Proportion principle and the classification of pneumatic valve is what

proportional control pneumatic valve is mainly used for open loop control ( openloopcontrol) ； Proportional control pneumatic valve output to the input signal is proportional to the relationship, and the proportional control pneumatic valve in magnetic force generated by electromagnetic coil size is proportional to the current.
in traditional types of hydraulic pneumatic control valve, can only be carried out on the hydraulic constant value control, such as: pressure pneumatic valve in a certain set low, flow pneumatic valve to maintain through traffic, set direction pneumatic valve for liquid flow direction on/off switch. So the control system of pneumatic valve functions are subject to some restrictions, along with the advances in technology, many hydraulic pressure system for flow and pressure can be continuous or in proportion to changes along with the change of control pneumatic valve input signal. Hydraulic servo system can meet the requirements, and the precision is high, but for most of the industry, they do not require system has such a high quality, in the hope that under the condition of guarantee of control performance, and low cost, reliable operation, simple maintenance, so the proportional control pneumatic valve is developed in this context.
proportional control pneumatic valve can be divided into pneumatic pressure control valve, flow control and direction control of pneumatic valve.
pneumatic pressure control valve, proportional solenoid pneumatic valve to replace facilitated the overflow of the hand of the pneumatic valve adjustment device becomes conductive proportional relief pneumatic valve, the output of the hydraulic pressure by the input signal is continuous or proportional control.
flow control pneumatic valve, proportional solenoid pneumatic valve to replace the throttling pneumatic valve or speed of the hand of the pneumatic valve device and the input signal control pneumatic valve pneumatic valve or throttling speed control throttle opening mouth, can be continuous or in proportion to control the output flow. So the throttling mouth opening can be determined by the size of the input signal voltage.
direction control pneumatic valve: proportional solenoid pneumatic valve replace the direction of general solenoid pneumatic valve pneumatic valve pneumatic proportional direction valve, the sliding shaft can not only empathy, and empathy can trip or in proportion to changes in a row, so connected between the oil outlet oil area can be continuous or changes in proportion, so the proportional directional control pneumatic valve can not only control the movement direction of the actuators, also can control its speed.