Pipe disconnector with increased sealing power

Details Pipe disconnector with increased sealing power Pipe disconnector with increased sealing power

2006-10-10

2009-08-18

Rivell, John (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

C137S115160, C137S512200

Reexamination Certificate

active

07575016

ABSTRACT:
A system disconnector for disconnecting an upstream liquid system providing an inlet pressure from a downstream liquid system by a release valve (34) in response to a pressure drop between the systems, includes an upstream backflow preventer (40), a downstream backflow preventer (64) and a release valve body piston (18) arranged between the backflow preventers (40, 64). A pressure difference between the inlet pressure and a middle pressure between the backflow preventers (40,64) counteracts a spring (60) biasing the release valve body in the opening direction, the release valve body (18) having an effective pressurized surface (d) smaller than the surface effective for the inlet pressure. A hollow space (74) defined by the release valve body is connected to the middle pressure (66). A shiftable seat (76) provided in hollow space (74), is movable with respect to the release valve body to a fixed stop (84) upstream of the valve seat (32).

REFERENCES:
patent: 4013088 (1977-03-01), Gocke et al.
patent: 4284097 (1981-08-01), Becker et al.
patent: 5228470 (1993-07-01), Lair et al.
patent: 7059340 (2006-06-01), Hecking
patent: 20 2005 008 021 (2005-08-01), None
patent: 0 088 861 (1986-10-01), None

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