How does the pneumatic valve change the AC to direct current?
Two. Comparison of pneumatic control valve and hydraulic valve(I) the energy used is differentPneumatic components and devices can use the air compressor station centralized gas supply method, according to the use requirements and control points to adjust the working pressure of each reducing valve. The hydraulic valve is provided with a return line to facilitate the collection of the hydraulic oil used by the tank. The pneumatic control valve can direct the compressed air to the atmosphere through the exhaust port.(two) the requirement of leakage is differentThe hydraulic valve is strict with the outward leakage, but a small leak inside the component is permissible. For pneumatic control valves, in addition to the clearance seal valve, in principle, does not allow internal leakage. The internal leakage of pneumatic valves causes the risk of accidents.For pneumatic pipes, a little leakage is allowed, and the leakage of the hydraulic pipe will cause pressure drop and pollution to the environment.
In addition to the three types of control valve, there are logic components that can achieve certain logic functions, including fluidic components with no moving parts inside components and pneumatic logic components with movable parts. In structure and principle, the logic element is basically the same as the directional control valve. It is only smaller in size and diameter. It is generally used to realize the logic operation function of the signal. In recent years, with the miniaturization of pneumatic components and the extensive application of PLC control in pneumatic systems, the range of application of pneumatic logic components is gradually reduced.From the control mode, pneumatic control can be divided into two categories: discontinuous control and continuous control. In the intermittent control systems, usually use the pressure control valves, flow control valves and directional control valve to achieve the program behavior; continuous control system, in addition to use pressure and flow control valves, but also by servo proportional control valve, etc., in order to carry out the continuous control of the system. Classification of pneumatic control valves.
The working principle of pneumatic valve:First, pneumatic control valve classification: pneumatic control valve refers to the pneumatic system to control the flow of air pressure, flow and flow direction, and to ensure that pneumatic actuators or institutions work properly all kinds of pneumatic components. A component that controls and regulates the pressure of a compressed air is called a pressure control valve. A component that controls and regulates the flow of compressed air is called a flow control valve. The element that changes and controls the direction of the flow of air is called a directional control valve.
The pneumatic valve is to control the air flow in the pneumatic system of the size, direction, and flow, and can not control the direct AC power supply, then if the pneumatic valve is required for switching power supply device of direct communication, can be solved by changing the power supply device.
