Setting the Rate of Flow Control Valves
STEP 1
Pre-set pilots as noted:
Rate of Flow
– Adjust OUT, counterclockwise, to start valve at a lower flow rate.
Pressure Reducing
– Adjust OUT, counterclockwise, backing pressure off the spring, preventing possible over-pressuring of the system.
Opening and Closing Speed
– Turn the adjustment screws on the Closing Speed and Opening Speed Controls, if the main valve is so
equipped, OUT, counterclockwise, 1½ to 2½ turns from full closed position.
STEP 2
To ensure proper operation, any trapped air will need to be bled
off the valve cover during startup. The ACV includes a bleed valve,
use a flat head screwdriver to slowly open the valve (See Figure 1).
STEP 3
Pressure the line, by opening the upstream isolation valve slowly.
Air is vented through the air bleed valve. Tighten the fitting when
liquid begins to vent (See Figure 1).
Repeat the process until no air is trapped in the system.
STEP 4
Slowly open downstream isolation valve to establish flow through
the system.
STEP 5
With a demand for flow on the system, the valve can now be
adjusted for the proper flow rate. This requires a meter to read the
flow that the valve is providing.
Globe
Angle
Size (in)
1
1/4
1
1/2
2
21/2
3
4
6
8
10
12
14
16
20
24
A (in)
16
16
20
22
22
24
32
34
38
44
48
52
56
56
B (in)
10
10
12
14
14
16
24
26
28
30
34
40
48
48
Size (in)
1
1/4
1
1/2
2
2
1/2
3
4
6
8
10
12
14
16
C (in)
16
16
20
22
22
24
32
34
38
44
48
52
D (in)
10
10
12
14
14
16
24
26
28
30
34
40
Counterclockwise to OPEN
bleed valve
The following tables detail the recommended minimum valve servicing dimensions.
A
B
C
FLOW
FLOW
FLOW
D
FLOW
Valve Servicing Dimensions
Figure 1
Position Indicator
IOM-ACV-114-2_6114-2 2115
EDP# 1917073
© 2021 Watts 3
