads 9 and 9a respectively. These covers are secured to the valve .chestby the stud-bolts 8a, and are secured to the cylinder heads by the stud-bolts 8b, thus establishing enclosed or pipeless port communication systems extending through the covers and heads for the supply and exhaust of the actuating expansive fluid to and from the main valve actuating chambers II] and II)" via the control pilot valves I4 and Ila respectively. They also provide for passage of the supply expansive fluid from the supply chest I2a to the pressure chambers I2b and I2b' adjoining the outer ends of the control pilot valves Il and Ila respectively.

Starting with the moving elements of the motor in the position in whichthey are illustrated in Fig. 1, the operation of the motor is as follows: The space beneath the main piston 4 within the main bore Ib is in open communication with the expansive fluid supply chest I2a, and the supply expansive fluid flows from the chest I2a through the radial ports 'Ie, into the. lower cylinder communication port Ina, and thence into the space in said main bore beneath said main piston l. Simultaneowly with the expansive fluid supply entering the space beneath the piston, the space above the piston within the main bore Ib is in open communication with the expansive fluid exhaust communication passageway I3a and the expended expansive fluid above the main piston is free to flow therefrom through the upper cylinder communication port II) and the ports Id into the exhaust communication passageway I3a. The main valve control pilot valves Il and Ila in the meantime are retained in their inward,

normal positions of travel in which they are in contact with the seats Ilc and Mo respectively by the higher pressure of the expansive fluid in chambers I 2b and I2b' over that in the main cylinder bore lb.

Th s admittance of supply expansive fluid beneath the main piston and simultaneous exhaust of the expended expansive fluid above the main piston causes the piston to travel upward from the position in which it is illustrated in Fig. 1 to the positon in which it is illustrated in full lines in Fig. 3, and thence on to the position in which it is illustrated in full lines in Fig. 4. As the main piston l is thus forced upward in the bore Ib from the Fig; 1 to its position Fig. 4, the upper side of the piston contacts the inward end of the upper pilot valve I4 and forces the pilot valve upward from the position in which it is illustrated in Fig. l to the position in which it is illustrated in full lines in Fig. 3, and thence on to the position in which it'is illustrated in full lines in Fig. 4. This upward movement of the upper pilot valve I 4 causes the non-reduced center portion Ile thereof to first pass over and to thus close oif port I2i, thus closing of! supply communication between chamber I21) and the main valve upper actuating chamber'llf, and then continue on upward beyond the port I21 to thus open exhaust communication between the actuating chamber III and the upper end of the exhaust communication passageway I3a and thereby release the expended expansive fluid in the actuating chamber and allow it to flow therefrom to the passageway I3a. Ths releasing of the expansive fluid from the actuating chamber Hi to the exhaust makes it possible for the live or supply actuating fluid in the main 'valve lower actuating chamber II)" at this time formed inward of the small diameter 17" in the small bore II c to overpower the lower pressure in said upper actuating chamber II f at this time formed inward of the relatively large diameter 1k in the similar size bore lid, and thus force the main valve II from the position in which it is illustrated in Fig. 1 to the position in which it is illustrated in Fig. 3, thence to the position in and arrives at the position in which it is illustrated in Fig. 3, the lower snap ring I lb in the main valve covers the ports Ia and cuts off or terminates the supply of expansive fluid from the supply chamber lid to the space in the main bore lb beneath the main piston 4. Simultaneously the upper snap ring Na in the main valve covers the ports Id and thus terminates the expended expansive fluid release or exhaust from the space in the main bore lb above the main piston to the exhaust communication passageway l3a. As the main valve II continues its upward travel from the position in which it is illustrated in Fig. 3 to the position in which it is illustrated in Fig. 4, the lower snap ring IIb passes upward beyond the ports 1e and opens communication between the space in the main bore lb beneath the main piston 4 and the lower end of the exhaust communication passageway I3a to thereby release the expended expansive fluid beneath the main piston and allow it to flow freely therefrom through the lower cylinder communication port Inc and the ports 'Ie into the lower end of the exhaust passageway Ila.

Simultaneously with the foregoing release of the expended expansive fluid from beneath the main piston and during such continued upward travel of the main valve, the upper snap ring Ila passes upward beyond the ports Id and opens communication between the expansive fluid supply chest Ila and the space in the main bore Ib above the main piston 4 to admit live or supply expansive fluid from the chest Ila via the ports Id and Ill into the space above the main piston. Simultaneously during this continued upward travel of the main valve II from the position in Fig. 3 to the position in Fig. 4, and approximately simultaneously as the inward end of the small diameter Ii clears the outward end of the small bore He, thus temporarilyincreasing the size of the lower actuating chamber III, the small diameter I7 enters the outward end of the small bore lie and thus temporarily decreases the size of the upper actuating chamber II! and also forms an annular shaped cushioning dash-pot external to said small diameter Ii and internal to the relatively large bore lid. The exhaust expansive fluid thus trapped in this annular shaped cushioning dash-pot is finally compressed into the relatively small annular shaped dash-pot compression space My as the cylindro-conical portion Im of the projection Hz is finally contacted by the seat. I le of the main valve, thus cushioning the main valve as it nears the upward end of its travel, and eventually terminating the upward travel as the portion Im is contacted.

All communication ports and chambers through which the exhaust expansive fluid passes on being released from either of the actuating chambers III and II! are made of sufficient size so that the main piston 4 would ordinarily be caused to short stroke due to the main valve II reversing the actuating fluid supply and exupper and lower valve chest covers I! and la respectively in such a manner so that the size of the exhaust ports lie and lie can be individually, externally and manually regulated so as to adjust the stroke of the main piston during the period it is in operation.

As the main piston 4 is forced downward due to the space above said piston being supplied with expansive fluid and the space beneath the piston being open to the exhaust from the position in which it is illustrated in full lines in Fig. 4 to the position it is illustrated in dotted lines in this figure, thence to the position it is illustrated in in Fig. 5, and finally to its full downward travel position as illustrated in dotted lines in Fig. 1, the upper main valve pilot control valve I4 follows the piston downward in the early part of its travel until it is again in its normal position in contact with its shoulder seat I40. This closes of! the exhaust communication existing between the upper actuating chamber llf and the upper end of the exhaust passageway I3a via the pilot valve I4, and reestablishes expansive fluid supply communication between the supply chamber I2a and the upper actuating chamber I If via the pilot valve I4.

As the main pistoncontinues its downward stroke and nears the bottom end of its travel, it strikes or contacts the inward end of the lower pilot valve Na and causes it to be forced outward from the position it is illustrated in in Fig. 4 to the position in which it is illustrated in Fig. 5, and thence to the position it is illustrated in. the dotted lines Fig. 1, whereby the nonreduced central position Me of the pilot valve I4a first passes over port iii and cuts off or terminates the expansive fluid supply communication existing between the supply chest Ila and the lower actuating chamber III via the pilot valve Ila. It then continues its travel outward beyond the port I21, uncovers this port and establishes exhaust communication between the lower actuating chamber III, and the lower end of the exhaust passageway l3a and allows the exhaust fluid from the actuating chamber to flow freely, unless throttled by the lower exhaust control valve I31, Fig. 6, therefrom into the exhaust passageway l3a.

This release of the expansive fluid from. the relatively large lower actuating chamber II! to the exhaust makes it possible for the supply pressure of the expansive fluid in the temporarily small upper actuating chamber III to over-power the lower pressure of the exhausting expansive fluid in the temporarily large lower actuating chamber Ilf and force the main valve I l downward from the position of travel in which it is illustrated in Fig. 4 to the position of travel it isillustrated in in Fig. 5, and thence to position Fig. 1, during such downward travel of the main valve II. The upper snap ring Ila is thereby moved from above to directly over and thence below the upper port Id, which is in constant communication with the space in the main bore lb above the main piston 4, and thus first cuts off or terminates the existing expansive fluid supply from the supply chest I2a to the bore Ib and then opens or establishes exhaust communication between the port Id and the exhaust communication passageway I3a, thus releasing the expansive fluid above the piston 4 to the exhaust.

Simultaneously during this downward travel of the main valve II, the lower snap ring Ilb thereof is thereby moved from above to directly over lower port 'Ie, as illustrated in Fig. 5, and thence below the lower port 'Ie which is in conmeans cuts oi! or terminates the existing exhaust of the expended expansive fluid from the bore lb to the exhaust communication passageway Ila and then opens or establishes communication between the port la and the expansive fluid supply chest 12a, thus admitting live expansive fluid beneath the main piston 4, thereby flrst cushioning it, and then causing it to reverse its downward motion and start its upward stroke. This completes one complete double stroke cycle of operations. During this downward stroke of the main valve ii, the small diameter bore lie of the main valve passes downward over the small diameter ii and cuts oil! communication between dash-pot chamber llg' and port l2k in Ii, thus making it necessary for the main valve II to compress the remaining exhaust expansive fluid in 9', Fig. 5, into the space My, Fig. 1, and thus cushion thevalve before it contacts disc The outer ends or heads of the pilot valves l4 and Ma are machined conical so as to prevent these valves from forming a large contact with the inner sides of the hollow plugs Md and l4d' respectively, to form a seal therebetween that would cause one or the other, especially the lower, of these valves to fail to return to its normal position of travel wherein it is in contact with its shoulder'seat. The main valve II is supported solely on the projections lb and Ii and does not touch the liner inserts of the valve chamber bore. The snap rings Ila and Nb of the main valve are the valve port control means and they alone contact the inner walls of the inserts. These snap rings Ila and Ill) of the main valve II are made sufliciently wide to slightly overlap the ports 1d and 'leirespectively, as illustrated in part in Fig. .5, so as to produce both a slight supply and exhaust lap. The main piston stroke control needle valves l3 and I3! are threaded into the upper and lower valve chest covers If and lg respectively and control the size of the actuating chambers II and III exhaust ports l3e and He respectively. These needle valves may be manually operated by the hand wheels I31 and are locked in position by the jam nuts l3h. The only moving element of this motor that is externally exposed is the piston rod.

Assuming that the main piston 4 and upper and lower pilot valves l4 and Ma. respectively are in the position in which they are illustrated in Fig. 1, and that the main valve II is in the position in which it is illustrated in Fig. 4, then the main valve ll would be sustained in the position last mentioned against gravity and the pressure acting in the temporary relatively small diameter'upper actuating motor cylinder ill by the pressure acting in the temporary relatively-large diameter lower actuating motor cylinder llj' against the lower portion of valve ll.

' with reference to Figs. land 5, the exhaust cushion compression space My, Fig. 1, should be of such volumetric capacity that the exhaust expansive fluid trapped in the space llg, Fig. 5,

could not be compressed in the former mentioned space during the full downward travel of the main valve II to a pressure equal to that of the actuating-expansive fluid within chamber llf moving such valve ll downward.

It is obviously understood that this motor could be used on other appliances than a pump assembly. 1

The invention described herein may be manufactured and/or used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

Having thus set forth and disclosed the nature of the invention, what is claimed is:

1. In a motor for a pump having a cylinder containing a reciprocable piston member actuated. within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply .and exhaust or the expansive fluid to actuate the piston in the cylinder, said main valve memor said valve chest bore, and an inwardly extending projection on each cover having a slidable flt to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve membercentrally within the bore of said valve chest.

2. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control, the supply and exhaust of the expansive fluid to actuate the piston in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a frusto-conical shoulder seat interposed between two diametrical sizes, a pair of covers, one for each end of said valve chest bore, an inwardly extending projection on each cover having a slidable fit to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve member centrally within the bore oi said valve chest, and a cylindro-conical shoulder intermediate the two sizesof each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber.

3. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the suppb and exhaust of the expansive fluid to actuate the piston in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming 'the actuating motor cylinders therefor, each of of 'said valve chest, 0. cylindro-conical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber, and an annular shaped chamber adjoining the larger end of each of said disc shoulders wherein expansive fluid can be compressed to form dashpot cushioning means for said main valve chamber.

4. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply and exhaust of the expansive fluid to actuate the piston in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a frusto-conical shoulder seat interposed between the two diametrical sizes, a pair of covers, one for each end of said valve chest bore, an inwardly extending projection on each cover having a slidable flt to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve member centrally within the bore of said valve chest, a cylindro-conical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its.

mate recess in said main valve chamber, an annular shaped chamber adjoining the larger end of each of said disc shoulders wherein expansive fluid can be compressed to form dash-pot cushioning means for said main valve chamber, and port communication means extending through said inwardly extending projections through which to supply and exhaust the expansive fluid actuating medium to and from said recesses.

5. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply and exhaust of the expansive fluid to actuate the piston in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a frusto-conical shoulder seat interposed between the two diametrical sizes, a pair of covers, one for each end of said valve chest bore, an inwardly extending projection on each cover having a slidable fit to the two sizes of its mate recess in the en of said main valve chamber, said projections providing the sole supporting means for said main valve member centrally within the bore of said valve chest, a cylindroconical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber, an annular shaped chamber adjoining the larger end of each of said disc shoulders wherein expansive fluid can be compressed to form dash-pot cushioning means for said main valve chamber, port communication means extending through said inwardly extending projections through which to supply and exhaust the expansive fluid actuating medium to and from said recesses, and means in the form of a pair of cylindrically shaped pilot valves, one located adjoining each end of said cylinder, and operable by being contacted by said piston to control the expansive fluid supply to and exhaust from said recesses in said main valve member.

6. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply and exhaust of the expansive fluid to actuatethe piston in the cylinder, said main valve member having a pair of cylindrically shaped recessess, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a frusto-conical shoulder seat interposed between the two diametrical sizes, a pair of covers, one for each end of said valve chest bore, an inwardly extending projection on each cover having a slidable fit to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve member centrally within the bore of said valve chest, a cylindro-conical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber, an annular shaped chamber adjoining the larger end of each ofsaid disc shoulders wherein expansivefluid can be compressed to form dash-pot cushioning means for said main valve chamber, port communication means extending through said inwardly extending projections through which to supply and exhaust the expansive fluid actuating medium to and from said recesses, means in the form of a pair of cylindrically shaped pilot valves, one located adjoining each end of said cylinder and operable by being contacted by said piston to control the expansive fluid supply to and exhaust from said recesses in said main valve member, and means external to said valve chest for manually restricting the exhaust fluid outlet from said recesses in said main valve member and for the purpose of manually controlling both the length of stroke of said piston and the cushioning of said main valve member.

'7. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinder by expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply and exhaust of the expansive fluid to actuate the piston in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a frusto-conical shoulder seat interposed between the two diametrical sizes, a pair of covers, one for each end of said valve chest bore,

an inwardly extending projection on each cover having a slidable flt to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve member centrally within the bore of said valve chest, a cylindro-conical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber, port communication means extending through said inwardly extending projections through which to supply and exhaust the expansive fluid actuating medium to and from said recesses, means in the form of a. pair of cylindrically shaped pilot valves, and one located adjoining each end of said cylinder, operable by being contacted by said piston to control the expansive fluid supply to and exhaust from said recesses in said main valve member.

8. In a motor for a pump having a cylinder containing a reciprocable piston member actuated within the cylinderby expansive fluid, a valve chest extending parallel to and secured to the cylinder, said chest having a cylindrically shaped bore, a main valve member slidably mounted in said bore of said valve chest to control the supply and exhaust of the expansive fluid to actuate the piston'in the cylinder, said main valve member having a pair of cylindrically shaped recesses, one in each outer end thereof, said recesses forming the actuating motor cylinders therefor, each of said recesses having two diametrical sizes, a

frusto-conical shoulder seat interposed between the two diametrical sizes, a pair of covers, one for each end of said valve chest bore, an inwardly extending projection on each cover having a slidable fit to the two sizes of its mate recess in the end of said main valve member, said projections providing the sole supporting means for said main valve member centrally within the bore of said valve chest, a cylindroconical shoulder intermediate the two sizes of each projection, each of said shoulders being adapted to contact with and form a seal with its mate seat shoulder in its mate recess in said main valve chamber, port communication means extending through said inwardly extending projections through which to supply and exhaust the expansive fluid actuating medium to and from said,recesses, means in the form of a pair of cylindrically shaped pilot valves, one located adjoining each end of said cylinder and operable by being contacted by said piston to control the expansive fluid supply to and exhaust from'said recesses in said main valve member, and means external to said valve chest for manually restricting the exhaust fluid outlet from said recesses in said main valve member and for the purpose of manually controlling both the length of stroke of said piston and the cushioning of said main valve member.

FRANK DAVID BUTLER.

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