{"product_id":"altecnic-caleffi-309-series-pressure-temperature-relief-valve-3-4-90-deg-c-10-bar-309500cst","title":"Altecnic \/ Caleffi 309 Series Pressure \u0026 Temperature Relief Valve 3\/4\" 90°C 10 Bar - 309500CST","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cspan style=\"color: #ff0000;\"\u003eThis is a stock item. Order by 5pm Monday to Thursday and 4.30pm Friday for same day despatch.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe Altecnic \/ Caleffi series 309 temperature \u0026amp; 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.\u003c\/p\u003e\n\u003cp\u003eThe valve opens the outlet on reaching the settings for:\u003cbr\u003e\u003cbr\u003e- \u003cstrong\u003eTemperature:\u003c\/strong\u003e as the water temperature rises, the thermostat compound within the temperature sensor—submerged in the hot water storage heater—expands. This expansion drives a thrust pin that acts on the obturator, triggering the valve to open. The valve is calibrated to activate at temperatures exceeding 90°C.\u003cbr\u003e\u003cbr\u003e- \u003cstrong\u003ePressure\u003c\/strong\u003e: counteracted by a pre-set spring, the obturator lifts upon reaching the defined pressure threshold, fully opening the outlet. This pressure setting is selected based on the system’s maximum allowable pressure.\u003cbr\u003e\u003cbr\u003eAs the temperature and pressure decrease, the opposite action occurs, with the valve subsequently re-closing within the set tolerances.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/4\"\u003cbr\u003e\u003cstrong\u003eConnections:\u003c\/strong\u003e Male x Ø 22 mm with compression fitting for copper pipe\u003cbr\u003e\u003cstrong\u003eMaterials:\u003c\/strong\u003e DZR\u003cbr\u003e\u003cstrong\u003eMedium:\u003c\/strong\u003e Water\u003cbr\u003e\u003cstrong\u003eSet Pressure:\u003c\/strong\u003e 10 Barg \u003cbr\u003e\u003cstrong\u003eDischarge Rating:\u003c\/strong\u003e 25 kW\u003cbr\u003e\u003cstrong\u003eTemperature Setting:\u003c\/strong\u003e 90 degC\u003cbr\u003e\u003cstrong\u003eProbe Length:\u003c\/strong\u003e 99mm\u003cbr\u003e\u003cstrong\u003eProduct Code:\u003c\/strong\u003e 309500CST\u003cbr\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e WRAS approved, CE marked\u003cbr\u003e\u003c\/p\u003e\n\u003ch5\u003eDatasheets\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0812\/3452\/6525\/files\/Altecnic-Caleffi-Pressure-Temperature-Relief-Valve-3-4-Inch-90DegC-10-Bar-309500CST-Datasheet.pdf?v=1708084686\" title='Altecnic \/ Caleffi 309 Series Pressure and Temperature Relief Valve 3\/4\" 90°C 10 Bar - 309500CST Datasheet' target=\"_blank\"\u003eAltecnic \/ Caleffi 309 Series Pressure and Temperature Relief Valve 3\/4 90°C 10 Bar - 309500CST Datasheet\u003c\/a\u003e\u003c\/p\u003e","brand":"Altecnic\/Caleffi","offers":[{"title":"Default Title","offer_id":53084630483280,"sku":"AL-309500CST","price":29.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0939\/2344\/3024\/files\/Altecnic-Caleffi-Pressure-Temperature-Relief-Valve-3-4-Inch-90DegC-10-Bar-309500CST.jpg?v=1780050611","url":"https:\/\/industrialvalveoutlet.com\/products\/altecnic-caleffi-309-series-pressure-temperature-relief-valve-3-4-90-deg-c-10-bar-309500cst","provider":"Industrial Valve Outlet","version":"1.0","type":"link"}