Valve construction

• US 3,904,169 A
• Filed: 10/19/1973
• Issued: 09/09/1975
• Est. Priority Date: 10/19/1973
• Status: Expired due to Term

• Current Assignee: Bristol Products Incorporated
• Original Assignee: Dennis W. Crawford, Larry G. Turner, Lawrence P. Cohn
• Inventors: Cohn, Lawrence P., Turner, Larry G., Crawford, Dennis W.
• Primary Examiner(s): Schwadron, Martin P.
• Assistant Examiner(s): Miller, Robert J.
• Application Number:
  US05/407,936
• Time in Patent Office: 690 Days
• Field of Search: 251/86,85,84,88,366,223 137/625.26,559,625.27
• US Class Current: 251/86
• CPC Class Codes: F16K 27/0263 multiple way valves

Abstract

A valve for use in domestic water systems wherein at least the bonnet, stem, stem-mounted closure and the hand grip can be formed of plastic material. O-rings are provided as seals and as means to retard rotation of the closure in the bonnet as the stem advances the closure toward the valve seat and retracts it from the valve seat. The closure member and stem interfit loosely and are interconnected by a snap fit of a circumferential lip in a mating groove so that the closure member has a free-floating action upon the stem and a self-seating abutment with a valve seat.

Claims

1. A valve assembly comprising a valve stem a bonnet encircling said stem and having screw threaded connection with said stem, said bonnet having an inner cylindrical bore, said stem having a reduced diameter inner end portion defining a shoulder, a cup-shaped closure member encircling said reduced stem end portion with slight clearance accommodating relative rotation of said stem and said closure member and limited rocking of said closure member on said stem, said stem having a circumferential groove adjacent said shoulder and said closure member having a circumferential internal lip at its open end seating rotatably in said groove in a snap fit, said shoulder groove and closure lip constituting circumferential interlocking components, said closure member having an end sealing surface adapted for sealing face contacting engagement with the valve seat of a valve body, a resilient seal encircling said closure member intermediate its length and frictionally engaging the cylindrical bore of said bonnet, said bonnet having an interfitting screw threaded connection with the valve body, and a resilient seal encircling said bonnet and engaging the valve body adjacently above said screw threaded connection, said bonnet including a shoulder spaced above parts of said valve body, a cover plate having marginal edges located between said bonnet shoulder and a said valve body part and being urged by said shoulder into a clamped engagement with said valve body.

2. A valve assembly as defined in claim 1, wherein each of said stem, bonnet and closure member is molded from plastic material.

3. A valve assembly as defined in claim 1, and a hand grip fitted non-rotatably upon and encircling the upper end of said stem, said stem and hand grip having interlocking parts engaging with a snap fit.

4. A valve assembly as defined in claim 1, wherein said stem and bonnet are molded from plastic material and the threads thereof are of coarse and stub character with threaded engagement between the parts being of an axial dimension approximately as great as the diameter of the stem, said threads being of the standard stub acme configuration with ten threads to the inch for each one-half inch of stem crest diameter.

5. A valve assembly as defined in claim 1, wherein said closure member is molded from plastic material and has a sealing engagement with the valve seat of the valve body.

6. A valve assembly as defined in claim 1, wherein said valve body has a frusto conical valve seat and the closure member is formed of plastic material and has a concentric frusto conical projection sealingly engageable with said valve seat.