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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
R-155
V46 Series Valve Sizing Information—90% Open Method
Code No. LIT-1927400
To Select Water Valve Size:
See the Flow Chart for selection of water valves.
Carefully follow the steps as outlined below.
1 Determine maximum water flow required. The
manufacturer of the condensing unit will usually
provide tables, or calculations can be made from
the following:
a Maximum Btu per hour to be removed. (Be sure
to add heat gains in refrigeration equipment
and heat of compression. If figures are not
available, it is customary to add 25% to the load
for these heat gains.)
b Incoming water temperature at time of
maximum load.
c Outlet water temperature; this must be lower
than condensing temperature of the refrigerant
- use condensing unit manufacturer’s data, or
assume 10° difference.
d Flow (gallons/min) =
2 Draw horizontal line across upper half of flow chart
through flow required as determined by Step 1d
above.
3 Determine the available system pressure for use
with the valve by the following appropriate
method:
Open System:
Available System Pressure = Inlet Pressure -
condenser pressure drop - friction losses in piping.
Closed System:
Available System Pressure = Inlet Pressure -
static head - condenser pressure drop - friction
losses in piping.
The available system pressure is represented by
the curve in the lower half of the flow chart.
4 Draw a horizontal line from 55 psi head pressure
rise above opening point (valve approximately
90% open) to the available system pressure. If the
point falls between two curves, use the curve to
the left (this gives an automatic safety factor).
5 From the point where the horizontal line intersects
the available system pressure curve, draw a
vertical line upwards until it intersects with the
horizontal line from Step 2.
6 If the intersection falls on a valve size curve, this is
the valve size.
7 If the intersection falls between two curves, use
the curve to the left for the required valve size.
     
      
Example:
1 The required flow of an R404A system is found to be 40 GPM (151 l/m).
City water pressure is 40 psig (276 kPa) and manufacturer’s table gives drop
through condenser and accompanying piping and valves at 15 psi (103 kPa)
drop through installed piping approximately 5 psi (35 kPa), leaving a net
pressure drop available of 20 psi.
2 Draw a line through 40 GPM (151 l/m) - see dotted line, upper half of flow chart.
3 Size valves at 55 psi head pressure rise above opening point (valve is
approximately 90% open).
4 Draw a line through 55 psi (375 kPa) - see dotted line, lower half of flow chart.
5 Available water pressure drop through valve
= 40 - 20 = 20 psi (276 - 137 = 137 kPa).
6 Draw vertical line upward from this point to flow line - circle on flow chart marks
this intersection.
7 Since the intersection falls between curves for 1 in. and 1-1/4 in. valves,
choose the larger size. A 1-1/4 in. valve is required.
60 414
300 1136
200
100
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
1
2
757
379
341
303
256
227
189
151
114
76
38
34
30
26
23
19
15
11
7
3.8
50 345
40 276
30 207
20 138
10 69
0 0
Water Flow In Gallons/Minute
W
ater Flow In Liters/Minute
Refrig. Head Press. Above Opening PT. (PSI)
Refrig. Head Press. Above Opening PT. (kPa)
flowch1
Water Pressure Drop Through Valve PSI (kPa)
1/2
3/4
3/8
1
2
1-1/4
2-1/2
1-1/2
Flow Chart
Valve Size
3/8 in. thru 1-1/2 in.
2 in., 2-1/2 in.
Refrigerant
All-range R-12, R-500, R-22, R-502,
Ammonia, R-12, R-500
2
(14)
5
(34)
10
(69)
20
(138)
30
(207)
40
(276)
50
(345)
6
(414)
Flow Chart, V46 Valve
v46size.eps
Valves and Valve Accessories