Spirax Sarco DP17 - Page 17

IM-P100-05 CTLS Issue 17
17
Fig. 8 Setting procedure sequence DP17, DP17E, DP17G, DP17Y and DP27G
Fig. 9 Setting procedure sequence DP17R
4.2 Two or more valves in parallel
When more than one reducing valve is used it is an advantage to use two valves of unequal
size, the smaller one being chosen to meet the lower load requirements and the larger valve
to come into operation so that both meet the normal and maximum demand.
It is necessary to commission each valve independently (one at a time) following the
procedure detailed in Section 4.1 but setting the smaller valve at a pressure higher than
the larger valve.
] See Section 3.6, page 13
2
5
2, 9
2, 6
5
3, 7, 8
4
4
Condensate
return
Steam flow
Optional bypass line (see Section 3.10)
]
2
5
2, 9
32, 6
5
4
4
Condensate
return
Steam flow
Optional bypass line (see Section 3.10)
] See Section 3.6 page 13
]