Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Patent
1992-11-24
1994-03-08
Chambers, A. Michael
Valves and valve actuation
Fluid actuated or retarded
Flexible wall expansible chamber reciprocating valve actuator
F16K 31145
Patent
active
052921042
ABSTRACT:
A vacuum interface valve is used in a vacuum sewerage system in which sewage is transported under the influence of vacuum to a wastewater treatment station or a public main sewer. The vacuum interface valve includes a casing having an inlet, an outlet and a valve seat, a valve member which is linearly movable between a position engageable with the valve seat and a position away from the valve seat, an element for urging the valve member into engagement with the valve seat, and a vacuum device for lifting the valve member under the action of a vacuum to cause the valve member to disengage from the valve seat. The inner wall of the casing is bulged outwardly from the vicinity of the valve seat in a direction substantially perpendicular to an axis of the valve member, and a space is defined in the vicinity of the valve seat in the casing so that foreign matters are not caught between the inner wall of the casing and the valve member.
REFERENCES:
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patent: 2685426 (1954-08-01), MacGregor
patent: 4171853 (1979-10-01), Cleaver et al.
patent: 5074718 (1991-12-01), Ushitora et al.
patent: 5082238 (1992-01-01), Grooms et al.
patent: 5083885 (1992-01-01), Ushitora et al.
patent: 5100266 (1992-03-01), Ushitora et al.
patent: 5114280 (1992-05-01), Ushitora et al.
Takahashi Yoshiharu
Ushitora Akihiro
Chambers A. Michael
Ebara Corporation
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