16
4. Commissioning
DP27, DP27E and DP27Y (Figure 8)
2. Close all valves at reducing valve station,
including valves on bypass line if fitted.
3. Check that adjustment screw is turned
fully anticlockwise until spring is slack.
DP27R (Figure 9)
2. Close all valves at reducing valve station,
including the valve on the bypass line, if
fitted.
3. Check that the actuating air supply is off
and the pressure is zero.
4. Check that the pressure gauge isolating cocks are open.
5. For correct operation of the valve it is important that the pilot and main valves are not
subjected to dirt or other hard particles. Therefore, prior to bringing the valve into operation,
ensure that the upstream pipework has been cleared of all loose dirt and hard particles
and that the main strainer screen is examined and cleaned if necessary.
6. Slowly open the upstream isolating valve until it is fully open.
DP27, DP27E and DP27Y
7. Using a 19 mm A/F spanner slowly turn
adjustment screw in a clockwise direction
until desired downstream pressure
reading is obtained.
8. Holding the adjustment screw in position
with the spanner tighten down the lock-nut
to secure the setting of the adjustment
spring.
DP27R
7. Slowly admit actuating air through the
pressure regulator until the desired
downstream pressure is obtained.
Note
To facilitate resetting of the reducing valve it
may be desirable to position the downstream
pressure gauge at a viewpoint close to the air
regulator.
If this necessitates fitting the pressure gauge
below the steam line, the interconnecting pipe
should be drained at the low point otherwise
the gauge will give a false reading.
9. Slowly open the downstream valve until it is fully open.
Note: After installation or maintenance ensure that thet system is fully functional. Carry out
tests on any alarms or protective devices. It is recommended that after commissioning the
pilot filter is changed and the spare one supplied with the valve is fitted.
4.1 Setting procedure (Figure 8 and Figure 9)
1. Ensure that all connections are properly made and that all valves are closed.
To Next Page
Loading...
Need help?
General
