US 1222579 A
Description (OCR text may contain errors)
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JAMES R. PRATT, OF BUFFALO, NEW YORK, ASS IGNOR TO LAKE ERIE MANUFACTURING CO. INC., OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.
Specification of Letters Patent.
Patented Apr. 1Q, T9 17.
Application filed July 27, 1916. Serial No. 111,735.
' To all whom it may camera:
Be it known that I, JAMES R. PRATT, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Pump i/ alves, of which the following is a specification.
This invention relates to a valve designed for hydraulic pumps and the like and more particularly to valves constructed of wood or similar relatively-inexpensive material.
One object of my invention is to produce a valve of this character which is not liable to buckle, which will seat itself accurately and reliably and which can be readily removed from and inserted in the valve cas ing for repairs or renewal.
A further object is to improve such valves with a view of simplifying their construction and reducing their cost.
In the. accompanying drawings:
Figure 1 is a sectional elevation of my improved valve andits seat. Fig. 2 is a bottom plan view of the valve and casing. Fig. 3 is a horizontal section on line 33, Fig. 1.
Similar characters of reference indicate corresponding parts throughout the several views.
1 indicates a portion of the customary partition of a pump, in which the valve seat 2 is screwed or otherwise secured, and 3 the usual hub for receiving the threaded end portion of the headed guide-stem or spindle 4.
5 indicates the valve body or casing which may be constructed of malleable iron or other suitable material. It has a depending marginal rim or flange 6 whereby a recess or chamber 7 is produced for receiving the removable valve-face 8. This valveface is preferably made of a fine-grained wood, as the same is inexpensive and will close accurately and reliably against the valve-seat. If desired, however, vulcanized fiber or other appropriate material may be used. As shown in the drawings, the valveface is of circular or disk-like form and somewhat less in diameter than that of the recess or chamber 7 to permit it to swell or expand. without buckling in the casing. In
order to prevent the valve-face from falling out of its casing on its upward or return stroke, yieldable holders or retaining means are interposed between the edge of the valve-face and the rim of the casing. In the preferred construction shown in the drawings, these holders consist of substantially semi-circular springs 9, 9, which are secured centrally to the casing by means of screws 10 and whose free ends are adapted to engage grooves 11 in the periphery of the valve-face. These grooves are arranged circumferentially in opposite sides of the valve-face and are provided with fiat bottoms or bearing surfaces 12. The retaining springs are so arranged and of such a form as to remain constantly in engagement with the valve-face under all conditions. By providing such springs or hold ers, the wooden or other fibrous valve-face is permitted to expand and contract and is yet reliably held in the valve casing, as the springs follow up the valve-face in case of shrinkage.
Arranged in the central opening 13 of the valve-face is a metallic bushing 14: which is provided at its top with a projecting flange 15 resting in a correspondinglyshaped seat in the. top of said face for holding the bushing in place during the upward movement of the valve. This bushing is loosely fitted on the guide-stem 4 and prevents the valve from binding thereon. A spring 16 may be interposed between the head of the guide-stem and the upper side of the casing 5 to assist the valve in closing promptly. If desired a washer 17 may be arranged between the spring and the upper side of the casing.
The valve-face can be readily removed for repairing or renewing it, by unscrewing the guide-stem 4 from the valve seat, spreading the retaining springs out of engagement with the grooves in the valve-face by means of a screw driver or other appropriate tool, and then withdrawing it from the guide-stem in an obvious manner.
This improved valve is eflicient and durable in operation, and its simple construction enables it to be produced at low cost.
I claim as my invention:
1. A pump valve comprising a casing provided with a depending rim, a valve-face arranged in said casing and spaced from said rim to permit expansion of the valveface relatively to the rim, and yieldable means interposed between said rim and the valve-face for removably retaining the latter in place.
2. A pump valve comprising a casing provided With a depending rim, a valve-face seated in said casing, and retaining springs secured to said rim and engaging the periphery of the valve-face.
3. A pump valve comprising a casing provided with a depending rim, a valve-face arranged in said casing and provided in its periphery With grooves, and retaining springs applied to the inner side of said rim and engaging said grooves for removably retaining the valve-face therein.
4'. A pump 'valve comprising casing provided with a depending rim, a valve-face removabl y arranged in said casing and provided in its periphery with circumferential grooves, and curved retaining springs secured between their ends to the inner side of said rim and having their end portions seated in said grooves.
5. A pump valve comprising a casing provided with a depending rim, a fibrous valve-face seated within said rim and spaced therefrom to permit expanslon of the valve-face relatively to the run, said valve-face being providedin opposite sides guide-stem rising therefrom, a pump valve mounted on said stem and comprising a casing provided with a depending rim, a fibrous valve-face seated within said rim and spaced therefrom to permit expansion of the valve-face relatively to the rim, and a bushing seated in an axial opening of the va1ve-face and surrounding said stem, said bushing being provided at its upper end with a projecting flange confined between said casing and the valve face.
JAMES R. PRATT.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,- Washington, D. G.