Tri-Function Air Valves​

Tri-Function air valves serve the purpose of protecting your other valve and pipework from over, or under, pressurization. 

The three functions are firstly, the release of large volumes of air in the event of a system being filled. Secondly, in the even of a system being drained, the valve will allow large volumes of air to be taken in and prevent a vacuum. Thirdly, small accumulations of air to be released when the system is pressurized. 

Varying sizes, pressure ranges, materials and approvals available on request.