22
WATER SPECIALIST DISC VALVE PROGRAMMING AND SERVICE MANUAL
17. DRAIN LINE FLOW CONTROL AND FITTING ASSEMBLY
The drain line flow control assembly includes a drain line flow control and a fi tting. The drain line flow
control allows proper mediabed expansion by regulating the flow rate to the drain. The drain line flow
control is a flexible washer-like part with an orifi ce and a precision molded contour. The flow rates are
within ± 10% over the pressure range of 20 psi to 125 psi (1.4 bar to 8.6 bar). See table for flow rate
information.
Drain Line Flow Control and Fitting Assembly Information
Drain Line
Fitting
Drain Line Flow
Control Order No.
Number on Drain
Line Flow Control
Backwash Flow
Rate (gpm)
Backwash Flow
Rate (lpm)
3/4
"
V3162-007
007
0.7
2.6
3/4
"
V3162-010
010
1.0
3.8
3/4
"
V3162-013
013
1.3
4.9
3/4
"
V3162-017
017
1.7
6.4
3/4
"
V3162-022
022
2.2
8.3
3/4
"
V3162-027
027
2.7
10.2
3/4
"
V3162-032
032
3.2
12.1
3/4
"
V3162-042
042
4.2
15.9
3/4
"
V3162-053
053
5.3
20.1
3/4
"
V3162-065
065
6.5
24.6
3/4
"
V3162-075
075
7.5
28.4
3/4
"
V3162-090
090
9.0
34.1
3/4
"
V3162-100
100
10.0
37.9
1"
V3190-090
090
9.0
34.1
1"
V3190-100
100
10.0
37.9
1"
V3190-110
110
11
41.6
1"
V3190-130
130
13
49.2
1"
V3190-150
150
15
56.8
1"
V3190-170
170
17
64.3
1"
V3190-200
200
20
75.7
1"
V3190-250
250
25
94.6
The drain line flow control and fi tting are located on the side of the control valve and replaceable
without the use of special tools.
The drain line flow control can be installed in the standard 3/4
"
drain line elbow, which accommodates
5/8
"
polytube or 3/4
"
NPT drain line connections. The optional nut and polytube insert for the 3/4
"
drain line elbow is designed for use with fl exible polytube only. The 3/4
"
drain line elbow can be
rotated 180 degrees so the outlet can be orientated to the nearest drain. The same retainer is used
for all drain line flow controls for the 3/4
"
fi tting. Drain line flow controls designed for the 3/4
"
fitting
are available for flow rates ranging from 0.7 to 10 gpm (2.6 to 37.9 lpm).
An optional 1
"
straight drain line fitting is available to accommodate drain line flow rates ranging from
9 to 25 gpm (34.1 to 94.6 lpm). This fitting is straight but still connects to the control valve using the
same locking clip. The drain line flow control is located between two fitted parts (i.e. the fitting acts as
the retainer). The nut is unscrewed to access the drain line flow control.
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