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Check Valves

Check Valve

Check valves are designed to allow flow in one direction only, preventing backflow in case the fluid in the line reverses direction.

These automatic valves do not require any operator – manual or automatic – to open and close, making them ideal for situations where there is a loss of electricity or pneumatic air supply.

When selecting a check valve, it is essential to consider the type:

  • Piston-Disc/Forged Ball Check Valve: Offers excellent resistance and reliable performance, suitable for high-pressure and high-temperature applications.
  • Forged Swing Check Valve: Ideal for heavy fluids, ensures a tight seal with a robust and durable construction.
  • Cast Swing Check Valve: Suitable for less demanding applications, offers a balance between cost and performance.
  • Dual Disc Check Valve: Suitable for a wide range of pressure, temperature, and environmental applications.
  • Spring Check Valve: Provides fast and reliable closing action, suitable for plants requiring immediate responses.

PISTON/BALL CHECK VALVE

Construction: Piston (straight or Y body), Ball (straight or Y body)

Construction: Bolted, Welded, for high pressures

Main Design Standards: ASME B16.34, API 602, BS 5352, ISO 15761, API 6A

Pressure Classes: ANSI 150#-4500#

Sizes: from ½” to 2”

API 6A Pressure Classes: 3000-15000

API 6A Sizes: from 1 13/16” to 11”

Connections: SW, NPT, BW, RF, RJ

Materials: Carbon Steel, Stainless Steel, Alloy Steel, and Exotic Materials

SWING CHECK VALVE FORGED

Construction: Swing

Construction: Bolted, Welded, for high pressures

Main Design Standards: ASME B16.34, API 602, BS 5352, ISO 15761

Pressure Classes: ANSI 150#-4500#

Sizes: from ½” to 2”

API 6A Pressure Classes: 3000-15000

API 6A Sizes: from 1 13/16” to 11”

Connections: SW, NPT, BW, RF, RJ

Materials: Carbon Steel, Stainless Steel, Alloy Steel, and Exotic Materials

SWING CHECK VALVE CAST

Construction: Swing

Construction: Bolted, Welded, for high pressures

Main Design Standards: ASME B16.34, API 6A, BS 1868

Pressure Classes: ANSI 150#-4500#

Sizes: from 2” to 24”

Connections: BW, RF, RJ

Materials: Carbon Steel, Stainless Steel, Alloy Steel, and Exotic Materials

DUAL PLATE CHECK VALVE

Construction: Dual Disc

Construction: Bolted, Welded, for high pressures

Main Design Standards: ASME B16.34, API 594

Pressure Classes: ANSI 150#-4500#

Sizes: from 2” to 24”

Connections: Wafer and Lug

Materials: Carbon Steel, Stainless Steel, Alloy Steel, and Exotic Materials

Check valves are used with various process fluids, including liquids, gases, steam, and condensate.

Typical applications include:

  • Pump and Compressor Discharge
  • Header Lines and Vacuum Breakers
  • Condensate Lines and Chemical Feed Pumps
  • Cooling Towers and Loading Racks
  • Nitrogen Purge Lines and Boilers
  • HVAC Systems and Utilities
  • Pressure Pumps and
  • Drainage Pumps
  • Wash Stations and
  • Injection Lines

Check valves are flow-sensitive and rely on the fluid in the line to open and close. The internal disc allows flow to pass forward, opening the valve, and begins to close when the flow decreases or reverses.

If the flow is insufficient, the disc may remain in an intermediate position, causing wear, failures, and increased pressure drop.

The construction of check valves is simple, with few components such as body, seat, disc, and cover. The internal sealing of the disc and seat relies on the counter-pressure of the fluid, with metallic sealing surfaces generally allowing for a small leakage. Elastomers, such as Buna-N and Viton, provide a tight seal, making them ideal for air/gas media.

MAGVALVES offers a complete range of check valves designed to ensure reliability and durability. We provide customized solutions to meet the specific needs of each application, always ensuring the highest quality and fast delivery service.