Installation Instructions
Pressure Reducing Valves Product Range

Last Updated

December 4, 2020

Flowflex reserve the right to alter the product ranges and specifications associated with its products without prior notice

Pressure Reducing Valves are a quick way of reducing and stabilising the downstream water mains pressure flow in a system. Valves can be installed both horizontally and vertically. The Pressure of the flow can be pre-set when installing the valve. Flowflex Pressure Reducing Valves are easy to operate using the adjustment screw and have a gauge port.


  • Domestic
  • Commercial
  • Industrial


Unpack and check that the valve is correct for its intended usage. The valve must be compatible with the system design, pressure & temperature requirements and must also be suitable for the fluids it is intended to carry.

Check that the flow paths are clear and that the threads are free from debris.

To ensure ease of operation, maintenance and repair, the location of the valve should be decided during the system design phase. Valves should be appropriately supported to prevent strain on the valve and the pipework.


  • Copper Pipe
  • Pressure Reducing Valve
  • Adjustable Spanner
  • Screwdriver
  • Pipe Cutting Tool
  • Internal & External Pipe Deburring Tool




Flowflex Pressure Reducers have an arrow embossed on the body of the pressure reducing valve. This allows you to correctly set the pressure reducer, ensure the arrow matches the flow direction of the water.

Pressure Reducing valves can work in any orientation.



Loosen the black plastic lock nut located above the Flowflex logo and turn the spring holder.

Do not over pack the threads, PTFE Tape is preferred.



To increase the outlet pressure, turn the spring holder clockwise. To decrease the outlet pressure, turn the spring holder anti clockwise. Make sure the system is closed when adjusting the Pressure Reducing Valve

A screwdriver can be used to make the adjustment easy.

Other Considerations

Tightening Guidance for Pressure Reducing Valves
Torque Settings
Size Torque
1/2" 75 Nm
3/4" 100 Nm
1" 125 Nm
1 1/4" 160 Nm
1 1/2" 200 Nm
2" 250 Nm


We recommend that all systems are throughly tested upon completion. Whenever possible, completed systems should also be flushed to remove debris.


Regular maintenance is the most efficient method of ensuring longer term uninterrupted operational efficiency. It is recommended that within the 1st year that valves should be visually inspected for leaks and that a complete manoeuvre cycle is carried out to check the valve and prevent scale from forming every 3 months. Where a valve is working under extreme conditions it is recommended to check it more frequently.

Hydraulic Installations

In hydraulic based installations, the system may be tested to 1.5 times the working pressure of the system. If higher test pressures are required, then please contact us for further advice.

Any Questions?

Our team is available for you anytime.