Proportional valve principle and classification analysis
Proportional control valve is mainly used for open loop control (openloopcontrol); Proportional control valve of output and input signal proportional relationship, and proportional control valve in electromagnetic coil produced by the magnetic force is proportional to the size and current.
In the traditional type of hydraulic control valve, only to hydraulic for fixed value control, for example: the pressure valve in a set pressure obscene move, flow valve keep through the set flow, the direction valve for fluid flow direction on/off switch. Shandong Mr Too welder so the control valve of system function are subject to some limitations, along with the progress of technology, many hydraulic system requirements for flow and pressure can be continuous or proportional to the input signal with the control valve changes. Hydraulic servo system is can meet the requirements, and the precision is high, but for most of the industrial speaking, they are not asking system has such a high quality, and hope in the guarantee of control performance conditions, and at the same time, the price is low, reliable operation, easy maintenance, so proportional control valve is in this context of the development of.
Proportional valve can be divided into pressure control valve, flow control and direction control valve three categories.
Pressure control valve: use proportional electromagnetic valve to replace conductive overflow valve manual setting the United States miller welder device become conductive proportional relief valve, and its output of hydraulic pressure by the input signals in continuous or proportional control.
Flow control valve: use proportional electromagnetic valve instead of throttle valve or governing valve hand adjustment device and input signal control ZF Hydraulic throttle valve or speed regulating valve of the throttle mouth opening, can be continuous or proportional to the control of its output flow. The throttle mouth open degree can by the input signal voltage size decision.
Direction control valve: proportional electromagnetic valve to replace direction valve coco valve general electromagnetic valve which is a direct acting proportional directional valve, and its slip shaft can not only transposition and transposition of stroke can be continuous or proportional to the change, thus connected oil between the mouth through oil area can also be continuous or proportional to the change, so the proportional direction control valve can not only control the implementation of the components of the moving direction, but also can control its speed.
Pressure switch
Chinese
Deutsch
Espanol
Francais
Italiano
Portugues
Japanese
Korean
Arabic
Russian