Fluid handling – Systems – Sequentially closing and opening alternately seating flow...
Patent
1980-11-05
1982-05-25
Nilson, Robert G.
Fluid handling
Systems
Sequentially closing and opening alternately seating flow...
137 85, 13759618, 251 634, G05D 1610
Patent
active
043311792
ABSTRACT:
A valve (10) is interconnected in a flow line to control the downstream pressure by means of a relatively low pressure control device such as a block and bleed valve coupled to a control port (28). An activating piston (54) is moveable within a piston chamber (32) for activating a ball valve (44) to interconnect an outlet port (22) with an inlet port (20). In a manual reset mode, a pressurized fluid at a reset port (26) enters a regulator chamber (38). From the regulator chamber (38), the fluid flows through a passage between an annulus (42) and an extension tube (62) into the piston chamber (32) and acts against the activating piston (54). As fluid enters the piston chamber (32), the pressure acting against the activating piston (54) increases and moves the piston upward to activate the ball valve (44). A sealing surface (90) on a regulator piston (86) in the regulator chamber (38) prevents flow between the regulator chamber and the piston chamber (32) if the activating piston (54) moves upward to a position activating the ball valve (44), thereby limiting the pressure acting on the activating piston. A spring (64) urges the activating piston downward, deactivating ball valve (44) when the control port (28) is open for fluid flow. In the automatic mode, the inlet port (20) and the reset port (26) are interconnected so that a continuous predetermined pressure will exist in the regulator chamber (38) and the valve (10) will be automatically reset.
REFERENCES:
patent: 2756724 (1956-07-01), Stewart
patent: 3584652 (1971-06-01), Huntington
patent: 3621871 (1971-11-01), Fisher
patent: 3770019 (1973-11-01), Stelzer
patent: 3944294 (1976-03-01), Masuda
patent: 4106510 (1978-08-01), Hakim
Nilson Robert G.
Span Instruments, Inc.
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