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Paragraph 22

(1)

Every expansion valve, temperature relief valve or combined temperature and pressure relief valve connected to any fitting or appliance shall close automatically after a discharge of water.

(2)

Every expansion valve shall–

(a)

be fitted on the supply pipe close to the hot water vessel and without any intervening valves; and

(b)

only discharge water when subjected to a water pressure of not less than 0.5 bar (50 kPa) above the pressure to which the hot water vessel is, or is likely to be, subjected in normal operation.