H61对夹式焊接止回阀的工作原理是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。H61对夹式焊接止回阀又称为逆流阀、逆止阀、背压阀、单向阀。这类阀门是靠管路中介质本身的流动产生的力而自动开启和关闭的，属于一种自动阀门。止回阀用于管路系统，其主要作用是防止介质倒流、防止泵及其驱动电机机反转，以及容器内介质的泄放。H61对夹式焊接止回阀是对夹后和管线焊接连接，该阀由1个主体和2个附体通过螺栓连接而成，具有安装方便 连接牢固 方便更换等优点。焊接形式又分为对焊和承插焊2种。用户可根据各自情况选购。

对夹式焊接止回阀

对夹式焊接止回阀是一种专为紧凑空间和高压工况设计的特殊阀门。它结合了对夹式止回阀的紧凑结构和焊接连接密封性。该阀门本身没有法兰，而是通过长螺栓将其“夹紧”在两个管道法兰之间，而其阀体上的焊接坡口则与两侧的管道直接进行对焊连接。

这种混合设计使其既能像对夹式阀门一样节省空间和重量，又能像焊接阀门一样实现长久、稳定的零泄漏连接，尤其适用于高压、高温或对泄漏要求极为苛刻的场合。其内部结构通常采用旋启式或碟式设计，依靠介质自身的流动和回流自动启闭。

对夹式焊接止回阀主要特点：

紧凑型设计： 结构长度短，体积小，重量轻，比同规格的法兰连接阀门节省大量空间。

对夹式焊接止回阀焊接连接： 提供了长久性的管道连接，彻底消除了法兰接头处的泄漏风险，密封性能远超法兰连接。

对夹式焊接止回阀高压力性能： 通常具有很高的压力等级，能承受系统的高压和压力波动。

对夹式焊接止回阀经济： 省去了一对配对法兰、螺栓和垫片，降低了材料和安装成本。

对夹式焊接止回阀安装便捷： 作为整个管系的一部分进行焊接安装，整体性强，稳定性好。

对夹式焊接止回阀典型应用：

石油天然气输送的高压主管线。

炼油厂、化工厂的高压工艺管道。

电站的高压蒸汽和给水系统。

船舶制造和海洋平台的关键管路系统。

任何需要节省空间且不允许泄漏的高压、高温场合。

Product Overview of Wafer-Style Welded Check Valves

Product Overview:

A wafer-style welded check valve is a specialized valve designed for compact spaces  high-pressure services. It combines the space-saving structure of a wafer check valve with the superior sealing of a welded connection. The valve itself has no flanges; instead, it is "clamped" between two pipeline flanges using long stud bolts, while its weld ends are directly butt-welded to the connecting pipes.

This hybrid design allows it to save space  weight like a wafer valve while achieving a permanent, reliable, zero-leakage connection like a welded valve. It is particularly suited for high-pressure, high-temperature,  applications with extremely stringent leakage requirements. Its internal design is typically swing  disc type, which opens  closes automatically based on the flow  reversal of the medium.

Key Features:

Compact Design: Short face-to-face dimensions, small volume,  light weight, saving significant space compared to flanged valves of the same specification.

Welded Connection: Provides a permanent pipeline connection,彻底消除了法兰接头处的泄漏风险，密封性能远超法兰连接。

High-Pressure Capability: Typically has a high pressure class rating, capable of withstanding system high pressure  pressure fluctuations.

Cost-Effectiveness: Eliminates the need for a pair of matching flanges, bolts,  gaskets, reducing material  installation costs.

Convenient Installation: Installed as an integral part of the piping system through welding, offering great integrity  stability.

Typical Applications:

High-pressure main lines in oil  gas transmission.

High-pressure process piping in refineries  chemical plants.

High-pressure steam  feedwater systems in power plants.

Critical piping systems in shipbuilding  offshore platforms.

Any high-pressure, high-temperature application  space is limited  leakage is unacceptable.

关键术语翻译 (Key Terminology Translation):

对夹式焊接止回阀: Wafer-Style Welded Check Valve / Welded Wafer Check Valve

对夹式: Wafer Style

焊接坡口: Weld End / Beveled End (for welding)

对焊: Butt Weld (BW)

长螺栓: Stud Bolts

管道法兰: Pipeline Flanges

旋启式: Swing Type

碟式: Disc Type (Double Disc / Wafer Type)

零泄漏: Zero Leakage

结构长度: Face-to-Face Dimension