Laminar Pte Ltd Singapore

Laminar Pte Ltd

Valves

Swing Type Check Valves

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Group 1 1

Description

Swing-type check valves play a crucial role in managing the flow of fluids and addressing challenging flow issues. These valves are designed to allow fluid flow in one direction (unidirectional flow) while preventing reverse flow.

The valve body of swing check valves is typically made of durable materials such as ductile iron, ensuring long-lasting performance even in demanding conditions. The swing check valve consists of a hinged disc that swings open to allow fluid to pass through when the pressure exceeds the cracking pressure. When the flow direction changes or the pressure drops below the cracking pressure, the disc swings back into its closed position, effectively blocking any reverse flow.

One of the key advantages of swing check valves is their wide range of applications. They are suitable for various industries and systems where preventing backflow is essential, including water treatment plants, oil refineries, chemical processing facilities, and more.

Regarding flow characteristics, swing check valves offer reliable performance with minimal pressure drop. Their design allows smooth fluid flow without causing significant resistance or turbulence, ensuring efficient operation and reducing energy consumption.

Moreover, swing-type check valves have a valve seat that provides a tight seal when closed. This ensures no leakage occurs during operation, maintaining system integrity and preventing potential damage or loss.

Overall, swing-type check valves are indispensable components for managing fluid flow effectively and addressing challenging flow issues. Their robust construction, wide range of applications, and ability to prevent reverse flow make them an essential choice for industries where maintaining proper fluid direction is critical.

Backflow prevention is routinely achieved via swing check valves, dual plate check valves, or axial-type check valves.

Specifications

PN

10, 16, 25

DN

100-1200

Medium

Water | Wastewater | Seawater

Application

Water treatment applications | Water distribution | Pre-treated sewage | Power plants | Industrial plants.

Specifications

  • Metallic sealing in accordance with EN 16767 / EN 12334 and available with resilient seated option
  • Face-to-face length according to EN 558
  • Flanges and bolt pattern conform to EN1092
  • Corrosion-resistant and wear-resistant metallic sealing seat
  • Epoxy coating internally and externally
  • Body material of Ductile Iron or stainless steel
  • Disk material of Ductile Iron or stainless steel
  • Shaft of stainless steel
  • Available with tilting disc check valve option

FAQ's

A swing-type check valve is a specific type designed to regulate the flow of liquids in a one-way direction. Unlike other types of check valves, the swing check valve operates in a vertical position, allowing for efficient and reliable control of liquid flow.

The main benefit of a swing check valve lies in its design. It consists of a hinged disc that swings freely on a hinge or pivot point. The disc swings open when the liquid flows in the desired direction, allowing for unobstructed passage. However, when there is backflow or reverse flow, the disc swings back into place, effectively blocking any unwanted flow.

This unique design ensures that only one-way flow is permitted, preventing any potential damage or contamination caused by reverse flow. Swing check valves are commonly used in various industries where maintaining proper fluid control and preventing backflow are essential.

The swing-type check valve and the wafer-type check valve serve distinct purposes, each with unique designs and applications.

The swing-type check valve operates with a hinged disc that swings freely, allowing or blocking fluid flow. Installed vertically, it prevents backflow and provides a secure seal when closed.

Conversely, the wafer-type check valve is designed for horizontal piping systems, fitting snugly between flanges. It features a thin disc that seals against the seat to prevent reverse flow. The compact design of wafer valves facilitates easy installation and maintenance.

A crucial difference lies in their operational mechanisms. Swing-type valves rely on gravity and fluid pressure for opening and closing. In contrast, wafer-type valves use the fluid’s flow to open and close as needed.

Moreover, their capacity to handle varying flow pressure conditions (flow rate) sets them apart. Swing-type check valves excel in low-pressure or low-velocity flow applications, as they may slam shut under high-pressure conditions. With their streamlined design, wafer-type check valves are better suited for higher-pressure scenarios, ensuring reliable performance.

Hydro-testing a swing-type check valve is vital to verifying its functionality and reliability. This process involves subjecting the valve to hydraulic pressure to identify potential leaks or weaknesses that could compromise its performance.

To perform a hydro-test on a swing-type check valve, follow these steps:

  1. Gather necessary equipment: Prepare essential tools, including a hydro-test pump or a pressurized water source, pressure gauges, and appropriate fittings for connecting the pump to the valve.
  2. Examine the valve: Before initiating the test, conduct a visual inspection of the swing-type check valve to check for any visible damage or defects. Ensure that all components are correctly installed and in good condition.
  3. Close the valve: Confirm that the check valve’s swing disc is closed before commencing the test. This prevents water from flowing through during testing.
  4. Connect the pump: Attach a suitable hose to the inlet side of the check valve and securely connect it to your hydro-test pump or water source.
  5. Gradually apply pressure: Increase the pressure using your hydro-test pump while monitoring it with pressure gauges. It is vital to stay within the maximum allowable working pressure specified by the manufacturer.
  6. Inspect for leaks: As you apply pressure, meticulously inspect all joints, connections, and seals for any signs of leakage. Pay close attention to flanges, gaskets, and threaded connections.
  7. Maintain test pressure: Sustain a consistent test pressure for a duration recommended by industry standards or manufacturer guidelines. This duration allows ample time to detect any potential leaks or irregularities.
  8. Release pressure and assess results: After completing the test, gradually release pressure from your system while observing for sudden drops in readings or any unusual behaviour from the check valve.
  9. Document findings: Record all pertinent test parameters, including applied test pressures, testing duration, observations during testing (such as any leaks), and the final test outcome.

By adhering to these steps, you can effectively perform a hydro-test on a swing-type check valve, ensuring proper operation. Regular testing and maintenance are crucial for preventing unexpected failures and maintaining the integrity of your system.

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