内螺纹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。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

H11X内螺纹单向阀

H11X内螺纹单向阀，也称为内螺纹止回阀或逆止阀，是一种依靠管路中介质自身流动产生的力来自动开启和关闭的自动阀门。它的主要作用是防止介质倒流、防止泵及驱动电机反转，以及保障容器内介质的密封。这种阀门广泛应用于电力、机电工程、化工、冶金、石油、天然气等行业的各种气源和管路系统中。

H11X内螺纹单向阀工作原理：当介质顺向流动时，流体压力会克服弹簧阻力推动阀瓣开启，允许介质通过。当介质停止流动或发生逆流时，阀瓣会依靠弹簧作用力以及逆流介质的力量自动关闭，从而有效防止介质倒流。

H11X内螺纹单向阀主要技术参数

为了让您更清晰地了解H11X内螺纹单向阀的性能指标，我整理了以下关键参数表格：

参数类别 具体内容

公称压力 (Nominal Pressure) PN1.0-32.0MPa  或 至 PN40MPa

公称通径 (Nominal Diameter) DN5～DN50  或 DN6～DN100

适用温度 (Applicable Temperature) -20℃ ~ +440℃ ；部分型号可适用于 -196℃ ~ +540℃

阀体材质 (Body Material) 不锈钢 (如 304, 316, 316L, 1Cr18Ni9Ti) ；碳钢 (20#)

连接形式 (Connection Form) 内螺纹 ；部分产品螺纹标准可为 BSPT, NPT 等

适用介质 (Suitable Media) 油、水、气、蒸汽、液化气、弱酸碱介质等多种非腐蚀性或腐蚀性介质

H11X内螺纹单向阀主要特点

根据搜索结果，H11X内螺纹单向阀具有以下突出特点：

· 结构紧凑与高压性能：阀门采用内装摇臂旋启式或升降式结构，所有启闭件均安装在阀体内部，整体结构紧凑。主要承压件经过强度校核，使用安全稳定，适用于高压工况。

· 密封稳定与耐用：阀瓣和阀座的密封面可采用金属对金属的硬密封，或结合氟橡胶等软密封材料，密封稳定，耐磨耐高温，抗擦伤性能好，寿命长。

· H11X内螺纹单向阀安装与维护简便：内螺纹连接方式便于安装和拆卸。

Product Overview: H11X Internal Thread Check Valve

The H11X Internal Thread Check Valve, also known as an Internal Thread Non-Return Valve  Reverse Valve, is an automatic valve that relies on the force generated by the flow of the medium in the pipeline to open  close automatically . Its primary function is to prevent backflow of the medium, protect pumps  drive motors  reversal,  ensure the containment of media within vessels . This type of valve is widely used in pipeline systems across industries such as power, electromechanical engineering, chemical, metallurgy, petroleum,  natural gas .

Operating Principle: When the medium flows forward, the fluid pressure overcomes the spring resistance   pushes the disc open, allowing the medium to pass through. When the medium stops flowing  reverses, the disc closes automatically under the action of the spring force  the pressure of the reverse medium, effectively preventing backflow .

Main Technical Parameters

Parameter Category Specific Content

Nominal Pressure PN1.0-32.0MPa   up to PN40MPa

Nominal Diameter DN5～DN50   DN6～DN100

Applicable Temperature -20℃ ~ +440℃ ; Some models can be applied in -196℃ ~ +540℃

Body Material Stainless Steel (e.g., 304, 316, 316L, 1Cr18Ni9Ti) ; Carbon Steel (20#)

Connection Form Internal Thread ; Thread standards for some products can be BSPT, NPT, etc.

Suitable Media Oil, water, gas, steam, liquefied gas, weak acid-base media,  various other non-corrosive  corrosive media

Key Features

· Compact Structure & High-Pressure Performance: The valve employs a built-in swing arm  lift-type structure, with all opening  closing components housed inside the valve body, resulting in a compact overall design . The main pressure-bearing parts are strength-checked for safe  reliable use in high-pressure conditions .

· Reliable Sealing & Durability: The sealing surfaces of the disc  seat can employ metal-to-metal hard sealing  combine with soft sealing materials like Fluorine Rubber , ensuring reliable sealing, good wear  high-temperature resistance, excellent anti-galling properties,  a long service life.

· Easy Installation & Maintenance: The internal thread connection facilitates installation  disassembly .