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2. SAFETY EQUIPMENT AND MAINTENANCE
for contractors cont...
2.2 System safety
Pressure temperature relief valve, PTR ( on-site provision )
This valve opens when the water pressure exceeds the preset value, thereby relieving the pressure.
It is adjusted so that no water will be expelled when heating is switched OFF. Should it continue to
drip excessively, either the valve seat has become contaminated, the water pressure is too high or
the pressure limiting valve has become faulty.
Pressure reduction valve, PRV ( on-site provision )*
Check the valve for correct operation and replace if necessary.
Regular valve maintenance
Safety requires that the valves are regularly checked. How quickly limescale builds up depends on
the local water quality. As your local contractor is familiar with your local water quality, let him/her
determine the timing of this check.
*A pressure limiting valve, PLV, cannot be used since it does not provide adequate pressure control as a PRV does
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