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Working principle and classification of high pressure relief valve

I believe that everyone is familiar with the pressure reducing valve, then how much do you know about the pressure reducing valve? The pressure reducing valve is a valve that adjusts the inlet pressure to a certain required outlet pressure and relies on the energy of the medium itself to automatically maintain the outlet pressure. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure loss, thereby achieving the purpose of decompression. Then, relying on the adjustment of the control and regulation system, the fluctuation of the post-valve pressure is balanced with the spring force, so that the post-valve pressure remains constant within a certain error range.
The high pressure reducing valve adopts the opening degree of the opening and closing member in the control valve body to adjust the flow rate of the medium, reduce the pressure of the medium, and adjust the opening degree of the opening and closing member by the action of the pressure behind the valve, so that the pressure behind the valve is kept constant. Within the scope of the import pressure, keep the outlet pressure within the set range and protect the subsequent life production equipment.
The high pressure relief valve is an essential accessory for the pneumatic control valve. The main function is to decompress and stabilize the pressure of the air supply to a fixed value, so that the regulating valve can obtain stable air source power for adjustment control.
According to the structure, it can be divided into diaphragm type, spring diaphragm type, piston type, lever type and bellows type; the number of seat seats can be artificial single seat type and double seat type; according to the position of the valve flap, it can be divided into positive action type. And reactionary.
The operation of the high pressure relief valve is controlled by the post-valve pressure. When the pressure sensor detects that the valve pressure indication is increased, the valve opening degree of the pressure reducing valve is decreased; when the pressure reducing valve is detected, the pressure is decreased, and the valve opening degree of the pressure reducing valve is increased to meet the control requirement.
High Pressure Relief Valve - The decompression ratio of the valve must be somewhat higher than the system value; it should be able to respond to positive or negative control signals even at maximum or minimum flow. These valves should be selected for a useful control range, ie 20% to 80% of the maximum flow. Normally equal or have equal ratio characteristics. These types of valves inherently have the optimum flow characteristics and flow ranges required for proportional control.

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