MISOL 3/4" DN20 Brass T&P Valve, temperature pressure relief valve 3/4" DN20 (BSP) Brass TP Valve Standard setting of pressure: 0.7 Mpa Temperature relief: 99 Cel. Degree ( 210 F. Degree) Application: It is used for bearing the pressing type of solar water heater, gas heater, electric heater, water heater of fuel, water heater of heat pump, sensitive function heater, etc. various kind of heaters (such as boiler) and hot water containers. Function: The TP relief valve controls and limits the temperature and pressure of the hot water contained in a solar domestic water storage heater and prevents it from being able to reach temperatures of over 99 Cel.degree, 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 operating limits.