What is the control principle of the discharge valve for this compressor?
Thread Content
What is the control principle of the discharge valve for this compressor?
The air source is a pressure regulator valve (this diagram shows it as independent); the valve itself tends to remain in the open position in case of a fault. The valve is equipped with an intelligent locator and a gas source amplifier; the solenoid valve is used for emergency discharge
Under normal conditions, electrical signals control the valve through electrical conversion (electrical positioning) via a pneumatically operated three-way valve； In the event of a fault, the solenoid valve controls the pneumatic valve to cut off the signal, allowing the cylinder pressure to be released into the atmosphere.
The above air circuit is designed to enable fast opening and slow closing of the valve: 1. Under normal conditions, the solenoid valve controls the air-operated valve, and the positioner (I/P) connects to the actuator via the air-operated valve, allowing for normal adjustment； 2. During interlocked venting, the solenoid valve loses power, the pneumatic circuit of the pneumatically controlled valve is switched, the actuator becomes connected to the exhaust port of the valve, allowing for rapid exhaust and thus quick opening of the valve (FO). This is generally used for anti-surge control in compressors.