US1441662A - Check valve - Google Patents

Description

Jan. 9, 192 3,

J. P. CONLIN.

QHECK VALVE.

1& Q INVENTOR ATTORNEY Jam, 9, 119.23,

1. P. comm. gcHEcK VALVE. FILED APR. 25 1919- 2 SHEETS-SHEET 2.

INVENTOR [iv/9 (ZMA'N fig, ATTORNEY Patented Jan. 9, 1923.

' *1 STATES JOHNP. CONLIN, OF BROOKLYN, NEW YORK.

CHECK VALVE.

Application filed April 25, 1919. Serial No. 292,701.

17 0 allwkom it may concern:

Be it known that 1, JOHN P. CON-LrN, a citizen of the United States, and a resident of Brooklyn, county of Kings, city and State of New York, have invented new and use- 'for operation at high speeds: which allows a large port opening with a small movement of the valve element which will wear for a long period, and which does not require lubrication.

A further object of the invention is to provide a valve of this character WlllCh 1s self-grinding, whereby the valve element continues to make a tight closure against its seat until so worn as to no longer have the structural strength required to hold pressures against it. D

A further object of the invention is to provide a valve of this character which embodies but few parts and which is designed to permit ready replacement of the movable valve elements without special tools or grlnding of the parts together.

Another advantage of the valve consists in the provision of a novel form of spring and valve element so designed that should either part break, the broken part cannot escape from the valve and drop into the cylinder. Also, the valve is of symmetrical exterior construction so that any valve may be used as either a suction or discharge valve by simply reversing the valve itself.

Further advantages of my improved valve will appear from the following specification wherein I have described a preferred embodiment thereof which is especially adapted for use in ammonia compressors for ice-making machines, but which may of course be used wherever a check valve is necessary. a

In the drawings, Fig. 1 shows my improved valve in cross section with the parts assembled ready for insertion in the machine in which it is to be used;

Fig. 2 is a plan view looking in the direction of the arrow, Fig. 1, showing the several parts of the valve broken away;

Figs. 3 and 4 are respectively! plan views of the two main parts of the valve showing the1 faces opposite to those shown in Fig. 2; an

Fig. 5 shows in cross section an ammonia compressor of typical design equipped with my improved valves.

Referring to the drawings, 1 indicates one half of the valve which may be termed the body thereof which, as here shown, comprises a plate of steel, cast iron or other suitable metal having a central hole 2 for the clamping bolt 3 by means of which the valve parts are secured together.

The inner face of the plate 1 is provided with a recess or countersink 4 which is surrounded by an annular flange 5 formingone edge of the valve seat for the inner valve ring 6. The valve ring 6 is preferably formed of medium hard steel and consists merely of a flat ring of a width sufficient to cover th inner annular valve port 7 with its inner edge seated against the flange 5 and its outer edge against a similar flange 8 surrounding the annular port.

The valve may consist of a single ring but I prefer to employ two or more rings as shown, the outer ring being concentric with the inner ring and covering a similar annular port 10 concentric with the port 7. The face of the valve body' 1 is turned down around the outer valve seat as shown at 11 and the face of the'disk is also provided with a groove 12 between the flange 8 and the inner valve seat of the outer ring whereby the edges of the rings'projectbeyond the edges of the flanges forming their valve seats for the purpose which will be presently described.

. The two annular ports 7 and 10 are bridged at intervals by webs 13 of ample width to maintain the disk against distortion under the strains to which it is to be subjected, and the valve ports" are prefer-' ably flared toward the outer face of the disk to permit an easy flow of the fluid.

The valve rings are held against their seats by springs 13 which are preferably of the type shown, that is, he springs are coiled in a spiral after the manner of a watch spring with the inner or small end thrust axially out of the plane ofthe larger end. 1 preferably employ three such springs for each ring, the springsbeing set in recesses 14 bored inthe face .of the valve cap 15 which is also formed of a disk of metal of the same diameter as the valve body 1.

The holes inthe' valve cap are of the same diameter as the large end of the valve springs, whereby the valve springs fit snugly in the holes and are maintained in place without interfering with their action.

Between the recesses in which the springs are located the cap is provided with a series of arcuate ports 16 for; the discharge of fluid drawn through the valve, the ports being as large as consistent with the desired ri idity of-the structure.-

0 allow free movement of the valves the face of the valve cap adjacent the rings is formed with an annular recess of sufficient depth to-allow the desired opening of the valves which need not, in a valve such as shown, be of a greater extent than indicated in the drawing. At the outer edge of the annular recess there is a flange 17, and at the center of the disk there is a hub 18, the faces of the flange 17 and hub 18 being machined or ground to fit against the machined or ground surfaces of the part 1 to thereby form an air-tight closure between the two parts .without packing. when they are clamped together by means of the center bolt 3.

The same valve structure is designed to be used as either a. suction or discharge valve by simply reversing the bolt 3 so as to have the nut on the outside, to which end both the valve cap and valve body are turned downv around their outer edges to provide similar shoulders 19 so as to fit the same cylinder opening in either position. In Figs. 1 and 2 of the drawings I have shown the valve arranged for use as a discharge valve, that is, the head of the bolt is on the side of the body 1 of the valve.

This feature of the valve is shown in Fig. 5 which shows the cylinder 20 of a typical compressor with suction valves 21 on its ;upper side and discharge v'alves 22 on the lower side; the suction valves having the caps 15 turned toward the interior of the cylinder while the discharge valves have the.

' a with eitherof said parts facing the cylinvalve'bodies 1 on .the inside. I

The parts may be bolted together in suitable manner,-,so long "as .thebolt does .not project beyond the valve at 'one end. In the arrangement showii, the bolt 3 which has no head is first screwed into the part which is to-be on the inside (the body'l in Fig. 1)

until its end projects into the conical recess 24 on its outer face, and the end riveted down into the recesses shown. After the springs and valve rings are arranged in place .the cap 15 will be assembled in place on the bolt'and the locking nut put on the outer end of the bolt;- With this constructionthere is little likelihood .of.the.-bolt will not'pass through the port into the vention in detail, but it is of course to be loosening and dropping into the path of the piston.

In this connection it will also be noted that the springs 13are of larger diameter than the width of the annular ports in the valve body so that should the ring break or be wornthrough out of the springs, the spring cylinder.

It will be noted that the valve rings have a certain limited play on their seats, due to the lateral flexibility of the springs, and this lateral movement permits the valve rings to creep on their seats, due to the vibration of the parts when the compressor is in operation, with the result that the valve is virtually self-grinding, the marginal edges of the rings maintaining a true surface and a gas-tight joint against the valve sea-ts until worn out.

Another important feature of my improved valve is'the arrangement of the three annular ports in the valve cap in staggered relation to the two ports in the valve body, whereby the ribs or webs between the valve ports and the cap lie opposite the centers of of the rings so that whenthe valve opens the rings are drawn back against these ribs which uniformly reinforce them and prevent warping, even with very thin rings. Due to the valve construction a small movement of the rings"gi ve's a full port opening. The small movement of the ring permits very rapid operation practically without noise" and without excessive compression of the springs.

In the foregoing specification I have described the preferred embodiment of my in- 10 understood that the invention is not limited to such details except in so far as recited in the appended claims.

I claim:

A valve of the class described comprising two parts, shoulders on said parts for retaining the valve in the cylinder opening der, a plurality of concentric annular ports 'in said parts, a plurality of separate, flat April, 1919.

JOHN P. CONLIN.

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