Pre – Insulated Valves

Pre-insulated Valves for District Heating – V-flex


The V-Flex valve system is the first such pre-insulated valve system to be available for plastic pipe systems and will be welcomed by DHS (District Heating) designers for providing much greater control over heat networks. In effect, it means that the valves can be used to shut down entire networks or to isolate individual streets/ properties making network maintenance and extensions much easier.

V-Flex transforms the ability of operators to control and service PB networks by delivering zonal control via pre-insulated valve technology that can be fusion welded directly to the main network.

The valve innovation includes a key-operated steel ball valve inside a polyethylene casing, insulated by PUR foam, and incorporates PB tails for a fully welded connection to a Polybutene pipe network.

The valves can be specified for single or twin pipe applications and come in a number of chamber sizes (to accommodate depth variation) in order to provide flexibility in network or zonal control. Each chamber provides easy access to the valve and includes a lockable lid as an option.



New Product Range

  • Casing – Polyethylene
  • Insulation – PUR Foam
  • Key operated steel ball valve
  • Polybutene pipe tails for fully welded connection


Valve Details – Properties

Temperature range up to 95°C
Body Carbon Steel P235GH
Ball Stainless Steel 1.4301
Stern Seal FPM
Ball Seal Carbon-reinforced Teflon PTFE+C
Operation Valves can be operated with a T-handle upto DN250




Size Range – To suit PB pipe sizes


Twin Pipe
25mm twin pipe
32mm twin pipe
40mm twin pipe
50mm twin pipe
63mm twin pipe



Single Pipe
25mm single pipe
32mm single pipe
40mm single pipe
50mm single pipe
63mm single pipe
75mm single pipe
90mm single pipe
110mm single pipe

Click on Icon to Download V-flex File 


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