US1873318A - Self-cleaning slush pump valve - Google Patents

Description

Aug. 23, 1932.

Filed Jan. 26, 1929 Patented Aug. 23, 1932 UNITED sraras ERNEST LLOYD nnsomaa, or 'wnrrrinn, CALIFORNIA ,snnr-cnnnivilve SLUSH EUMP'VALVE Application filedJariuary 26, 1923;. Serial no. 335,202.

This invention relates to pumps, and particularly to pumps that are used for pumping water carrying sand or mud and popular- 1y called slush pumps.

operation any grit or sand which is caught between the valve disk and the seat is ground up or moved ofi of the seat by the repeated closing of the valve. This valve is also known as a'self-cleaning valve by reason of the fact that such sand or grit lodging on the seat will eventually move off of the seat, as it cannot penetrate the face of the hardened seat or the seat face of the valveclosure. Heretofore it has been customary to employ non-metallic packing for such a valve, but in practice it is found that sand and small pebbles in the water being pumped become forced into the packing and destroy it, which necessitates the frequent changing of the packing and the temporary shutting down of the pump while the packing is being renewed.

This invention may be regarded as an improvement on the slush pump valve of this type. The valve includes in itsconstruction a valve closure in the form of a disk having guide wings that extend down into the valve opening through the seat and which operate asguides in the opening and closing'movement of the valve. It has been found in practice that in the operation of these valves the sand and grit in the waterbeing pumped tends to produce erosion in the hardened valve'seat, and the object of this invention is to provide a valve of this type having'a construction which will eliminate or prevent this erosion. V 7

Further objects of the invention will appear hereinafter.

The invention consists of the novel parts or combination of parts, to be described hereinafter, all of which contribute'to produce an eflicient self-cleaning slush pump valve. A preferred embodiment of the invention is de- The invention relates particularly to the valves of such a scribed in the following specification, while the scope ofthe invention is pointed outinthe V appended claims.

In the drawing: V V Figure 1 is a vertical section taken through a slush pump valve embodying'my invention. Figure 2 is a cross-section through the valve, taken about on theline 22 of Figure 1. 4 This section shows the underside of the V valvedisk in bottom plan.

Referring more particularly to the parts in the drawing shown, 1 represents a valve-. chestformed. in the pump casing 2. The water being pumped passes through a valve opening 3 whichis formed through apump f wall 4. The valve opening is formed in aremovable ring 5, the upper portion of which projects into the valve chest, and is formed with two intersecting'conical seat faces 6 and 7 which form the valve seat: The valve closure is in the form of a"disk 8 the under face of whichis formed'with two conical seat V faces 9 and 10 which seat respectively on'seat faces? and f the'valve seat. The upper side of the disk is provided with an upwardly adjacent to the cylindrical face which consti- I tutes the edge of the opening 3.

Acoil spring 17 is provided, the upper end of which thrusts against the'under side of the valve bonnet and the lower end of which VV thrusts against the valve disk. This spring holds the valve on its seat until the pressure V AIISQS sufiiciently in the pump chamber to open the valve and, of course, operates to'return of the pump plunger.

Ithas been'found inthe practical use of valves of this type that the seat faces 6 of the valve to its seat on the recedingstroke 9 the valve. seat tend to'erode through the ac;

tion of the sandcarried in the water.

According to my invention, in order to prevent the erosion referred to above, I provide each wingat its root, that is to say, at its point of connection to thedisk 8, with a relativelysharp edge 18 which projects toward the edge of the opening 3 and extends in the same general direction as the axis of the valve. I prefer also to form a-recess 19 on the outer sideof the wing at this point,

that is to say, the edge718 commences at the point 20 (see Figure 1 and extends in an' upwardly and inwardly inclined or slightly curved line, as shown in Figure 1. The action of'theedge 18 and the recess 19 is to prevent the formation'of eddy currentsor swirls in the pumped liquid near, the outer face of the. wing, and their-presence prevents ,to a large extent the erosive effect of the sand on such a seat.

In the operation of thevalve, the guiding ofthedisk 8, by thewings is effected through the contact of thefaces 16 with the edgejof T the opening 3, but in other respects thevalve faces 6 and"? intersect. forcible grinding of sand or pebbles between operates in the usual way.

It is customary to provide the under side of thevalve disk 8 with an annular channel orgroove 21, which islocated over the.edge 22 of the valveseat where the conical seat This prevents the the valve and the seat on theedge 22 and operatesto preserve this edge intact, What I claim is:v 1. In aslush valve for a slush pump for pumping water carrying mud and sand, the combination ofa member having a valve opening with an annular hardened seat at the Opening, and a valve closure in the form of a disk having a face to come upon the. seat,

said valve closure havinga plurality of guide wings extending from the face of the disk 'into the said opening, each guide wing'having a guide face disposed toward the end. of

' the wing for engaging the edge ofthe opening to guide the valve disk, and havinga recess on its. outer side at a point adjacent the disk with a relatively sharp edge extendingin substantially the same direction as the axis of the valve at each recess, and projecting toward the edge offthe opening, said recess and edge co-operating to prevent sand in the slush from eroding the face of the valve seat. 2. In a slush valve for a slush pump for pumping Water carrying mud and sand, the combination of a valve seat in theform of a 7 ring with a substantially conical hardened seat face, and a valve closure in the form of adisk having a'substantially conical face to come uponthe. said seat face and having a plurality of guide wings extending from the inner face of the disk into the opening of the ring, each. guide wing havinga guide face.

disposed towardits end-for engaging the edge oftheIopeningto guide the valve, and having a recess on its outer sideadjacent the for pumping water carrying mud and sand,

the combination of a ring-shaped seat having two intersecting, conical, hardened seat faces so thatfthesea for the valve is of V cross secg .tion, and a valve closure in the form of a disk having conical seat faces on its under side to "seat upon the said" conical seat faces ofthe valve seat, said valve closure having a plurality of guide wings extending fronrthe inner face of the disk into the opening of the ring-shaped seat, each guide wing having a guide face at its outer end for engaging the side of the opening through the valve seat to guide the valve and having a'recess onits outer side adjacent the under side; of the disk with arelat-ively sharp edgeat-said recess located inwardly toward the axis of the valve so as to leave a space between the edge and the inner face ofthe seat, said edge projecting toward the said seat faces and ex tending in substantially the same direction as the axis of the valve, said recessand said relatively sharp edge cooperating to prevent the sand in the slush from eroding the said 7 seat faces. I a r 4. In a slush valve for a slush pump for pumping water' carrying mud and sand, the combination of a member having a valve opening with a hardened annular seat at the opening, and a valve closure in the form of a disk having a face to come upon thesseat, e

said valve closure having a plurality of guide wings extending from the face of the having a guide face disposed toward'the end of the wing forengaging the edgeof'the opening to guide the valve disk, and having disk into the said opening, each guide wing a relatively sharp edge adjacent to the disk and located inwardly toward the axis of the valve so as to leave a space between the edge and the inner face of the seat, saidedge projecting toward'the edge of the opening and extending in substantially the same direction as the axis of the valve, and operating to re ducethe elfectof erosion by sand on the-face of the valve seat at a point opposite the wing. Signed at Los Nietos, Calif, this 18th day of January,.1929.. i

ERNEST 'L oY-n nit-son,

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