US1003413A

US1003413A - Valve.

Info

Publication number: US1003413A
Authority: US
Inventors: Charles R Ballard
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-03-03
Filing date: 1911-03-03
Publication date: 1911-09-19
Anticipated expiration: 1928-09-19

Description

C. R. BALLARD.

VALVE. APPLICATION FILED 111111. a, 1911.

1,003, 11 3. a n d e t. 19, 1911.

WITNESSES /9 I I INVENTOR I WW 5 v @AWW COLUMBIA PLANOGRAPH 1:0..WA5HINOTON, D. c.

CHARLES R. BALLARID, OF MIDWAY, PENNSYLVANIA.

VALVE.

Specification of Letters Patent.

Patented Sept. 19, 1911.

Application filed. March 8, 1911. Serial No. 611,968.

To all whom it may concern:

Be it known that 1, CHARLES R. BALLA'RD,

a resident of Midway, in the county of "Washington and State of Pennsylvania, have invented a new and useful Improvement in Valves, of which the following is a specification.

This invention relates to valves for compressors, pumps and the like, and more par ticularly to outlet valves therefor, although certain features thereof are applicable to inlet valves.

The object of the invention is to provide for the purposes stated a valve of simple and durable construction, one which is noiseless in its action, one in which the extent of opening can be varied, which is so constructed that it can be easily attached to and removed from the cylinder head, and which is provided with adjustably renewable means for taking up the wear.

The invention comprises a valve constructed and arranged as hereinafter described and claimed.

In the accompanying drawing Figure 1 is a longitudinal sectional view through the valve showing it attached to the cylinder head; Fig. 2 is a transverse section on the line 2-2, Fig. 1; and Fig. 3 is a central longitudinal section of a portion of the valve showing a modification of the piston and bushing.

In the drawing 1 indicates a portion of the head of a cylinder of an air compressor, pump or similar apparatus.

The valve is illustrated as an outlet valve and comprises a casing 2 which at its inner end is open to the pump or compressor cylinder and is provided with a seat 3 with which cooperates a valve 4 provided with a stem 5 which is preferably hollow as shown, and slidably mounted in an axial bore in a bushing member 6. The latter is of considerable length so as to provide along bearing for the valve stem, and has at its outer end the enlarged portion 7 which fits the outer portion of the chamber in casing 2. The bushing 6 is rotatably adjustable in the casing but is adapted to be clamped to the casing so that it cannot rotate therein, such as being provided with the external shoulder 8 contacting with an internal shoulder 9 in the casing and arranged to be clamped against said shoulder by having its outer end contacted by the inner edge of cap 10 which has a threaded connection in the outer end of the casing and which serves the two-fold purpose of clamping the bushing between its inner end and the shoulder 9 in the casing and also as a closure for the outer end of the casing.

In the valve illustrated the wear is con fined almost entirely to the reciprocation of the valve stem 5 in the bore of the bushing 6, and since these valves, whet-her used as inlet or outlet valves, are usually placed in a horizontal position, the wear is greater on the lower side of the valve stem and the bushing bore. After the wear becomes excessive it is merely necessary to remove the cap 10 and give the bushing 6 and valve a half turn, that is, through 180 degrees, and then replace the cap. This simple adjustment brings the valve and its stem back into alinement with the valve seat. When the wear again becomes excessive the worn bushing is replaced by a new one, when the valve will be practically as good as new. The bushing rotatably adjustable in the valve body provides a simple means for keeping the valve in proper working order and for renewing the wearable part at a reasonable cost, and without discarding the main parts of the valve.

The discharge orifices 11 are through the side walls of the casing.

The valve is normally held to its seat by means of a spring 12 which is interposed between the outer face of said valve and the enlarged portion 7 of the bushing, said spring being contained in the space between the casing and the reduced portion 6 of the bushing. The valve itself is provided at its peripheral edge with the out wardly projecting cylindrical sleeve or shell 13 surrounding the inner end of the spring 12 and which is of such length that it extends outwardly beyond the discharge orifices 11 and therefore prevents the fluid passing through the pump or compressor from coming into contact with the valve stem, and protecting the valve stem as well as the spring 12 from the dirt or grit in the fluid being compressed or pumped.

The cap 10 closes the outer end of the easing substantially hermetically, so that there is no tendency for the fluid being compressed to pass outwardly between the valve stem and the walls of the bore in which said stem reciprocates, so that there is a minimum amount of wear of the valve stem in the bushing on account of dirt or grit in the fluid being compressed. Moreover the sleeve or shell 18 serves as a further guide for the valve and as it has a comparatively large prevent the same from closing or opening so suddenly as to cause dlsagreeable noises. If

desired the piston may be provided with a suitable packing ring or rings, or with packing grooves, shown at 16, to give a tight fit in the dashpot chamber. The threaded connection of the piston 14 with the valve stem serves to adjust said piston on said stem and therefore determines the extent of the opening movement of the valve, it being obvious that when the/piston contacts with the inner face of the cap 10 the opening movement of the valve is stopped. In order to lock the piston in its adjusted position on the valve stem I provide a key 18, preferably threaded, and entering a tapped hole formed partly in the valve stem 5 and partly in the piston 14. If desired the piston may be provided with a small leak port 19 through which the air can pass in interchanging from one side 'of said piston to the other. The piston is preferably provided with a pair of recesses 20 for receiving a spanner wrench or the like," and the cap 10 is similarly provided with recesses 21. i

The valve casing at its inner end is externally threaded, as at 22, and is secured to the cylinder head by merely screwing the same into a tapped opening therein. Consequently thevalve can be very readily 'attached to and removed from the cylinder head without disturbing the other parts and permits of the use of a very simple cylinder head. The valve is entirely self-contained so'that in attaching it to or removing it from the cylinder head none of the parts need be disassembling. The valve can be fully completed and put together at the factory and mum amount of stoppage.

attached to the compressors in the field or elsewhere by an ordinary mechanic. On account of beingself-contained it is possible to renew valvesor compressors with a mini- Fig? 3 shows a modification in which the piston 14 is integral with the Valve stem '5", and the bushing 6 is split longitudinally '(as indicatedfby the absence of section lines on said bushing) to permit the same to be assembled with the piston and valve stem. In other particulars the construction and operation is the same as in the main form.

The valve is'of solid compact construction and is supported entirely at its inner end, thereby dispensing with the usual complicated arrangements for fastening-the valve to or in the cylinder head. The ports are so located in the sleeve, and the shell on the valve is of such length that the grit and dirt in the fluid being compressed cannot work into theaxial bore in which the valve stem slides and wear the same, and cannot come into contact with the spring and clog or foul the same. The sealing of the outer end of the valve casing prevents the fluid being compressed from seeking escape through the axial bore of the bushing and around the valve stem. The rotatably adjusted bushing provides a simple means for bringing the valve back into alinement with its seat when the bearing becomes worn, and also is an inexpensive renewable means when worn.

The main features of the valve are adapted equally well for an inlet valve as for an outlet valve, as shown in the drawing.

I do not herein claim broadly the combination of the casing provided at its inner end with the means for attachment to the cylinder heads and with ports in its side walls, a valve, a bushing rotatably adjustable in the casing and a cap closing the outer end of the casing and bearing against the bushing and clamping the latter against an internal shoulder in the casing, as shown in the drawing in this application, together with a spring arranged to hold the valve to its seat. The subject matter above stated is claimed in an application filed January 13, 1911, Serial No. 602,4;69. The valve of the present application is an improvement on the valve of the prior application in the particulars enumerated in the claims.

What I claim is:

1. A self-contained valve for compressors, pumpsand the like, comprising a one-piece casing provided at its inner end with a valve seat and with means for attachment to a cylinder head and having ports through its side walls near its inner end, said side walls being otherwise imp'erforate, said casing being internally enlarged from its outer end to provide an internal shoulder, a valve cooperating with said valve seat and provided with an outwardly extending stem and at its periphery with a sleeve or shell extending outwardly beyond the ports in the casing side walls, a bushing 'rotatably adjustable in said casing and seating against the internal shoulder therein and provided with an axial bore in which the valve stem is guided, a spring surrounded by the sleeve ing to seat said valve, and a cap threaded into the outer end of said casing and bearing directly against said bushing and clamping the same against the internal shoulder in the casing.

2. A self-contained valve for compressors, pumps and the like, comprising a one-piece casing provided at its inner end with a valve seat and with means for attachment to a cylinder head and having ports through its side walls near its inner end, said side walls being otherwise imperforate, said casing be ing internally enlarged from its outer end to provide an internal shoulder, a valve cooperating with said valve seat and provided with an outwardly extending stem and at its periphery with a sleeve or shell extending outwardly beyond the ports in the casing side walls, a bushing rotatably adjustable in said casing and seating against the internal shoulder therein and provided with an axial bore in which the valve stem is guided, a spring surrounded by the sleeve or shell on said valve and interposed between the valve and said bushing and serving to seat said valve, a cap threaded into the outer end of said casing and bearing directly against said bushing and clamping the same against the internal shoulder in the casing, the bushing and cap being formed to provide a chamber, and a piston on the outer end of the valve stem and having a close fit in said chamber and forming a dash pot therewith.

3. A valve for compressors, pumps and the like, comprising a one-piece casing provided at its inner end with a valve seat and with means for attachment to a cylinder head and having ports through its side walls said side walls being otherwise imperforate, said casing being internally enlarged from its outer end to provide an internal shoulder, a valve cooperating with said valve seat and provided with an outwardly extending stem and at its periphery with a shell or sleeve extending outwardly beyond the ports in the casing, a bushing rotatably adjustable in the casing and provided with an enlarged outer portion seating against the internal shoulder in the easing and with a reduced inwardly extending portion and being provided with an axial bore in which the valve stem is slidable, a cap threaded into the outer end of the casing and bearing directly against said bushing and clamping the same against the internal shoulder in the casing, and a spring surrounding the reduced inner portion of the bushing and bearing against the valve and being surrounded by the shell or sleeve of the valve and serving to hold the valve to its seat.

4. A valve for compressors, pumps and the like, comprising a one-piece casing provided at its inner end with a valve seat and with means for attachment to a cylinder head and having ports through its side walls, said side walls being otherwise imperforate, said casing being internally enlarged from its outer end to provide an internal shoulder, a valve cooperating with said valve seat and provided with an outwardly extending stem and at its periphery with a shell or sleeve extending outwardly beyond the ports in the casing, a bushing rotatably adjustable in the casing and provided with an enlarged outer portion seating against the internal shoulder in the casing and with a reduced inwardly extending portion and being provided with an axial bore in 'which the valve stem is slidable, a cap threaded into the outer end of the casing and bearing directly against said bushing and clamping the same against the internal shoulder in the casing, a sprin surrounding the reduced inner portion oi the bushing and bearing against the valve and being surrounded by the shell or sleeve of the valve and serving to hold the valve to its seat, the outer end of said bushing being provided with a cylindrical chamber, and a piston on the outer end of the valve stem and having a close fit in said chamber and forming a dash pot therewith.

In testimony whereof, I have hereunto set my hand.

CHARLES R. BALLARD. Witnesses:

F. W. WINTER, MARY E. CAHooN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.