Altecnic / Caleffi 309 Series Pressure & Temperature Relief Valve 1/2" 90°C 7 Bar - 309473CST
Description
This is a stock item. Order by 5pm Monday to Thursday and 4.30pm Friday for same day despatch.
The Altecnic / Caleffi Series 309 Temperature & Pressure Relief Valve is designed to regulate and limit the temperature and pressure within domestic hot water storage heaters. It prevents the water from exceeding 100°C and forming steam. When the pre-set limits are reached, the valve safely discharges water into the atmosphere to restore pressure and temperature within the system’s operational parameters.
The valve opens the outlet on reaching the settings for:
- Temperature: the thermostat compound inside the temperature sensor 1) submerged in the hot water storage heater, expands as the temperature increases. This expansion causes a thrust pin to move and act on the obturator 2) opening the valve. The valve is set to open at temperatures of over 90°C.
- Pressure: the obturator, opposed by a set spring, raises on reaching the pressure setting and opens the outlet completely. The pressure setting is chosen according to the maximum permissible pressure in the system.
As the temperature and pressure drop, the valve performs the reverse action, re-closing automatically once conditions return within the specified tolerances.
Specification
Size: 1/2"
Connections: Male x Ø 15 mm with compression fitting for copper pipe
Materials: DZR
Medium: Water
Set Pressure: 7 Barg
Discharge Rating: 10 kW
Temperature Setting: 90 degC
Probe Length: 97mm
Product Code: 309473CST
Notes: WRAS approved, CE marked