Installation Instructions
Isolation Valves Product Range

Last Updated

April 29, 2021

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

Flowflex Isolation Valves are a quick way of isolating flow on 15mm or 22mm copper pipe water or central heating system. Flow is controlled through a quarter turn action which moves the hole in the ball valve inline or out of line with the flow, preventing or facilitating flow as appropriate.

Isolation Valves are regarded as a long term and reliable solution, performing well after long periods of disuse. An advantage of an Isolation Valve is its quick operation which also makes it ideal for emergency applications. Flowflex Brass isolation valves can be supplied with a chrome finish.


  • Domestic
  • Commercial


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
  • Isolation Valve
  • Adjustable Spanner
  • Pipe Cutting Tool
  • Internal & External Pipe Deburring Tool


Check Valve and Tube

Check Valve and Tube

Isolation valves perform best when they are installed in an upright position and should be fitted when the valve is in an open position.

It is important that your pipe is the correct size and length. Failure to do so could impact on the quality of your jointing.



Ensure that the fitting is the correct size for the pipe and that the pipe is cut to length with the ends square and clear from defects.

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

Compression Joint

Compression Joint

Unscrew the nut and olive and slide onto the pipe. Insert the pipe into the fitting as far as the pipe stop. Slide the olive and nut back onto the fitting and tighten by hand until the pipe cannot rotate.

Do not overtighten.

Other Considerations

Tightening Guidance for Isolation Valves
Size Turns
< 28mm 1 1/4 Turns
Torque Settings
Size Torque
15mm 30 - 35 Nm
22mm 45 - 50 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?

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