forede® proudly introduces the H44T Flange End Swing Check Valve, a high-performance solution designed for efficient backflow prevention and optimal fluid flow management in various piping systems.
It boasts notable features: flange ends meet ANSI150LB, GB Standard, and BS Standard, ensuring seamless integration into diverse infrastructures. Screws and latches are crafted from SS304 Stainless Steel, providing superior corrosion resistance and structural reliability. The body is made of Ductile Iron QT450 for exceptional durability, while the disc-constructed from Ductile Iron QT450 covered by NBR-enables tight sealing and smooth swing action to prevent reverse flow. The surface finishing is Epoxy Red or Blue, offering long-lasting corrosion protection and easy visual distinction.
Available in sizes from 2 Inch (50 mm) to 12 Inch (300 mm), all models feature flange end connections, a swing valve type, and operate at a working pressure of 1.0/1.6 Mpa, with color options of Red or Blue for flexible installation needs.
Engineered and manufactured by forede® with rigorous quality assurance, the H44T Flange End Swing Check Valve is a trusted choice for applications like municipal water supply, industrial process pipelines, and HVAC systems, where preventing backflow and ensuring system integrity are paramount.
| Body Material |
Ductile Iron, QT450 |
| Screw Material |
SS304 Stainless Steel |
| Latch Material |
SS304 Stainless Steel |
| Dis Material |
Ductile Iron , QT450, Coverd By NBR |
| Flange End |
ANSI 150 LB / GB / BS Standard |
| Valve Type |
Swing |
| Working Pressure |
1.6 Mpa |
| Surface Finishing |
Epoxy Red or Blue |
1. Impact of Particulate - Laden Fluids on Valve Performance
Q: How does the H44T valve handle fluids with solid particles (e.g., slurry), and what precautions are necessary?A: The NBR - coated disc and ductile iron body can tolerate minor particles, but excessive debris may jam the disc or wear the coating. Install a high - capacity strainer (mesh size ≤0.5mm) upstream. For heavy - particulate media, switch to a valve with a stainless steel disc and body, and increase inspection frequency to monthly.
2. Installation on Inclined Pipelines
Q: What is the maximum allowable pipeline slope when installing the H44T valve, and how does it affect performance?A: For horizontal installation, the pipeline slope should not exceed 5° from the horizontal. Excessive slope can cause the disc to misalign, leading to leakage or poor sealing. If the pipeline is inclined, ensure the flow direction is such that the disc swings freely without being obstructed by gravity.
3. Freeze Protection in Cold Regions
Q: How to prevent the H44T valve from freezing and cracking in sub - zero environments (e.g., northern China)?A: Drain the system completely when not in use. For systems that can't be drained, use electric heat tracing around the valve and pipes, maintaining a temperature above 5°C. Apply insulation sleeves (fire - rated foam) to the valve body, and use antifreeze fluid if the system design permits.
4. Comparison with Double - Disc Swing Check Valves
Q: What are the key differences between the H44T single - disc swing check valve and double - disc swing check valves?
| Feature |
H44T Single - Disc |
Double - Disc Swing Check Valve |
| Flow Resistance |
Lower (single disc has a streamlined path) |
Slightly higher (two discs create more turbulence) |
| Sealing |
Reliable with NBR coating |
Good, but may have more leakage points |
| Installation |
Suits larger pipe sizes (up to 12") |
Often used in smaller pipes (≤6") |
| Cost |
More economical for large - diameter applications |
Cost - effective for small - scale systems |
5. Bolt Tightening Torque Specifications
Q: What torque should be used when tightening the SS304 flange bolts, and how to ensure uniform tension?A: Refer to the flange standard (ANSI150LB/GB/BS) for torque values-typically 50-150 N·m depending on size. Use a torque wrench and tighten bolts in a crisscross sequence (e.g., 1-3-2-4 for four - bolt flanges) to ensure even pressure on the gasket.
6. Suitability for Vacuum Systems
Q: Can the H44T valve be used in vacuum (negative pressure) systems, and what modifications are needed?A: The valve is designed for positive pressure. In vacuum systems, the disc may not seal properly or could be pulled open by negative pressure. Use a vacuum - rated check valve (e.g., with a spring - loaded disc) instead, or modify the H44T by adding a vacuum relief mechanism (consult the manufacturer for feasibility).
7. Effect of Maintenance Frequency on Lifespan
Q: How does regular maintenance (e.g., cleaning, inspection) impact the H44T valve's service life?A: With quarterly inspections (cleaning the disc, checking NBR coating, tightening bolts), the valve can last 8-12 years. Neglecting maintenance reduces lifespan to 3-5 years, as debris buildup causes wear, and loose bolts lead to leakage and mechanical stress.
8. Response in Emergency Shutdown Systems
Q: Can the H44T valve be integrated into emergency shutdown (ESD) systems, and how quickly does it close?A: The H44T is a passive check valve (relies on flow direction), so it can't be actively controlled in ESD systems. For ESD applications, use an actuated check valve (e.g., pneumatic or electric) that can close on command. The H44T's closure speed depends on flow reversal, typically 0.5-2 seconds.
9. Protection Against Pump Water Hammer
Q: How effectively does the H44T valve protect pumps from water hammer, and can it be enhanced?A: The swing disc helps mitigate water hammer by closing gradually, but severe pressure spikes may still occur. Enhance protection by installing a water hammer arrester upstream and ensuring the valve is sized correctly (no undersizing, which increases velocity). Use variable - speed pumps to reduce abrupt flow changes.
10. Factory and Field Testing Requirements
Q: What tests does the H44T valve undergo before delivery, and what field tests are recommended after installation?A: Factory tests include pressure testing (1.5× working pressure for 30 minutes), leakage testing (zero leakage at working pressure), and functional testing (disc movement). Field tests should replicate these, plus flow testing (verify disc opens/closes with flow) and alignment checks (ensure flanges are concentric).
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