Setting the Low Pressure
Control
STEP 7
Close test valve 7A (See Figure 3) and use test valve 7B to reduce
gauge pressure to the desired low pressure tip point. (typically
10-20 PSI below static line pressure).
Clockwise to CLOSE
Test Valve
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
STEP 8
Slowly turn the 263 Low Pressure Control (See Figure 4) adjust-
ment screw IN, clockwise, until the main valve starts to open. This
setting can be confirmed by opening the test valve 7A, which will
raise the gauge pressure, then slowly lowering the gauge pressure
using test valve 7B until the main valve starts to open. When the
low pressure control is finally set, ensure that test valve 7A is left
fully open.
STEP 9
Once the approximate time for the pressure wave to return has
been calculated, the main valve can be cycled using test valves
and the opening speed adjusted such that the main valve will be
open before the wave arrives. The closing speed control (See
Figure 5) should be adjusted so that the main valve will not com-
mence closing until after the wave has passed. Closing speed
should not be so rapid that main valve closure itself creates sig-
nificant line shock.
Figure 5
Flow Control
4 IOM-ACV-116-52_6116-52 2115
EDP# 1917053
© 2021 Watts
IOM-ACV-116-52_6116-52 2115
EDP# 1917053
© 2021 Watts 5
Figure 3
Test Cock
Counterclockwise to CLOSE
main valve
Clockwise to OPEN
main valve
Figure 4
263RS - Low Pressure Control
7A
7B
