在工業(yè)管道系統(tǒng)中，介質(zhì)倒流是引發(fā)設(shè)備損壞、工藝紊亂甚至安全事故的常見隱患。止回閥就是專門防止這種“逆行者”的“單向閥門”——它允許介質(zhì)正向流動，一旦出現(xiàn)倒流趨勢立即自動關(guān)閉。良工閥門集團(tuán)的止回閥產(chǎn)品線覆蓋了從普通給排水到核電、軍工的出眾應(yīng)用。

In industrial pipeline systems, medium backflow is a common hazard that can cause equipment damage, process disruption, and even safety accidents. A check valve is a "one-way valve" specifically designed to prevent this type of "reverse flow" - it allows the medium to flow forward and automatically closes once there is a reverse flow trend. The check valve product line of Lianggong Valve Group covers high-end applications from ordinary water supply and drainage to nuclear power and military industry.

一、止回閥的工作原理與類型

1、 Working principle and types of check valves

止回閥又稱單向閥或逆止閥，其工作原理是利用介質(zhì)自身的流動動力來開啟或關(guān)閉閥瓣。當(dāng)介質(zhì)正向流動時，閥瓣被推開；當(dāng)介質(zhì)停止或倒流時，閥瓣在自重和回流壓力作用下自動關(guān)閉，切斷通道。

Check valve, also known as one-way valve or check valve, works by utilizing the flow power of the medium itself to open or close the valve disc. When the medium flows forward, the valve disc is pushed open; When the medium stops or flows back, the valve disc automatically closes under its own weight and reflux pressure, cutting off the channel.

良工止回閥的主流類型包括：

The mainstream types of Lianggong check valves include:

旋啟式止回閥（H44W-16RL） ——閥瓣繞銷軸旋轉(zhuǎn)，流阻小，適合大口徑管道。

Swing check valve (H44W-16RL) - the valve disc rotates around the pin axis, with low flow resistance, suitable for large-diameter pipelines.

升降式止回閥（H41W-25R） ——閥瓣沿閥體垂直中心線升降，密封性好。

Lift check valve (H41W-25R) - the valve disc lifts and lowers along the vertical centerline of the valve body, with good sealing performance.

蝶式止回閥——閥瓣為圓盤狀，結(jié)構(gòu)緊湊，適合給排水系統(tǒng)。

Butterfly check valve - The valve disc is disc-shaped, compact in structure, and suitable for water supply and drainage systems.

消聲止回閥——內(nèi)置緩閉裝置，有效消除水錘噪音。

Silencing check valve - built-in slow closing device, effectively eliminating water hammer noise.

橡膠瓣止回閥——閥瓣為橡膠材質(zhì)，密封性能優(yōu)異。

Rubber Disc Check Valve - The valve disc is made of rubber material and has excellent sealing performance.

二、良工止回閥的型號解讀與技術(shù)參數(shù)

2、 Interpretation and Technical Parameters of Lianggong Check Valve Models

H42W-16P DN200——升降式止回閥，法蘭連接，密封面由閥體材料直接加工，公稱壓力1.6MPa，閥體材質(zhì)為不銹鋼（P），口徑200mm。

H42W-16P DN200- Lift check valve, flange connection, sealing surface directly processed from valve body material, nominal pressure 1.6MPa, valve body material stainless steel (P), diameter 200mm.

H44W-16RL DN150——旋啟式止回閥，法蘭連接，閥體材質(zhì)為不銹鋼（RL，含鉬不銹鋼），公稱壓力1.6MPa。

H44W-16RL DN150- Swing check valve, flange connection, valve body material is stainless steel (RL, including molybdenum stainless steel), nominal pressure is 1.6MPa.

H41W-25R DN15——升降式止回閥，公稱壓力2.5MPa，材質(zhì)為不銹鋼。

H41W-25R DN15- Lift check valve, nominal pressure 2.5MPa, made of stainless steel.

三、止回閥選型的5個關(guān)鍵考量

3、 5 key considerations for selecting check valves

1. 安裝位置——水平管道和垂直管道對止回閥的類型有不同要求。

1. Installation position - Horizontal and vertical pipelines have different requirements for the type of check valve.

2. 介質(zhì)特性——清潔介質(zhì)與含固體顆粒的介質(zhì)需選用不同類型的閥瓣結(jié)構(gòu)。

2. Medium characteristics - Different types of valve disc structures should be selected for cleaning media and media containing solid particles.

3. 流速與壓降——旋啟式止回閥流阻小，適合大口徑；升降式止回閥流阻大，適合小口徑。

3. Flow rate and pressure drop - Rotary check valves have low flow resistance and are suitable for large diameters; The lift check valve has high flow resistance and is suitable for small diameters.

4. 水錘防護(hù)——需防止水錘的場合應(yīng)選用帶緩閉裝置的消聲止回閥。

4. Water hammer protection - In situations where water hammer prevention is required, soundproof check valves with slow closing devices should be selected.

5. 材質(zhì)匹配——常規(guī)工況用碳鋼，腐蝕性介質(zhì)用不銹鋼。

5. Material matching - carbon steel is used for conventional working conditions, and stainless steel is used for corrosive media.

四、止回閥的常見故障與處理

4、 Common faults and solutions of check valves

止回閥非常常見的故障是閥瓣卡阻和密封失效。閥瓣卡阻通常由介質(zhì)中的雜質(zhì)引起，需定期清洗檢查。密封失效表現(xiàn)為倒流，需檢查密封面是否磨損或有異物。安裝時應(yīng)注意介質(zhì)流向與閥體箭頭方向一致。

The most common faults of check valves are valve disc jamming and sealing failure. Valve disc jamming is usually caused by impurities in the medium and requires regular cleaning and inspection. Sealing failure manifests as backflow, and it is necessary to check whether the sealing surface is worn or has foreign objects. During installation, it should be noted that the flow direction of the medium should be consistent with the direction of the arrow on the valve body.

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