Designed to provide pressure control in systems subject to thermal expansion, the Type 14480 relief valve provides accurate repeatable performance with reseating within 10% of cracking pressure or better (static test conditions).

A unique feature of this valve is the lock down facility which eliminates the need to remove or disconnect the valve during proof testing of the system. Provision is made in the cap for a special lock down screw to be inserted to disable the valve and hold it closed against the increasing

pressures applied during testing of the system pipework and components. This eliminates the need to remove or disconnect the valve during test procedures. When the lock down screw is removed, the valve reverts to its as set condition without further adjustment or recalibration.

The thread in the cap is a non-preferred size, thereby preventing unauthorised insertion of other types of screw. Lock down screws are not provided with each valve to prevent unauthorised use; they are available on request.

Materials

External/wetted parts – 316 stainless steel
Hardened parts – M340 stainless steel
Other parts – CA104 bronze alloy

Drawing