Classification and principle introduction of high pressure reducing valve

The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and automatically keeps the outlet pressure stable by relying on the energy of the medium itself. From the point of view of hydrodynamics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow rate and kinetic energy of the fluid can be changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, by the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.

The high-pressure pressure reducing valve regulates the flow of medium by controlling the opening of the opening and closing parts in the valve body to reduce the pressure of the medium. At the same time, the opening of the opening and closing parts is adjusted with the help of the pressure behind the valve to keep the pressure behind the valve within a certain range. When the inlet pressure changes continuously, the outlet pressure is kept within the set range to protect the subsequent life and production appliances.

The high-pressure reducing valve is a * accessory of the pneumatic regulating valve, which is mainly used 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 regulation and control.

According to the structure, it can be divided into diaphragm type, spring diaphragm type, piston type, lever type and bellows type; According to the number of valve seats, it can be single seat type and double seat type; According to the position of the valve disc, it can be divided into positive action type and reaction type.

The operation of the high pressure reducing valve is controlled by the pressure behind the valve. When the pressure sensor detects that the valve pressure indication increases, the valve opening of the pressure reducing valve decreases; When the pressure decreases after the pressure reducing valve is detected, the opening of the pressure reducing valve increases to meet the control requirements.

High pressure reducing valve - the pressure reducing ratio of the valve must be higher than the system value to a certain extent; It should be able to respond to positive or negative control signals even when Zui is large or Zui is small. These valves should be selected for the useful control range, i.e. 20% to 80% of Zui's large flow. It is normally of equal ratio type or has equal ratio characteristics. These types of valves have their own flow characteristics and flow ranges required for proportional control.