在工业管道系统中，介质倒流是引发设备损坏、工艺紊乱甚至安全事故的常见隐患。止回阀就是专门防止这种“逆行者”的“单向阀门”——它允许介质正向流动，一旦出现倒流趋势立即自动关闭。良工阀门集团的止回阀产品线覆盖了从普通给排水到核电、军工的出众应用。

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、止回阀的工作原理与类型

1、 Working principle and types of check valves

止回阀又称单向阀或逆止阀，其工作原理是利用介质自身的流动动力来开启或关闭阀瓣。当介质正向流动时，阀瓣被推开；当介质停止或倒流时，阀瓣在自重和回流压力作用下自动关闭，切断通道。

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.

良工止回阀的主流类型包括：

The mainstream types of Lianggong check valves include:

旋启式止回阀（H44W-16RL） ——阀瓣绕销轴旋转，流阻小，适合大口径管道。

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

升降式止回阀（H41W-25R） ——阀瓣沿阀体垂直中心线升降，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.

蝶式止回阀——阀瓣为圆盘状，结构紧凑，适合给排水系统。

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

消声止回阀——内置缓闭装置，有效消除水锤噪音。

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

橡胶瓣止回阀——阀瓣为橡胶材质，密封性能优异。

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

二、良工止回阀的型号解读与技术参数

2、 Interpretation and Technical Parameters of Lianggong Check Valve Models

H42W-16P DN200——升降式止回阀，法兰连接，密封面由阀体材料直接加工，公称压力1.6MPa，阀体材质为不锈钢（P），口径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——旋启式止回阀，法兰连接，阀体材质为不锈钢（RL，含钼不锈钢），公称压力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——升降式止回阀，公称压力2.5MPa，材质为不锈钢。

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

三、止回阀选型的5个关键考量

3、 5 key considerations for selecting check valves

1. 安装位置——水平管道和垂直管道对止回阀的类型有不同要求。

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

2. 介质特性——清洁介质与含固体颗粒的介质需选用不同类型的阀瓣结构。

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

3. 流速与压降——旋启式止回阀流阻小，适合大口径；升降式止回阀流阻大，适合小口径。

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. 水锤防护——需防止水锤的场合应选用带缓闭装置的消声止回阀。

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

5. 材质匹配——常规工况用碳钢，腐蚀性介质用不锈钢。

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

四、止回阀的常见故障与处理

4、 Common faults and solutions of check valves

止回阀非常常见的故障是阀瓣卡阻和密封失效。阀瓣卡阻通常由介质中的杂质引起，需定期清洗检查。密封失效表现为倒流，需检查密封面是否磨损或有异物。安装时应注意介质流向与阀体箭头方向一致。

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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