Spirax Sarco DP27, Installation And Maintenance Instructions Manual

Page: 10 / 40

IM-P470-03 CH Issue 7
10
Note: Before actioning any maintenance programme for the pilot
operated pressure reducing valve (PRV) observe the 'Safety information'
in Section 1.
Referring to these Installation and Maintenance Instructions, name-plate and
Technical Information Sheet, check that the product is suitable for the intended
installation.
3.1 Supply
DP27
(Figure 1)
These are supplied ready for fitting and have a variable rate conical pressure spring suitable
for a downstream pressure of 0.2 - 17 bar.
DP27Y
(Figure 1)
The DP27Y is supplied as the DP27, but has a lower rate pressure adjustment spring for a
downstream pressure range of 0.2 - 3 bar.
Pressure adjustment spring
Downstream internal
pressure balance pipe
Pressure setting adjustment screw
Lock-nut
Recommended downstream pressure
balance pipe connection
(refer to Section 3.8, page 14)
Fig. 1
DP27 and DP27Y
3. Installation