US2165649A - Valve - Google Patents

Description

P i Patented July 11, 1939 Jersey i.

Application Mast 30,1936, Serial No. 71,773

VALVE James G. Parsons, McKeesport, Pa., assignor to National Tube Company, a corporation of New ,1 claim (01. 251-145) I This invention relates to valves andmore particularly to an automatic air reliefvalve.

In determining the quality of material in, pipes, tubes, and cored or other hollow objects, it is customary to apply hydrostatic pressure internally. According to this method, the air within the test-piece must be completely evatuated before the air vent is closed if assurance is to be had that the test fluid is in contact with the walls. \of the cavity at all points. The prevailing practice is to cause the testing fluid (usually water under pressure), as it'fills the cavity, to force the air out through a Vent at a point in that partof the cavity uppermost and most remote from the point of admission of the test fluid. Toward the completion of the process of exhausting the air, mist and, finally, test fluid escapes at the air ve it, indicating that the air in the cavity is exhausted. The loss of this testing fluid under high pressrre should be avoided.

g It is among the objects of the present invention to effect the complete-evacuation of air from thacavity of the test-piece coincident with the filling-thereof with testing fluid, whereby the loss or waste of the latter is eliminated. The foregoing and further objects will be apparent after referring to the drawings, in :which:

accommodate an externally scrP F thimble n. This thimble l1 exr i a chamber between the wall 14 an t,he"Ph1g The wall I4 is apertured into tl as Shown at M Similarly, the w of the valve body 153, is apertured into e member/between th wall "Wand the plu 4, h by f m s a exterior vent, as showif at 3 The bore l8 of the thimhe l1 receives the extended end of th poppet valve Ill. The end of the thimble l! which isladjacent the wall 6 is recessed, as at 2|], to raceive oneend of a valve spring 2| which i rried On'the valve stem l2. The other end of the valve spring 2| contacts a valve lock 22 which is also carried on the valve stem l2.

The end of the valve body 3 which is provided with the wall 6 is externally.screw-threaded on its-end to carry an internally screw-threaded connection 25. This connection 25 provides a seat for the extremity of the valve body 3 in the form of an annular flange 26. The connection 25 also provides a central recess 28, the back wall of which is centrally apertured, as at 29. This aperture 29 is screw-threaded to receive an externally screw-threaded thimble 30'.

., A plurality of cap-screws 3| are threaded into Figure 1 is an elevation of thefilevice of thfi/ rtheback wall of the central recess 28 to provide invention.

Figure 2 is a sectional view on the line 11 Figure 4.

Figure 3 is a sectional view on the line III-418',

of Figure 4.

stops fmhe et valve l0.

-The thimbl tll ln -thehaperture 29 extends through a frusto-conical recess 32 which opens into the bell-mouthed end 33 .of the connection 1 25. A fiber gasket 35 is disposed in the frusto Figure 4 is an enlarged sectional side eleva conical recess 32 around the thimble 30, the lat- 35 tion.

. ter extending therefrom and into the bell- Referring more particularly to the drawings,

' the numeral 2 designates the tail-stock of the test machine. A cylindrical valve body 3 is internally threaded to receive one end of an externally threaded plug 4. The other end of this plug 4 is also externally threaded for engagement with the threaded bore of the tail-stock 2, whereby the valve body 3 is supported.

, The end of the valve body 3 which is opposite the tail-stock 2 is provided with a wall 6 which is centrally apertured, as at I. This wall 6 is provided with a valve seat 8 to accommodate a poppet valve [0 whose stem l2 extends through the aperture 1. The wall 6 of the valve body 3 is provided with a series of apertures l3 around the aperture 1 to enable the flow of fluids therethrough.

The valve body 3 is provided with an inner wall M, in parallelism with the wall 6, which is centrally apertured and screw-threaded" as at l6 to mouthedend 33, as shown at 36.

In operation, a tubular test-piece 38 is disposed in the bell-mouthed end 33 of the connection 25, and around the extended end 36 of the thimble 30, with its end in contact with the adjacent sideof the fiber gasket 35.

Fluid under pressure is introduced into the test-piece 38, and displaces the air therein, the latterleasging the test-piece through the bore 40 ,of-the thimble 3|]. The force exerted by the air ,escaping from the thimble 30 against the face of the poppet valve I0 is a function of its density and is not great enough to compress the valve spring 2| and consequently cannot seat the poppet valve on its 5 t 8 in the wall 6 of the valve body 3. When th air has been displaced the oncoming fluid unde1 pressure, again, because of its density, impinges on the face of the poppet valve with force sufiicient tocompress the valve spring 2| and to securelydiold the poppet valve 20 other en In on its seat 8. The test fluid is released from the test-piece 38 by way of the usual three-way valvefnot shown) through which it was admitted thereto.

5 While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of my inven- :1 tion, as defined by the following claim.

I claim: A valve comprising a valve body having an in- )7 l ternaL chamber, the end walls of said chamber being provided with aligned apertures, a poppet 15valve carried by 'said'valvebody' with its stermv standing through said aligned apertures; "the fi m of said chamber which is adjacentthe hea said poppet valve having a seat for said P ppet haust por in the aper g remote fro t head of said poppet valve, the

-cor structed and arranged to stem of said poppet valve being adapted to extend through the aligned apertures in the end walls of said chamber and through the aperture in said plug, said plug being constructed and arranged to receive one end of a valve spring, the head of said poppet valve being adapted to contact said poppet valve seat to thereby close said first named port, means carried by said valve body for venting fluids which have been passed through said exhaust port, a detachable couy, pling carried by the end of said valve body which I is adjacent the head of said poppet valve, said detachable coupling having an inlet portjn alignment with the head of said poppet valve, a re- 7 silierit spring carried by said valve body with one '1 ofv itsfjendsreceived. by-said plugj said spring being bias said poppet ve and a port within said seat, the wall of said chamber having an'e'x-' n apertured plug adjustably disposed eof the wall of said chamber which means carried bzfsaiddetachable coupling for "poppet valve from closing said inlet Dotti! c Y 'JAMIESG. PARSONS.

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