H44H国标法兰止回阀的功能是用来防止管路中的介质倒流。止回阀属于自动阀类，启闭件靠流动介质的力量自行开启或关闭。止回阀只用于介质单向流动的管路上，阻止介质回流，以防发生事故。

　　产品名称：旋启式止回阀,升降式止回阀
　　产品型号：H44，H41
　　连接方式：螺纹 卡套 焊接 法兰 
　　压力等级：1.0MPa~ 16.0MPa 
　　产品规格：DN10 ~ 350mm
　　产品材质：WCB碳钢,不锈钢，铬钼钢等等
　　适用温度：≤425 ℃
　　适用介质：水、石油、天然气等

主要连接尺寸：

H44H国标法兰止回阀

· H44H旋启式止回阀是一种自动阀门，用于控制管道中介质的单向流动，防止介质倒流。

· 它采用法兰连接和旋启式结构。阀瓣围绕阀座外的销轴旋转，介质顺流时推动阀瓣开启，逆流时阀瓣靠自重和压差作用关闭。

应用领域 (Application Fields):

· H44H旋启式止回阀广泛应用于石油、化工、制药、电力等行业。

· H44H旋启式止回阀适用介质包括水、油品、蒸汽、酸性介质等。

主要特性 (Key Features):

· H44H旋启式止回阀密封性能好：密封副通常采用铁基或钴基硬质合金堆焊，耐磨、耐高温、耐腐蚀。

· 结构紧凑：采用内装摇臂旋启式结构，所有启闭件装于阀体内部，整体无外漏点，结构紧凑。

· 流阻小：阀瓣关闭冲击力小，不易产生水锤现象，流道通畅，流体阻力小。

· 维护方便：结构简单，动作可信，维修方便。

H44H旋启式止回阀主要技术参数 (Main Technical Parameters):

· 公称通径 (Nominal Diameter): DN15 ~ DN1200

· 公称压力 (Nominal Pressure): 1.6~32MPa/2.0-42.0MPa

· 工作温度 (Operating Temperature): -29℃ ~ +550℃

· 阀体材质 (Body Material): 碳钢、不锈钢（如WCB, WC6, WC9, 304, 316等）

· 密封面材质 (Sealing Surface Material): 不锈钢硬密封（堆焊铁基合金或钴基硬质合金）

· 主要设计标准 (Main Design Standards): GB/T12235

· 连接法兰标准 (Flange Connection Standards): GB/T9113, JB/T79

· 结构长度标准 (Face-to-Face Dimension Standards): GB/T12221

· 试验检验标准 (Test Inspection Standards): GB/T13927, JB/T9092

H44H旋启式止回阀主要性能规范 (Main Performance Specifications)

下面这个表格清晰地展示了不同公称压力下的测试压力要求：

公称压力 (MPa) 壳体试验压力 (MPa) 密封试验压力 (MPa)

Nominal Pressure (MPa) Shell Test Pressure (MPa) Seal Test Pressure (MPa)

1.6 2.4 1.8

2.5 3.8 2.8

4.0 6.0 4.4

6.4 9.6 7.1

10.0 15.0 11.0

H44H旋启式止回阀信息来源：

Product Overview: H44H Flanged Swing Check Valve

The H44H Flanged Swing Check Valve is an automatic valve designed to control the one-way flow of medium in a pipeline prevent media backflow. It features a flanged connection a swing-type structure. The disc rotates around a pin outside the seat; the medium pushes the disc open during forward flow, while the disc closes under the action of its own weight the pressure differential during reverse flow.

Application Fields:

· Widely used in industries such as petroleum, chemical, pharmaceutical, power generation.

· Suitable for media including water, oil, steam, acidic media.

Key Features:

· Excellent Sealing Performance: The sealing pair is often hard-faced with iron-based cobalt-based hard alloys, making it wear-resistant, high-temperature resistant, corrosion-resistant.

· Compact Structure: It adopts an built-in swing arm structure, with all opening closing parts housed inside the valve body, resulting in no external leakage points a compact design.

· Low Flow Resistance: The disc closes with minimal impact force, reducing the risk of water hammer. The flow passage is smooth, resulting in low fluid resistance.

· Easy Maintenance: Simple structure, reliable operation, convenient maintenance.

Main Technical Parameters:

· Nominal Diameter: DN15 ~ DN1200

· Nominal Pressure: 1.6~32MPa/2.0-42.0MPa

· Operating Temperature: -29℃ ~ +550℃

· Body Material: Carbon steel, Stainless steel (e.g., WCB, WC6, WC9, 304, 316, etc.)

· Sealing Surface Material: Stainless steel hard seal (Hard-faced with iron-based cobalt-based hard alloy)

· Main Design Standard: GB/T12235

· Flange Connection Standard: GB/T9113, JB/T79

· Face-to-Face Dimension Standard: GB/T12221

· Test Inspection Standard: GB/T13927, JB/T9092

Main Performance Specifications

The table below clearly shows the test pressure requirements under different nominal pressures:

Nominal Pressure (MPa) Shell Test Pressure (MPa) Seal Test Pressure (MPa)

1.6 2.4 1.8

2.5 3.8 2.8

4.0 6.0 4.4

6.4 9.6 7.1

10.0 15.0 11.0