Valves and valve actuation – Tube compressors – Perpendicularly reciprocating tube contacting element
Patent
1997-08-28
1998-09-22
Ferensic, Denise L.
Valves and valve actuation
Tube compressors
Perpendicularly reciprocating tube contacting element
25112909, 2511291, F16K 704
Patent
active
058103244
ABSTRACT:
A flow regulator, suitable for use in a respirator/ventilator, has a conduit through which a medium flows whose flow is to be regulated and a choke valve arranged outside the conduit. The choke valve includes a first solenoid, a pressure actuator that is moved by the shaft end of the first solenoid, and a fixed element with the conduit disposed between the pressure actuator and the fixed element. Actuation of the first solenoid displaces the pressure actuator so as to alter the cross-section of the conduit. The shaft of the first solenoid exhibits an effective stroke length so that the pressure actuator, in a first limit position, leaves the flow cross-section of the conduit unaltered and, in a second limit position, partially compresses the conduit against the detent. The flow regulator is made lightweight and inexpensive and also has a comparatively low power consumption by using a second solenoid having a shaft which exhibits a short effective stroke length compared to the shaft of the first solenoid. In the end position shaft of the second solenoid exerts a pressure against the pressure actuator so as to compress the conduit further than the compression produced by the first solenoid and thereby to entirely suppress the flow.
REFERENCES:
patent: 1097143 (1914-05-01), Singleton
patent: 4496133 (1985-01-01), Sule
patent: 4624282 (1986-11-01), Fargo
patent: 4664355 (1987-05-01), Kubach
patent: 4684102 (1987-08-01), Dykstra
patent: 4972996 (1990-11-01), Cerny
Manual for Siemens Servo Ventilator 300, pp. 136-137 (May 1993).
Eriksson Per-Goran
Krahbichler Erik
Slettenmark Bruno
Ball John
Ferensic Denise L.
Siemens-Elema AB
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