Half profile slot valve

Details Half profile slot valve Half profile slot valve

1997-07-14

1999-03-16

Chambers, A. Michael

Valves and valve actuation

Hermetic flexible wall seal for actuator

Bellows

251 62, 251204, F16K 31122

Patent

active

058819983

ABSTRACT:
A slot valve (10) comprising a valve housing (12) defining a valve chamber (14) and having a valve gate (34) movable to seal off a central opening (30). An actuator assembly (46) includes a piston component (70, 72) and a cylinder component (60), and a pair of inner telescoping actuators (108), which define inner working chambers (120). Wear rings (124, 126, 128) engage guide surfaces that are isolated from valve chamber (14) by means of a bellows shield (90). The guide surfaces are positioned at least partially along the length of the bellows shield (90), within the second working chamber (104) of the actuator, so as to decrease the height of the actuator.

REFERENCES:
patent: 3038692 (1962-06-01), Holmes
patent: 3086745 (1963-04-01), Natho
patent: 4431159 (1984-02-01), Stubbs
patent: 5626324 (1997-05-01), Nakamura et al.
Brochure for `22000 Series, Stainless Steel Rectangular Valves,`High Vacuum Apparatus Manufacturing, Inc.: Hayward, pp. 1-6. 1996.

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