Bellows Seal Globe Valves are suitable for inflammable, explosive, poisonous and precious media.
Bellows Seal Globe Valve Bellows Seal Globe Valve, Bellows Seal Valve Supplier, Bellows Globe Valve Manufacturer, Bellows Sealed Gate Valve Manufacturer Wenzhou Kolink Valve Co., Ltd. , http://www.kolinkvalves.com
Pneumatic control valve failure in the use of the method of protection
In the industrial automation and control, pneumatic control valve sometimes need fault protection, the following two-way pneumatic valve fault protection two ways for your reference. 1, the program mainly by the pneumatic control valve, solenoid valve, positioner, Paul-valve, one-way valve, diaphragm pump valve, gas tank and other components. Its working principle is as follows: When the control system gas source failure (loss of gas), the retention valve (the role of anti-Paul and the reverse valve) automatically open the solenoid valve to withdraw the control of air supply, solenoid valve spool in the spring Under the action of reset, one of the two solenoid valves is vented, the other is vented and the one-way valve is closed. The gas source supplies gas to the valve from the gas source stored in the gas tank so that the valve is fully closed or fully open . Full or fully open conversion can be achieved by adjusting the pneumatic control valve connection. If you want to achieve the valve retention, installation of pneumatic retention valve and change the pipe connection, with self-locking valve directly control the retention valve, solenoid valve, Check Valve, gas tank can be. 2, to achieve the gas source, to ensure that the valve has a number of actions, the control valve can use the following program. The program from the gas tank, one-way valve, lock valve, Globe Valve and other components. Its working principle is as follows: When the gas source failure (loss of gas), the one-way valve is closed, the lock valve is out of breath, the valve in the lock valve reset under the action of the spring, the gas line direction, disconnect the system of the source tube Road, connected to the gas tank pipeline, gas from the gas tank to the valve to ensure that the valve has several actions to achieve the purpose of continuous control. Due to the limited capacity of the gas tank and the pressure of the gas source in the gas tank, as the valve moves continuously, the gas tank can not be used for long-term supply of gas to the valve. The capacity of this program should be larger than the capacity of the gas tank for general protection. The program in the gas source, the number of valve action and the capacity of the gas tank. Pneumatic membrane valve for the preservation of the program, there is another for reference: Pneumatic valve positioner and actuator in series between the two-position valve and two-way solenoid valve in the expiration with the retention valve However, the solenoid valve must be interlocked with the positioner (set in the control program), that is, the positioner has a signal, the solenoid valve must be energized, and once the positioner has been energized Loss of signal, the solenoid valve must be immediately cut off.