US1085013A - Blow-off valve. - Google Patents

Description

L. J. BORDO. -BLOW-0PF VALVB. APPLIoATIoN PILBD ocT. s, 1911.

Patented Jan. 20, 1914.

2 SHETS-SHEET 2.

/NVENTOR LAMBERT J. BORDO, OF EOSLYN, EENNSYLVANIA.

BLOW-OFF' VAI'VEL specification. of Letters Patent.

pplnationfilednctober 9, 1911. flerialzNo. 653,52G.

To all 'whom-it may cancer-n:

Be it knownthat I, LAMBEBKD J. Borne, a citizen of the United States of. America, residing. in Roslyn, county of Montgomery, State of Pennsylvania, have invented a oertain new and usefullmprovement in Bio-W- Ofi" Valves, of which the'followin isa true and exact description, reference being had. to the accompanying drawings, which form a.

part thereof- My present invention consists in an improved 'valve particularly' intended for use as a blow ofl' valve for locomotive and other boilers, pulp digesters and analogous devices.

The objects of the invention are to provide a valve suitable for the use-specified which is inherently strong and durable;'and simple in construction, and which is so construoted that the damage done to the valve by the erosive laction of the fiuid passing through the valve is reduoed to a practical minimum; and in which the port sealing parts of the valve may be readily and comparatively inexpensively renewed from time to time as conditions may require.

The various features of novelty which characterize my invention are'*pointed out with particularity in the claimsannexed to and forming a part of this specificationfl For a better understanding of the invention, however, and the advantages possessed by it, reference should be had to the accompanying drawings anddescriptive matter in which I have illustrated and descriloedv several forms in which my invention may be embodied.

Of the drawings, Figure 1 is a sectional elevation of a preferred form of valve constructed in accordance with the present invention, and shown inthe closed position, the section being taken on the line 1-1 of Fig. 4'. Fig. 2 is a side' or edge lelevation of the valve member proper of the valve shown in Fig. 1. Fig. 3' is a front elevationof the valve' member shown in end elevation in Fig. 2. Fig. 4 is a section through the valve casing taken o-n the line 4-4 of Fig. 1, the valve proper being shown. in full lines. Fig. 5 is a sectional eleVat-ion taken .similarl-y to Fig. 1 showing a modified form of valve casing which may be employed. Eig. 6 is a view taken similarly to Fig. 1, illustrating a valve casing modification; and Fig. 7 is a view of va portion of an angle valve having a valve c-asing` modifica-tionillustrated by TTig. 6v

In the dnawvings, and referring first to the oonstruetions shown in Figs. 1-5, the valve casin'g or body Ai shown in Figs. 1 and 4' is formedz with a valve chamber A' and inlet and outlet ports or passages A2 and A3, respectively, communicating' therewith*I The Valve casing AB' shown in Fig. 5 differs from that shown in Figs.V 1 and 2 only in that the casi'ng' body AB of Fig. 5 has the outlet pas- Sage A3 in' alinementwith the inlet passage A12 while the valve shown in Figs. 1 and 2 is an: angle valve and the inlet and out-let passages A2 amd A3' are at right 'angles to each other.. The' valve' casing proper, in each form, is open at its upper end, the opening beingnormally closed by a bonnet or cap member B'. The Valve seat proper surrounds the inlet passage A2 and is formed by an annular-member C of suitable material, such as copper, brass. or toughnon-metallic substance, such as vulcanized fiber, hard rubber cr the like, thev material' employed varying with the conditions of use. The valve seat member C is received in' a channel A* formed for the purposev 'm the valve casing.

The valve member proper, or gate, controlling the flow through the valve, is in the formof block D shown as hollow and open at its lower end but closed at'its upper ,end

except for a threadedaperturev D' receiving' the threaded portion E" of'the valve spindle E. The latter in the form shown.isv journaled. for rotative but not for axial movement in the cap or'bonnet B', and a stuifing box B' may be provided, as shown, to pre- Patented J an. 20, 1911i. w

Vent l'eakave along the spindle. The gate D is provided at its lower end with front and back depending apronsor fl'anges D3. Alined apertures D'i formed in these flanges D3 are adapted to register with the inlet passage :e12 'when the valve is open as shown in'Fig. 5. The whole gate, including the flange extensions D3, is of a length rathenmore than double the diameter of the valve seat member O. To force the gate' D` against the valve seat C in order to efl'ectually cut oif communication between the inlet passa ge A2 and the 'valve chamber A' when= the valve is closed, the valve casing has formed on its side Walls A5 inclined or Wed-ge shoulders G,

when the valve is in the closed position shown in Fig. 1. To limit the movement of the gate away from the valve seat member C, when the valve member is out of the closed position, I prefer to form on the side walls A5 of the valve casing straight shoulders F which extend parallel to the valve spindle E and coperate with corresponding Shoulders D0 on the gate D. In the preferred constructions shown in Figs. 1 to 5,

Vthe gate D is formed at each side edge with two sets of Shoulders D'? and D6 so that the gate is reversible and may have either flat side turned toward and coperating with the valve seat C.

It will be apparent without further 'explanation that in the valve construction shown in Figs. 1 5 inclusive, the gate member is readily and quickly movable from the wide open to the fully closed position by givng the spindle E a few turns in its bearing in the cap B. VVhen thegate is moved down into its seating position, the wedging provisio-ns between the valve casing and the gate insure the proper pressure of the latter against the'seat C to make a tight joint and avoid leakage, no-twithstanding the fact that the inlet pressure in the chamber A2 acts dii rectly against the gate D in a direction tending to move it away from its seat. When the valve is wide open, discharge takesplace freely. from the inlet passage A2 into the Chamber A' in the gate D through the adjacent port D3, passing from this chamber through the open lower :end of the gate, in the construction shown in Fig. 1, into the outlet passage A3, and through the alined passage D3 at the outer side of the gate into the outlet passage A30 in the construction shown in Fig. 5. The valve seat member C is engaged and held in place by the gate D when the valve is open, as well as when it is closed. The valve seat member O and the portio'n of the gate D engaging the valve seat when the valve is closed, and also the coperating guiding and wedging surfaces F and G and D5 and D6 are all out of the' .direct path of the fiow when the Valve is open, and in addition the valve seat member C and the adjacent surface of the gate D are then covered, the first by the lower portion of the gate D, the other by the adjacent side of the valve casing.

The wearing 'away or scoring of the parts directly subjected to the erosive action of the fiuid discharged in consequence does not directly interfere with the operation of the valve and the proper seating of the gate member against the valve seat. The valve seat member C may readily be reversed when the side Originally presented to the valve becomes worn or otherwise injured, and m'ay readily be replaced by another When this is necessary or desirable. The gate Dean also be readily reversed when the side originally engaging the valve seat and G. While with my vimproved construction it! is, in general, immaterial whether the inlet becomes worn away, and the gate member is inherently .relatively inexpensive in construction, thus involving a comparatively low cost of renewal, when renewal becomes desirable. The formation of the wedging and guide surfaces on the wall of the valve casing at the opposite sides of the valve seat not only removes these surfaces from the direct path of the fluid discharged but gives an inherently' Stronger construction than would be had if the gate were wedged to its seat, for instance, by engagement of wedging surfaces formed on the front side of the gate and the adjacent side of the valve casing. The outer casing wall A6 forms a barrier reducing the liabilit-y of injury in case the gate proper breaks in two, or breaks loose from its guiding and wedging engagement with the sides of the valve casing. The internal machining of the valve casing required is very slight, since it consists only in boring out the channel AAi with a suitable boring bar or like device, and the planing of the guiding and wedging surfaces F and Outlet passages of the valvecasing are alined as shown in Fig. 5 or are at angle as shown in Fig.O 1, it is to be observed that the conditions of use frequently 'make the latter arrangement desirable, and that insofar as I am aw'are, the combination herein disclosed is the first practically operative angle blow oifgate valve for use under the eX- tremely severe conditions to which blow off valves are frequently subjected. w

In many cases I consider it desirable to form the valve casing body as shown in F igs. 6 and 7, with the portion A7 of the valve casing' surrounding the inlet passage and supporting the valve seat member C, 'separable from the remainder of the valve casing body connected thei'cto, as by means of the threaded joint A3. By dividing the Valve casing body in this manner I facilitate and simplify the formation of the channel A* receiving the valve'seat member C, particularly in valves of the smaller sizes. This construction also makes it posslble to fit into similar valve casing bodies, parts A7 made in a variety of forms, with respect to the provisions for connecting the lnlet side 'of/the valve casing to the boiler, dlgester or the like device with which it. is to be employed. This reduces the quantity of material necessarily or desirably kept in stock.

' While in accordance with the provisions of the statutes I have 'illu'strated and described the best forms of my invention now known to me, it will be apparent to those skilled in the art that changes may be made 1n the form of the a aratus disclosed without departing fromliilie spirit of my invention, and that under certain conditions certain features of the invention may be used with advantage' without w cnrresponding use of other features.

Having now described my invention what I claim as new and desire to secure by Letters Patent, i's:

1. In a valvev of the kind described, the combination of a body member formed with a port and with a valve seat at one end of, and surrounding said port, and with guide surfaces at opposite sides of said port, and a reversible valve member slidingly movable transversely to said seat to open and`close said port, said valve member having two opposed faces either of which may be turned toward said seat and having two sets of guide surfaces, of which one or the other set, depending on which valve face is turned to- Ward said seat, engage the guide surfaces of the casing body to draw' said valve against said seat with a wedging action as the valve member is moved into position to close said port.

2. In a valve of the kind described, the combination of a body member formed with a port and with a valve seat at one end of, and surrounding said port and guide surfaces at opposite sides of said port., and .a reversible member slidingly movable transversely to said seat for opening and closing said port, said valve member having two opposed faces either of which may be turned toward said seat and having two sets of guide surfaees of which one or the other set, depending on which valve face is turned toward said seat, engage the guide surfaces of the casing body to draw said valve against said seat with a wedging action when the valve member is moved into position to close said port, and said valve member having two extensions, one for each face, for covering said seat, when the valve member is moved into position to open said port, said extensions being spaced apart and each being formed with an aperture registering with said port when the latter isO open.

3. In a valve of the kind described, the combination with a casing body formed with a valve chamber and with inlet and outlet ports opening to said ehamber at an angle to each other and provided with a valve seat surrounding the inner end of said inlet port and with guide surfaces at opposite sides of said port, of a reversible valve member located in said valve Chamber and slidingly movable transversely to said seat to op'en and close said inlet port, said valve member having two opposed faces either of which may be turned toward said seat and having two sets of guide surfaces of which one or the other set, depending on which Valve face is turned toward said seat, eng-age the guide surfaces of the casing body to draw said valve against said seat'with a wedging action when the valve member is moved into position to close said port, said valve member being formed with an opening extending into it between said faces at the end of the member ad'jacent the Outlet passage and'being formed with ports leading from said space, one to each of said faces, and adapted to register with the fir'st mentioned port when the valve member is moved into position to open the latter.

4:. As an article of manufacture, a reversible valve gate having two opposed valve seat engaging faces and formed at each of an opposedipair of edges with two guide surfaces one inclined to one and theother to the second of said faces.

5. As an article of m'anufacturc, a reversible valve gate having two opposed valve seat engaging faces and formed at each of an opposed pair of edges with two opposed guide surfaces one inclined to one and the other to the second of said valve faces and with two opposed guide surfaces one parallel to one and the other parallel to the second of said valve faces.

6. As an article of manufacture, a reversible valve gate having two opposed valve seat engaging faces and having a space opening into it between said faces from one end of the gate and having ports opening from said space one to each of said faces and having wedging guide surfaces formed at 1ts opposite side edges.

LAMBERT J. BORDO. VVitnesses:

ARNOLD ,KA'rz, D. S'rEwAR'r.

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