The reducing valve uses the opening of the opening and closing parts in the control valve body to adjust the flow of the medium, reducing the pressure of the medium, and at the same time adjusting the opening of the opening and closing parts by the pressure behind the valve to make the pressure behind the valve Keep it within a certain range, and spray cooling water into the valve body or behind the valve to reduce the temperature of the medium. This kind of valve is called a pressure reducing valve. The characteristic of this valve is to keep the outlet pressure and temperature within a certain range when the inlet pressure is constantly changing. The pressure reducing valve is a required accessory of the pneumatic regulating valve. Its main function is to reduce the pressure of the air source and stabilize it to a fixed value, so that the regulating valve can obtain stable air source power for regulating control. This type of valve should generally be installed horizontally in the pipeline.
The gas pressure reducing valve is a special device that automatically reduces the working pressure of the pipeline. It can reduce the higher liquid pressure in the pipeline before the valve to the level required by the pipeline after the valve. There are many structural types of pressure reducing valves, which can be divided into membrane type, spring membrane type, piston type, lever type and bellows type according to the structural form. According to the number of valve seats, it can be single-seat and double-seat. According to the position of the valve disc, it can be divided into positive-acting and counter-acting. According to the medium, it can be divided into nitrogen pressure reducing valve, hydrogen pressure reducing valve, oxygen pressure reducing valve and so on. The basic working principle of the pressure reducing valve is to reduce the water pressure by the local resistance of the flow passage in the valve to the water flow. The range of the water pressure drop is automatically adjusted by the diaphragm connecting the valve flap or the water pressure difference between the inlet and outlet on both sides of the piston. The principle of constant-ratio pressure reduction is to use the water pressure ratio control of the floating piston in the valve body. The pressure-reducing ratio at the inlet and outlet is inversely proportional to the piston area ratio at the inlet and outlet. Technology is further improved.