US2095372A - Valve - Google Patents

Description

Oct. 12, 1937. J. J. SLAVIN ET AL,

VALVE Filed April 9, 1936 INVENTORS $3M BY s.

QTVLLM W W ATTORNEYS.

Patented Oct. 12, 1937 rent in VALVE John J. Slavin and Casper S. Stuckenholt, Cleveland, Ohio, assignors to The W. J. Schoenberger Company, Cleveland, Ohio, a corporation of V Ohio Application April 9, 1936, Serial No. 73,562

1 Claim. (01. 2'z732) Our invention relates to new and useful improvements in gas fixtures and has reference to gas cocks. or valves of the rotary plug type which ar-a provided with throttle screw adjustment means for accurately controlling the volume of gas flowing through the valve.

The general object of our'invention'is to provide a conveniently located inexpensive mounting f for thethrottle screw adjustment element.

: A further object of the invention is to "pro videmeans for eliminating the objectionable whistling noise heretofore caused in valves of this general type when the throttle is adjusted to re-i' duce the flow of gas to an approximate minimum. 1.5,

provide efiicient means for ieliminatingobjectionable throttle valve-vibrations.

- A still further object of the invention iscto Otherobjects and advantages will be apparent as the following description is considered with the acoompanyingdrawing, in which:

Figure 1 is a plan View of a valve embodying the invention;v .1

Figure2 is a section through the casing on the line 2-2 of Figure l, the plug valve being shown in full lines;

Figure 3 is a vertical section through the plug valve removed from the valve casing showing the throttle valve and closure members assembled;

Figure lis a side view of the throttle valve removed{ and Figure 5 is a fragmentary bottom plan view of the valve casing showing the washer in the posi- ,tion assumed when the plug valve is in full open position.

Referring more particularlyto the drawing I denotes the cast metal valve body member or casing, centrally and longitudinally bored or chambered, as at 2, to provide a substantially coneshaped seat 3 for a plug valve 4, rotatably mount ed therein. Extending at right angles to the bore 2 and in communication therewith at their inner ends, through axially alined inlet and outlet passages 5 and 6, are two extensions or branches 1 and 8 respectively. The outer end of extension I is threaded externally, as at 9, for connection with a gas manifold, not shown, and the outer end of extension 8 is threaded internally,; as at I 0,

for connection with the burner of a stove or the The plug valve 4, which is externallytapered to snugly fit and turn within the seat 3 formed in bore 2 of the casing I, has an integral extension orstem It provided with oppositely extending integral wings or handle portions I5.

Preferably the plug t has a longitudinally extending axial passage or bore I6, communicating respectively through transversely extending aligned oppositely disposed passages I1 and I8, with the inlet and outlet passages 5 and 6 in the. casing, when the valve is in open position.

Slidably but non-rotatably mounted upon the threaded lower end i9, of a reduced extension 29, depending from the plug valve i, is a washer ZI, cut away as at 22, to, provide stop shoulders 23- and 24, adapted to cooperate with a lug 25 on the end wall 23 of casing I, in limiting the movement of the plug valve. Thus, when the plug valve l has been rotated to the position shown'in Figures 1 and 2, with the wings I5 extending parallel with the extensions or branches 7 and Bythe shoulder 23 engages one end wall of stop lug 25 and halts the valve in full open position. Upon clockwise rotation of the valve approximately forty-five degrees from this position, the shoulder 24 will engage the other end wall of stop 25, and the passages I? and I8 in the plug valve will have been moved out of register with the passages 5 .and 6 in the casing, thus closing the valve. In order to prevent independent rotation of the washer with respect to the valve, the extension 20, has one or more fiat faces, and the opening 30 in the washer is correspondingly shaped,

A coil spring 2?, sleeved over the extension 20 engages with'its upper end the lower face of the washer 2i, and seats at its lower end against a nut 28, threadedly mounted on the threaded end- I9 of the extension 21?, thus forcing the washer against the end-wall 26 of the casing, and at the same time pulling the plug valve resiliently to its seat. Preferably a lock nut 29 is' employed to prevent the nut 28 from becoming accidentally unscrewed.

' It will be noted that the round stem or extension M is much larger than the conventional Valve stem and in fact is a continuation of the plug valve 4 and is of substantially the same diameter as the latter. The central longitudinally disposed bore I6 in the plug valve 4 also continues on through the stem I l, and is screw threaded from t its upper .end to a point slightly above the transverse inlet and outlet passages IT and I8, for a purpose about to be described. 7

In order to provide for a better and more accurate control of gas volume flowing through the fixture, than is had with the conventional plug valve, a throttle screw or valve 3| is threadedly mounted in the bore I6, of the plug valve 4 and its extension I l. The throttle valve 3| is formed with a threaded enlargement 32, the threads of which mesh with the screw threads of bore I6, the lower portion of the throttle screw being unthreaded and terminating in a beveled end portion 33. When the throttle valve is screwed home, this beveled end 33, seats against the correspondingly beveled bottom wall 34 of bore I6. The bottom wall 34, as will be noted from an inspection of Figures 2 and 3, is slightly below the transverse passages or openings IT and I8, thus forming a well 553 in which the lower end of the throttle valve is accommodated. While the fit of the throttle valve 3I in the bore I5 and well 50 is such as to permit of a very delicate adjustment being made, such fit is not so tight as to preclude a slight flow or seepage of gas in through passage I'I, around the unthreaded portion of the throttle and thence out through passage I8, when the plug valve is in open or partly closed position. This construction is desirable, where the fixture is provided with a pilot light connection on the outlet side of the casing, so that the pilot will be kept burning at all times when gas is being fed to the plug valve. Of course when the plug valve is turned to fully closed position with the passages I! and I8 completely out of register with the respective passages 5 and 6, the fiow of gas to both burner and pilot will be completely shut oil. A screw cap 35 closes the outer end of the bore I 6.

Experience has proven that where the end of the throttle is squared, objectional whistling was caused by the gas passing through passages I1 and I8 striking the sharp edges of the throttle screw. This whistling is obviated, and a much more uniform flow assured, by beveling the end 33 of the throttle.

Heretofore considerable trouble has been experienced with fittings of the general type disclosed herein, due to the fact that the throttle valve would frequently be affected by vibrational stresses thus causing the gas rate to vary to an objectionable degree. This objectionable vibration has been eliminated in the present invention by a small coil spring 36, which seats at its inner end against the end wall of a recess 3'! formed in threaded enlargement 32, and at its other end against the threaded wall of longitudinal passage or bore I6 of plug valve 4.

The location of throttle adjustment screw or valve 3| in the plug 4 adds practically nothing to the cost of the latter, as the only change necessary in the conventional plug is to extend the bore or passage I6. On the other hand the location of the throttle in the plug obviates the necessity of forming the customary separate chamber or housing for the throttle on the casing I, as well as changes in the plug. The extended outer hollow end or stem portion of the plug serves as a housing for the throttle valve and at the same time the former can readily be cast with the wings or handle portions I5. Furthermore, by mounting the throttle axially in the hollow plug a much better control of the rather heavy gas flow pres ent in fittings of this type, is possible.

Having thus described our invention, what we claim is:

A valve comprising a valve body having a valve seat, a plug valve rotatably confined in said seat, said valve body and plug having communicating inlet and outlet passages, said plug having a bore in axial alinement with the valve seat, a throttle JOHN J. SLAVIN. CASPER S. STUCKENHOLT.

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