说明：

       H76双阀瓣止回阀由阀体、阀瓣、阀杆及弹簧等零件组成，采用对夹连接。由于阀瓣的关闭行程短，并且有弹簧加载，或明显减少水锤现象。该阀主要适用于城市、工业及高层建筑给水、排水管网上。由于其结构长度比一般止回阀短，对有安装空间限制的场所较为适用，适用于公称压力PN1.0MPa～42.0MPa 、Class150～2500；公称通径DN12～1200mm、NPS1/2～48；工作温度-196～540℃的各种管路上，用于防止介质倒流。通过选用不同的材质，可适用于水、蒸汽、油品、硝酸、醋酸、强氧化性介质及尿素等多种介质。

主要连接尺寸：

H76双阀瓣止回阀

H76型双阀瓣止回阀是一种对夹式、旋启式的自动阀门。其主要作用是防止管道中的介质倒流，避免泵和驱动电机反转，以及容器内介质的泄放。它广泛应用于化工、石油、制药、食品、给排水、电力及市政建设等行业。

H76型双阀瓣止回阀工作原理

当介质顺向流动时，流体压力会冲开阀瓣，使阀门开启，介质通过。当介质停止流动或发生逆流时，阀瓣会依靠弹簧的作用力、自身重量以及逆流介质的力量迅速关闭，从而形成密封，防止介质倒流。

H76型双阀瓣止回阀主要特点

· 结构紧凑：结构长度通常只有传统法兰止回阀的1/4至1/8，体积小，重量轻。

· 关闭迅速，水锤压力小：阀瓣关闭行程短，并有弹簧辅助加载，能快速关闭，明显减少水锤现象。

· 安装灵活：既可水平安装，也可垂直安装于管路上。

· 流阻小，密封性好：流道通畅，流体阻力小，动作灵敏，密封性能稳定。

H76型双阀瓣止回阀主要技术参数

下表汇总了该阀门的主要技术参数：

参数类别 具体内容

公称通径 (Nominal Diameter) DN15/DN50 ~ DN1200

公称压力 (Nominal Pressure) PN1.0~42.0MPa

工作温度 (Operating Temperature) -196℃ ~ +540℃

阀体材料 (Body Material) 铸铁 (Cast Iron)、碳钢 (Carbon Steel/WCB)、不锈钢 (Stainless Steel/CF8, CF8M, etc.)

阀瓣/阀杆材料 (Disc/Stem Material) 碳钢 (Carbon Steel)、不锈钢 (Stainless Steel)

密封材料 (Sealing Material) 丁腈橡胶 (NBR)、不锈钢 (Stainless Steel)

适用介质 (Suitable Media) 水 (Water)、蒸汽 (Steam)、油品 (Oil)、燃气 (Gas)、酸类 (Acids) 等

Product Overview: H76 Double Disc Check Valve

Product Definition & Application

The H76 type double disc check valve is awafer-type, swing-type automatic valve . Its primary function is to prevent the backflow of medium in pipeline systems, avoid pump drive motor reversal, release media containers . It is widely used in industries such as chemical, petroleum, pharmaceutical, food, water supply drainage, power generation, municipal construction .

Operating Principle

When the medium flowsforward, the fluid pressure pushes the discs open, allowing the medium to pass through . When the medium stops flowing reverses, the discs quickly close under the action of the spring force, their own weight, the reverse medium, forming a seal preventing backflow .

Key Features

· Compact Structure: Its face-to-face dimension is typically only 1/4 to 1/8 of traditional flanged check valves, resulting in a small volume light weight .

· Quick Closing & Minimal Water Hammer: The short travel of the discs, assisted by spring loading, enables rapid closure, significantly reducing water hammer phenomena .

· Flexible Installation: It can be installed on both horizontal vertical pipelines .

· Low Flow Resistance & Good Sealing: The unobstructed flow path ensures low fluid resistance. It operates sensitively provides reliable sealing performance .

Main Technical Parameters

Parameter Category Specific Content

Nominal Diameter DN15/DN50 ~ DN1200

Nominal Pressure PN1.0~42.0MPa

Operating Temperature -196℃ ~ +540℃

Body Material Cast Iron, Carbon Steel (WCB), Stainless Steel (CF8, CF8M, etc.)

Disc/Stem Material Carbon Steel, Stainless Steel

Sealing Material Nitrile Rubber (NBR), Stainless Steel

Suitable Media Water, Steam, Oil, Gas, Acids, etc.