Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1980-05-02
1982-06-29
Walton, George L.
Fluid handling
Line condition change responsive valves
Direct response valves
91420, 251 634, 251 635, F16K 31122, F16K 1704
Patent
active
043368263
ABSTRACT:
A pilot-assisted pressure relief valve including a valve body 10 defining a first and second plurality of ports 30, 32 and an internal stepped bore 40 that slidably supports an elongate, tubular primary piston 34 engageable with a valve seat 36 mounted at one end of the valve body bore, which cooperate to control fluid communication between the first and second plurality of ports. The piston 34 is biased towards a flow interrupting position by a spring and is biased towards an open position by fluid pressure at the first plurality of ports. A pilot-operated piston 70 is mounted coaxially with the primary piston and is operative to engage the primary piston 34 and oppose the spring force thereby reducing the effective relief setting of the valve.
REFERENCES:
patent: 2653626 (1953-09-01), Finlayson
patent: 3665810 (1972-05-01), Parrett
patent: 3792715 (1974-02-01), Parrett et al.
patent: 4223693 (1980-09-01), Kosarzecki
Fluid Controls, Inc., "Cartridge Over Center Valves," Apr. 1979, p. 5.061; Mar. 1980, p. 5.063.
Fluid Controls Inc.
Walton George L.
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