产品用途：

       H44H美标法兰止回阀适用于ANSI Class 150～600Lb，工作温度≤600℃的石油、化工、火力电站等各种工况的管路上。适用介质为：水、油品、蒸汽等。

结构说明：

       1.设计制造按API标准，密封稳定，性能优良、能与进口设备配套使用。
       2.阀座密封面采用铁基合金或司太立（stellite）钴基硬质合金堆焊而成，耐磨、耐高温，耐腐蚀，抗擦伤性能好、使用寿命长。
       3.两端为法兰连接完全按API标准设计制造，能满足进口设备配套和出口标准的要求.

       公称压力：150LB～600LB
       通径范围：2～24
       工作温度：-29～550℃的石油、化工、火力电站等各种工况的管路上
       主要材质：WCB 304 316 316L
       适用介质：水、油品、蒸汽等

主要连接与外形尺寸及重量：

美标法兰止回阀

美标法兰止回阀是指按照美国国家标准协会（ANSI） 或 美国石油协会（API） 等标准设计和制造的法兰连接式逆止阀。其核心功能是自动阻止流体反向流动，仅允许介质沿单一方向通过，是保障石油、化工、电力等行业管道系统安全的关键装置。

美标法兰止回阀通过 ANSI 标准法兰与管道系统连接，法兰的压力等级、密封面形式、尺寸等均严格遵循美标规范（如 ANSI B16.5, B16.34），确保了与同样遵循美标管道元件的互换性和兼容性。阀体多采用铸钢、不锈钢或合金钢制造，内部结构常见旋启式 或 升降式，以适用于不同的流量、压力及安装要求。

美标法兰止回阀主要特点：

标准合规性： 严格遵循ASME/ANSI, API, MSS等美国标准，确保全球范围的通用性和互换性。

压力等级完整： 覆盖Class 150, 300, 600, 900, 1500, 2500等多个压力等级，满足从低压到超高压的各种工况。

连接稳定： 法兰连接方式成熟，螺栓预紧力均匀，密封性能好，便于安装和拆卸检修。

美标法兰止回阀结构多样： 可根据介质特性（如含有固体颗粒、清洁度）选择旋启式、升降式、斜盘式等不同结构。

美标法兰止回阀材料广泛： 主体材料可选WCB, WC6, WC9, C5, CF8, CF8M等，以应对腐蚀、高温、高压等苛刻条件。

美标法兰止回阀典型应用：

石油与天然气：从井口、输送管线到炼化厂的各类工艺管道。

化工与石化：各种腐蚀性介质的流程设备进出口。

电力工业：电站的给水系统、高压蒸汽系统。

造船与海洋工程：船舶动力系统及海上平台管路。

供水系统：大型泵站的出口，防止水锤。

Product Overview of American Standard Flanged Check Valves

Product Overview:

An American Standard flanged check valve refers to a flanged non-return valve designed manufactured in accordance with standards set by the American National Standards Institute (ANSI) the American Petroleum Institute (API). Its core function is to automatically prevent reverse flow allow media to pass in one direction only, making it a critical device for ensuring the safety of piping systems in industries such as oil, chemical, power.

The valve connects to the piping system via ANSI standard flanges. The pressure class, face type, dimensions, other features of the flanges strictly comply with American standards (e.g., ANSI B16.5, B16.34), ensuring interchangeability compatibility with other piping components that also adhere to these standards. The valve body is typically made of cast steel, stainless steel, alloy steel. Common internal designs include swing type lift type, suitable for different flow, pressure, installation requirements.

Key Features:

Standards Compliance: Strictly conforms to ASME/ANSI, API, MSS, other U.S. standards, ensuring global通用性和互换性。

Complete Pressure Range: Covers multiple pressure classes including Class 150, 300, 600, 900, 1500, 2500, meeting various operating conditions low to ultra-high pressure.

Reliable Connection: The flanged connection is a proven reliable method. Bolt pre-tension is even, providing excellent sealing performance. It facilitates easy installation, disassembly, maintenance.

Diverse Structures: Different internal designs such as swing, lift, tilting-disc can be selected based on media characteristics (e.g., containing solids, cleanliness).

Wide Material Selection: Body materials can be WCB, WC6, WC9, C5, CF8, CF8M, etc., to handle苛刻条件 like corrosion, high temperature, high pressure.

Typical Applications:

Oil & Gas: Various process pipelines wellheads, transmission lines to refineries.

Chemical & Petrochemical: Inlet/outlet lines of process equipment handling corrosive media.

Power Industry: Feedwater systems high-pressure steam systems in power plants.

Shipbuilding & Offshore Engineering: Ship power systems offshore platform piping.

Water Supply Systems: Outlet of large pumping stations to prevent water hammer.

关键术语翻译 (Key Terminology Translation):

美标法兰止回阀: American Standard Flanged Check Valve / ANSI Flanged Check Valve

美国国家标准协会 (ANSI): American National Standards Institute (ANSI)

美国石油协会 (API): American Petroleum Institute (API)

压力等级: Pressure Class (e.g., Class 300)

法兰密封面: Flange Face Type (e.g., RF-Raised Face, RTJ-Ring Type Joint)

旋启式: Swing Type

升降式: Lift Type / Piston Type

铸钢: Cast Steel

材料牌号: WCB (C碳钢), CF8 (304 SS), CF8M (316 SS)