What is the working principle of electro-hydraulic proportional relief valve, what is the sign of valve body?
The driving voltage of the valve is generally 0 to 10V has a special drive circuit board through different voltage given to change the overflow resistance to flexibly change the system flow, cross-sectional area is constant speed following changes to the role of regulationBody symbol Baidu search electromagnetic proportional relief valve on the line
Proportional speed control valve has two pass, three pass. There is a straight lead. The basic structure is proportional to the electromagnet drive spool movement, the valve opening size changes gradually, thereby controlling flow. The most basic structure is throttle type speed control valve, if the load pressure to the other end of the valve, and the balance of the electromagnet, that is, overflow type speed regulating valve.The symbol is a symbol of the throttle valve, the upper side is provided with an electromagnet symbol, a slanted arrow on the electromagnet, said electromagnet ratio adjustable.
Ordinary relief valve and proportional relief valve, there is a spool, one end of the spool is hydraulic oil pressure, and the other end is mechanical force. The common relief valve adjusts the hydraulic pressure by adjusting the spring force. Proportional relief valve is the electromagnet to generate thrust, acting on the valve core, the input voltage on the electromagnet can vary in 0-24 volts between the thrust produced change, hydraulic pressure to obtain continuous change.Because the thrust of the proportional solenoid is not large, so the direct flow type proportional relief valve flow is very small, pressure 70 MPa, the flow is only 1 liters / minute or so. Need large flow proportional valve, it is necessary to make this proportional valve pilot valve, but also with a large diameter relief valve below.Overflow relief valve is to rely on the intake of the throttle role of decompression, relying on the balance of force on the diaphragm and overflow of the overflow role of pressure regulation; adjustment of the spring can make the output pressure within a certain range of change. Above the overflow valve to prevent gas discharged pollution to the surrounding environment, can be used without the relief valve of the valve (the common valve).The pressure reducing valve is used to adjust the inlet pressure to a required outlet pressure and to depend on the energy of the medium itself so that the outlet pressure is automatically kept stable. From the viewpoint of fluid mechanics, the valve is a throttling element local resistance to change, namely by changing the throttle area, the velocity of the fluid and kinetic energy change, resulting in different pressure loss, so as to achieve the purpose of decompression. Then, depending on the regulation of the control and adjustment system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve is kept constant in a certain range of error.
