H12X内外螺纹单向阀又称为逆流阀、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。焊接式单向阀只允许介质向一个方向流动，而且阻止方向流动。

       公称压力：PN2.5 PN4 PN6.4 PN16 PN40Mpa
       公称通径：DN5～DN125
       适用介质：油﹑水﹑气等多种非腐蚀性或腐蚀性介质
       适用温度：-20℃～+440℃ -70℃～-240℃ ≤540℃ ≤570℃等
       制造材料：20#﹑1Cr18Ni9Ti﹑304﹑316﹑316L﹑12Cr1Mov等

H12X内外螺纹单向阀

H12X内外螺纹单向阀，也称为逆流阀、逆止阀或背压阀，是一种自动阀门 。它依靠管路中介质本身的流动产生的力自动开启和关闭，用于防止介质倒流、防止泵及驱动电机反转，以及容器内介质的泄放 。此阀门只允许介质向一个方向流动 。

H12X内外螺纹单向阀阀门具有结构紧凑、密封稳定、启闭迅速的特点。其内外螺纹的连接方式使安装较为方便。根据搜索结果，它广泛应用于水、油、气等多种介质的管路系统 。

以下是H12X内外螺纹单向阀主要技术规格总结

项目 规格

产品名称 H12X内外螺纹单向阀

别称 逆流阀、逆止阀、背压阀、单向阀

连接方式 内外螺纹

公称压力 (PN) 2.5, 4, 6.4, 16, 40 Mpa

公称通径 (DN) 5 ~ 125 mm

适用介质 油、水、气等多种非腐蚀性或腐蚀性介质

适用温度 约 -20℃ 至 +440℃；另有型号显示工作温度 ≤100℃

阀体材料 20#、1Cr18Ni9Ti、304、316、316L、12Cr1Mov 等

H12X内外螺纹单向阀工作原理 介质顺流时自动开启，介质停止或逆流时自动关闭

H12X内外螺纹单向阀

Product Overview of H12X Internal  External Thread Check Valve

The H12X Internal  External Thread Check Valve, also known as a reverse flow valve, non-return valve,  back pressure valve, is a type of automatic valve . It automatically opens  closes using the force generated by the fluid's own flow in the pipeline, primarily used to prevent backflow of media, prevent reverse rotation of pumps  their driving motors,  for the release of media  containers . This valve only allows media to flow in one direction .

This valve features a compact structure, reliable sealing,  rapid opening  closing. Its internal  external thread connection design makes installation relatively convenient. According to search results, it is widely used in pipeline systems for various media including water, oil,  gas .

Below is a summary of its main technical specifications based on available information (Please note that some parameters may vary depending on the specific model  manufacturer):

Item Specification

Product Name H12X Internal  External Thread Check Valve

Other Names Reverse Flow Valve, Non-return Valve, Back Pressure Valve, Check Valve

Connection Type Internal  External Thread

Nominal Pressure (PN) 2.5, 4, 6.4, 16, 40 Mpa

Nominal Diameter (DN) 5 ~ 125 mm

Applicable Media Oil, water, gas,  various non-corrosive  corrosive media

Applicable Temperature Approx. -20℃ to +440℃; other models indicate an operating temperature ≤100℃

Body Material 20#, 1Cr18Ni9Ti, 304, 316, 316L, 12Cr1Mov, etc.

Working Principle Opens automatically under forward media flow; closes automatically when media stops  reverses flow