Pneumatic control valves have both static and dynamic characteristics, which affects the success or failure of the entire control loop. The static characteristic or gain term is the flow characteristic of the valve and it depends on the size of the valve, the combination of the valve plug and valve seat, the type of actuator, the positioner of the valve, the pressure in front of the valve and behind the valve, and the nature of the fluid.
The dynamic characteristics of the pneumatic control valve are determined by the combination of the actuator or the positioner-actuator. For slower production processes such as temperature control or level control, the valve dynamics are generally not a limiting factor in terms of controllability. For faster systems, such as liquid flow control, the regulator valve may have significant hysteresis and must be considered in terms of loop controllability. Only experts of the control system generally need to care about the dynamic stability of the regulating valve. The formal considerations regarding the application of the valve positioner, as discussed in Chapter 9, will satisfy the needs of most regulating valve devices.
Pneumatic regulating valves include regulating valves, throttle valves and pressure reducing valves. Their role is to regulate the pressure, flow rate and other parameters of the medium. Regulators are divided into nine categories according to the structure: (1) single-seat control valve; (2) two-seat control valve; (3) sleeve control valve; (4) angle control valve; (5) three-way control valve; (6) diaphragm valve; (7) butterfly valve; (8) ball valve; (9) eccentric rotary valve. The first six are straight strokes and the last three are angular strokes. Regulating valves, used to regulate the flow, pressure and level of media, pneumatic control valves and are usually divided into two kinds of straight single-pass type and direct two-seat type, the latter has the characteristics of large flow capacity, small imbalance, and stable operation. Therefore, it is generally suitable for applications with large flow, high pressure drop, and low leakage. The valve is a control component in the fluid delivery system and has functions such as cut-off, regulation, diversion, reverse flow, pressure regulation, diversion, or pressure relief. Valves for fluid control systems, from the simplest shut-off valve to the various valves used in highly complex automatic control systems
The dynamic characteristics of the pneumatic control valve are determined by the combination of the actuator or the positioner-actuator. For slower production processes such as temperature control or level control, the valve dynamics are generally not a limiting factor in terms of controllability. For faster systems, such as liquid flow control, the regulator valve may have significant hysteresis and must be considered in terms of loop controllability. Only experts of the control system generally need to care about the dynamic stability of the regulating valve. The formal considerations regarding the application of the valve positioner, as discussed in Chapter 9, will satisfy the needs of most regulating valve devices.
Pneumatic regulating valves include regulating valves, throttle valves and pressure reducing valves. Their role is to regulate the pressure, flow rate and other parameters of the medium. Regulators are divided into nine categories according to the structure: (1) single-seat control valve; (2) two-seat control valve; (3) sleeve control valve; (4) angle control valve; (5) three-way control valve; (6) diaphragm valve; (7) butterfly valve; (8) ball valve; (9) eccentric rotary valve. The first six are straight strokes and the last three are angular strokes. Regulating valves, used to regulate the flow, pressure and level of media, pneumatic control valves and are usually divided into two kinds of straight single-pass type and direct two-seat type, the latter has the characteristics of large flow capacity, small imbalance, and stable operation. Therefore, it is generally suitable for applications with large flow, high pressure drop, and low leakage. The valve is a control component in the fluid delivery system and has functions such as cut-off, regulation, diversion, reverse flow, pressure regulation, diversion, or pressure relief. Valves for fluid control systems, from the simplest shut-off valve to the various valves used in highly complex automatic control systems
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