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In view of the user's needs, Yili Valve will organize the working principle of various pressure reducing valves into pieces and share them with you. 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 losses, 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 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 pressure difference between the inlet and outlet of the membrane or the piston connected to the valve flap. In recent years, some new types of pressure reducing valves have emerged, such as fixed ratio pressure reducing valves. The principle of constant pressure reduction is to use the water pressure ratio control of the floating piston in the valve body, and the pressure reduction ratio at the inlet and outlet ends is inversely proportional to the ratio of the piston area on the inlet and outlet sides. The pressure reducing valve works smoothly and without vibration; there is no spring in the valve body, so there is no spring corrosion and metal fatigue failure; the sealing performance is good and does not leak, so the pressure is reduced (when the water flows) and the static pressure is reduced (the flow rate is 0 o'clock); especially during decompression without affecting water flow.
The pressure reducing valve is classified into an active pressure reducing valve, a piston type pressure reducing valve, and a diaphragm type pressure reducing valve according to the type. According to the medium, it is divided into gas pressure reducing valve, air pressure reducing valve, oxygen pressure reducing valve, vapor pressure reducing valve, nitrogen pressure reducing valve, gas pressure reducing valve and water pressure reducing valve.
The working principle of the pressure reducing valve:
The pressure relief valve is a special device that automatically reduces the working pressure of the pipeline. It reduces the higher water pressure in the pipeline before the valve to the level required for the pipeline behind the valve. Pressure reducing valves are widely used in high-rise buildings, urban water supply networks, water pressure areas, mines and other occasions to ensure that the water supply system in the water supply system to obtain appropriate service water pressure and flow. Since the water leakage rate and the degree of waste are almost proportional to the water pressure of the water supply system, the pressure reducing valve has an improved system operating condition and potential water saving effect, and the water saving effect is about 30% according to statistics. This valve is best for adjusting the accuracy level.
The working principle of the pressure reducing valve
Working principle of steam pressure reducing valve Firstly, the working principle of steam pressure reducing valve is that the pressure reducing device will have a probe, one end of the probe is spring-loaded, the probe extends into one end of the pipe and is sealed at the other end of the pressure reducing device. When the air pressure is greater than the top force of the spring, the mouth connected to the exhaust device is opened by the mechanism. Decompression begins, and when the air pressure is less than the top force of the spring, the mechanism is restored.
Steam pressure reducing valve working principle source
Working principle of gas pressure reducing valve The gas 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. The post-valve pressure is kept within a certain range, and cooling water is sprayed into the valve body or behind the valve to lower the temperature of the medium. This valve is called a decompression and desuperheating valve.
Source of working principle of gas pressure reducing valve
Working principle of nitrogen pressure reducing valve The nitrogen pressure reducing valve is composed of two parts: main valve and pilot valve. The main valve is mainly composed of a valve seat, a main valve disc, a piston, a spring and the like. The pilot valve is mainly composed of a valve seat, a valve disc, a diaphragm, a spring, an adjustment spring and the like. The pressure reducing valve adjusts the outlet pressure by adjusting the spring pressure, and uses the diaphragm to sense the change of the outlet pressure. The pilot valve is opened and closed by the pilot valve to adjust the flow area of ​​the throttle portion of the main valve to realize the pressure reduction and voltage stabilization function.
Nitrogen pressure reducing valve working principle source
Oxygen Pressure Reducing Valve Working Principle The high pressure chamber of the oxygen pressure reducing valve is connected to the cylinder, and the low pressure chamber is a gas outlet and leads to the use system. The indication of the high pressure gauge is the pressure of the stored gas in the cylinder. The outlet pressure of the low pressure gauge can be controlled by an adjustment screw. When using, first open the cylinder main switch, then turn the low pressure gauge pressure adjusting screw clockwise to compress the main spring and drive the film, spring block and ejector to open the valve. The imported high-pressure gas is depressurized by the high-pressure chamber and then enters the low-pressure chamber and leads to the working system through the outlet. Turn the adjusting screw to change the height at which the valve opens, thereby adjusting the throughput of the high pressure gas and achieving the desired pressure value.
Oxygen pressure reducing valve working principle source
Working principle of water pressure reducing valve The water pressure reducing valve uses the opening degree of the opening and closing member in the control valve body to adjust the flow rate of the medium, reduces the pressure of the medium, and adjusts the opening degree of the opening and closing member by the action of the pressure behind the valve. The post-valve pressure is kept within a certain range, and cooling water is sprayed into the valve body or behind the valve to lower the temperature of the medium. This valve is called a decompression and desuperheating valve. The valve is characterized by keeping the outlet listening pressure and temperature within a certain range in the case of constant changes in inlet pressure. The pressure reducing valve is an essential accessory of the pneumatic regulating valve. The main function is to decompress and stabilize the pressure of the air source to a fixed value, so that the regulating valve can obtain stable air source power for adjustment control. According to the requirements of use, the type of pressure reducing valve and the pressure regulation accuracy are selected, and then the diameter is selected according to the required maximum output flow rate. When determining the source pressure of the valve, it should be greater than the maximum output pressure of 0.55MPa. The pressure reducing valve is generally installed after the water separator, before the oil mister or the constant value device, and be careful not to reverse the inlet and outlet; when the valve is not in use, the knob should be loosened to prevent the diaphragm from being constantly deformed by pressure. Its performance. This type of valve should generally be installed horizontally in the pipeline.
Water pressure reducing valve working principle source
Working principle of the pressure reducing regulator When the pipeline feeds water from the inlet end, the water flows through the needle valve into the main valve control chamber, and the outlet pressure acts on the pilot valve through the conduit. When the outlet pressure is higher than the pilot valve setting value, the pilot valve When it is closed, the control room stops draining. At this time, the main valve controls the pressure in the chamber and closes the main valve, and the outlet pressure no longer rises.
When the outlet pressure drops to the pilot set pressure, the pilot valve opens and the control chamber drains downstream. Since the displacement of the pilot valve is greater than the water intake of the needle valve, the pressure in the main valve control chamber drops, and the inlet pressure causes the main valve to open. Under steady state, the control room has the same water and drainage, the opening is unchanged, and the outlet pressure is unchanged. The outlet pressure can be set by adjusting the pilot valve spring.
Source of working principle of pressure reducing regulator
Corrugated pipe pressure reducing valve working principle Bellows pressure reducing valve is an essential accessory for pneumatic regulating valve. Its main function is to decompress and stabilize the pressure of the air source to a fixed value, so that the regulating valve can obtain stable air source power. Used to adjust the control. The operation of the bellows pressure reducing 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 opening degree of the pressure reducing valve is increased to meet the control requirement.
The working principle of bellows pressure reducing valve
Working principle of proportional pressure reducing valve Under the action of inlet pressure P1, the floating piston is pushed open and the medium passes. The pressure difference caused by the different cross-sectional areas at both ends of the piston changes the pressure behind the valve, that is, the pressure ratio of the two ends of the piston constitutes the pressure ratio between the front of the valve and the rear of the valve. Regardless of how the pressure in front of the valve changes, the post-valve static pressure and dynamic pressure can be reduced to the corresponding pressure value.
Proportional pressure reducing valve working principle source
Pilot piston type pressure reducing valve working principle
1. The pilot type pressure reducing valve is composed of a main valve and a pilot valve. The control part is a pilot valve. By adjusting the loading force of the pilot valve spring, the pressure at the outlet end of the main valve is changed to reach the set pressure value, and the medium itself is utilized. The feedback force of the energy automatically keeps the pressure at the outlet end substantially stable at the set value.
2. The pilot valve and pilot valve are closed before the pilot pressure reducing valve is operated. When starting the operation, first rotate the adjusting screw of the pilot valve to make the spring of the pilot valve load and push the diaphragm downward to open the pilot valve. The medium then enters the piston of the main valve to push the piston downward, and the main valve opens with the valve. The directional movement opens the main valve, the medium flows to the outlet end, so that the outlet pressure reaches the set value, and the medium also enters below the pilot diaphragm. When the outlet pressure increases, the pressure of the medium acting under the diaphragm of the pilot valve is greater than the loading force of the adjusting spring, the valve flap moves in the closing direction, and the outlet pressure decreases; conversely, when the outlet pressure decreases, the pilot flap opens toward the opening direction. Movement, so that the pressure at the outlet end increases, and the pressure at the outlet end is always kept stable at the set value.
Pilot piston type pressure reducing valve working principle
Through introduction, in the process of selecting and using the pressure reducing valve, the user is reminded to pay attention to the above matters, and do not blindly select the type, resulting in unnecessary waste of resources. In the process of purchasing and using the pressure reducing valve, you can consult a vertical valve for technical problems.
A vertical valve pressure reducing valve: http://?109_1.html