Technical Instructions
Document No. 155-116A
June 14, 2012
VMP42 Two-Way and 3-Way Valves
Description
The VMP Two-way and Three-way Valves are designed to control water and glycol
solutions. By removing the cap from the bottom by-pass port (B), this valve assembly
is converted to a three-way valve.
Features
Stainless steel plug and stem
No tools are required to assemble the actuator to the valve.
Valve is shipped with a plastic cap which allows manual positioning to 80% of
stroke.
Application
The VMP is used in HVAC installations for the control of the water side of terminal
units such as induction units, fan coil units, and small reheat coils. It is suitable for use
in two-pipe or 3-pipe systems.
Product Numbers
Table 1.
Line Size
in Inches (mm)
Cv (Kvs)
Product Number
Max ΔP*
psig (kPa)
External Thread on
Valve Body
1/2 (15)
0.29 (0.25)
VMP42.09(2)
58 (400)
1/2" NPT
0.47 (0.4)
VMP42.10(2)
0.74 (0.63)
VMP42.11(2)
1.17 (1.0)
VMP42.12(2)
3/4 (20)
1.87 (1.6)
VMP42.13(2)
3/4" NPT
2.92 (2.5)
VMP42.14(2)
Product
Number
Pressure Differential psi
Cv1 2 4 6 8
10
15
20
25
30
40
50
VMP42.09(2)
0.29
0.41
0.58
0.71
0.82
0.92
1.12
1.30
1.45
1.59
1.83
2.05
VMP42.10(2)
0.47
0.66
0.94
1.15
1.33
1.49
1.82
2.10
2.35
2.57
2.97
3.32
VMP42.11(2)
0.74
1.05
1.48
1.81
2.09
2.34
2.87
3.31
3.70
4.05
4.68
5.23
VMP42.12(2)
1.17
1.65
2.34
2.87
3.31
3.70
4.53
5.23
5.85
6.41
7.40
8.27
VMP42.13(2)
1.87
2.64
3.74
4.58
5.29
5.91
7.24
8.36
9.35
10.24
11.83
13.22
VMP42.14(2)
2.93
4.14
5.86
7.18
8.29
9.27
11.35
13.10
14.65
16.05
18.53
20.72
* Max. ΔP = Maximum recommended differential pressure for modulating service.
Table 2. Maximum Water Capacity – U.S. Gallons per Minute.
Siemens Industry, Inc.
Technical Instructions VMP42 Two-Way and Three-Way Valves
Warning/Caution
Notations
WARNING:
Personal injury/loss of life may occur if a procedure is not
performed as specified.
CAUTION:
Equipment damage may occur if the user does not follow
procedure as specified.
Specifications
Valve Body
Body Style Globe, screwed
Line size/Capacity See Tables 1 and 2
Medium Water, glycol to 50%
Body Bronze
Trim Stainless Steel
Body rating ANSI Class 250 (PN 16)
Packing Double O-ring
Medium temperature 41°F to 230°F (5°C to 110°C)
Rangeability
1/2-inch 50:1
3/4-inch 100:1
Flow characteristics
Equal percentage A to AB
Linear B to AB
Leakage rate
A to AB 0.02% of CV
B to AB 0.2% of C
V
Maximum inlet pressure 232 psig (1600 kPa)
Maximum pressure differential for
modulating service 58 psig (400 kPa)
Dimensions See Figure 3.
Shipping weight
1/2" 1 lb (0.45 kg)
3/4" 1.2 lbs (0.55 kg)
Document Number 155-116A
June 14, 2012
Page 2 Siemens Industry, Inc.
VMP42 Two-Way and Three-Way Valves Technical Instructions
Applications
Two-port Valves
Arrow on valve indicates the direction of flow. Direction of flow is always from A to
AB.
Figure 1. Direction of Flow with Two-port Valves.
Three-port Valves
These valves must always be used as mixing valves. The arrow on the valve
indicates the direction of flow. Direction of flow is from A and B to AB.
Figure 2. Direction of Flow with Three-port Valves.
Installation
Valve assembly should be mounted in the return.
Match the direction of flow with the symbol cast on the valve body.
CAUTION:
Before start-up and troubleshooting the valve, ensure that the piping
system is free of dirt and foreign particles.
The lower the CV, the greater probability of valve performance
problems due to suspended solids in the piping system.
Strainer guidelines:
80 mesh for CV 0.47 and smaller
40 mesh for CV 0.63 and larger
Service
If inoperative, replace the unit.
Document Number 155-116A
June 14, 2012
Siemens Industry, Inc. Page 3
Technical Instructions VMP42 Two-Way and Three-Way Valves
USA
Document No. 155-116A
Printed in the USA
Page 4
Dimensions
Valve Size
A B C E F G SW
H
1/2 (15)
3-5/16
(84)
1-11/16
(42)
1-7/8
(47)
7/16
(11.5)
1/2"
NPT
1-11/16
(16)
15/16
(24)
1-3/8
(35)
3/4 (20)
4
(101) 2 (51)
2
(51)
11/16
(17)
3/4"
NPT
1-7/8
(48)
1-3/16
(30)
1-5/8
(41)
Document Number 155-116A
June 14, 2012
Figure 3. Dimensions in Inches (Millimeters).
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Products or company names mentioned herein may be the trademarks of their respective owners. © 2012
Siemens Industry, Inc.
Siemens Industry, Inc.
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