Axial surge relief valve

The high-capacity proportional pilot design allows fast response and will eliminate the dangers of a pressure surge. All components operate solely on fluid static pressure to provide ultimate protection.

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Quick response

The high-capacity proportional pilot design allows fast response to surge pressure. This results in a prompt return to stable pressure conditions.

High capacity

The capacity of the axial surge relief valve is extremely high: 50-100% increase compared with a conventional globe valve. Consequently, reduced valve size can be selected.

Unique TVM®

Total Velocity Management® concept: intelligent valve design that carefully manages fluid velocity in all areas of the valve.

No external energy

The pilot-type design eliminates the necessity for an expensive skid-mounted system with nitrogen bottles and associated temperature-compensating devices.

Low maintenance

Due to the absence of any external power supply such as nitrogen, maintenance is reduced to the bare minimum, making the valve ideal for remote or inaccessible locations.


Pilot and surge valve designs are based on simplicity. All components are field-proven to provide maximum protection reliability. They operate solely on fluid static pressure.

Stable operation

The design of the pilot incorporates a snap-acting opening that operates when the set pressure is reached and automatic switching to control in the event of continuing high-pressure conditions.

Product Summary

Type designation
Surge relief valve
RZD - SR - R....
Sizes 6" - 12", rating class ASME 150 - 900, Higher pressures upon request
In preference to
Nitrogen-compensated surge relief valve
Flexible-sleeve surge relief valve
Angle relief valve
Typical applications
Hydraulic pressure surge relief
Transmission lines
Oil-tanker loading terminals
Remote locations
Streamlined flow path through full-port expanded body
Streamlined flow path through full-port expanded body
Axial surge relief valves, Algeria
Axial surge relief valves, Algeria
Axial surge relief valve skid
Axial surge relief valve skid

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Special features

  • Custom designed valve, trim and pilot for each unique safety application.
  • Sophisticated simulation models for the response to pressure surges are available.
  • Anti-cavitation trims are available to avoid foam in spill tanks.

More information

Safety products

Learn more about other safety products.

Product support

In order to ensure you continue to benefit from valves that offer high capacity and safety as standard, our Product Support team offers a range of services to improve your valves in use and to achieve cost savings.