Valve actuated by its own medium

Details Valve actuated by its own medium Valve actuated by its own medium

1995-12-20

1996-10-15

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251282, F16K 3144, F16K 3172

Patent

active

055646743

ABSTRACT:
The valve comprises a first pressure chamber (2), an outlet chamber (6) and a valve body (8), cooperating with a first valve seat (12), and also a second pressure chamber (13) delimited by the valve body. The valve body (8) comprises a control piston (22) which cooperates with a second valve seat (26) and is movable between a closing position and an open position. The control piston delimits in a valve chamber (17) a first sub-chamber, which faces away from the second valve seat (26) and communicates with the first pressure chamber (2), a second sub-chamber, which faces the second valve seat (26) and communicates with the outlet chamber (6), and a middle sub-chamber, which surrounds the cylindrical surface of the control piston and communicates with the second pressure chamber (13). The control piston (22) establishes in the closing position transfer communication between the first and the middle sub-chamber, and in the open position transfer communication between the second and the middle sub-chamber. The valve body (8), which is designed as an equalizing piston, adjusts itself always like a follower piston with respect to the control piston (22) which may be driven by a controllable positioner (19), and is controllably displaceable thereby between the first valve seat (12) and the various open positions.

REFERENCES:
patent: 3405906 (1968-10-01), Keller
patent: 3612476 (1971-10-01), Leitgeb
patent: 4746093 (1988-05-01), Scanderbeg
patent: 4779837 (1988-10-01), Mito et al.
patent: 4997159 (1991-03-01), Yoshino et al.

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