Heating Control Valves
  • PTR
    Pressure and Temperature Relief Valve
  • ECV
    Expansion Control Valve
  • TVA
    Tempering Valve Assemblies Standard
  • TVA – HP
    Tempering Valve Assemblies (High Performance)
  • TCV
    Temperature Control Valve - Standard
  • TMV
    Thermostatic Mixing Valve
  • TMV – PIB
    Thermostatic Mixing Valve - Plumbed In Box
  • Hi-Flo 25
    Hi-Flo 25 Mixing Valve
    TRI-SET Selectable Pressure Limiting Valve
  • PRV
    Pressure Reduction Valve
    Non Return Isolation - Pressure Reduction Valve Combination
  • PRVB
    Pressure Reduction Valve Boundary
  • PRVB20-BV20
    Boundary Pressure Reduction Valve
  • QPL-20
    Noise Reduction Valve: QPL-20
    Non Return & Isolating Valves


PTR15 (Copy)Pressure and Temperature Relief Valve

The Pressure and Temperature Relief valve (PTR) is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle. The valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut-out device cease to operate correctly, the water will overheat.

The temperature probe will then open the PTR valve and discharge hot water to the drain line. It is recommended that an ECV be fitted to the cold water supply line. This will relieve cold water, not hot water, during the heating cycle, saving energy and increasing the life of the PTR. Some local governments make it mandatory to install an ECV in the cold water line. PTR and ECV valves are safety valves and should be replaced every 4 years.

Inlet Pressure Control

High pressure may cause excessive discharge and possible premature failure of the operating relief valve (see table). The maximum water pressure usually occurs during the night, at the time of lowest water usage. In any mains pressure water heater installation if the water pressure exceeds 80% of the nominal set pressure of the operating relief valve, a Pressure Limiting Valve must be fitted to the cold inlet. If a cold water expansion control valve is fitted it will have a lower set pressure than the PTR valve and therefore will be the main operating relief valve.

Colour Rating Plate PTR Valves ECV Valves
Orange ECV 15/1400
Black PTR 15/700
Blue PTR 15/850 ECV 15/700
Blue PTRE 20/850 ECVE20/700
Green PTR 15/1000 ECV15/850
Green PTRE 15/1000 ECV15/850
Green PTRE 20/1000 ECVE20/850
Red PTR 15/1400 ECV15/1200
Red PTRE 15/1400 ECV15/1200

Rating Plate Colours

The valve rating plates are colour coded to make selecting the correct valve easy. Simply match the PTR valve to an ECV with a rating plate of the same colour.



PTR Brochure

PTR25 Brochure