US 4,644,972 AGranted

Floating seal valve assembly

AssigneePrecision Plumbing Products, Inc.

InventorCharles H. Perrott

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Abstract

A valve assembly for the control of pressurized fluids. The assembly comprises a casing housing a valve chamber with communicating inlet and outlet ports. A valve seat and valve-operating subassembly is associated with one of the ports. The valve-operating subassembly comprises a valve body threaded into the casing adjacent the valve seat. The valve body has an axial bore which receives a headed shaft having a seal washer mounted on its head in separable engagement with the valve seat. Resilient means, e.g. a coil spring, urges the washer in the direction of engagement with the valve seat with a force less than the force of the pressurized fluid introduced into the chamber. The shaft and/or seal washer preferably are mounted for free rotation to minimize scuffing of the washer during operation of the valve. The casing preferably comprises a manifold having two or more outlet ports with a valve-operating subassembly associated with at least one of them to prevent contamination of fluid discharged therethrough with foreign materials inadvertently introduced into the valve chamber.

Claims3

Dependent claims

A floating seal valve assembly, comprising:

(a) a casing housing a valve chamber,
(b) a normally pressurized fluid inlet communicating with the chamber,
(c) a first outlet in the casing communicating with the chamber,
(d) a first valve seat in the casing associated with the first outlet,
(e) a first valve body in the chamber movable toward and away from the first valve seat,
(f) a first valve seal on the first valve body movable with and relative to the latter toward and away from the first valve seat to open and close the first outlet,
(g) a second outlet in the casing communicating with the chamber,
(h) a second valve seat in the casing associated with the second outlet,
(i) a second valve body in the chamber movable toward and away from the second valve seat,
(j) a second valve seal on the second valve body movable with and relative to the latter toward and away from the second valve seat to open and close the second outlet, and
(k) resilient means interengaging each seal and its associated valve body and operable to exert a seat-closing force on the associated seal which is less than the seat-opening force on said seal exerted by the normal inlet fluid pressure at the inlet to the chamber, whereby to prevent back flow of fluid from the associated outlet to the chamber upon reduction of said normal inlet fluid pressure to a force below the seat-closing force of the resilient means.

8 more elements

Dependencies are inferred from the claim text.