In our series: Product lines in focus we alternately present the most important features and characteristics of our product lines from our business units.

In the area of valves and cryogenic components, today's topic is cold check valves (ccv) which are typically installed in the cryogenic line of vacuum-insulated cold boxes. Common applications are temperatures up to 4K and pressure ratings up to PN25.

Task and function

The check valve ensures that the fluid flows in one direction only.

To prevent unwanted oscillations in the system, the check valves are optionally available with a small bypass bore.

Application areas

• Plasma and fusion research
• Hydrogen infrastructure
• Space infrastructure
• Helium and hydrogen liquefaction plants

Operating principle

A spring presses the sealing head into the seat in the depressurized state. As soon as a low pressure builds up at the inlet of the check valve due to the fluid, the spring force is overcome and the sealing head lifts off the seat. The fluid flows through the check valve. If the pressure is present at the outlet of the check valve, the pressure additionally supports the spring force and presses the sealing head into the seat, thus preventing backflow.

Special suitability in the field of application

The product is maintenance-free. Since it is fully integrated into the line and installed in the coldbox, no unwanted heat input results in the process.

Variable features within the product line

• Nominal width
• Nominal pressure
• Extended welding ends
• Bypass bore

Available versions

• CCV without bypass hole
• CCV with bypass hole

Available accessories

Transport protection and protective caps for delivery. Otherwise, no further accessories are required.

Available spare parts

Since the product is maintenance-free, welded and inaccessible in the coldbox, it requires no spare parts.

Current market approvals

• European Union (CE, Pressure Equipment Directive)
• Eurasian Economic Union (EAC, Pressure Equipment)
• Shipbuilding (DNV)

Current certificates

• Declarations of Conformity / Certificates according to CE and EAC
• Shipbuilding certificates according to DNV

For more information on our cold check valves, please visit our product section, or contact our sales team, we will be happy to help you.