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Check Valves

Ductile Iron Swing Check Valves

Check Valve Detail

The primary function of a Check Valve is to prevent backflow, enabling the flow control of media and ensuring that only a one-way direction of fluid flow is possible. If the flow reverses for any reason, such as pressure, velocity changes, or water hammer, the spring or arm-operated disc automatically closes.


Ductile Iron Swing Check Valve VT493N

Weight: 11kg – 235kg

Sizes: DN 50 – 350

Class: 150

Pressure: PN16

Temperatures: -10°C to 400°C

Cast Iron Dual Plate Wafer Check VT493

Weight: 1.5kg – 172kg

Sizes: DN 50 – 600

Class: 150

Pressure: PN16

Temperatures: -10°C to 120°C

Cast Iron Swing Check Valve VT493

Weight: 11kg – 461kg

Sizes: DN 50 – 350

Class: 125

Pressure: PN14

Temperatures: -10°C to 230°C

Check Valve Price and Stock Availability

Please click here to review Valvetech T&C’s. Price and Stock are subject to change. All prices Exclude Drilling and are Exclusive of VAT. Last Updated: 20/05/2024


With a Swing Check Valve, the hinged-disc swings open during a forward motion of media which allows for minimal resistance of flow. The Dual Plated Wafer Check Valve, however, has two spring-loaded plates that open swiftly and independently of each other. Because both mechanisms are self-actuating, there is no need for mechanical or electronic control systems, making these devices a cost-effect alternative to complex installations.

They can be installed in various positions, both horizontally, diagonally, or vertically, and are secured either via drilled flanges, or seated between the flanges of connecting pipes. The main consideration for the installation is the flow of media, the direction of which is indicated on the valve itself for ease of use and understanding. 


  • Prevents Backflow by immediately closing the valve, therefore blocking the backwards regression of media back into the system,
  • No Electric or Manual Intervention as changes in pressure or media flow direction create a passive yet immediate gravitational response  
  • Reduces Water Hammer impact when a sudden unexpected pressure surge occurs
  • Low  Maintenance due to the efficient design and fewer moving parts. The self-actuating mechanism has no complex componets
  • Versatile Applications due to their ability to operate in high-and-low-pressure water, oil, gas, wastewater and plumbing systems


  • Limited flow control as they do not have a variable control mechanism; consider a Butterfly Valve if flow control is a requirement
  • Potential for clogging due to the arm or stem being the anchor for the disc; consider a Gate Valve if this is a concern
  • Pressure Drops as a closed Check Valve can lead to drop in pressure in the system. Consider a Gate Valve if this is a concern
  • Loud banging noise when a water hammer occurs after a sudden change in flow direction. Consider a Globe Valve if this is a concern

Common Industry Uses:

  • HVAC Systems to regulate fluid flow and prevent the reverse flow of refrigerants or other fluids
  • Water Treatment purification plants to manage the flow of water, preventing backflow and contamination
  • Mining and Ore Processing to regulate the flow of slurry and other fluids, ensuring efficient processing and preventing damage to equipment
  • Pulp and Paper Industry to control the flow of liquids and gases involved in various production processes
  • Power Generation where maintaining the direction of fluid flow in steam, water, or gas systems is critical

Check Valve Specifications


Petrochemicals and Petroleum, Refineries, Primary Energy, Agriculture, Water Works, HVAC


Water, Oil, Gas, Steam

Priority Media

Acetylene, Borax, Castor Oil, Caustic Soda, Detergents, Diethylene Glycol, Gasoline, Hydraulic Oil, Linseed Oil, Methyl Acetone, Nitrogen, Oxygen, Mercury, Propane Gas, Sodium Sulphate

For full Check Valve list, see Media Compatibility Table

Also Known As

Check Valve

Non-return Valve

Stop Valve

One-Way Valve