Flap Check Valve

The Flap Check Valve Manufacture!

Tianjin Liangfa Technology Co., Ltd. is It is a large-scale valve manufacturing company integrating R&D, production and sales. The main products include butterfly valves, high temperature and high pressure valves, gate valves, check valves, globe valves, regulating valves, ball valves, water supply and drainage valves, marine valves, API valves and other series.

Why choose us

Professional team
We have a professional team that is familiar with product performance, can understand customer needs in a timely manner, and can fully demonstrate product advantages. We are equipped with professional after-sales service personnel to ensure that we respond to user requests within 24 hours and put forward practical solutions.

Our certificates
Our products have passed ISO9001:2000 international quality management system certification, ISO14001:2004 environmental management system certification, and GB/T28001-2001 occupational health and safety management system certification.

Production equipment
We have all kinds of sophisticated large and medium-sized main production equipment and main inspection and testing equipment and instruments.

Specification

Size Range	2″-48″
Temperature Range	To 300F
Pressure Rating	150psi, 175psi, 250psi CWP
Body Material	Ductile iron, cast iron, stainless steel
Seat Material	EPDM, NBR
Connection	Flanged
Accessories	Bare or Backflow Actuator
Available Options	Special materials, custom bolt patterns, custom control accessories

Feature

1. Inclined Seal Plane Structure, Extra Weight in Flap, Can be Dual-Use in Vertical / Horizontal

2. Full-Flow, Low Resistance. Small Opening Pressure Shift

3. No Internal Exposed Metal Parts, No Springs, Not Easy to Be Blocked, Complete Anti-Corrosion

4. Low Open Pressure (<0.01kg/cm2).

5. Increased Wall Thickness, and Are Support to 1.5 Times the Back-Pressure PN

6. Connection with Stainless Steel Bolts, Easy Clean-Up of Internal Opening

Application of Flap Check Valve

Preventing Backflow
The primary purpose of a check valve is to prevent backflow. Doing so protects equipment, prevents contamination, helps maintain system pressure, and prevents water hammer.

Protecting Equipment
Backflow can be devastating to equipment within the system such as pumps, compressors, and other mechanical components. When fluids flow in the wrong direction, they can cause excessive wear, damage seals, or even lead to failures within the system. Check valves are a safeguard that protects this equipment from the harmful effects of backflow.

Preventing Contamination
In systems where different fluids are involved, backflow can inadvertently lead to the mixing of these fluids. This kind of contamination can be a nightmare for industries like food processing or pharmaceuticals where fluid purity is required. Check valves are used to prevent treated water, chemicals, or other substances from flowing backwards and mixing with untreated or incompatible fluids.

Maintaining System Pressure
Check valves also help maintain system pressure by preventing the loss of fluid due to backflow. This is an important feature for applications where consistent pressure is essential, such as HVAC and irrigation systems.

Preventing Water Hammer
Check valves are also an important tool used to help mitigate water hammer. Water hammer results from a water pressure surge in your pipes, often occurring after an abrupt direction change, burst from a previously clogged pipe, or a sudden valve shutdown from within the plumbing system. Installed check valves allow a more controlled deceleration of the fluid flow when a valve closes, dissipating the kinetic energy of the moving liquid. This energy dissipation helps to mitigate the effects of water hammer.

Parts of Dual Plate check valve

Valve Body: The valve body is the main housing of the Dual Plate check valve, usually made of metal. The valve body contains a seat, channel, and connection port to ensure that fluid can flow through and be closed when required.

Disc: Dual Plate check valves have two discs or discs, usually located inside the body. The two flaps are designed to open when the fluid is flowing normally and close when it is flowing in the opposite direction, preventing reverse flow.

Seat: The seat is the part of the disc or gate that is touched when it is closed, usually made of a wear-resistant material to ensure good sealing performance.

Spring: Some Dual Plate check valves may be equipped with springs to assist disc or gate closing and provide additional sealing force.

Bearings: Valves or RAMS are usually connected to the body through bearings to ensure that they move smoothly when opened and closed.

Flanges: Double-disc check valves usually have flanged connections for easy installation in piping systems.

FAQ

Q: Can I have a sample order for valve?

A: Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.

Q: Do you have any MOQ limit for valve order?

A: Low MOQ, 1pc for sample checking is available.

Q: How do you ship the goods and how long does it take to arrive?

A: We usually ship by sea. It usually takes 30 days to arrive. Airline shipping also optional.

Q: How to proceed an order for valve?

A: Firstly let us know your requirements or application.
Secondly we quote according to your requirements or our suggestions.
Thirdly customer confirms the samples and places deposit for formal order.
Fourthly we arrange the production.

Q: Do you offer guarantee for the products?

A: Yes, we offer 1 year warranty to our products.

Q: What is the purpose of a dual plate check valve?

A: Dual plate check valves are mechanical valves that prevent backflow and ensure fluid flow in one direction. For anyone interested in learning more about this significant piece of engineering technology, this article provides a comprehensive overview of its design, principles, and applications.

Q: How long do double check valves last?

A: It's typical to need a new rubber kit every five or so years, but the rest of the double-check valve assembly can last a very long time, potentially over 20 years, with the proper maintenance. But a backflow preventer can need early repair or replacement for various reasons, particularly bad water quality.

Q: What is the flow direction of a dual plate check valve?

A: The Dual Plate Check Valves are designed to be located within the bolt circle of the pipeline flanges. Fitted with a spring, the valves are suitable for both vertical and horizontal lines. Without a spring, the valves can only be used in a vertical line with an upward flow direction.

Q: What is the minimum pressure for a double check valve?

A: In most cases, the tester may continue on to test the second check valve after testing the first check valve, even if the first check valve holds at a value below the minimum value of 1.0 psi. The exception to this is when the reading on the number one check valve is less than 1.0 psi AND the No. 1 shutoff valve leaks.

Q: Where should double check valves be installed?

A: In flats and apartments, there should be a stop tap within each property as well as in the main communal area. A double check valve should be installed above the internal stop tap. An isolation valve must be fitted and be easily accessible on toilets.

Q: What type of check valve is dual plate?

A: Dual Plate Check Valve are available in wafer design, flanged wafer design and extended design with flanged ends having face to face dimensions as that of a swing check valve. The valve has cylindrical body which makes the valve look like any other pipe fitting.

We're well-known as one of the leading flap check valve manufacturers and suppliers in China. Please feel free to buy high quality flap check valve made in China here from our factory. Contact us for more details. fuel check valve, trial order check valve, paid sample check valve