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Another name for a safety valve is a TP valve.
A safety valve is is a safe guard for a water tank.
A safety valve is the last line of defense on a geyser.
When it releases the pressure, it causes the temperature in the geyser to increase.
Pressure : The spring above the valve is preset to discharge water above 1.5 times the rated pressure of the geyser.
A thermostat regulates the temperature of a geyser.
When components do not function the way they are supposed to in a geyser, the safety valve serves as the defense to prevent damage in that area.
A TP valve is one of the most valuable components in the geyser.
Geysers are pressure vessels.
Plumbers need to comply with SANS 10254 and use components that are compliant with SANS 151.