Safety device for cylinder valve automatic switching unit

Details Safety device for cylinder valve automatic switching unit Safety device for cylinder valve automatic switching unit

1994-03-21

1995-09-05

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

60404, 251 31, 251 58, 251 59, F16K 3112, F15B 2000

Patent

active

054472857

ABSTRACT:
The invention relates to safety device for a cylinder valve automatic switching unit, wherein said valve is automatically closed when some abnormality such as down of an air pressure takes place. A first air-operated selector valve 8 is installed which causes air flowing out of a reservoir tank 10 to flow into a second supply line 3 when air pressure is reduced, whereby a cylinder valve automatic switching unit 1 in the opening situation is caused to make a closing motion for closing a cylinder valve in the opened situation. And, a second air-operated selector valve 9 is further installed which discharges air flowing out of a first supply line 2 to the atmosphere when the air pressure is reduced.

REFERENCES:
patent: 3752041 (1973-08-01), Smith
patent: 4872482 (1989-10-01), Jarrett

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