Swing Check Valve DIN3202 F6 DN50-DN400

What is a Swing Check Valve?

A swing check valve, sometimes referred to as a non-return valve or one-way valve, is an automatic valve mechanism designed to allow fluid to flow in only one direction and prevent backflow. It achieves this function through a hinged disc or flap that swings open with forward flow and closes automatically when the flow stops or reverses.

In Yaxing Valve’s cast iron swing check valve, the valve body contains two flanged ports—an inlet and an outlet. When fluid enters through the inlet, it pushes the internal disc away from the seat, allowing unimpeded passage. If flow attempts to reverse, the pressure on the outlet side forces the disc back onto the seat, sealing off the passage and stopping backflow instantly.

Advantages of Yaxing Swing Check Valve

Explore the key advantages of our Yaxing swing check valves and why they're the preferred choice for engineers and system designers worldwide.

1. Easy Maintenance – Swing Check Valve with Top Entry Design

One of the standout features of a swing check valve for industrial piping systems is the ease of maintenance. The bonnet design of the swing check valve allows operators to remove the hinge pin, disc, and cover by loosening a few bolts—without removing the valve body from the line.

The tilted valve seat (20°) improves sealing performance, even at low backflow pressures. The swing disc is built for durability and resists misalignment over time. Perfect for installations requiring a horizontal swing check valve or vertical swing check valve with top-entry servicing. Top-entry swing check valve maintenance can reduce system downtime by 30% or more compared to conventional valve designs.

2. Water Hammer Protection – Anti-Surge Swing Check Valve

Water hammer, or hydraulic shock, is a major concern in fluid systems. Our anti-water hammer swing check valves include optional lever and weight assemblies or damping systems to control closing speed and absorb surge pressure.

Reduces fluid surge pressure that can damage pumps, joints, or meters. Suitable for high-pressure pipelines using ductile iron swing check valves. Optional safety cover and remote monitoring switch available for safe operation. Hydraulic analysis shows our swing check valve with weight and lever can reduce pressure spikes by up to 55%, ensuring system integrity.

3. High Flow Efficiency – Full Port Swing Check Valve Design

Yaxing’s full bore swing check valves are engineered to offer maximum flow with minimum pressure loss. The gravity-actuated swing disc opens fully during forward flow, allowing unobstructed passage of fluids.

High Cv value swing check valve ideal for water, oil, or gas systems. Maintains high throughput in low-pressure swing check valve applications. Available in DN50 to DN600 swing check valve sizes to suit diverse system demands. CFD simulations confirm a 15–20% higher flow rate versus conventional check valves in the same class.

4. Cost-Effective Backflow Prevention – Economical Swing Check Valve

Yaxing offers a competitive advantage through our low-cost swing check valves that deliver premium quality without inflating your budget. Whether you need a cast iron swing check valve for potable water or a flanged swing check valve for HVAC loops, we’ve got the right fit.

Economical choice for backflow prevention valve systems. Compatible with ANSI, DIN, and BS swing check valve standards. Used in municipal, commercial, and process industry sectors.

Installation Procedure for Yaxing Swing Check Valve 

Proper installation of a swing check valve is crucial to ensure optimal performance, backflow prevention, and long-term reliability in your pipeline system. Before installing a Yaxing swing check valve, it is essential to carry out a thorough inspection of the valve to confirm its integrity and functionality.

Detailed Swing Check Valve Installation Steps

1. Confirm Flow Direction

All Yaxing swing check valves feature a clearly marked flow direction arrow on the body. During installation, ensure that the media flow direction matches the arrow indicator. Incorrect installation may cause the valve to malfunction, leading to improper check valve operation or backflow issues.

2. Choose an Appropriate Installation Location

Select a location that: Allows for easy access to the swing check valve for maintenance or inspection. Is structurally supported to prevent the valve body from bearing excessive pipe stress. Is suitable for either horizontal or vertical swing check valve installation.

3. Install the Valve

Place the swing check valve into the pre-determined pipe section. Use appropriate gaskets and fasteners to secure the valve to the pipeline flanges. Tighten the bolts uniformly to avoid flange misalignment.

4. Check Installation Quality

After the valve is installed: Confirm the swing disc moves freely without obstruction. Ensure all bolts are tightly and evenly fastened.

Perform a pressure test in accordance with relevant standards to verify the sealing performance and structural integrity of the swing check valve. Open and close the valve manually (if possible) to ensure smooth swing operation.

Part & Materials

No	Part	Material
1	Body	Ductile Iron GGG50
2	Seat	Brass
3	Disc	GGG50+Brass /EPDM
4	Shafe	SS420
5	Rocker	Ductile Iron GGG50
6	Bonnet	Ductile Iron GGG50
7	Seal Gasket	Metallic Gasket / Rubber
8	Bolts	A2-70

Dimensions(mm)

Technical Data