Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1998-05-22
2000-01-04
Walczak, David J.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 3005, 251 26, 251326, F16K 31145
Patent
active
060101121
ABSTRACT:
A driving device for a shut-off device in a pipe-line includes a piston/cylinder unit able to be connected to a slide valve plate of the shut-off device. A working chamber of the unit is connected with the interposition of a closing valve to a pressure medium reservoir. The pressure medium reservoir has an outlet opening connected virtually directly to an opening leading into the working chamber. The closing valve is constructed so that a very short closing time of the slide valve plate connected to the piston of the unit is achieved. The opening is provided in a head of the cylinder and opens into the working chamber. The opening can be closed by a valve disc of the closing valve. An annular chamber follows the valve disc on the side remote from the opening. The pressure medium of the pressure medium reservoir arrives in the chamber. After closing, the driving device can be reused without need of exchanging a deformed part.
REFERENCES:
patent: 3931953 (1976-01-01), Allen
patent: 4096881 (1978-06-01), Schabert et al.
patent: 4568058 (1986-02-01), Shelton
patent: 4613111 (1986-09-01), Paquet et al.
patent: 5150734 (1992-09-01), Chiba
Sistag Absperrtechnik
Walczak David J.
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