NonReturn Swing Check Valve： A reliable unidirectional flow control device

NonReturn Swing Check Valve， Also known as a rotary check valve, it is an important component widely used in various industrial and civilian pipeline systems. Its main function is to prevent medium backflow, ensure that the medium in the pipeline can only flow in one direction, thereby protecting equipment, avoiding system failures, and maintaining operational efficiency. This article will explore the low pressure check valve from its structure, working principle, application fields, advantages and disadvantages, in order to gain a deeper understanding of this important valve device.

The design of NonReturn Swing Check Valve is relatively simple, mainly composed of valve body, valve disc, and hinge shaft

The valve disc is connected to the inside of the valve body through a hinge shaft and can rotate around the axis. When the medium flows in the downstream direction, the pressure of the medium overcomes the weight and friction of the valve disc itself, pushes the valve disc open, and the medium passes smoothly. When the medium attempts to flow back, the pressure of the medium presses the valve disc against the valve seat, thereby preventing the medium from flowing back and achieving one-way flow control.

The application fields of NonReturn Swing Check Valve are very extensive

In the water supply and drainage system, a lined check valve can prevent water from flowing back in the pipeline after the pump stops, avoiding impact damage to the pump. In the chemical and petroleum industries, it can prevent the backflow of corrosive or hazardous media in pipelines and protect the safety of downstream equipment. In the power system, it can prevent steam or hot water from flowing back and maintain the normal operation of boilers and pipelines. In addition, it is widely used in industries such as HVAC, food and beverage, and medicine, playing an important role.

The advantages of NonReturn Swing Check Valve are obvious

Firstly, it has a simple structure, high reliability, and low maintenance costs. Secondly, its flow resistance is relatively low, which can reduce energy loss. Thirdly, it has a wide range of applications and can be used in various media and working conditions. However, the lift check valve also has some drawbacks. For example, its opening and closing speed is slow, which can easily cause water hammer phenomenon; Its sealing performance is relatively poor, especially under low pressure conditions; It has a large volume and requires high installation space.

NonReturn Swing Check Valve remains an economically effective and widely applicable choice among numerous unidirectional flow control schemes

In order to overcome its shortcomings, people have been constantly improving and optimizing it. For example, reducing water hammer effect by adding damping devices or reducing the weight of valve discs, improving sealing performance by improving sealing structures, and reducing volume by adopting compact designs.

In summary, the industrial swing check valve is an important pipeline component that plays a critical role in various industries with its reliable one-way flow control function. By gaining a deeper understanding of its structure, working principle, application areas, and advantages and disadvantages, we can better select and use this valve device, thereby improving the safety, efficiency, and reliability of the system. With the continuous development of technology, the design and performance of NonReturn Swing Check Valve will also be continuously improved to meet increasingly complex and demanding application requirements.

NonReturn Swing Check Valve   FAQs

What is NonReturn Swing Check Valve?

NonReturn Swing Check Valve is a valve that automatically opens by fluid pressure and closes by gravity or reverse flow. The valve disc (valve plate) is suspended inside the valve body like a pendulum. When the fluid flows forward, the valve disc is pushed open, and when it flows backward, the valve disc automatically closes to prevent the medium from flowing back.

What is the difference between NonReturn Swing Check Valve and other check valves (such as lift and clamp)?

Swing: The valve disc is disc-shaped and rotates around an axis to open and close, suitable for high flow and low flow conditions.

Lift: The valve disc moves vertically up and down, suitable for small-diameter high-pressure pipelines.

Wafer: Compact structure, small installation space, but not as convenient for maintenance as swing type.

What are the advantages and disadvantages of NonReturn Swing Check Valve?

advantage:

Low flow resistance, suitable for large pipe diameters (above DN50).

Good sealing performance, with minimal impact when closed (buffering device can be added).

Disadvantages:

When installing horizontally, attention should be paid to the direction of gravity of the valve disc (usually requiring the axis of the valve disc to be perpendicular to the horizontal plane).

Not suitable for media with frequent opening and closing or containing solid particles.

What are the requirements for the installation direction of NonReturn Swing Check Valve?

Horizontal pipeline: The valve disc shaft must be in a horizontal position to ensure that the valve disc can swing freely.

Vertical pipeline: The fluid direction must be from bottom to top, otherwise the valve disc cannot be closed by gravity.

Before installation, check the flow arrow (→) on the valve to avoid reverse installation.

How to choose the material and pressure rating of NonReturn Swing Check Valve?

texture of material:

Valve body: cast iron (CI), ductile iron (DI), carbon steel (WCB), stainless steel (SS304/316).

Valve disc/seal: rubber (NBR/EPDM), stainless steel+rubber coating.

Pressure level:

Low pressure: PN10/PN16 (water treatment, air conditioning system).

Medium high pressure: PN25~PN40 (petroleum and chemical pipelines).

Standard: API 594 (Petroleum Industry) ANSI B16.34、GB/T 13932。