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Balanced sleeve valve introduction
Pressure relief valve is a self-regulating valve, which through the valve trim, the inlet pressure down to the desired outlet pressure. When the import pressure and flow changes, with the elastic element and the transmission medium to maintain its own outlet pressure is basically the same. Pressure reducing valve commonly used in China is generally a throttling, disc for the cone. A throttle valve at low pressure drop has a better effect, but easy to produce cavitation under high pressure drop leading to premature failure of the throttle. So often two or more pressure reducing valves are used in parallel, which increases the operating cost and instability of the system. In order to solve the problem of depressurization under high pressure, a two-stage throttling balance sleeve type pressure reducing valve was designed. Pressure relief valve according to the structure is divided into direct-acting membrane type, the direct role of bellows-type, pilot-film, pilot-style bellows and pilot-piston and so on. No matter what form of structure, are automatically balanced by the elastic element medium pressure so as to adjust the valve opening throttle throttling, in which the valve is the most central part of the valve, the design is reasonable or not directly affect the valve The use of performance. Reducing valve disc with two balance sleeve throttling structure of the middle of the sleeve valve disc to open the same area of ​​the orifice and the average of about 6, a throttle. Sleeve valve flap, the lower part of the opening of the same area of ​​the six orifice and the ring to the average distribution for the two throttle. Medium from the inlet valve through the valve into the middle of the throttle after a throttling throttled into the valve cylinder space, the cylindrical space, the same under the area, the upper and lower sleeve to withstand the liquid pressure offset each other to achieve Therefore, the throttling area is not affected by the change of inlet pressure. The medium then flows through the upper and lower orifice of the valve and then enters the outlet of the pressure reducing valve. Upper and lower 12 secondary orifice total area and the middle of six primary orifice the same total area, two similar throttling pressure, namely the total pressure relief valve total throttle pressure is basically equal distribution, control the flow speed. In addition, each of the upper, middle and lower throttles are evenly distributed in the circumferential direction, eliminating the lateral force. Two-stage throttling balanced sleeve valve has many advantages: ①can achieve two throttling, thus solving the pressure drop under high pressure drop problems, slow down the hydraulic impact, to avoid the cavitation occurs, reducing the noise, but also It can be adapted to reduce the pressure in the case of low pressure drop. ② Through the simple structure design, the valve keeps the balance in the horizontal direction and maintains the good balance in the vertical direction, which reduces the design and manufacturing cost. ③ valve lateral thrust balance, smooth steering, valve seat joint life increases, the structure optimization is reasonable. ④ the whole valve can be quickly removed to facilitate maintenance. ⑤ elastic components only correspond to the secondary throttling outlet pressure, can improve the pressure relief valve outlet pressure stability.