Pressure Relief Valves

Forget bursting discs or a spring valve, the AKO Pressure Relief Valve is the best and most cost effective valve on the market to protect your pump or motor from over pressure and damage.
waste water valve
waste water valve

How The AKO Pressure Relief Valves work

The AKO Pressure Relief Valves are fitted onto a bypass line of a pump. The Pressure Relief Valves are then charged with air and set closed at the pressure it is required to relieve at. If the associated pump becomes clogged or blocked, causing the line pressure to exceed the pressure at which the valve is set closed at, it will open allowing the product to bypass the pump and equalise the pressure until the blockage is cleared. The Pressure Relief Valve will then reset itself in its ‘closed’ position to the original set pressure.

Available Sizes

  • 10mm – 150mm Screwed Internal Thread Type VMC
  • 65mm – 200mm Flanged Type V/VF

Pinch Valve Body 

  • 65mm – 200mm Aluminum
  • 10mm – 150mm Stainless Steel


  • 10mm – 150mm Screwed Internal BSP, tri-clamp, RJT, weld-on ends, PN10/16 Flanges, ANSI 150 Flanges (VMC type)
  • 65mm – 200mm Flanged PN10/16 (VF type)

Sleeve Materials

Natural Rubber (standard) & Nitrile (for small percentages of oil) are the most commonly used sleeves (others on request)


  • Foot Pump (to inflate the Pressure Relief Valve)
  • Pressure switch (2 switches inside a single housing)

For more information

View the Pressure Relief Valves Datasheet

Pressure Relief Valves Advantages:

Pressure Relief for pumps, water, liquid, sewage/sludge and food industry
Proved reliability in the industry for over 10 years with 1000 plus applications in the UK
Clear and true bore – no blockages
No mechanical parts to get clogged or blocked
Easy and low cost maintenance
Single body casting
When the valve is set (using footpump) to the required pressure, the air supply is no longer needed – perfect for remote areas
The Valve resets itself when a blockage is cleared
No need to strip down the valve after it has relieved
No need to reset after pump starts ups or pressure surges
All Valves fully tested with unique tracking number – 100% leak tight seal
Full technical backup and valve maintenance in house or on site

General PRV Routine Maintenance

AKO UK recommend that the valves are de-pressurised every 8 weeks for a period of 15 minutes. This will ensure maximum life from the sleeve. During the same period the valve should be visually checked to ensure all parts are working. AKO advise checking the PRV evry 4 weeks to make sure it is holding pressure. It is possible that the PRV can lose up to 0.5 BAR within a 4 week period, if this occurs use the foot pump to inflate the PRV to desired pressure.

Sleeve Maintenance

AKO UK Pressure Relief Valves do not require any special maintenance. Only the sleeve is subject to wear and can be quickly replaced on site.

For further information on installation, commissioning instructions, general handling of the PRV, sleeve storage, and pressure switch safety precautions & wiring, please see the PDF PRV Information & Certificate.

Please also see PRV Parts & Maintenance Instructions for a full parts list, sleeve replacement instructions and replacing damaged parts.

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