12
Pressure
relief
valve
Note: If pressure reducing valve is
used expansion down the mains is not possible
Expansion
vessel
Hot
Cold
Nearest cold
draw off
Service valve
(fixed jumper or
1/4 turn ball type)
Cold
water
mains
Tundish
To drain (waste)
For expansion in pipwork:
2.8m of pipework is required for the 10 litre model
or 4.2m of pipwork for the 15 litre model.
For inlet pressure up to 0.41 MPa (4.1 bar)
Hot
Cold
Check
valve
Nearest cold
draw off
Service valve
Cold
water
mains
Tundish
To drain (waste)
For inlet pressure up to 0.41 MPa (4.1 bar) where expansion
in mains supply is not possible
Expansion
vessel
Hot
Cold
Check
valve
Nearest cold
draw off
Service valve
Pressure
reducing
valve
Cold
water
mains
Tundish
To drain (waste)
For inlet pressure above 0.41 MPa (4.1 bar)
Pressure
relief
valve
Pressure
relief
valve