In industrial automation control, pneumatic control valve sometimes need to fault the position, the following proposed double-acting pneumatic control valve fault the position of the two methods, for your reference. 1, this system is mainly composed of pneumatic control valve, solenoid valve, locator, valve, check valve, relief valve diaphragm pump, storage tanks, etc. Its working principle is as follows: when the air supply control system failure ( Loss of air pressure) When a valve ( The role of way contrary to the position valve) Solenoid valve will automatically open, gas source, the control of electromagnetic valve of the valve under the action of the spring reset, one of the two solenoid valve exhaust, another intake, one-way valve closed, air supply by air to the air supply valve, stored in the storage tanks to close or open the valve. Close or open the conversion can be adjusted through the connecting way of pneumatic directional valve. If you want to achieve the position of valve, equipped with pneumatic valve and change the pipeline connection, directly with self-locking valve control Industrial Valves, solenoid valve, check valve, air tank. 2, if you want to achieve break gas source, to ensure the valve several times, regulator can adopt the following solutions. The program storage tanks, one-way valve, latching valve, stop valve, etc. Its working principle is as follows: when the air supply failure ( Loss of air pressure) Loss of air pressure, the check Industrial Valves closed, blocking valve, in latching valve valve under the action of the spring reset, pneumatic directional control, air piping that open system, through to storage tanks line, from the storage tanks to the valve gas supply, to ensure that the valve has a number of times, to achieve the purpose of continuous control. Due to the limited capacity of storage tanks, and the air pressure in the gas tank with the valve movement is declining, not long-term use of storage tanks for the valve gas supply. This scheme with the capacity of the storage tanks should be bigger than general protection with the capacity of the storage tanks. This scheme in the off gas source, the valve action related to the capacity of the storage tanks. For the position scheme of pneumatic diaphragm regulating valves, as well as a reference: pneumatic control valve series between the positioner and actuator and the position control valve (one, two of the 3-way magnet valve (when expired with to the position, the position control valve when the fault signal, using electromagnetic valve to the position, however, solenoid valve must be conducted with the locator chain ( Set in the control program) Have signal, namely the locator, solenoid valves, electrical, locator once lost signal, the electromagnetic Industrial Valves must immediately without electricity.
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