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Swing Check Valve

Swing Check Valve

Category:

Technical Summary:

  • Nominal Size: 2″ to 48″
  • Pressure Class: Class 150 to Class 2500
  • Temperature Range: -29°C to 550°C
  • Design Standards: API 594, BS 1868, ASME B16.34
  • Face to Face: ASME B16.10
  • Flange Dimensions: ASME B16.5, ASME B16.47
  • Butt Weld Ends: ASME B16.25
  • Inspection and Testing: API 598, ISO 5208

Swing Check Valve Construction and Materials:

Body and Pressure Retaining Parts:

  • ASTM A216 WCB
  • ASTM A352 LCB
  • ASTM A351 CF8
  • ASTM A351 CF8M
  • ASTM A890 Grade 4A (F51)
  • ASTM A890 Grade 5A (F55)

Internal Components:

  • Disc: ASTM A216 WCB, ASTM A351 CF8M, ASTM A890 F51
  • Hinge Pin: ASTM A182 F6a, ASTM A276 410, ASTM A479 316
  • Seat Ring: Stainless Steel, CF8M, Duplex Stainless Steel
  • Cover: ASTM A216 WCB, ASTM A351 CF8M

Valve Sealing System:

  • Seat: Metal Seated
  • Body Gasket: Spiral Wound Graphite / Graphite Filled
  • Cover Gasket: Stainless Steel Reinforced Graphite

Functional Design:

In the Swing Check Valve, the process takes place automatically by line pressure and velocity of the fluid. The valve opens up in the case of forward flow as the disc opens out through the hinge pin without any resistance and pressure loss. In case the flow ceases and there is a reversal of flow, the disc closes itself due to gravity and reverse flow pressure.

The design of the simple hinged disc is such that it causes no pressure losses and wear to moving parts and works reliably at high pressures and large diameters in pipelines.

Swing Check Valve Material Grades:

Standard Materials:

Component Material Grade Typical Application
Body Carbon Steel ASTM A216 WCB Oil & gas, power generation
Body Stainless Steel ASTM A351 CF8M Corrosive process media
Body Duplex Stainless Steel ASTM A890 F51 Offshore and seawater systems
Disc Stainless Steel ASTM A351 CF8M Corrosion resistance and sealing
Hinge Pin Stainless Steel ASTM A182 F6a / F316 High strength and wear resistance
Seat Ring Stainless Steel ASTM A182 F316 Bubble tight sealing and long service life

Extended Materials (On Request):

  • Super Duplex Stainless Steel (F53 / F55) for high chloride and offshore service
  • Alloy 20 (CN7M) for sulphuric acid and aggressive chemical applications
  • Hastelloy C276 for severe corrosive process media
  • Monel 400 for seawater and marine applications
  • Aluminium Bronze C95800 for saltwater and desalination plants

Swing Check Valve Additional Technical Information:

  • Valve Type: Swing Check Valve
  • Disc Design: Swing Disc
  • Body Construction: Bolted Cover
  • Operation: Automatic Non Return Valve
  • Flow Direction: Unidirectional
  • Installation: Horizontal pipelines or vertical upward flow
  • Seat Type: Renewable or Integral Metal Seat

End Connections:

  • Flanged as per ASME B16.5 and ASME B16.47
  • Butt Weld as per ASME B16.25
  • Wafer type available for compact installations
  • Special end connections available on request

Industrial Applications of Swing Check Valves:

  • Petroleum and natural gas: Prevention of backflow in pipelines and processing equipment.
  • Petrochemical plants: Prevention of reverse flow in hydrocarbon and process fluids.
  • Oil refinery: Backflow prevention in pumps and other equipment.
  • Water treatment plants: Control of one-way flow in water/wastewater systems.
  • Power plants: Prevention of backflow in steam lines/cooling water systems.
  • Mineral processing plant: Backflow prevention in slurries/process water systems.
  • Marine/offshore application: Backflow prevention in seawater/ballast lines.
  • Desalination plant: Backflow prevention in high pressure water systems.
  • Chemical processing plants: Prevention of backflow in corrosive process fluids.
  • Fire protection systems: Backflow prevention in fire water/utility pipes.

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