Check Valves

The Check Valves manufacture!

Zhejiang AODEHUA Technology Co., Ltd Aodehua Group specialized in the production of brass water plumbing valves for more than 20 years.Set development, forging, manufacturing, testing, sales as one, superb technology, stable and reliable quality make "AOHUA" products win the favor of consumers.

Why choose us

Quality Control

Test each product one by one. Strict quality control ensures reliable and stable quality.

Productive Capacity

Monthly productivity reaches 1 million sets, fast and on time delivery.

Our Services

Rapid response communication service from pre-sale to post-sale.

Specification Of Check Valves

Product Size	3mm, 6mm, 8mm, 10mm, 1/8″, 1/4″, 3/8″. 1/2″
Both End Connection	O.D. (Ferrule)
Body Material	SS316
Max. Working Pressure	3000PSI
Cracking Pressure	3PSI
Seal Material	Viton
Medium Temperature	–23°C to 191°C
Fluid Coeficient	(1/8″~0.16). ( 1/4″ 6mm, 8mm~0.47). ( 3/8″~1.47). (1/2″, 10mm~1.68)

Valve Type	Mechanism	Common Materials	Ideal Applications	Special Features
Swing Check Valves	Swinging disc	Cast iron, stainless steel	Low pressure, wide range of fluids	Simple, effective
Lift Check Valves	Vertical lift disc	Carbon steel, stainless steel	High pressure systems	Handles aggressive media
Dual-Plate Check Valves	Two swinging plates	Cast iron, stainless steel	Compact spaces, both orientations	Lightweight, better leak tightness
Non-Slam Check Valves	Spring mechanism	Bronze, stainless steel	High flow velocity systems	Reduces water hammer
Tilting-Disc Check Valves	Tilting disc	Cast iron, carbon steel	Fast response required, low resistance	Quick closure, minimal drop

Advantages of Check Valves

Preventing fluid contamination:

Check valves help maintain a clean and uncontaminated flow of fluids by preventing backflow.

Reducing pressure surges:

Check valves reduce pressure surges that could occur if fluids or gases are forced to flow in the opposite direction.

Improving system efficiency

Check valves help maintain the efficiency of a system by ensuring a steady flow of fluids or gases in one direction.

Saving space

Check valves come in various compact designs that allow for easy installation in tight spaces.

Reducing maintenance

Check valves are relatively low maintenance and can last for a long time if the right type is selected for the application.

Application of check valve

Water treatment systems: Check valves are extensively used in water treatment systems to prevent the backflow of contaminated water into the clean water supply.

Pumps and compressors: Check valves to prevent fluid that has already been pumped or compressed from flowing back through the system, which could damage the equipment.

HVAC systems: Check valves are used in HVAC systems to prevent the backflow of refrigerant and other fluids, which can cause damage to the equipment and increase costs.

Oil and gas industry: Check valves are important components of oil and gas pipelines, where they are used to prevent the backflow of oil or gas, which could create safety hazards and reduce the efficiency of the system.

Chemical and food processing: Check valves are used in chemical and food processing systems to maintain the flow of fluid in one direction and prevent cross-contamination between different fluids or processes.

Fire protection systems: Check valves are used in fire protection systems to ensure that water can only flow in one direction, from the water source towards the fire, preventing contamination of the fire suppression system.

Materials Used to Make Check Valves

Polyvinyl Chloride (PVC): PVC is corrosion resistant and flexible. The smooth surface of PVC allows the check valve parts to move easily.

Chlorinated Polyvinyl Chloride (CPVC): CPVC has the same qualities as PVC but is able to endure high temperature applications.

Bronze: Bronze can be used for low and medium pressure applications, be cast in complex configurations, and is corrosion resistant.

Brass: Brass has the same abilities as bronze as well as the same machinability and is less expensive than bronze.

Cast Iron:Cast iron check valves are used for hot and cold water, HVAC, steam, gas, and utility services due to its excellent corrosion resistance.

Ductile Iron:Ductile iron has more than 3% carbon so it can be bent and shaped easily. It is stronger than cast iron and is easier to form into check valves.

Iron: Iron is used for steam, water, oil, and gas applications. It can endure a wide range of temperatures and pressures. Its excellent performance balances its high cost.

Stainless Steel: Stainless steel is corrosion resistant, durable, and can be used in harsh conditions, including chemical applications.

Polypropylene (PP):PP is used to make check valves due to its exceptional resistance to corrosion, which is superior to CPVC and PVC.

Polyvinylidene Difluoride (PVDF):PVDF plastic is used in applications where exceptional purity and resistance to acids, solvents, and hydrocarbons are a necessity.

Cast Steel:Cast steel is used to produce check valves due to its sudden impact resistance without deforming, breaking, or bending. It can also be easily shaped to any type of check valve.

Our factory

Zhejiang AODEHUA Technology Co., Ltd. is located in the beautiful and rich East China Sea - Yuhuan City.
It is a famous coastal city in China for the production of water heating valves. Production has a long history, strong technical force.
38 kilometers away from Wenzhou airport, land and sea and transportation is very convenient.

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Certification

productcate-428-618 productcate-427-618

FAQ

Q: What are the rules for check valves?

A: To reliably prevent back flow and reduce water hammer, it's best to install check valves just after the pump discharge, keeping the five diameter rule in mind when doing so. Avoid installing immediately after elbows, as these can create severe turbulence and, in turn, valve chatter, instability, and eventual failure.

Q: When there is a problem with check valves?

A: A strange noise can also be a sign of 'water hammer' which is a high-pressure surge that occurs when the fluid comes to a stop or changes direction, often causing the disc to slam into the valve. Valves can also start to 'chatter' with repeated opening or closing due to oversizing.

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: What is the minimum flow of a check valve?

A: To keep a check valve fully open typically requires a fluid velocity of 10 to 12 feet per second, for liquids such as water. To start the opening of the check valve, the “cracking pressure,” requires about 4 to 8 feet/second.

Q: What is the formula for check valve?

A: The check valve permits flow in one direction and blocks it in the opposite direction. This figure shows the typical dependency between the valve passage area A and the pressure differential across the valve Δ p = p A − p B .

Q: What is the maximum pressure for a check valve?

A: The differential pressure between the outlet and inlet, at which no flow is passing through the valve. Maximum allowable back pressure is rated to 1000 psi (69 bar) for 1/4, 200 psi (14 bar) for 3/8 to 1".

Q: What is the k value of a check valve?

A: The K-value provided by the check value, also known as a K factor or loss coefficient, allows for the calculation of pressure loss through the valve. This applies to a particular fluid, flowing at a specified velocity.

Q: Are check valves automatic?

A: Check valves are self-contained, automatic valves, which are used to prevent the reversal of flow in a line. When open and under flow pressure, the checking mechanism will move freely in the media, offering very little resistance and minimal pressure drop.

Q: What is the principle of check valve?

A: The check valve working principle is based on allowing flow in one direction and automatically preventing flow in the reverse direction. Check valves are one of the only valves that are completely self-automated and do not require human interaction to manually cycle them.

As one of the leading check valves manufacturers and suppliers in China, we warmly welcome you to wholesale bulk discount check valves from our factory. All customized products are with high quality and competitive price. For quotation and free sample, contact us now.

Check Valves, One Way Non Return Check Valves, Flanged Check Valve