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工作原理:止回阀

发表:01/09/2015

颜色突出显示的阀门

止回阀,也称为止回阀或单向阀,使流体在管道中单向流动. 阀瓣悬挂在阀盖底部的铰链、阀瓣轴或销上. This design inhibits backflow in a line.

因为它们的设计简单, 止回阀的操作通常不需要自动化或人工干预,而是依靠流体的流速来开启和关闭. 这意味着它们没有像把手或杠杆这样的外部操作方法. 操作阀门所需的最小上游压力称为裂解压力, 一般在1到5psi之间. 止回阀s are designed specifically with this number in mind.

The degree of opening on a check valve is determined by the flow rate. 流速越高, the more open the valve will be until it reaches its maximum, 充分的位置. On many check valves, the full open position is approximately 85°.

新门, 全球, and check valves
Ideal for standard and critical power industry applications, 新门, 全球, 止回阀包括一个压力密封阀盖连接,消除了阀体和阀盖法兰, reducing weight and simplifying the application of exterior insulation.

类型

摇摆(tilting-disc) 止回阀由带有阀瓣的阀瓣组成,阀瓣在上游进口侧是凸的,在下游出口侧是平的. 适用于API规格600阀门, 这种阀瓣在安装在阀盖底部的铰链上摆动. 适用于API规格6D阀门, 典型的结构是阀体内的铸造袋,带有插入式轴或销和衬套装置,阀瓣将开启. 这种结构需要某种约束来保持拍子在口袋里. 新的设计特点是改进了模块化,便于更容易的组装, enabling different configurations to be assembled with a base design.

喷嘴(轴流) check valves have a spring-loaded disc that translates horizontally. 弹簧采用非冲击设计,消除了水锤的影响. 这些阀门被设计成处于全开位置,即使在最小流量下,也能确保性能. 喷嘴式止回阀既可以安装在地下,也可以安装在地面上,是气体应用的理想选择.

止回阀包括一个球形阀瓣,有时在压力低于破裂压力时,该阀瓣被弹簧加载以密封. 因为球形设计, these valves can easily wear from prolonged use and require frequent maintenance; therefore, 它们应该安装在维修小组容易进入的地方.

隔膜 止回阀由一个橡胶膜片阀瓣组成,当上游压力大于下游压力时,阀瓣弯曲打开,当压力相等或低于设定的压差时,阀瓣关闭.

停止 止回阀的结构通常类似于旋启式止回阀,但有一个额外的外部控制机构,例如 致动器,杠杆,或手轮,使阀门能够故意关闭,而不管流量压力.

鸭嘴兽 阀门使流体通过软管道进入阀门的下游,在软管道中,反压力使管道塌陷并切断流体.

特性

The main advantage of a check valve is its simple design. 一般, 与其他类型的阀门相比,止回阀也更小,更容易安装, making maintenance easier and more efficient. 止回阀可以设计成具有特定的非冲击特性,以减少噪音和密封磨损. 在LNG泵站和气体压缩机站中,通常选择ENTECH喷嘴止回阀. 另外, 因为他们很简单, 流线型的设计, 与同类活塞式止回阀相比,TOM WHEATLEY止回阀和ENTECH止回阀具有更低的压降(小于1 psi).

应用程序

因为它们的设计简单 and versatile material options, check valves are used in a variety of markets and applications. 止回阀s can be designed to API Specs 600 or 6D standards. 通常,设计符合API Spec 600规格的止回阀用于工业市场. Usually designed with reduced port sizes, these valves have special bolting and cover sealing, 角的座位, 一个两件式拍子和臂单元, 硬铬装饰. 止回阀可以根据不同的壁厚要求设计,并具有ASME B16规定的额定压力和温度.34. API规格600和6D止回阀, which are designed for use in the oil and gas industry, 是否有可拆卸阀座以及阀盖到阀体的密封连接, 阀盖垫片, 盖螺栓.

特殊的水下高压低温作业阀门可以设计成一个系统. The TOM WHEATLEY valve features a unique, free-swinging clapper. If reverse flow or a critical pigging operation is required, the clapper can be actuated manually, 液压, or via ROV and held in the 充分的位置. This feature is also available in nonsubsea applications as well.

NEWCO valves are available in sizes from 1/4 to 24 in [5 to 600 mm], ASME 150至1500级, and in various grades of stainless steel.
NEWCO valves are available in sizes from 1/4 to 24 in [5 to 600 mm], ASME 150至1500级, and in various grades of stainless steel.

NEWCO闸阀,截止阀和止回阀是标准和关键电力工业应用的理想选择. The pressure-seal bonnet joint eliminates the body and bonnet flanges, reducing weight and simplifying the application of exterior insulation. 与螺栓阀盖阀门相反, 施加在压力密封阀上的内部压力迫使密封元件紧密接触——内部压力越高, 密封越严密. 倾斜阀瓣止回阀的设计在低速环境中产生最小的限制,是防止水平流单向流应用中回流的理想选择. 另外, the tilting-disc design offers closing that reduces slamming.

ENTECH DRV-Z
喷嘴止回阀