产品描述 Product Description

进口缓闭、缓冲蝶式止回阀是一种双偏心蝶式止回阀，带缓冲（或缓闭）阻尼油缸装置，用延缓关闭的方式使局部倒流水向系统内泄流，从而大大降低了停泵时的水击冲力，消除了破坏性水锤峰值。在设计上充分考虑了使用环境的要求达到无震动，无噪音的效果，密封性能好，运行平稳，并具节能效果好。

The imported slow closing and buffering butterfly check valve is a double eccentric butterfly check valve with a buffering (or slow closing) damping oil cylinder device. It uses a delayed closing method to allow local backflow water to flow into the system, greatly reducing the water hammer force during pump shutdown and eliminating destructive water hammer peaks. Fully considering the requirements of the operating environment in the design, achieving a vibration free and noise free effect, good sealing performance, smooth operation, and good energy-saving effect

主要技术性能（Main technical feature）

工作原理 Working principle


1.阀门的开启是靠阀门进出口端的压差来实现的。当停泵时，阀瓣依靠回水压力和阀瓣自身的重力及重锤的作用迅速关闭大部分行程。然后，由阻尼油缸来实现阀门的缓慢关闭。从而达到缓闭、缓冲、消除水击冲力的效果。


   The opening of the valve is realized by the pressure difference between the inlet and exit of the valve. When the pump is stopped, the disc quickly closes most of the stroke by the return pressure and the gravity of the disc itself and the heavy hammer. Then, the valve closes slowly by the damping cylinder. So as to achieve the slow closing, buffer, eliminate the effect of water impact force.

2.阻尼油缸上的调节阀是用来调节阀门关闭时间长短的。顺时针旋转，表示延长关闭时间；反之则缩短关闭时间。

   The regulating valve on the damping cylinder is used to adjust the closing time of the valve. Rotate clockwise to indicate the closure time; otherwise

关阀特性
 Valve closing characteristics

水泵正常或事故停泵时，本系列产品，分快、慢两个阶段自动关阀 When the water pump stops normally or in an accident, this series of products automatically closes the valve in two stages: fast and slow


快关阶段：蝶板在相关力矩及倒流水作用下快速关阀约80%-85%（可调）角行程，截断大量倒流水 Quick closing stage: Under the action of relevant torque and backflow, the butterfly plate quickly closes the valve by about 80% -85% (adjustable) of the angular stroke, cutting off a large amount of backflow

慢关阶段：快关阶段结束，由缓闭装置油缸中预先设定的节流元件进行节流。
Slow closing stage: The fast closing stage ends and is throttled by the pre-set throttling element in the slow closing device oil cylinder

开始慢关；节流元件为双节流结构，节流面积随关阀过程蝶板角行程位移而变文学，缓闭性能良好。Start slow closing; The throttling element adopts a dual throttling structure, and the throttling area varies with the angular displacement of the butterfly plate during the valve closing process, resulting in good slow closing performance

节流元件为可调可换式，可根据不同工况需要进行调整或者更换。The throttling element is adjustable and replaceable, which can be adjusted or replaced according to different working conditions

本系列产品若阀座为倾斜式，则倾斜角度为12度，因此全关位置为12度 If the valve seat of this series of products is inclined, the inclination angle is 12 degrees, so the fully closed position is 12 degrees

流量特性、流阻特性 Flow characteristics Flow resistance characteristics

本系列产品，运用流体力学原理对与流量特性、流阻特性相关的阀腔过流截面进行了合理设计，流体过流截面大，流阻小，节能。

This series of products use the principle of fluid mechanics to reasonably design the valve cavity flow section related to flow characteristics and flow resistance characteristics. The flow section is large, flow resistance is small, and energy saving

流阻系数K与阀门开启角度关系曲线 Relationship curve between flow resistance coefficient K and valve opening angle

主要零件材质 Structure and main component materials

安装示意图 installation diagram