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Caleffi 309500 CST Temperature Pressure Relief Valve 3/4" 10 Bar 90°C
£ 39.52 inc vat
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Caleffi 309500 CST Temperature Pressure Relief Valve 3/4" 10 Bar 90°C


Caleffi 309500 CST Temperature Pressure Relief Valve 3/4" 10 Bar 90°C
The Caleffi 309500 CST Temperature & Pressure relief valve controls and limits the temperature and pressure of the hot water contained in a domestic storage heater and prevents it from being able to reach temperatures of over 100°C, with the formation of steam. 

On reaching the settings, the valve discharges a sufficient amount of water into the atmosphere so that the temperature and pressure return within the system’s operating limits.



Operating Principle
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 decrease, the opposite action occurs with the valve
subsequently reclosing within the set tolerances.

Documentation Downloads
 Caleffi 309 Temperature Pressure Relief Valve Technical Brochure