Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1990-11-05
1991-09-17
Rivell, John
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
137493, F16K 1726
Patent
active
050485610
ABSTRACT:
A bidirectional check valve that includes a housing having an internal cavity with fluid openings at axially opposed ends. A first valve element comprises a cup-shaped sleeve having a base adjacent to one axial end of the cavity and a sidewall axially slidably embraced by the housing within the cavity. A first fluid passage extends through the base of the sleeve adjacent to one of the cavity openings. A second valve element comprises a spool telescopically slidably received within the sidewall of the sleeve. A second fluid passage extends through the spool end from adjacent the second end of the housing cavity to internally adjacent the sidewall of the sleeve. A fluid passage is formed between the radially opposed surfaces of the sleeve and the spool for passing fluid therethrough as a function of axial position of the sleeve and spool with respect to each other. A coil spring is captured in compression between the sleeve and the spool so as to urge the valve elements toward respective ends of the housing cavity. The fluid passage between the radially opposing surfaces of the sleeve and spool comprises at least one channel formed in the outer wall of the spool. The channel has a cross section to fluid flow that varies as a function of axial position of the valve elements with respect to each other. To restrict fluid passage at high flow rates, one or both of the housing fluid openings may comprise a damping orifice of preselected diameter.
REFERENCES:
patent: 2681074 (1954-06-01), Frentzel
patent: 2804881 (1957-09-01), Seid et al.
patent: 2951500 (1960-09-01), Hunter
patent: 2991797 (1961-07-01), Baldwin
patent: 3067770 (1962-12-01), Fancher
patent: 3131715 (1964-05-01), Sanders
patent: 4119351 (1978-10-01), Durling
Nanda Vinod K.
Taplin Lael B.
Rivell John
Vickers Incorporated
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