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


ECV15 (Copy)Expansion Control Valve

The Expansion Control Valve (ECV) is designed to relieve the increase in pressure caused by the water expansion during the normal heating cycle. 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 Pressure Temperature Relief valve (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 ECV Valves PTR Valves
Orange ECV 15/1400
Black PTR 15/700
Blue ECV 15/700 PTR 15/850
Blue ECVE20/700 PTRE 20/850
Green ECV15/850 PTR 15/1000
Green ECV15/850 PTRE 15/1000
Green ECVE20/850 PTRE 20/1000
Red ECV15/1200 PTR 15/1400
Red ECV15/1200 PTRE 15/1400

Rating Plate Colours

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

ECV Brochure

ECV25 Brochure