Difference between different control valves
Classification:
Release Time：2017-11-29
In practice, the control valve plays a very important role, and the production of many factories depends on the correct distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction or simple container charging, require some final control element regulating valve to complete. Regulating valve is generally composed of two parts: actuator and valve assembly. In some cases with valve positioner, hand wheel mechanism and other accessories. The flow characteristic of the regulating valve is the relationship between the relative flow rate of the medium flowing through the regulating valve and its opening degree under the condition that the pressure difference between the two ends of the valve remains constant. The flow characteristics of the regulating valve have linear characteristics, such as percentage
In practice, the control valve plays a very important role, and the production of many factories depends on the correct distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction or simple container charging, require some final control element regulating valve to complete. Regulating valve is generally composed of two parts: actuator and valve assembly. In some cases with valve positioner, hand wheel mechanism and other accessories.
The flow characteristic of the regulating valve is the relationship between the relative flow rate of the medium flowing through the regulating valve and its opening degree under the condition that the pressure difference between the two ends of the valve remains constant. The flow characteristics of the regulating valve have linear characteristics, equal percentage characteristics and parabolic characteristics.
Pneumatic control valve, electric control valve and hydraulic control valve three differences are as follows:
1. Pneumatic control valve:
(1) Valves driven by compressed air.
(2) Working principle: The pneumatic control valve is composed of an actuator and an adjustment mechanism. The actuator is the thrust component of the regulating valve, which generates the corresponding thrust according to the size of the control signal pressure to push the regulating mechanism. The valve body is the regulating part of the pneumatic control valve, which is directly in contact with the regulating medium to regulate the flow of the fluid.
2. Hydraulic control valve:
(1) by means of oil and other liquid pressure driven valve.
(2) hydraulic valve classification: directional control valve, pressure control valve, flow control valve.
(3) The working principle of the directional control valve: The directional control valve controls the direction of the oil flow or the on and off of the liquid flow in the hydraulic system. Such as: check valve, reversing valve two-way hydraulic lock.
(4) The working principle of the one-way valve and the reversing valve: Use the relative movement of the valve core and the valve body to turn on, turn off or change the direction of the oil flow, so as to realize the start and stop of the hydraulic actuator and its driving mechanism Or change the direction of movement.
3. Electric control valve:
The valve is controlled by an electric actuator to open and close the valve. It can be divided into two parts, the upper half of the electric actuator, the lower half of the valve. Can also be called air conditioning valve. Electric valves are usually connected by electric actuators and valves, and become electric valves after installation and commissioning. The electric valve uses electric energy as power to connect the electric actuator to drive the valve to realize the switch and adjustment of the valve, so as to achieve the switch or adjustment of the pipeline medium.
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