US1976464A - Pump - Google Patents

Description

1934' w. A. SHALLENBERG 1,976,464

PUMP

Filed April 1, 1955 FIG. 1 /oo Patented Oct. 9, 1934 UNITED STATES PATENT OFFICE PUMP tion of Ohio Application April 1, 1933, Serial No. 663,942 8 Claims. (Cl. 103228) This invention relates to a reciprocating pump having suction and discharge valves, and is particularly concerned with the feature of the valves. More particularly the invention provides a removable valve seat, a cooperating valve and a device which performs the double function of holding the valve seat in place and guiding the valve with reference thereto. The same device may also hold at proper tension 9. spring, which seats the valve.

My valve construction, while adapted for a variety of pumps, may be advantageously used, for example, with a pump having an open-ended cylinder in a pump chamber, one wall of which carries suction and discharge valves, so that as the piston reciprocates in the cylinder, the latter receives liquid through the suction valve and discharges it through the discharge valve. When so embodied, the pump chamber wall may conveniently comprise a horizontal deck carrying a suction valve on one side of it and a discharge valve on the other, respectively controlling suction and discharge chambers beyond the deck, and in such case a removable cover for these chambers may readily provide for the installation or removal of the valves.

The invention is illustrated herein in an embodiment which has a double acting piston and cylinder located horizontally in a pump chamber surmounted by a valve deck. Above this deck the space is divided to provide a suction chamber and a discharge chamber, each of which has two valves, and below the deck the space is divided transversely of the upper division to associate one suction valve and one discharge valve with one end of the cylinder, and the other suction valve and discharge valve with the other end of the cylinder. When so embodied, the removable cover for the respective chambers above the deck may also Iumish the desired air chamber for the discharge side of the pump.

In the drawing, Fig. 1 is a vertical section through a double-acting reciprocating pump, of the type last referred to, having a pair of my suction valves and a pair of my discharge valves, the plane of the section being taken at right angles to the axis of the cylinder and through the axis of one suction valve and one discharge valve; Fig. 2 is a horizontal section through the suction and discharge chambers above the valves, as indicated by the line 2-2 on Fig. 1; Fig. 3 is a vertical section at right angles to Fig. 1, as indicated by the line 3-3 on Fig. 2; Fig. 4 is a sectional elevation of one of the discharge valves, its seat, guide and spring; Fig. 5 is a corresponding view of one of the suction valves with its seat, guide and spring.

I will first describe the general characteristics of the pump shown in Figs. 1, 2, and 3, in order that the mounting and operation of my valves may be best understood, after which the valve construction will be specifically described. In Figs. 1, 2 and 3, 10 indicates a casing providing the pump chamber and the lower portion of the suction and discharge chambers. The lowermost portion of this casing. is formed into a horizontal cylinder 11, open at opposite ends, leaving spaces 12 and 13 within the casing beyond the cylinder ends. Extending transversely of the cylinder is a partition 14, dividing the pump chamber into two compartments connecting respectively with the opposite ends of the cylinder. Extending across the casing 10 and connected with the partition 14 is a horizontal diaphragm or deck 15, and above this is a partition 16 at right angles to the partition 14 and providing the suction and discharge chambers. The casing parts described may be made by one single casting, if desired.

The chambers above the deck 15 are shown as closed by a dome 20, which has a transverse partition 21, registering with the partition 16, this dome being held in place by a nut 31, screwing onto a stud 30, which is threaded at its lower end into a boss formed on the partition 16. The partition 21 is centrally enlarged to slidably embrace the stud 30. The dome is held in air-tight connection with the casing 10 by the nut 31, a suitable gasket 32 being interposed between the meeting faces of the dome and casing.

The suction pipe 40 connects with the suction side of the casing, being shown as threaded into a boss 1'? thereon, while the discharge pipe 41 is shown as threaded into a similar boss 18 on the opposite side of the casing.

Within the cylinder 11 is shown a suitable piston 50 on an operating piston rod 51, extending out through a stuffing box 52 mounted on a head 53, secured to the casing 10 opposite that end of the cylinder. The same bolts, indicated at 54, securing the head to the'casing may also secure both parts to a suitable frame 55 for the piston rod operating mechanism, not shown. A suitable plug 57 may close an opening in the casing 10, opposite the other end of the cylinder.

With the construction above described, if the 5 piston 50 is moved by its rod, toward the left in Fig. 3, for instance, suction is established from the suction pipe 40 through one of the suction valves S, and passageway 12 to the right-hand end of the cylinder, while the liquid under presn valve D appertaining to that end of the cylinder,

and thence to the discharge pipe 42. On the opposite stroke, the liquid enters through the other suction valve S, which is associated with the left-hand end of the cylinder, and the discharge is efiected through the other discharge valve D, associated with the right-hand end.

Double-acting reciprocating pumps having an open ended cylinder and four valves operating in general as described are well known. Frequently two of the valves have been placed below the cylinder. and two above, but with my valves I prefer to arrange them all above the cylinder on one horizontal deck 15, as that enables more ready installation and removal of the valves, as herein! after described.

It is, of course, necessary that the suction valves open toward the cylinder, and the discharge valves away from the cylinder. It is desirable that the seats for these valves be removable so that they may be replaced from time to time. It is also desirable that as simple a means as practicable be provided for holding the removable seats in place and for guiding the valves to insure their proper seating. I accomplish all of thisby providing the peculiar seat and valve arrangement illustrated in Figs. 1, 4 and 5, which I will now describe.

The valve seat, whether for the discharge valve or the suction valve comprises a disc 60, having a central orifice and a number of holes 61, spaced about the central orifice. This seat rests in a rabbet formed in the upper face of the diaphragm 15 and is held in place by engagement with it of a shoulder on a stud 70, which passes through the central orifice, and has its lower end 71 threaded into a tapped opening in the base portion of the casing 10. The lower portion of the stud 70 from the threaded end 71 to the top of the valve seat is of one diameter, while above the valve seat it has an increased diameter 72, extending axially for a considerable distance, and at the upper end of this increased diameter is a head 73, with a screw-driver slot 74. By means of this slot the stud, which has been passed through the valve seat, may be readily screwed into place when the dome 20 of the suction and discharge chambers is removed. Thus the valve seat is effectively clamped in fixed position. This is a much simpler means for holding the valve seat than by forming a thread on its periphery and it enables a more ready removal of the seat.

The stud 70 provides also the means for guiding the valve 80, which is a disc of diameter surficient to cover the seat openings 61 and provided with a central opening by which it may be slidably mounted on the stud. In the case of the discharge valve, its central opening is large enough so that it embraces the enlarged diameter 72 of the stud, and this valve is held down to its seat by a spring 90, compressed between the valve and the studhead 73. The suction valve which is similar to the discharge valve, slidably surrounds the reduced diameter of the stud 70, and is held up against its seat by a similar spring 90, compressed between the valve and a nut 95 threaded on the stud 71.

It will be seen that the seats for the suction valves and the discharge valves are identical; the studs which clamp these seats and form the guides for the valves are identical, and the seating springs are identical. Indeed, all of the valves may be exactly alike, as a larger bore in the suction valves than would snugly embrace the reduced stud diameter does no harm. The construction, therefore, not only provides for economical manufacture and assemblage, but for ready interchange of all of the parts.

The removal of the dome 20 allows access to all of the valves, and the removal of the studs removes both the valves and their-seats, enabling replacement with the greatest convenience. Moreover, either side of the casing may be coupled with a suction pipe and either side with a discharge pipe, and the valves placed accordingly. This is a great convenience in installation, as it enables the user to mount his pump as may be most satisfactory with reference to his suction and discharge piping. I

I have shown the dome 20 provided with a priming opening normally closed by a plug 100, which is intended to allow communication to the suction side of the pump. As the dome is reversible, it is changed to associate the priming opening with the other side of the casing whenever such other side carries the suction valves. The drawing also indicates suitable plugged openings for draining purposes, attaching pressure gages, etc.

It will be seen that my construction of valve is very simple and inexpensive; that the parts may be interchangeable, and that by the arrangement of the casing with the pump-chamber wall below the valve seats and with the removable cover above the seats, the valves may be very readily mounted and removed for replacement.

I claim:

1. In a pump, the combination with a pump chamber and a deck having two openings through it, a valve seat for a suction valve extending across one opening, a valve seat for a discharge valve extending across the other opening, a. pairof like studs extending through the respective valve seats and threaded into the wall of the pump chamber, each stud having a shoulder whereby the stud may clamp the valve seat in place, a valve slidably mounted on the stud beneath one of the seats, a spring beneath said valve tending to raise it against such seat, a valve slidably mounted on the other stud above the valve seat, and a spring compressed against that valve tending to lower it to its seat.

2. In a pump frame having a chamber dividing plate with a hole therein, a removable valve mechanism comprising a valve seat retained over said hole by a stud, said stud piercing said valve seat and having a shoulder cooperating with said valve seat and said stud being threadingly engaged in said pump frame on the underside of said plate to retain said valve seat as aforementioned, together with a valve slidingly retained on said stud on the underside of said valve seat and a. coil spring surrounding said guideway and bearing at one end against said valve and at the other against a retaining means removably mounted on said stud.

3. A valve assembly for mounting in a pump comprising a stud having portions of two different diameters, a valve seat surrounding the portion of less diameter and adapted to bear on the shoulder of the stud at the junction of the different diameters, a valve on the other side of the valve and spring below it may be secured in the pump by screwing the stud into a receiving open- 8 in the pump.

4. In a pump, the combination of a suction chamber, a piston and cylinder beneath the same, a passageway from the suction chamber to the cylinder including an opening through a supporting deck, a valve seat resting on an upper surface of the deck, a valve below the valve seat, a spring below the valve tending to press the same upwardly against the seat, and a stud passing through the valve seat and screwing at its lower end into the pump frame, said stud having a shoulder to hold the seat down on the deck while the portion of the stud below the seat forms a guide for the valve acting against the underside of the seat.

5. The combination of a pump casing providing a pump chamber and a deck above it, with openings through it, two like valve seats on the upper side of the deck, occupying rabbets at the edges of the deck openings, two like studs passing through the seats and anchored to the wall of the pump chamber below the seats, each stud having a shoulder engaging a seat to hold it in place and having guiding surfaces above the seat and below the seat, one stud having a sliding valve on the guiding surface above its respective seat, coacting with the seat, and a sliding valve on the other stud on its guiding surface below the seat coacting with the under side of its respective seat. 6. In a pump, the combination with a cylinder and piston and a valve deck of a suction valve unit and a discharge valve unit, each valve unit comprising a seat in the form of a disc with an opening through it, a valve disc adapted to close the openings, and a stud performing the double function of holding the valve seat in place on the deck and guiding the valve, the seats, valves and studs being respectively alike in the different units the seats being on the same side of the deck and one valve being on one side of its seat and on the upper side of said deck and the other valve being on the opposite side of said deck and hearing against the bottom of its respective seat.

WALTER A. SHALLENBERG.

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