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Brief Analysis of the Treatment Scheme for the Failure of Fusheng Air Compressor Regulating Valve
The Fusheng air compressor regulating valve is used in the process control to protect the process from accidents, and the regulating valve is designed to achieve fail-safe protection measures. The regulating valve is further divided into an electric regulating valve and a pneumatic regulating valve. The electric regulating valve is relatively simple. When the signal is broken, it can stay in any position of full opening, full closing and holding according to the setting of the control module. When the power is off, it naturally stays in the fault position or has a reset device. Electric actuators can also be operated to fully open or fully close the valve position. The situation of the pneumatic control valve is relatively complicated. The following describes the retention scheme for the single-acting pneumatic diaphragm control valve and the double-acting pneumatic control valve.
The pneumatic diaphragm regulating valve solution mainly consists of a pneumatic regulating valve, an electric valve positioner, a power loss (signal) comparator, a single electronically controlled electromagnetic reversing valve, a pneumatic retaining valve, and a valve position signal returning device. Its working principle mainly includes gas source, power supply and signal breaking, referred to as “three breaksâ€. The position feedback signal is given by the valve position signal returner to the self-operated flow regulating valve. When the "three-break" protection is activated, the system reacts quickly and moves quickly. The overall cost is also cheaper. However, there are some disadvantages: the long-term charging of the solenoid valve will affect the service life. There are many accessories, the installation and commissioning process is more complicated, and the valve position feedback needs to be equipped with a valve position signal returner, which is more complicated in the case of a hand wheel.
The double-acting pneumatic regulating valve solution mainly consists of a control valve, a pneumatically controlled reversing valve, a positioner, a self-locking valve, a check valve, a pressure reducing valve, a gas storage tank and the like. When the control system loses gas, the self-locking valve is automatically opened, and the control air source of the pneumatically controlled reversing valve is cancelled. The sliding valve of the pneumatically controlled reversing valve is reset by the action of the spring, among the two pneumatically controlled reversing valves. One exhaust, the other intake, the check valve is closed, and the air supply is supplied to the valve by the air source stored in the air tank, thereby achieving full or full opening of the valve. The fully closed or fully open transition can be achieved by adjusting the connection of the pneumatically controlled directional control valve. If the valve retaining position is to be realized, install the pneumatic retaining valve and change the pipeline connection self-operated micro pressure regulating valve, directly control the retaining valve with the self-locking valve, and then cancel the pneumatic control reversing valve, check valve and gas storage tank. Once the gas source is out of gas, the check valve is closed, the lock valve is out of gas, the slide valve of the lock valve is reset by the action of the spring, the gas path is reversed, the gas source line of the system is disconnected, and the gas tank line is connected. The gas is supplied to the valve by the gas storage tank to ensure that the valve has several movements for continuous control purposes. Since the capacity of the gas storage tank is limited, and the pressure of the gas source in the gas storage tank is continuously decreasing as the valve moves, the gas storage tank cannot be used for gas supply for a long time. The capacity of the Fusheng gas storage tank should be greater than that of the general protection gas storage tank. 
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