静音止回阀
Silent check valve
工作原理
此静音止回阀主要由阀体、阀瓣、导流体、弹簧等组成。阀体材质为球铁(QT450_10),阀瓣导流体为包胶(丁睛橡胶)。其工作原理如下：
在没有介质流过阀体时，阀瓣在弹簧弹力的作用下，总处于关闭状态。阀瓣的开启和关闭及开启度的大小主要决定于阀门进口端与出口端之间的压力差。
如果进口端的压力大于出口端压力与弹簧弹力的总和时，阀瓣开启。只要有压力差存在，阀瓣则一直处于开启状态，同进压力差的大小也决定了阀瓣开启度的大小。如果出口端压力与弹簧弹力的总和大于进口端压务时，阀瓣则关闭且一直处于关闭状态。由于阀瓣的开启和关闭是处于一个动态的力平衡系统中，不管进口端的介质压力变化如何，此阀动行平稳，且无噪音、安全故障少。
Working principle
The silent check valve is mainly composed of a valve body, a valve disc, a flow guide body, a spring, etc. The body material is ductile iron (QT450_10), and the disc guide body is covered with rubber (butadiene rubber). It works as follows:
When there is no medium flowing through the valve body, the disc is always closed under the action of the spring force. The opening and closing of the valve disc and the size of the opening degree are mainly determined by the pressure difference between the inlet and outlet of the valve.
If the pressure at the inlet is greater than the sum of the pressure at the outlet and the spring force, the disc opens. As long as there is a pressure difference, the valve disc is always in the open state, and the size of the pressure difference also determines the size of the valve disc opening degree. If the sum of the outlet pressure and spring force is greater than the inlet pressure, the disc is closed and remains closed. Since the opening and closing of the valve disc is in a dynamic force balance system, regardless of the medium pressure change at the inlet end, the valve moves smoothly, and there is no noise and less safety failure.
用途和性能特点
该静音止回阀主要适用于供水、排水系统消防管道系统，农业灌溉系统等。此阀安装于水泵出口处，以防止介质倒流而产生破坏性水能，保护水泵和管道其它设备。其阀的主要性能特点如下：
1、阀体内部水流通路采用流线型设计，水头损失少
2、阀瓣关闭行程短，能实现阀门的快速关闭，且运行平衡、无震动、无噪音、安全、极少有故障
3、结构合理、密封性能好
4、耐磨损，使用寿命长
Usage and performance characteristics
The silent check valve is mainly suitable for water supply, drainage system, fire pipe system, agricultural irrigation system, etc. The valve is installed at the outlet of the pump to prevent the destructive water energy caused by the backflow of the medium and protect the pump and other equipment of the pipeline. The main performance characteristics of the valve are as follows:
1, the internal flow path of the valve body adopts streamlined design, and the water head loss is less
2, the valve flap closing stroke is short, can realize the rapid closure of the valve, and the operation is balanced, no vibration, no noise, safety, rarely failure
3, reasonable structure, good sealing performance
4, wear resistance, long service life
性能规范
Performance specification
主要外形、连接尺寸和结构尺寸
Main dimensions, connection dimensions and structural dimensions
