蝶片式止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依重心旋转）、升降式止回阀（沿轴线移动）、蝶片式止回阀（沿中心旋转）。
Butterfly disc check valve is a valve that automatically opens and close valve discs depending on the flow of the medium itself, and it is also used to prevent the backflow of the medium. It is also called the check valve, check valve, counterflow valve and back pressure valve. Check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, prevent the reversal of the pump and drive motor, and the discharge of the container medium. The check valve can also be used to provide a supply line for the pressure in which the pressure may be raised above the system pressure auxiliary system. The check valves can be mainly divided into rotary check valves (center of gravity rotation), lifting check valves (moving along the axis), butterfly disc check valves (along the center).
作用
蝶片式止回阀的作用是只允许介质向一个方向流动，而且阻止方向流动。通常这种阀门是自动工作的，在一个方向流动的流体压力作用下，阀瓣打开；流体反方向流动时，由流体压力和阀瓣的自重合阀瓣作用于阀座，从而切断流动。
Effect
The function of a butterfly check valve is to allow only the medium to flow in one direction, and to prevent the flow of direction. Usually, the valve is automatically operated. Under the action of a fluid pressure flowing in one direction, the valve flap opens. When the fluid flows backward, the flow pressure and the self closing valve of the disc are acting on the valve seat to cut off the flow.
碟片式止回阀DISC CHECK VALVE
主要零件的材料Material for the main parts：
零件名称 Part name 阀体、阀盖、 阀瓣 Valve body, valve cover, valve disc 密封面 Sealing surface 摇杆 rocker 销轴 Pin shaft 垫片 Shim 零件材料 Part material 碳钢 carbon steel 堆焊硬质合金 Hardfacing hard alloy 碳钢 carbon steel 铬不锈钢 Chromium stainless steel 柔性石墨+304 Flexible graphite+304
技术参数Technical parameter
| 公称通径Nominal path | DN(mm) | 40～800 |
| 公称压力Nominal pressure | PN(Mpa） | 1.0～2.5 |
| 缓闭时间Slow closing time | 3～60s |
|
| 适用介质Applicable medium | 清水、污水、海水 |
|
| 适用温度Applicable temperature | 0～80℃ |
|
零件材料Part material
| 名称Name | 材料Material |
| 阀体Valve body | 灰铸铁、铸钢、不锈钢等Grey cast iron, cast steel, stainless steel, etc |
| 阀盖Valve cover | 钢板、不锈钢Steel plate、 stainless steel |
| 阀瓣Valve clack | 丁腈橡胶NBR |
| 阀轴Valve shaft | 不锈钢Stainless steel |
外型尺寸和重量/Prime out-form dimensions and weigh
| 产品型号 Product model | 外径 External diameter | 内径 Internal diameter | 厚度 Thickness | 重量 weight |
|
|
| 14.2CM | 3.5CM | 1.9CM | 2.1KG |
|
安装事项
止回阀的安装应注意以下事顶：
1、在管线中不要使止回阀承受重量，大型的止回阀应独立支撑，使之不受管系产生的压力的影响。
2、安装时注意介质流动的方向应与阀体所票箭头方向一致。
3、升降式垂直瓣止回阀应安装在垂直管道上。
4、升降式水平瓣止回阀应安装在水平管道上
Installation matters
The installation of the check valve should be paid attention to the following:
1. Do not bear the weight of the check valve in the pipeline. The large check valve should be supported independently so that it is not affected by the pressure produced by the pipe system.
2. When installing, the direction of the flow of the medium should be in accordance with the direction of the valve.
3. The lifting type vertical valve should be installed on the vertical pipe.
4. The lift horizontal valve check valve should be installed on the horizontal pipe
安装和使用
1、本阀门通路两端须堵塞，存在干燥通风的室内。如长期存放，应经常检查防锈蚀。
2、安装前应将阀门清洗干净，并消除在运输过程中造成的缺陷。
3、安装时必须仔细核对阀门上的标志和铭牌是否符合使用要求。
4、本阀门安装在水平管道上，阀盖向上。
Installation and use
1, the valves at both ends of the valve must be blocked, and there is a dry and ventilated room. Corrosion protection should be regularly checked for long-term storage.
2, before installation, the valve should be cleaned and the defects caused in the transportation process are eliminated.
3, the installation must carefully check the sign on the valve and whether the nameplate is in accordance with the requirements.
4. The valve is installed on the horizontal pipe and the valve cover is upwards.
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