蝶片式止回閥是指依靠介質(zhì)本身流動而自動開、閉閥瓣，用來防止介質(zhì)倒流的閥門，又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥屬于一種自動閥門，其主要作用是防止介質(zhì)倒流、防止泵及驅(qū)動電動機反轉(zhuǎn)，以及容器介質(zhì)的泄放。止回閥還可用于給其中的壓力可能升至超過系統(tǒng)壓的輔助系統(tǒng)提供補給的管路上。止回閥主要可分為旋啟式止回閥（依重心旋轉(zhuǎn)）、升降式止回閥（沿軸線移動）、蝶片式止回閥（沿中心旋轉(zhuǎn)）。
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
蝶片式止回閥的作用是只允許介質(zhì)向一個方向流動，而且阻止方向流動。通常這種閥門是自動工作的，在一個方向流動的流體壓力作用下，閥瓣打開；流體反方向流動時，由流體壓力和閥瓣的自重合閥瓣作用于閥座，從而切斷流動。
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.
碟片式止回閥DISC CHECK VALVE
主要零件的材料Material for the main parts：
零件名稱 Part name 閥體、閥蓋、 閥瓣 Valve body, valve cover, valve disc 密封面 Sealing surface 搖桿 rocker 銷軸 Pin shaft 墊片 Shim 零件材料 Part material 碳鋼 carbon steel 堆焊硬質(zhì)合金 Hardfacing hard alloy 碳鋼 carbon steel 鉻不銹鋼 Chromium stainless steel 柔性石墨+304 Flexible graphite+304
技術(shù)參數(shù)Technical parameter
| 公稱通徑Nominal path | DN(mm) | 40～800 |
| 公稱壓力Nominal pressure | PN(Mpa） | 1.0～2.5 |
| 緩閉時間Slow closing time | 3～60s |
|
| 適用介質(zhì)Applicable medium | 清水、污水、海水 |
|
| 適用溫度Applicable temperature | 0～80℃ |
|
零件材料Part material
| 名稱Name | 材料Material |
| 閥體Valve body | 灰鑄鐵、鑄鋼、不銹鋼等Grey cast iron, cast steel, stainless steel, etc |
| 閥蓋Valve cover | 鋼板、不銹鋼Steel plate、 stainless steel |
| 閥瓣Valve clack | 丁腈橡膠NBR |
| 閥軸Valve shaft | 不銹鋼Stainless steel |
外型尺寸和重量/Prime out-form dimensions and weigh
| 產(chǎn)品型號 Product model | 外徑 External diameter | 內(nèi)徑 Internal diameter | 厚度 Thickness | 重量 weight |
|
|
| 14.2CM | 3.5CM | 1.9CM | 2.1KG |
|
安裝事項
止回閥的安裝應(yīng)注意以下事頂：
1、在管線中不要使止回閥承受重量，大型的止回閥應(yīng)獨立支撐，使之不受管系產(chǎn)生的壓力的影響。
2、安裝時注意介質(zhì)流動的方向應(yīng)與閥體所票箭頭方向一致。
3、升降式垂直瓣止回閥應(yīng)安裝在垂直管道上。
4、升降式水平瓣止回閥應(yīng)安裝在水平管道上
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
安裝和使用
1、本閥門通路兩端須堵塞，存在干燥通風的室內(nèi)。如長期存放，應(yīng)經(jīng)常檢查防銹蝕。
2、安裝前應(yīng)將閥門清洗干凈，并消除在運輸過程中造成的缺陷。
3、安裝時必須仔細核對閥門上的標志和銘牌是否符合使用要求。
4、本閥門安裝在水平管道上，閥蓋向上。
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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