In service exercisable tilt disc check valve

Details In service exercisable tilt disc check valve In service exercisable tilt disc check valve

1975-05-21

1977-06-14

Rosenthal, Arnold

Valves and valve actuation

Lost motion between actuator and valve

Check valve with external opening and closing means

1375278, 251 58, 251 634, F16K 1518

Patent

active

040292908

ABSTRACT:
An in service exercisable tilt disc check valve is provided having an externally controlled power actuator connected to the valve shaft for moving the valve disc relative to the valve seat. The valve shaft has a radially extending tooth which is received in an elongated sector socket in the valve disc. As the shaft is rotated, the tooth engages the end shoulders of the socket and provides a connection between the shaft and valve disc. With the tooth positioned intermediate the socket ends, the valve disc is free to swing on the shaft.
By selectively positioning the valve shaft, the valve disc may be forced to close against the valve seat to inspect the sealing integrity of the valve or the disc may be displaced from the valve seat to "exercise" the valve. The valve shaft may also be positioned to allow the valve disc to pivot normally as a check valve.
A pneumatic power cylinder is coupled to the valve shaft through a rack and gear drive while a second cylinder limits the degree of extension of the power cylinder. A compression spring biases the rack to drive the valve disc to the closed position.

REFERENCES:
patent: 1367911 (1921-02-01), Koplin
patent: 2251414 (1941-08-01), Neal
patent: 2504006 (1950-04-01), Davis
patent: 3106220 (1963-10-01), Hose
patent: 3494589 (1970-02-01), Mumma
patent: 3650506 (1972-03-01), Bruton
patent: 3818805 (1974-06-01), Johansson
patent: 3883111 (1975-05-01), Jourdan

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