Page 392 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

Cold water accumulator

Pressure
reducing
valve
In-line
Pressure strainer
gauge
Isolation
In-line Double valve
strainer check valve

Non-return valve
Water undertaker's Non-return valve Cold supply to outlets
stop valve
Pressure reducing valve

p Figure 6.25 An accumulator installed on an unvented system

Accumulators require a minimum incoming supply pressure to replenish
successfully, usually around 2 bar. If the incoming supply cannot deliver this,
even at off-peak periods, then a booster pump should also be installed, as
shown in Figure 6.26.

Cold water accumulator

Pressure
reducing
valve
In-line
Pressure Non-return strainer
gauge valve Isolation
In-line Double valve
strainer check valve

Boosting pump
Non-return valve
Pressure reducing valve
Water undertaker's stop valve Balanced cold supply to outlets

p Figure 6.26 An accumulator with a boosting pump installed on an unvented system

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