초록 ▼

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 di

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.

대표청구항 ▼

A tilt-disc check valve, comprising a valve body having valve seat means therein, tilt-disc valve means within said valve body adapted to cooperate with said valve seat means, means positioned substantially centrally on one face of said tilt-disc valve means for both supporting said valve means and

A tilt-disc check valve, comprising a valve body having valve seat means therein, tilt-disc valve means within said valve body adapted to cooperate with said valve seat means, means positioned substantially centrally on one face of said tilt-disc valve means for both supporting said valve means and for positively rotating said valve means in both directions about an axis located substantially centrally with respect to said one face and parallel thereto, said supporting and rotating means being adapted to positively rotate said valve means between a closed position in contact with said seat means and a partially open position out of contact with said seat means, and lost-motion means included in said supporting and rotating means rendering said valve means free for rotational movement between the closed position and a fully open position when said supporting and rotating means is in mid-position between the limits of its travel corresponding to the closed and partially open positions of said valve means.