Product Introduction
The pressure reducing valve is a valve that reduces the inlet pressure to a certain outlet pressure by adjusting, and relies on the energy of the medium itself to keep the outlet pressure stable automatically. From the point of view of fluid mechanics, the pressure reducing valve is a local resistance can change the throttling element, that is, by changing the throttling area, so that the velocity and kinetic energy of the fluid change, resulting in different pressure loss, so as to achieve the purpose of decompression. Then rely on the control and regulation of the system, so that the fluctuation of the pressure after the valve and the spring force balance, so that the valve pressure in a certain error range to maintain a constant.
Product Advantage
Although the water flow through the pressure reducing valve has a great head loss, it is still energy saving in general because it reduces the water waste, makes the system flow distribution reasonable, and improves the system layout and working conditions.When the medium is steam, the pilot piston type pressure reducing valve or the pilot bellows type steam pressure reducing valve should be selected. For the convenience of operation, adjustment and maintenance, adjustable pressure reducing valve should generally be installed on the horizontal pipeline.
Product Structure
1. Automatic regulation principle of combined pressure reducing valve:
The combined relief valveis a pressure regulating valve that can also be self-regulated by water pressure under complex and changeable working conditions. It keeps the pressure and flow at the outlet stable when the pressure and flow at the inlet change.It fully realizes self-control, simple debugging and reliable operation.
2. Double feedback switching principle of combined reducing valve:
The feedback system of the combined pressure reducing valve is an independent system which controls the flow area (throttle cone opening) according to the change signal of the outlet pressure of the pressure reducing valve. The pressure reducing valve is equipped with two backup feedback systems. The operation mode of starting system A and disusing system B can achieve the purpose of maintaining the pressure relief valve without stopping the machine.
3. Working principle of combined pressure reducing valve recoil and sewage discharge:
The operation condition of hydropower station is very complicated, especially the quality of water quality is directly related to the safe operation of equipment. For the hydroelectric power station with large sediment content, besides using stainless steel material and welding nickel-based alloy to prevent abrasion in the over-flow position of pressure relief valve, the recoil blowdown device of the pressure reducing valve can also effectively prevent the blockage of the feedback control system, so that pressure relief valve can keep a good working condition in the water quality with lots of sediment and debris.(The recoil sewage system is standard equipped with manual control, according to the actual water quality to grasp the recoil sewage frequency, or directly use PLC automatic recoil sewage device.)
4. Working principle of outlet pressure locking of combined pressure reducing valve:
Each qualified pressure relief valve body has undergone more than 60 minutes of 1.5 times the strong pressure experiment, completely eliminate the valve body defects, even after more than ten years of continuous operation will not appear rupture leakage and other faults. The outlet pressure internal locking device is a rigid protection device to keep the outlet pressure P2 safe when the pressure is lost below the main piston after the feedback system suffers accidental damage.
The principle of
Principle of action: the pressure reducing valve is to reduce the water pressure by the local resistance of the flow channel in the valve. The range of water pressure drop is automatically adjusted by the film connecting the valve disc or the inlet and outlet water pressure difference on both sides of the piston. The principle of constant ratio decompression is to control the water pressure ratio of the floating piston in the valve body, and the decompression ratio of the inlet and outlet end is inversely proportional to the area ratio of the inlet and outlet side piston.The pressure reducing valve works smoothly without vibration; There is no spring in the valve body, so there is no spring corrosion, metal fatigue failure; Sealing performance is good and no leakage, so both dynamic pressure (water flow) and static pressure (flow rate is 0); Especially in the decompression at the same time does not affect the flow.
Working principle: pressure relief valve is a control valve open-close part of the opening in the body to adjust the flow of the medium, the medium pressure is reduced, at the same time with the aid of the role of the valve after pressure adjust the opening of open-close part, keep the valve after pressure within a certain range, and the valve body or valve after the injection of cooling water, reduce the temperature of medium, the valve is called desuperheating valve to relieve stress. The automatic selection of pressure reducing valve is fast and easy. The characteristic of the valve is to keep the outlet pressure and temperature value within a certain range under the condition of constant change of inlet pressure.
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