ELECTRICALLY-DRIVEN AIR-OPERATED BALL-VALVE DRIVE CONTROL DEVICE Russian patent published in 2008 - IPC F15B9/03 F16K31/126 

FIELD: engines and drives.

SUBSTANCE: device incorporates two electric magnets and two hermetically-sealed reed relays in a blast-proof jacket, air-operated valves, and a panel with lines feeding gas into the ball-valve inlet and forcing it therefrom. The device incorporates an automatic emergency ball-valve shut-off device designed as an air-operated cylinder with a gauging gate reacting to the pressure drop rate in the gas main. With the said drop rate exceeding the preset one, the aforesaid air-operated cylinder gets triggered off to move the rod to actuate a spring mechanism cutting in the ball-valve shut-off air-operated valve. The device is furnished with a spring-loaded plate incorporating an adjusting screw, a rotary lever with a permanent magnet arranged on the lever one end. Here note that the lever is bracket-mounted on the blast-proof jacket inside which a third hermetically-sealed reed relay. The aforesaid rotary lever is designed so that its permanent magnet can act on the third extra said reed relay in operation of the spring mechanism. Here, the rotary lever is coupled via an extra spring with the panel so that the lever other end is in a constant contact with the spring-loaded plate adjusting screw.

EFFECT: higher reliability.

6 dwg