A pilot diaphragm type pressure reducing valve with adjustable pressure

Abstract

The invention relates to the technical field of pressure reducing valves, in particular to a pressure-adjustable pilot diaphragm type pressure reducing valve, comprising a valve casing, a shut-off component and a diaphragm. The partition that separates the two flow channels, the valve shell is also provided with a transition cavity and a balance cavity, the transition cavity is located in the middle of the valve shell, the balance cavity is located on the side of the transition cavity away from the inlet flow channel, and an overflow is set in the middle of the partition. A gate groove is set in the wall thickness of the partition plate, one end of the shut-off component is located in the gate groove, the other end of the shut-off component passes through the transition cavity and is connected to the diaphragm at the end, the outer edge of the diaphragm is connected to the inner wall of the valve shell, the diaphragm and the shut-off The ends of the components jointly separate the transition cavity and the balance cavity. The interception component controls the flow area of ​​the flow hole to adjust the flow resistance of the inflow channel and the outflow channel. The side of the gate groove away from the transition cavity is connected to the inflow A pressure-inducing hole is set between the channels, and the balance chamber is filled with the overflow medium of the pressure reducing valve, so that the pressure of the outlet channel is accurately maintained at the design value.

Description

technical field [0001] The invention relates to the technical field of pressure reducing valves, in particular to a pilot diaphragm type pressure reducing valve with adjustable pressure. Background technique [0002] The pressure reducing valve is a variety of valve, and its main function is to maintain the valve outlet pressure at a stable value. [0003] The current pressure reducing valve is roughly divided into film type, lever type, piston type, bellows type, etc. according to the structure, and can be divided into spring direct-acting type and pilot differential pressure type according to the principle of action. Smaller size is widely used to obtain narrower pressure fluctuation range. [0004] The current pilot-operated pressure reducing valve generally judges the pressure fluctuation of the inlet water flow by the pressure difference between the inlet and outlet. In a stable state, if the inlet pressure increases, the overcurrent flow will increase slightly, and th...

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Problems solved by technology

[0004] The current pilot-operated pressure reducing valve generally judges the pressure fluctuation of the inlet water flow through the pressure difference between the inlet and outlet. In a stable state, if the inlet pressure increases, the overcurrent flow will increase slightly, and the outlet pressure will also increase. However, the increase of the outlet pressure will not be as high as the increase of the inlet pressure, and the pressure difference between the inlet and outlet will expand. At this time, adjust the cross-section size of the pressure reducing valve to increase the flow resistance, so that the inlet pressure will experience a greater pressure drop. Outflow pressure, it is expected that the outflow pressure will return to the initial value, but this adjustment process cannot accurately know whether the outflow pressure returns to the initial value, it can only make the outflow pressure return to a state point slightly deviated from the initial value, the valve is in During manufacture, the adjustment ratio of the overflow opening is adjusted according to the design flow rate, which can obtain greater pressure reduction adjustment accuracy under the design flow rate. attenuation

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