Check valve assembly for pipeline system

Details Check valve assembly for pipeline system Check valve assembly for pipeline system

1986-06-16

1987-09-15

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Direct response valves

1374842, 1375122, 1375147, F16K 1503

Patent

active

046932690

ABSTRACT:
A check valve assembly of the quick shutoff type equipped with an auxiliary valve of the slow closure type, wherein the check valve assembly comprises a primary valve plate arranged within a valve housing to open and close a primary cylindrical bore in the valve housing, and a swingably pressure receiving plate secured at one end thereof to the primer valve plate to be applied with a hydraulic pressure, and wherein the auxiliary valve comprises a cylindrical valve casing mounted on a portion of the primary valve plate, the valve casing being formed with a secondary cylindrical bore and formed at the peripheral wall with a radial hole which is arranged at the down stream of the primary valve plate, a cup-shaped cylinder coupled with one end of the valve casing, a piston slidably disposed within the cylinder to form a chamber in the cylinder, flow restriction means arranged to provide a fluid communication between the chamber and the interior of the valve casing, a valve element slidably disposed within the valve casing to control the quantity of hydraulic fluid flowing through the secondary cylindrical bore and the radial port, and a valve rod arranged to interconnect the piston and the valve element and being engaged at one end thereof with the pressure receiving plate.

REFERENCES:
patent: 955043 (1910-04-01), Barr et al.
patent: 1661442 (1928-03-01), Nacey
patent: 2665877 (1954-01-01), MacGregor
patent: 2714392 (1955-08-01), Mercier
patent: 3099283 (1963-07-01), Holdeman et al.
patent: 4131142 (1978-12-01), Barr et al.
patent: 4330006 (1982-05-01), Eck et al.
"Wafer-Type Check Valves", API Standard 594, Second Edition, Dec. 1977.
"Kubota Check Valves", Catalogue Published by Kubota Tekko Kabushiki Kaisha in Japan on Jan. 3, 1978.

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