Avcon Controls offers Hydro Motor Valve HMV Type, which is normally closed, hydraulically operated safety valve.
When the mains signal is given to an actuator, the internal oil pump builds up the pressure. This oil pressure slowly acts from downward direction on actuator piston. The oil pump switches off as the valve opens completely. The pressure is continuously maintained within the actuator. In event of occurence of drop in pressure while closing the valve, the mains voltage has to be disconnected. After disconnecting the mains signal, the oil pressure is revealed and the valve disc is getting closed within 1 second with the help of closing spring force.
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