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About Us

Ningbo Baodi Plastic Valve Co., Ltd. is professional China CHECK VALVE Manufacturers and CHECK VALVE suppliers.Founded in 2006, the enterprise has established ISO9001 quality system to support the quality guideline: supported by Technology, Meticulously Researching, Professionally Manufacturing and Permanently Creating New Records. The first class production equipments and advanced manufacturing skills are introduced at the same time, involving KRAUSS-MAFFEL CPVC pipe production line and Haitian CPVC Plastic Molding Machine of 2800 tons. In order to ensure the quality of wholesale CHECK VALVE, the raw materials like CPVC and PVDF are wholly imported from Noveon (USA) and Atofina (France).

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We aim to meet all our customers’ request by good quality and service. Welcome your inquiry and visits!

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Industry knowledge expansion about this category

Check valves, also known as non-return valves or one-way valves, are essential components used in piping systems to allow fluid flow in one direction while preventing backflow in the opposite direction. These valves play a crucial role in maintaining flow efficiency, preventing damage, and ensuring the safety and functionality of various industrial processes. Check valves come in different designs and configurations, but they all share the common functionality of allowing flow in one direction and blocking it in the reverse direction.

Key Components and Operation:

Body: The body of a check valve is the main housing that contains the internal components. It is typically made of materials such as cast iron, stainless steel, brass, or PVC, depending on the intended application and the fluid being handled. The body is designed to withstand pressure and maintain structural integrity.
Disc or Flap: The disc, also referred to as the flap or the clapper, is the movable component of the check valve. It is hinged within the valve body and swings or lifts away from the seat to allow fluid flow in the forward direction. When the flow stops or reverses, the disc returns to its closed position, sealing against the seat to prevent backflow.
Seat: The seat is the sealing surface against which the disc makes contact to form a tight seal when the valve is closed. The seat is typically made of resilient materials such as rubber or elastomers to ensure effective sealing and prevent leakage.
Spring (if applicable): Some check valves incorporate a spring mechanism to assist in closing the valve quickly and prevent water hammer or fluid pressure surges. The spring helps maintain the disc in the closed position when there is no forward flow, enhancing the valve's efficiency and preventing backflow.

Advantages of Check Valves:

Prevent Backflow: The primary function of check valves is to prevent fluid backflow, ensuring the flow of fluid occurs in one direction only. This feature protects pumps, equipment, and pipelines from potential damage caused by reverse flow or pressure surges.
Simple Design and Operation: Check valves have a relatively simple design, consisting of a few components, making them easy to understand and operate. Their straightforward functionality allows for quick installation and maintenance.
Low-Pressure Drop: Check valves have minimal pressure drop when the valve is fully open, ensuring that the flow is not significantly impeded. This characteristic contributes to efficient flow rates and reduces energy consumption.
Diverse Applications: Check valves are used in various industries and applications, including water supply systems, wastewater treatment plants, oil and gas pipelines, chemical processing plants, HVAC systems, and many more. They provide crucial protection against backflow in both residential and industrial settings.

Types of Check Valves:

Swing Check Valve: This is one of the most common types of check valves. It consists of a hinged disc that swings on a pivot or hinge. When the flow is in the desired direction, the disc swings open, allowing fluid to pass through. When the flow reverses, the disc swings back and closes, preventing backflow. Swing check valves are suitable for applications with moderate to high flow rates.
Lift Check Valve: Lift check valves use a vertically moving disc or piston that lifts off its seat to allow flow in the desired direction. When the flow reverses, the disc or piston settles back onto the seat, preventing backflow. Lift check valves are typically used in applications with lower flow rates and where a tight seal is required.
Ball Check Valve: Ball check valves feature a spherical ball as the closing element. The ball moves freely within the valve body, allowing flow in one direction. When the flow reverses, the ball is pushed against the seat, creating a seal and preventing backflow. Ball check valves are commonly used in applications with moderate flow rates and can handle slurries and solids.
Diaphragm Check Valve: Diaphragm check valves utilize a flexible diaphragm as the closure element. The diaphragm is pushed away from the seat when the flow is in the desired direction, allowing fluid to pass through. When the flow reverses, the diaphragm returns to its original position, creating a seal and preventing backflow. Diaphragm check valves are suitable for applications where a tight seal and minimal pressure loss are required.
Stop Check Valve: Stop check valves combine the features of a lift check valve and a globe valve. They have a disc or piston that can be lifted off the seat to allow flow like a lift check valve. However, they also have a mechanism that allows them to be closed manually like a globe valve. This type of check valve offers the flexibility to be used as both a check valve and an isolation valve.