China Check Valve Manufacturers, Suppliers and Factory - Customized 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.

3 Inch Flanged Check Valve
3 Inch Flanged Check Valve delivers automatic pipeline protection through its weighted disc mechanism. Forward flow smoothly lifts the disc; flow cessation triggers immediate closure via gravity and backpressure. Specially formulated
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Rubber Flap Check Valve
Rubber flap check valve features a heavy-duty ductile iron body and a flexible rubber flap for dependable one-way flow control. It opens smoothly under forward pressure and seals tightly to stop backflow, offering low resistance, quiet
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Flanged Silent Check Valve
Flanged Silent Check Valve provide superior strength and durability for high-pressure systems where water hammer and reverse flow are major concerns. The ductile iron construction offers exceptional impact resistance and longevity, far
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Quiet Silent Check Valve
Quiet Silent Check Valve engineered from ductile iron are designed for reliability in the most rigorous conditions. The use of ductile iron ensures high tensile strength and excellent corrosion resistance, making it perfect for commercial
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Silent Type Check Valve
Silent Type check valve built with ductile iron addresses critical backflow and noise challenges in heavy-duty applications. It combines a robust spring mechanism with high-quality materials to achieve silent closure and seamless
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Cast Iron Silent Check Valve
Cast Iron Silent Check Valve made from ductile iron deliver critical protection for piping systems. This silent check valve variant utilizes a spring-assisted disc to form a tight seal before flow reversal can occur, ensuring unimpeded
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2 Inch Silent Check Valve
2 Inch Silent Check Valve constructed from ductile iron offer a perfect blend of robust construction and precise performance. The durable material resists cracking and deformation under high pressure, while the internal spring mechanism
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Ductile Iron Silent Check Valve
Ductile Iron Silent Check Valve crafted from ductile iron delivers exceptional performance in minimizing water hammer and backflow. Its advanced spring-loaded design guarantees smooth, instantaneous closure, maintaining system integrity
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Swing Check Valve Flange Type
Swing Check Valve Flange Type autonomously regulates unidirectional fluid movement. Its pivoting disc design harnesses forward flow energy for effortless opening while sealing instantly against backflow. Crafted from corrosion-resistant
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4 Inch Flanged Check Valve
4 Inch Flanged Check Valve delivers essential backflow defense without complex controls. The free-swinging disc responds dynamically to flow changes – lifting during forward movement and sealing tightly against reverse pressure.
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PN16 Swing Check Valve
Ductile Iron PN16 Swing Check Valve minimizes energy loss with its full-port configuration and hydrodynamically shaped disc. Engineered for water, air, and neutral media applications, it maintains unrestricted flow during operation while
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100mm Swing Check Valve
100MM Swing Check Valve utilizes fluid dynamics for fail-safe directional control. Its precision-balanced disc operates without external power, closing securely under backpressure conditions. The ductile iron body provides structural
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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.

Flanged Silent Check Valve

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

Silent Check Valve Features

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.

Advantages Of Silent Check Valves

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.

Core Features

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.

Reverse Flow Prevention

When flow stops or reverses, the disc closes rapidly with help from.

Spring Assistance

The built-in spring applies back pressure to the disc, speeding up closure.

Optional Damping Design

Some models use a two-stage closing action (fast-close followed by soft-close) to eliminate impact from sudden shut-off.

Noise Reduction

The valve design incorporates optimized disc geometry, spring tension, and sealing materials to minimize vibration and sound during closure.

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

Q: Are you make OEM or ODM product?

A: Yes, if QTY attractive enough, we can create new mould for you, make bodies casting with your logo and your nameplate; if QTY not attractive enough, will be only with your nameplates or labels.

Q: What kinds of valve can you supply?

A: We can supply butterfly valve, ball valve, check valve, gate valve, control valve, brass valve, bronze valve, strainer, valve fittings and so on.

Q: How long is your delivery time?

A: General speaking, we have some stock for regular products, it is 1~2 weeks if the goods are in stock; if not in stock will be 4~8 weeks, depends on quantity.

Q: What's the package and how do you ship the goods?

A: We typically use seaworthy plywood cases for packaging. Shipping is usually done by sea, other shipping methods can also be arranged. Please contact us if you require a different shipping route.

Q: Can you provide the relevant documentation and certificates?

A: Yes, we can provide the necessary documentation and certificates, including the ISO9001,ISO24001, ISO45001, CE, BV, ABS, SIRIM, TUV-SUD etc. We can also provide the Test Report, Certificate of Material Analysis, Certificate of Origin, and other export documents if required.

Q: Do you provide free samples?

A: If samples available in stock, yes, we could offer the free sample to you, but the air cost or courier cost will be on your account.

We're known as one of the most reliable check valve manufacturers and suppliers in China. With a professional production team, we are able to meet the needs of the majority of our customers. Please feel free to buy customized check valve made in China here from our factory.

4 Inch Flanged Check Valve, Cast Iron Silent Check Valve, Quiet Silent Check Valve