Vacuum regulating valve

Details Vacuum regulating valve Vacuum regulating valve

2006-07-04

2006-07-04

Yu, Justine R. (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

C251S063600, C251S285000

Reexamination Certificate

active

07070159

ABSTRACT:
A vacuum regulating valve includes a valve casing provided with two main ports, a passage connecting the two main ports, a valve seat formed in the passage, a valve element capable of being seated on the valve seat, a valve stem extending from the valve element, and a piston attached to the free end of the valve stem. A valve opening setting unit includes a valve opening setting shaft having a free end held in contact with the back surface of the piston, and a driving mechanism capable of continuously axially moving the valve opening setting shaft to a desired position to set the piston at an operating position corresponding to a desired valve opening.

REFERENCES:
patent: 3155365 (1964-11-01), Hartung et al.
patent: 4461450 (1984-07-01), Soland et al.
patent: 5848608 (1998-12-01), Ishigaki
patent: 6814338 (2004-11-01), Kajitani
patent: 08-178126 (1996-07-01), None

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