The Altecnic 309 temperature - pressure relief valves are used to control
and limit the temperature and pressure of hot water contained in a
domestic storage cylinder, preventing the water from reaching 100˚C.
When the set conditions are reached, the valve discharges a sufficient
amount of water to allow the temperature or pressure to return within
the system’s operating limits.
The valves have been designed for use on unvented hot water systems.
Component Material Grade
Body DZR BS EN 12165 CW602N
Stem Brass BS EN 12164 CW614N
Spring Steel BS EN 10270-1 SH
Control Knob PA6GF Polymer
Product Size Set Set
Code Pressure Temperature
309440 CST ½” 4 90
309470 CST ½” 7 90
309400 CST ½” 10 90
309500 CST ¾” 10 90
309570 CST ¾” 7 90
309473 CST ½” 7 90
The 309 range of temperature - pressure relief valves meet the
requirements of the European Directive 97/23/CE for pressurised
equipment often referred to PED.
They are therefore classified in Category IV and granted the CE Mark.
The 309 range are certified by Buildcert as complying with the
requirements of BS EN 1490: 2000.