E402止回阀

E402止回阀

E402止回阀是一种采用升降式（或称为旋启式，需根据具体结构确定）阀瓣设计的止回阀，其型号“E402”通常代表特定的产品系列或制造商的标准设计。该类阀门是一种自动阀门，其核心功能是允许流体单向流动，并有效防止介质倒流，从而避免对泵、压缩机等设备造成逆流损坏，保障管道系统的安全。

E402止回阀核心特点：

自动启闭：依靠介质自身的流动压力开启阀门（流体正向流动时），当流动停止或产生反向流动时，依靠阀瓣自重、弹簧力或介质回流压力自动关闭，无需外部操作机构。

防逆流保护：有效防止由于系统压力波动或泵停机而导致的介质反向流动，保护上游设备。

低水锤效应：优化的阀瓣设计（如带弹簧辅助关闭）可快速关闭，减少水锤现象（Water Hammer）的产生，降低对管道的冲击和噪声。

紧凑结构：结构长度短，体积小，安装空间要求低。常见连接方式包括螺纹连接、法兰连接等，E402系列通常以螺纹连接为主，适用于较小口径管道。

广泛适用性：阀体材质多样（如铸铁、碳钢、不锈钢），可适用于水、蒸汽、油品、腐蚀性介质等多种工作介质。

E402止回阀主要应用领域：

广泛应用于给排水系统、石油、化工、电力、暖通空调（HVAC）等行业的泵出口、压缩机出口以及其他需要防止介质倒流的管路上。

Product Overview of E402 Check Valve

English Version

The E402 Check Valve is a type of check valve designed with a lift-type ( swing-type, depending on the specific construction) disc. The model number "E402" typically represents a specific product series  a manufacturer's standard design. This type of valve is an automatic valve whose core function is to allow fluid flow in one direction only  effectively prevent backflow of the medium, thereby avoiding reverse flow damage to equipment such as pumps  compressors  ensuring the safety of the piping system.

Key Features:

Automatic Operation: The valve opens under the pressure of the flowing medium itself (during forward flow)  closes automatically—via the disc's own weight, spring force,  reverse flow pressure—when the flow stops  reverses. It requires no external actuation mechanism.

Backflow Prevention: Effectively prevents reverse flow of the medium caused by system pressure fluctuations  pump shutdown, protecting upstream equipment.

Low Water Hammer Potential: An optimized disc design (e.g., with spring-assisted closing) enables rapid closure, mitigating water hammer phenomena  reducing pipeline shock  noise.

Compact Construction: Features a short face-to-face dimension  small overall size, requiring minimal installation space. Common end connections include threaded  flanged, with the E402 series typically being threaded, suitable for smaller bore pipelines.

Broad Applicability: Available in various body materials (e.g., Cast Iron, Carbon Steel, Stainless Steel), making it suitable for a wide range of media including water, steam, oil,  corrosive substances.

Primary Application Fields:

Widely used at the outlets of pumps  compressors,  in other pipelines requiring prevention of media backflow in industries such as water supply  drainage, petroleum, chemical, power generation,  HVAC (Heating, Ventilation,  Air Conditioning).

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