Working principle and function of pressure reducing valve

Whether in age of steam or in the electrical age, people use the great pressure generated by the chemical changes of energy to drive the components to move, so as to achieve the purpose of working for mankind. Of course, there is pressure to have motivation. This sentence is very reasonable whether in the industry or in our daily life, but if the pressure is too great, it will affect the normal work. So there is something completely opposite to the pressure reducing valve.

Working principle of pressure reducing valve:

The pressure reducing valve adjusts the flow rate of the medium by controlling 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 by the pressure behind the valve to keep the pressure behind the valve within a certain range, and cooling water is injected into the valve body or behind the valve to reduce the temperature of the medium. This kind of valve is called decompression and desuperheating valve. Includes automatic selection of 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.

Pressure reducing valves can be divided into diaphragm type, spring diaphragm type, piston type, lever type and bellows type according to their structural forms; According to the number of valve seats, it can be manual single-seat and double-seat type; According to the position of intervertebral disc, it can be divided into active type and reactive type. Pilot-operated pressure reducing valve When the output pressure of the pressure reducing valve is high or the diameter is large, if the pressure regulating spring is used to directly regulate the pressure, the spring stiffness will be too large. When the flow changes, the output pressure fluctuates greatly, and the structural size of the valve will also increase. In order to overcome these shortcomings, a pilot pressure reducing valve can be used. The working principle of pilot relief valve is basically the same as that of direct-acting valve. The pressure regulating gas used in the pilot relief valve is provided by a small direct-acting relief valve. If a small direct-acting safety valve is installed in the valve body, it is called an internal pilot relief valve; If a small direct-acting safety valve is installed outside the main valve body, it is called an external pilot relief valve.

function

The working principle of the pressure reducing valve is to reduce the water pressure through the local resistance of the flow passage in the valve, and automatically adjust the range of water pressure reduction through the water pressure difference between the diaphragm connecting the valve disc or the inlet and outlet of the piston. The principle of constant pressure reduction is controlled by the water pressure ratio of the floating piston in the valve body, and the pressure reduction ratio at the inlet and outlet ends is inversely proportional to the area ratio of the piston at the inlet and outlet sides. This pressure reducing valve works smoothly without vibration; There is no spring in the valve body, so there is no need to worry about spring corrosion and metal fatigue failure; Good sealing performance, no leakage, reducing both dynamic pressure (when water flows) and static pressure (when the flow rate is 0); In particular, the pressure is reduced without affecting the water flow.

Although the water flowing through the pressure reducing valve has a great head loss, it is still energy-saving as a whole because it reduces the waste of water, makes the system flow distribution reasonable and improves the system layout and working conditions. When the medium is steam, pilot piston pressure reducing valve or pilot bellows pressure reducing valve should be selected. In order to facilitate operation, adjustment and maintenance, pressure reducing valves should generally be installed on horizontal pipelines.

App application

The fluid decompressed by the combined pressure reducing valve is filtered by the water filter, and then enters each water consumption point through the hydraulic control valve. If the pipeline is overpressure, the pressure relief valve will be fully opened to relieve the pressure in time.

1. The combined pressure reducing valve provides stable and reliable low-pressure cooling water for the water point behind the valve on the premise of ensuring the water consumption of the unit. The maximum decompression ratio can reach 12: 1. The recoil blowdown system equipped on the combined pressure reducing valve can be suitable for bad media, and the safety locking system can ensure that the outlet pressure remains low when the system is seriously damaged.

2. The water filter installed on the technical water supply system can provide clean water for the unit to prevent impurities from entering the unit and causing damage. If the water filter is installed behind the combined pressure reducing valve, users can choose a water filter with a smaller pressure grade, but too many impurities will affect the stability of the pressure reducing valve.

3. The hydraulic control valve on the technical water supply system cuts off the medium flow in the pipeline by opening quickly and closing slowly, and eliminates the water hammer pressure in the pipeline. The hydraulic control valve with good performance can be backwashed and discharged when it is opened and closed, so as to ensure that it will not be blocked under working conditions.

4. The relief valve on the technical water supply system can accurately maintain the safe pressure of the pipeline. Once the pipeline exceeds the set pressure, the pressure relief valve will be fully opened to relieve the pressure in time. In addition to the feedback system, the pressure relief valve with good performance also has a forced opening handle, which can switch the feedback system or directly discharge manually when a fault occurs.

The above small series tells you the working principle and usage of the pressure reducing valve. From the pictures in the article, we can easily find that this tool called pressure relief valve looks like a faucet. In fact, his principle is very close to the faucet. The faucet also releases water through pressure, which is actually a pressure reducing valve in disguise. Bian Xiao explained this for everyone. I believe everyone will understand this, right

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