Swing check valve
Swing check valve is an automatic valve used to prevent the reverse flow of fluid (liquid or gas) in a pipeline.The core component of a swing check valve is a valve disc (or valve flap) hinged inside the valve body. When fluid flows in the correct direction, the fluid pressure pushes the valve disc open, allowing the fluid to flow freely through the valve. When the fluid flow stops or reverses, the valve disc automatically closes due to gravity and the reverse fluid pressure, preventing fluid backflow.
As a swing check valve manufacturer from china, Judberd can supply below types swing check valves
Material Ductile iron
Use water pipeline
Connection flange end
Design ,manufacture
conforms to BS EN12334
Material Ductile iron
Use water pipeline
Connection flange end
Design ,manufacture
conforms to MSS SP-71
Material Ductile iron
Use water pipeline
Connection flange end
Design ,manufacture
conforms to BS5153\DIN3202-F6
material Ductile iron
Use water pipeline
Connection flange end
Design ,manufacture
conforms to MSS SP-71
Material Ductile Iron
Use Water Pipeline
Connection Flange End
Design ,Manufacture
Conforms To
BS EN1074-3/BS EN12334/AWWA C508
Material Ductile Iron
Use Water Pipeline
Connection Flange End
Design ,Manufacture
Conforms To
BS EN1074-3/BS EN12334/AWWA C508
Swing Check Valve With Counterweight
Material Ductile Iron
Use Water Pipeline
Connection Flange End
Design ,Manufacture Conforms To BS 5153
Swing Check Valve Parts
The structure of the swing check valve usually includes the following main components: body, bonnet, disc, hinge mechanism(include Pin,Rocker Arm as below check valve diagram ), sealing parts and connect parts(bolts). Each component plays an important role in the normal operation of the valve.
Body:The body is the main structural part of the check valve, carrying all internal components and providing a passage for the fluid.
Bonnet:The bonnet is mounted on the body of the valve for maintenance and inspection. It closes the opening of the body and protects the internal components.
Disc:The disc is a key component of the check valve, controlling the flow and blocking of fluid. When fluid flows in the correct direction, the disc is pushed open; when fluid flows in the reverse direction, the disc closes automatically.
Hinge Mechanism:The hinge mechanism connects the disc and the body, allowing the disc to swing freely inside the body. It ensures that the disc opens in the direction of fluid flow and closes automatically when the flow reverses.
Seal:The seal ensures the sealing when the disc is closed to prevent fluid leakage. The seal is usually installed on the surface where the disc contacts the body.
Sealing Material selection:
Rubber: Such as EPDM, NBR, etc., suitable for low-temperature and neutral fluids.
Polytetrafluoroethylene (PTFE): Strong chemical corrosion resistance, suitable for chemicals and high-temperature fluids.
Metal Seals: Such as stainless steel, bronze, etc., suitable for high-pressure and high-temperature applications.
Other Components:
Bolts and Nuts: Used to fix the bonnet to the body, usually made of stainless steel or carbon steel.
Gaskets: Used for sealing between the body and the bonnet, usually made of flexible graphite, PTFE, or rubber.
Standard Swing Check Valve
Swing check valve with rocker arm(NO.10) and pin (NO.8)
Flap Type Swing Check Valve
flap check valve with pin (No 5) for flap
Working Principle
Forward Flow: When the fluid is flowing in the forward direction along the pipeline, the fluid pressure pushes the valve disc (also called the valve flap) open to allow the fluid to pass. This design ensures that the fluid can flow unimpeded.
Backward Flow: When the fluid tries to flow in the reverse direction, the fluid pressure causes the valve disc to close. The valve disc typically returns to the closed position by gravity or spring force, thereby preventing fluid from flowing back.
Structural features: The valve disc of the swing check valve is connected to the inside of the valve body by a hinge and can rotate freely. When the fluid is flowing in the forward direction, the valve disc is pushed open; when the fluid is flowing in the reverse direction, the valve disc is pushed back to the closed position.
The advantage of this design is that it is simple in structure, reliable in operation, suitable for most pipeline systems, and especially suitable for applications where it is necessary to prevent fluid backflow.
Forward Flow
Backward Flow
Installation Position
Behind the water pump outlet: The swing check valve should be installed after the water pump outlet to prevent the medium from flowing back and damaging the water pump or system when the water pump stops. Typically, the swing check valve should be installed 0.5-1 meter from the water pump outlet, and this distance can be adjusted according to specific system design requirements.
Behind the boiler steam outlet: The swing check valve should be installed after the boiler steam outlet to prevent steam from flowing back and causing the boiler to be overpressurized.Typically, the swing check valve should be installed 1-2 meters from the boiler steam outlet.
Behind the oil pump outlet: The swing check valve should be installed after the oil pump outlet to prevent oil from flowing back and causing system failure. Typically, the swing check valve should be installed 0.5-1.5 meters from the oil pump outlet.
Installation Steps
Prepare tools and materials:Swing check valve, Pipe wrench, Pipe seal tape or sealant,Gaskets (if required),Cleaning tools (such as a brush or rag)
Determine the installation location:Confirm the installation location and orientation of the swing check valve. Typically, there will be an arrow on the valve body indicating the direction of fluid flow, make sure the arrow points in the direction of fluid flow.
Prepare the pipe connection:Clean the pipe port to ensure there is no debris or dirt.Inspect the pipe port and valve connection for damage and repair if necessary.
Apply the sealing material:Apply a suitable amount of pipe seal tape or sealant to the threaded port of the valve to ensure a proper seal at the connection.
Install the valve:Place the swing check valve on the pipe, making sure the valve is aligned with the connection port on the pipe.Use a pipe wrench to tighten the valve, but do not over-tighten to avoid damaging the valve or pipe.
Install the gasket (if required):If a gasket is needed, make sure the gasket is placed between the valve and pipe and is aligned correctly.
Check the installation:Inspect all connection points to ensure the valve is installed securely and not loose.Confirm the valve is installed correctly with the arrow pointing in the direction of fluid flow.
Test:Test the valve with fluid flow and observe the operation of the valve.Check for leaks and ensure the valve can open and close properly when in operation.
Record and maintain:Record the installation date and relevant information for the valve for future maintenance and inspection.Regularly check the valve to ensure it is operating properly over the long term.
By following these steps to install a swing check valve, you can ensure the valve is installed correctly and operates as intended. If there are parts that are unfamiliar, it is recommended to consult us or refer to our installation manual.
Application
Swing check valves, because of their structural and performance characteristics, are widely used in many applications. The main reasons include their low pressure drop, large flow capacity, and adaptability to fluid flow rates and pressure changes. Here are common applications and why swing check valves are chosen over other check valves:
Water Treatment Systems:The design of swing check valves allows water to flow smoothly through water treatment systems, reducing water hammer effects and being less sensitive to debris, making them suitable for dirty water.So swing check valve are widely used in municipal water supply networks, sewage treatment plants, industrial water treatment systems.
Pumping Stations:Swing check valves can close quickly when a pump stops, preventing backflow, protecting pumps and systems, and their low pressure drop characteristics help maintain system efficiency.be installed on outlets of various pump stations, including water pumps, oil pumps, chemical pumps, etc.
HVAC Systems:Swing check valves can handle temperature changes in hot and cold water, avoid noise and water hammer effects caused by changes in flow rate and pressure, and meet the needs of HVAC systems.be widely used on central air conditioning systems, heating systems, refrigeration systems.
Fire Protection Systems:In fire protection systems, the fast response and reliable anti-backflow function of swing check valves ensure that water does not flow back into the water supply system in emergencies, maintaining the high reliability of fire protection systems.Be widely used on fire pump rooms, fire protection piping systems.
Industrial Process Control Systems:Swing check valves are suitable for a variety of media, including liquids, gases, and steam, providing reliable protection against backflow in complex process flows, maintaining system safety.Be widely used on chemical plants, oil refineries, natural gas processing plants.
Boiler Systems:In boiler systems, swing check valves can withstand high temperatures and pressures, prevent boiler water from flowing back into the water supply system, and ensure the safe operation of boilers.Be widely used in industrial boiler rooms, heating plants.
Pharmaceutical and Food Industries:Swing check valves are simple in structure, easy to clean, suitable for pharmaceutical and food industries with high hygiene requirements, preventing backflow of products or raw materials, ensuring the hygiene and safety of production processes.Be widely used in pharmaceutical plants, food processing plants.
Compressed Air Systems:Swing check valves can quickly respond to changes in the flow of compressed air, prevent backflow, protect compressors and other equipment, and ensure the stability of the system.Be widely used in Industrial compressed air systems, pneumatic control systems.
Marine Engineering and Ship Systems:Swing check valves are versatile and can prevent backflow in seawater and freshwater systems, protecting ships and marine engineering equipment, ensuring system reliability.Be widely used in ship water supply systems, seawater desalination units.
Oil Fields and Mining:Swing check valves can handle media containing solid particles, prevent water, oil, or mud from flowing back, protect pumps, and pipeline systems, and meet the harsh conditions of oil fields and mining.Be widely used in Oil well drainage systems, mine drainage systems.
Why choose swing check valves over other check valves?
Low pressure drop: Swing check valves are simple in design, have smooth flow paths, low pressure drops, and help maintain system efficiency.
Wide range of applications: Can handle multiple media, including liquids, gases, and media containing solid particles.
High reliability: Performs well in preventing backflow, quickly responding to changes in system pressure and flow rates.
Easy maintenance: Simple in structure, easy to inspect and maintain.
Reduces water hammer effects: Its design helps reduce water hammer effects when fluid is suddenly stopped or flows in reverse, protecting pipe systems.
Taking all these characteristics into consideration, swing check valves perform well in many applications requiring prevention of backflow, showing their superiority and reliability and becoming the ideal choice for these applications.
Swing Check Valve with Counterweight
The Role of Counterweights
Improves Closing Speed and Performance:Counterweights can increase the closing force of the valve disc with their weight to improve the closing speed of the valve disc. This is particularly important for preventing fluid backflow, especially in systems with fast fluid velocities or high fluid inertia. Rapid closing can reduce water hammer (the shock wave generated when fluid stops or changes direction abruptly) to protect pipeline systems and the valves themselves.
Regulates the Dynamic Response of the Valve:The presence of counterweights allows the valve to have a more stable dynamic response when flow rates change. For example, in the event of a sudden decrease in flow rate, counterweights can help the valve disc return quickly to the closed position to reduce the risk of backflow.
Ensures Effective Closing of the Valve at Low Flow Rates:At low fluid flow rates, counterweights can help the valve disc overcome inadequate fluid pressure to ensure the valve closes effectively.
The Working Principle of Counterweights
Counterweights are usually connected to the valve disc or its rotation axis of the swing check valve. When the valve is in the open position, fluid flow pushes the valve disc open, and the counterweight is lifted. Conversely, when fluid stops flowing or tries to flow back, the fluid pressure drops, and the counterweight quickly pushes the valve disc back to the seat position by gravity to close the valve.
The specific working process is as follows:
Normal flow:The fluid flows in the correct direction, pushing the valve disc open, and the counterweight is lifted to the balance position.
Reverse flow or reduced flow rate:When fluid stops flowing or tries to flow back, the fluid pressure decreases, and the valve disc quickly falls back to close the valve under the action of the counterweight.
Counterweight adjustment:By adjusting the size and position of the counterweight, the closing speed and force of the valve disc can be changed to adapt to the needs of different fluid systems.
The role of counterweights in swing check valves is mainly to improve the performance of the valve by increasing the closing force and speed, preventing backflow, and reducing water hammer. It guarantees that the valve works effectively in various operating conditions, improving system reliability and safety.
