Check Valve

Your Professional Check Valve Supplier

We are a check valve manufacturer,the company is the professional business which producing valves steel casting and valve products. The company has annual production capacity of 6,000 tons of steel casting. It is one of the strongest professional casting enterprises in China. Our products for high temperature and high pressure gate valve,ball valve,globe valve, exhaust valve and other switch valves, high plus three-way valve, high and low pressure bypass valve, control valve, butterfly valve and etc.

Why Choose Us?

Our Factory

Kaifeng Ruiwei Fluid Technology Co., Ltd was established in 2017 with a registered capital of 2 million yuan, 50 employees and 48 technicians. Its main business includes research and development of flow control equipment, technology transfer, technology support ,research and development of new materials for valves.

Production Equipment

In order to manufacture high-quality products, our company is equipped 5T medium frequency furnaces, 2.5T medium frequency furnaces, 0.75T medium frequency furnaces, the resin sand flask molding lines with German technology, multiple shot-blasting machines, heating treatment furnaces, full set of model making and excellent mechanical processing equipment.

Production Market

One of the suppliers of China's five major power generation groups, CNPC, CNP, Daya Bay Nuclear Power Station and Qinshan Nuclear Power Station.

Fast Delivery

The manufacturing process, we providing customers with one-stop service of instant production progress, storage delivery,efficient transportation, on-site installation guidance and debugging.

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Advantages of Check Valve

Control flow of materials

One of the primary advantages of using check valves is that they allow for precise control over the flow of materials. These valves can be adjusted to regulate the flow rate, which is crucial in maintaining the efficiency of industrial processes.

Prevent backflow

Another significant advantage of check valves is their ability to prevent backflow. Backflow occurs when fluid or gas flows in the opposite direction, which can cause damage to equipment or even create safety hazards.

Durability

Check valves are built to withstand harsh industrial environments and can operate under high pressure and temperature conditions. These valves are made from durable materials such as stainless steel, cast iron, and brass, which can withstand corrosion and wear over time.

Low maintenance

Check valves require minimal maintenance due to their simple design. These valves typically have fewer moving parts than others, reducing the likelihood of failure or malfunction.

Types of Check Valve

Double Disc Wafer Check Valve
Double disc check valves are constructed with stainless steel trim for years of trouble-free operation. Double flap check valves can be installed in horizontal or vertical pipelines that carry clean water or air. The valve is not suitable for conveying solids-containing fluids such as untreated sewage or waste water.

Single Disc Wafer Check Valve
Single-disc wafer check valves are designed for installation in flanged piping systems in both horizontal and vertical orientations. Compatible with applications such as gaseous compressors and blowers, water and oil pumps, and biofuels production.

Wafer Lug Type Check Valve
The wafer lug type check valve is an automatic valve whose main function is to prevent the backflow of the medium, the reverse rotation of the pump and the driving motor, and the discharge of the medium in the container.

Butterfly Wafer Check Valve
Butterfly wafer check valve is used to automatically open when media flows and then close when fluids flow backward. A check valve is also referred to as a one-way valve, a non-return valve, or a clack valve. Check valves have the ability to pass fluid in a single direction.

Flanged Wafer Check Valve
Flanged check valves are usually carbon steel or stainless steel bodies; discs and springs are cast stainless steel aisi 316. Sizes range from dn50 to dn1200. Pressure and temperature ranges are in accordance with api 598. Fluids for the retention of aqueous media, oil and natural gas.

Tilting Wafer Check Valve
Tilting disc check valves have round wafer style bodies designed to sandwich between adjacent pipe flanges and conform to most international standards within their respective pressure classes such as ansi 150/300 or pn 25/40/100. The wafer body is compact, lightweight and economical, especially where expensive raw materials are involved.

Application of Check Valve

Plumbing systems

Check valves are used in plumbing systems to prevent backflow of water or sewage, ensuring that water flows in one direction and doesn't contaminate the clean water supply.

Water treatment plants

Check valves are used in water treatment plants to control the flow of water and prevent the backflow of treated or contaminated water into the distribution system.

Oil and gas industry

Check valves are employed in oil and gas pipelines to prevent the reverse flow of fluids, protecting equipment and maintaining the integrity of the pipeline.

Hvac systems

Check valves are used in heating, ventilation, and air conditioning (hvac) systems to maintain the flow of hot or cold water in one direction, ensuring efficient temperature control.

Pneumatic systems

Check valves are used in pneumatic systems to allow air to flow in one direction while preventing air from backflowing into the compressor or other components.

Hydraulic systems

In hydraulic systems, check valves are used to control the flow of hydraulic fluid in one direction, ensuring that it doesn't return to the source or to other parts of the system.

Product Parameter

Type of valve	Check valve, etc.
Standard of product	JB, HG, ANSI, DIN, and other non-standard.
Size range	2"~64" (different valve type, different size, please call for details)
Pressure range	Class 150Lb~Class2500Lb (different valve type, different pressure, please call for details)
Material of body	Carbon steel, stainless steel, alloy steel, special steel etc.
Material of rim	Acc

How to Pressure Test a Check Valve

The valve flap axis of the lift-type check valve is in a position vertical to the horizontal surface. The channel axis and valve flap axis of the swing-type check valve are in a position nearly parallel to the horizontal line.

To conduct a strength test, introduce the test medium from the inlet to the specified value, with the opposite end closed. If there is no leakage from the valve body and cover, then it’s considered qualified.

To conduct a sealing test, introduce the test medium from the outlet. At the inlet, check the sealing surface, stuffing, and gasket. If there is no leakage from those places, then it’s considered qualified.

FAQ

Q: What is the most reliable check valve?

A: The elastomeric duckbill valve is known to be the most reliable and cost-effective check valve. The wide array of styles makes them suitable for both clean and dirty water conditions. One of the most beneficial features is the very low head pressures required to operate. Their unique ability to fold/encapsulate the media ensures a proper seal against backflow. Installs range from residential to industrial and commercial locations.

Q: What is the life expectancy of a check valve?

A: A metal disc valve which pivots on a hinge or trunnion has a life span of 5 to 7 years, compared to 35 -50 years for an elastomeric check valve. Unlike steel bodied check valves, elastomeric rubber check valves require no maintenance or scheduled inspections. The astm 5bc520 a14 c12 eo34 g21 z1 line call is an elastomer that has been specially engineered to ensure long life expectancy.

Q: Can I use a rubber check valve in winter conditions?

A: Yes, a rubber check valve will not be hindered by winter or sub-zero installations. If the valve is installed in a running water application the valve will continue to operate satisfactorily, due to the elastomer’s unique chemical makeup. If unusual circumstances occur, the rubber check valve will freeze without any damage and will return to operation upon thaw.

Q: Can a rubber check valve be used as a pressure relief valve?

A: Rubber check valves can offer superior service as a backflow preventer and can also be considered as a pressure relief valve. They are often used on reservoirs to prevent hydraulic lifting or floating of tanks.

Q: How long do check valves last?

A: A metal disc pivots on a hinge or trunnion to prevent reverse flow. Most larger-scale check valves use this design due to their simplicity. With a life span of five to seven years, these valves are often a component that needs to be replaced frequently.

Q: How much does it cost to get a check valve?

A: How much does a check valve replacement cost? Depending on the size and kind of system, most homeowners spend between $135 and $1,000. Professional work costs between $100 and $400, while the gadget itself costs $35 to $600. A backwater or check valve should cost between $70 and $250, including installation.

As one of the most professional check valve manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy high-grade check valve from our factory. 3 4 inch check valve, internal check valve, knife gate valve pneumatic