Tilting Check Valves: An Essential Component for Backflow Prevention

In applications such as water treatment, industrial facilities, municipal networks, and power plants, check valves play a vital role in preventing reverse flow. Among various types, the Tilting Check Valve stands out with its superior hydraulic performance and reliable slow-closing mechanism, making it a trusted solution for large pumping stations and long-distance transmission lines.

How It Works

1.Forward Flow – Valve Opens
When fluid (such as water, oil, or gas) flows into the valve, the pressure causes the disc to rotate around a tilted shaft, lifting it and allowing the medium to pass through with minimal resistance. The optimized disc angle helps reduce energy loss and ensures smooth operation.

2. Reverse Flow – Valve Closes
When the pressure drops or flow reverses, the disc automatically returns to the closed position, assisted by gravity or reverse pressure. A built-in slow-closing device, such as a hydraulic damper or counterweight, helps delay the closing action, effectively reducing the risk of water hammer and protecting the pipeline system.

Video source: Sierra

What Makes Tilting Check Valves Unique

• Compact butterfly-style body for shorter installation length and lighter weight
• Tilting, double-offset disc allows stable, efficient movement during opening and closing
• Multiple sealing options, including wear-resistant rubber and full-metal seals
• Independent slow-closing mechanism (hydraulic or weighted), designed to operate smoothly and reliably without contact with the fluid
• Adjustable sealing force: A counterweight arm with calibration holes allows fine-tuning of the disc pressure against the seat, ensuring tight sealing even under low backpressure conditions

The Difference Between a Tilting Check Valve and a Regular Check Valve

Union valve Tilting Check Valve specification

Proper installation is essential to ensure the reliable performance and longevity of a tilting check valve. Below are the recommended practices and checks for safe and effective installation.

1.Storage Requirements

For soft-sealing valves, keep the sealing surfaces (disc and seat) covered to prevent contamination from dust or debris, which may affect sealing performance.

The valve and any attached slow-closing device (e.g. hydraulic cylinder or counterweight) should be stored in a horizontal position for safety and stability.

2. Pre-Installation Inspection

Before installation, perform the following checks:

• Ensure the valve has not been damaged during transport or storage.
• Verify that the sealing surfaces and valve cavity are clean and free of debris.
• Check that external control piping, if applicable, is intact.
• Confirm that the disc moves freely without obstruction.
• Test that the slow-closing mechanism and limit arm function smoothly and are not jammed.

3. Installation Instructions

A. Orientation and Placement

1. Flow Direction: Always install the valve according to the flow direction arrow marked on the valve body. Installing it in reverse may cause the valve to malfunction.
2. Recommended Position: Install on horizontal or slightly inclined piping, ensuring the disc can open and close freely.
3. Vertical Installation: Only permitted if the valve is specifically designed for it, and the media must flow upwards.
4. Suggested Location: Place the valve near the pump outlet to minimize backflow distance and allow quicker closing action.

B. Installation Steps

1. Install a suitable gasket between flanges to ensure a tight seal.
2. Tighten the flange bolts in a crisscross pattern to ensure even pressure and prevent valve body deformation.
3. If the valve includes a hydraulic damper or counterweight, make sure it has adequate space to operate without obstruction.
4. For models with a bypass line, ensure all connections are correct and secure.

4. Post-Installation Commissioning

• Test disc movement by manually pushing the counterweight or allowing fluid to flow through and observing valve action.
• For hydraulic models, adjust the throttle valve on the damper to control the closing speed.
• Before initiating full flow, gradually open the upstream valve and observe whether the check valve opens and closes correctly.

Common Issues and Troubleshooting for Tilting Check Valves

Final Note

In fluid control systems, performance, reliability, and durability are non-negotiable—and the tilting check valve stands out as an advanced yet practical solution. With an optimized flow path, automatic slow-closing design, and strong adaptability to demanding water conditions, it has become a preferred choice among engineers and system designers.

At Union Valve, we don’t just manufacture valves—we deliver complete solutions. Backed by decades of experience, internationally recognized certifications, and a commitment to quality, our products are trusted in over 100 countries. Whether you need a standard model or a fully customized configuration, our team is here to support your project from design to commissioning.

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