Check Valve
Your Professional Check Valve Supplier
Quanzhou Keliang Valve Co., Ltd. was established in 2000. After more than twenty years of development, the company has achieved a significant leap from small-scale production to modern automated manufacturing. Today, Keliang operates a large production base equipped with advanced production lines and testing systems. We are capable of manufacturing a wide range of high-quality valve products, including gate valves, foot valves, check valves, butterfly valves, and filters/strainers. The company is a supplier to numerous foreign trade companies and well-known valve brands.
Why Choose Us
Certifications
As an ISO 9001–certified original equipment manufacturer (OEM), we provide OEM and private label manufacturing services for many well-known large valve manufacturers both domestically and internationally.
Sales Market
The company has gradually expanded into the production of fire hydrants and has successfully entered the international market. Our products are exported to Southeast Asia, South America, the Middle East, Africa, and other countries and regions, earning the trust and recognition of customers worldwide.
Customization Available
Stainless steel valve stems, bolts, and nuts are available as optional components, depending on your target price and brand positioning.
A silent check valve is a valve used to prevent reverse fluid flow. Also, this valve helps to prevent water hammer problems and its related effects. A water hammer is a shock wave of high pressure that occurs when fluid flow is stopped abruptly due to either the valve disc closing or the pump shutting down. Water hammer is dangerous because it causes high stress on the piping system which could cause structural damage to the piping system. As such, silent check valve manufacturers design these valves to help in eliminating water hammer problems. When the pump is shut off or when fluid pressure reduces, the valve has a spring action that helps to control disc closure before fluid reverses. This design helps to ensure that the valve does not slam shut and thus eliminates the water hammer and reverse fluid flow.
Product Parameter
| Product Name | Flanged Silent Check Valve |
| Main Material | Ductile Iron |
| Surface Finishing | Epoxy Red or Blue |
| Working Pressure | PN10/PN16/PN25 |
| Size | DN50(2") to DN300(12") |
| Connection | Flange end |
| Media | Water |
| Temperature Range | 0℃-80℃ |
| Leakage Class | Class A |
Product Material
|
Part |
Material |
|
Body |
Ductile Iron QT450-10 |
|
Stem |
304 Stainless Steel |
|
Disc |
Ductile Iron |
|
Spring |
304 Stainless Steel |
|
Bolt |
304 Stainless Steel |
|
Seal |
NBR |
|
Bushing |
Bronze |
1. The water flow channel in the valve body is straight and tends to streamline, which can improve the flow of the medium.
2. Valve opening and closing movement distance is short, and can be quickly opened and closed, the water hammer sound is slight, and the silent effect is excellent.
3. The valve body is cleverly designed, has a reasonable structure, is lightweight, easy installation, and has good sealing performance.
4. The combination of light butterfly plate, short stroke, and fast closing spring design effectively reduces water hammer.
5. Streamline design reduces head loss.
6. Special seat design ensures quick and easy replacement of internal parts.
7. Inner and outer surfaces are coated with fusion bonded epoxy resin.
8. Metal valve seat is durable and high temperature resistant.
- Can be installed in either vertical or horizontal orientation since they do not depend on gravity to open or close.
- Automatic.
- These valves are free from fluid leakage.
- Free from water hammer, vibrations, and surge problems.
- They can maintain working pressure.
- Low-pressure drop, unlike other valves.
- Versatile as they can be used in different industries.
- Durable since they can be repaired when they break down.
- Easy to install, assemble and repair.
Ultra-Silent Performance
Equipped with a rubber flap + spring buffer structure, it eliminates the "slamming" noise of traditional valves; operational noise ≤40dB, blending with ambient background sound (ideal for quiet spaces like basements).
Reliable Anti-Backflow Seal
The flexible rubber flap fits tightly with the valve seat, achieving bubble-tight closure (zero leakage) to prevent wastewater from flowing back into the sump pit, avoiding re-flooding.
Durable & Adaptive BuildMaterials: Ductile iron (epoxy coating, 1000-hour salt spray resistance) or PVC (lightweight, corrosion-proof);
Impurity Tolerance: Withstands particles ≤3mm in wastewater, no risk of jamming.
Easy Installation
Supports 1.5"–3" flanged/threaded connections, compatible with most standard sump pumps; no specialized tools required for on-site assembly.
Working Principle of Silent Check Valve
Forward Flow
When the medium (such as water, air, or oil) flows in the correct direction, the valve disc automatically opens under fluid pressure, allowing free passage.
01
Reverse Flow Prevention
When flow stops or reverses, the disc closes rapidly with help from.
02
Spring Assistance
The built-in spring applies back pressure to the disc, speeding up closure.
03
Optional Damping Design
Some models use a two-stage closing action (fast-close followed by soft-close) to eliminate impact from sudden shut-off.
04
Noise Reduction
The valve design incorporates optimized disc geometry, spring tension, and sealing materials to minimize vibration and sound during closure.
05
Packaging And Services
Standard Packaging
Durable PVC bags + compact packaging boxes + sturdy export cartons;
Customized Services
Tailored packaging design to meet specific branding and design needs.
FAQ