Direct-acting valve working medium

Direct acting valve is opened under the direct action of the working medium, which rely on the role of the working medium pressure against the biasing mechanism is applied to the Gas Heater Control Valve flap mechanical load, the valve open. This safety valve has a simple structure, quick action, good reliability advantages. But because relying on the structure of load, the load size is limited and can not be used for high-pressure, large diameter occasions.