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735S 压力波动预止阀 产品概述 Product overview of 735S pressure fluctuation pre-check valve
压力波动预止阀 是一种液压自动控制阀，它被设计用于减小由于水泵开启、关闭或断电而造成停泵时管道系统中所引起的压力波动，从而保护水泵管网系统。 735S pressure fluctuation pre-check valve is a hydraulic automatic control valve, which is designed to reduce the pressure fluctuation caused in the pipeline system when the pump is stopped due to the pump opening, closing or power failure, thereby protecting the pump pipe network system. Y 型阀体两种。 This valve is a pilot-operated, hydraulically-driven diaphragm control valve. There are two types of angle valve body and Y valve body. The opening and closing of the valve is driven by the pressure difference across the valve. The upper control chamber operates according to the two-way control principle. The main valve is controlled by adjusting the pilot valve and the pressure relief pilot valve. The lower control chamber is connected to the downstream pressure through a fixed small hole and acts as a buffer when closed.
，水流由于惯性作用，首先产生水柱分离 ( 趋势 ) ，引起系统压力下降，随后分离水柱发生弥合，两股分离水柱剧烈碰撞产生压力很高的弥合水锤，产生巨大的压力波动， 735 型压力波动预止阀的低压泄压导阀可感应到这种最初的压力下降，预先开启主阀，随后而来的弥合高压将主阀完全打开，泄放系统高压，从而起预防水锤的功能，高压导阀感应高压力波，同样会开启主阀，并使主阀保持开启状态，液压或机械的流量控制器可限制阀门的开启，这一装置有效地控制了压力波动，并保证主阀及时关闭不产生额外的系统压力损失，当系统高压降低到接近于设定值时，高泄压导阀关闭，主阀上控制腔中的压力随之增加，主阀关闭，系统中的压力恢复至正常工况。 Suddenly stop the pump . Due to the inertia of the water flow, the water column separation ( trend ) first occurs , causing the system pressure to drop, and then the separation water column is closed. The two separated water columns collide violently to generate a high-pressure closed water hammer, which generates huge pressure fluctuations. 735 The low-pressure relief pilot valve of the type pressure fluctuation pre-check valve can sense this initial pressure drop, open the main valve in advance, and then close the high pressure to fully open the main valve and release the high pressure of the system to prevent water hammer. Function, high pressure pilot valve senses high pressure wave, it will also open the main valve and keep the main valve open. Hydraulic or mechanical flow controller can limit the opening of the valve. This device effectively controls pressure fluctuations and ensures that the main valve The valve is closed in time without generating additional system pressure loss. When the system high pressure is reduced to close to the set value, the high pressure relief pilot valve is closed, the pressure in the control chamber on the main valve is increased, and the main valve is closed. Return to normal working conditions.
" 2 " ，高压泄压导阀上标有数字 " 3 " ，高压、低压泄压导阀上都装有调节螺钉，以分别设定低压 / 高压泄压值，由针阀控制主阀关闭速度。 In order to facilitate the distinction between high and low pressure relief pilot valves, the number " 2 " is marked on the low pressure relief pilot valve, the number " 3 " is marked on the high pressure relief pilot valve , and the high pressure and low pressure relief pilot valves are equipped with adjustments. Screw to set the low / high pressure relief value separately, and the closing speed of the main valve is controlled by the needle valve.
而维持预设的最大系统压力的 功能。 In addition to preventing pressure fluctuations, the 735S pressure fluctuation check valve also has the function of exhausting excessive pressure to the atmosphere while maintaining a preset maximum system pressure . 压 泄压导阀的设定值 ， 高 压 泄压导阀开启，主阀 上控制腔中的压力减小 ， 主阀开启使系统泄压，从而维持系统的预设压力值，系统压力降低到泄压导阀设定值，导阀将关闭，主阀上控制腔中的压力会增加并缓慢关闭以维持预设系统压力值。 When the system pressure exceeds the set value of the high- pressure relief pilot valve , the high- pressure relief pilot valve opens, the pressure in the control chamber on the main valve decreases , and the main valve opens to release the system pressure, thereby maintaining the system's preset pressure value The system pressure is reduced to the set value of the pressure relief pilot valve, the pilot valve will be closed, and the pressure in the control chamber on the main valve will increase and slowly close to maintain the preset system pressure value.
DN400-DN600 阀门控制腔上装有 DN50 的阀门以提高主阀开启速度。 Note: DN400-DN600 valve control chamber is equipped with a DN50 valve to increase the opening speed of the main valve.
735S 压力波动预止阀 主要零部件材料表 Material list of main components of 735S pressure fluctuation check valve
Copper alloy, stainless steel
735S 压力波动预止阀 主要性能参数表 Third, 735S pressure fluctuation pre-stop valve main performance parameter table
Nominal pressure PN (MPa)
Shell test pressure (MPa)
Sealing test pressure (MPa)
Minimum operating pressure (MPa)
Slow closing time (S)
0 ~ 80 ° C
735S 压力波动预止阀 主要外型尺寸表 Fourth, 735S pressure fluctuation pre-check valve main size table
(mm) Size (mm)
735S 压力波动预止阀 主要结构图 Five, 735S pressure fluctuation pre-check valve main structure diagram
respected user! ，更多 水力控制阀 相关产品介绍请浏览： http://gccshows.com/ 。 If you need to order pressure fluctuation check valve products from our factory, please indicate the inlet and outlet pressure, nominal diameter, valve body material, etc. for selection when consulting. Sales department order, please contact our sales technicians for details, please contact mobile phone: 13816357694. For more information about hydraulic control valve , please visit: http://gccshows.com/ .
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