Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1991-08-14
1992-10-27
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 635, 251144, F16K 31122
Patent
active
051582600
ABSTRACT:
A vent valve for controlling the flow of vapor to or from the head space of a storage tank for fuel or other liquids includes a valve housing scalingly mounted in an opening through the top of the tank. A vertical vapor flow passage through the housing opens at its upper end at the exterior of the tank and at its lower end into the headspace of the tank. A spring biased valve head normally closes the lower end of the vapor flow passage to seal the headspace of the tank. A detachable and disposable pneumatic motor is mounted in a downwardly convergent frusto conical seat defined within the flow passage by webs integrally formed on the housing. The motor has a motor cylinder whose exterior surface is of a frusto conical configuration complementary to the seat and is wedged downwardly into the seat by mounting screws which pass through tabs formed on the cylinder into threaded bores in the top surfaces of the webs accessible from the upper end of the passage. The wedge action provides a seal between an air flow passage through the cylinder wall and an air flow passage through one of the webs through which air under pressure may be passed to drive the motor piston and its rod downwardly against the valve head to open the valve. The motor, including the piston and rod may be molded from a suitable thermoplastic material.
REFERENCES:
patent: 4285495 (1981-08-01), King
patent: 4479507 (1984-10-01), Nichols
patent: 4721283 (1988-01-01), Wilson
Johnson Bruce R.
LeBlanc Leo J.
EBW, Inc.
Michalsky Gerald A.
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