Steam pressure reducing valve classification use, working principle

January 30, 2021

Steam pressure reducing valve according to the structure can be divided into diaphragm type, spring film type, piston type, lever type and bellows type; according to the number of seats can be artificial single seat type and double seat type; according to the valve position can be different Divided into positive action and reaction.
There are many kinds of pressure reducing valves, common ones are: pilot piston pressure reducing valve, diaphragm pressure reducing valve, bellows type pressure reducing valve, proportional pressure reducing valve, self-operated pressure reducing valve, direct acting piston pressure reducing valve Back pressure regulators, etc. They are suitable for different working media.
Steam Relief Valves Use Pressure Reducing Valves are smart valves that use the power of the media to regulate and control line pressure. For domestic water supply, fire-fighting water supply and other industrial water supply systems, the outlet pressure of the main valve can be adjusted by adjusting the valve decompression guide valve. The outlet pressure is not changed due to changes in the inlet pressure and the inlet flow rate, and the outlet pressure is maintained in the set and planted position safely and reliably, and the set value can be adjusted to achieve the purpose of decompression as required. The valve has accurate decompression, stable performance, safety and reliability, convenient installation and adjustment, and long service life.
The pressure reducing valve mainly controls the fixed outlet pressure of the main valve. The outlet pressure of the main valve is not changed due to the change of the inlet pressure. It does not change the outlet pressure due to the change of the outlet flow of the main valve, and has the effect of improving the system operating conditions and the potential water saving effect. According to statistics, its water-saving effect is about 30%. Suitable for industrial water supply, fire-fighting water supply and domestic water pipe network systems. Widely used in high-rise buildings, urban water supply network areas with high water pressure, mines and other occasions to ensure that the water supply system for each point of use to obtain appropriate service pressure and flow.
The working principle of the steam pressure reducing valve The pressure reducing valve is used to reduce the inlet pressure to a certain required outlet pressure through the throttling of the opening and closing parts, and keeps the outlet pressure stable. When the pressure reducing valve is delivered from the factory, the adjusting spring is in an uncompressed state. At this time, the main valve flap and the paying valve flap are in a closed state. When in use, the adjusting screw is turned clockwise, the adjusting spring is compressed, and the membrane flap is moved to open and pays the valve flap. From a hole through the valve seat to the b hole into the piston above the piston under the pressure of the media, the downward movement of the main valve to move away from the main valve seat, so that the media flow to the valve. At the same time from the c hole into the diaphragm below, when the pressure after the valve exceeds the set pressure, push the diaphragm to move the compression adjustment spring, pay the valve along with the closed direction to move, so that the medium above the flow of the piston decreases, the pressure is also with The drop, at this time the main valve flap in the main valve spring force to move up and down, so that the main valve flap and the main valve seat to reduce the gap, the media flow is also reduced, so that the valve pressure is also reduced to The new balance, conversely when the valve after the pressure is lower than the set pressure, the gap between the main valve and the main valve seat increases, the media flow also increases, so that the pressure behind the valve will also increase to reach a new balance.

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