Powermite 599 Series
Technical Instructions
Document No. 155-196P25
VF 599-5
February 2, 2023
MT Series Terminal Unit
Two-way Valves
Siemens Industry, Inc.
Description
The Powermite 599 Series ANSI Class 250 MT Series two-way valve bodies work with
any MT Series pneumatic or electronic actuator with a 7/32-inch (5.5 mm) stroke.
Features
• Direct coupled universal bonnet
• Choice of brass or stainless steel trim
• ANSI Leakage Class IV (0.01% of Cv)
Application
A typical application for the Powermite two-way valve is the control of hot or chilled
water or low pressure (<15 psi with stainless steel trim only) steam for convectors, fan
coil units, unit conditioners, radiation, reheat coils, and similar terminal units requiring
an actuator that delivers a minimum of 67 pounds force (300 N).
Product Numbers
See Table 2.
Ordering a Valve
Plus Actuator
Assembly
To order a complete valve plus actuator assembly from the factory, combine the
actuator prefix code with the suffix of the valve assembly product number. See
Technical Bulletin TB251 (155-306P25) for selection procedure and ordering codes.
Valve assemblies can be ordered using the numbers in Table 2.
Specifications
Valve size 1/2 inch to 1 inch (15 mm to 25 mm)
Capacity See Tables 3 through 6 and Figure 1
Body style Globe
Seat style Metal-to-metal
Action Normally open/normally closed
Valve body rating ANSI Class 250; See Table 1.
Stem travel (Stroke) 7/32-inch (5.5 mm)
Technical Instructions Powermite 599 MT Series Terminal Unit 2-way Valves
Document Number 155-196P25
February 2, 2023
Page 2 Siemens Industry, Inc.
Specifications
Material
Body
1/2- and 3/4-inch C37700 Forged brass
1-inch UNS CA 844 Bronze
Body trim See Table 2.
Stem Stainless steel ASTM A582 Type 303
Packing Ethylene propylene O-ring
Operating
Spring Range
Normally closed 10 to 15 psi (69 to 102 kPa)
Normally open 3 to 8 psi (21 to 55 kPa)
Controlled medium Water, low pressure steam
(<15psi with stainless steel trim only),
water-glycol solutions to 50%
Medium temperature range 35°F to 250°F (2°C to 120°C)
Maximum inlet pressure See Table 1.
Maximum recommended differential pressure for modulating service
Brass Trim
Stainless Steel Trim
Liquid
25 psi (173 kPa)
50 psi (345 kPa)
Steam
—
15 psi (103 kPa)
Rangeability Cv <1 >50:1
Cv >1 >100:1
Close-off pressures See Table 7, Table 8, and Figure 2
Close-off ratings According to ANSI/FCI 70-2
Leakage rate Class IV (0.01% of Cv)
Flow characteristics Modified equal percentage
Miscellaneous
Canadian Registration Numbers 0H7645.5
0C0838.9
Mounting location NEMA 1 (interior only)
Dimensions See Table 9, Table 10, and Figure 4
Valve Weight See Table 10.
Service Kit
Sealing rings for union valves (package of 25)
1/2-inch (15 mm) 698-088
3/4-inch (20 mm) 599-03394
Union connection kit
1/2-inch (15 mm) 599-02941
3/4-inch (20 mm) 599-02942
Protective black knob
to cover the bonnet
and threads/manual
override.
426888950
Powermite 599 MT Series Terminal Unit 2-way Valves Technical Instructions
Document Number 155-196P25
February 2, 2023
Siemens Industry, Inc. Page 3
Table 1. Body Temperature-Pressure Rating.
Valve Body
Temperature
Pressure
°F
°C
psig
(kPa)
Bronze/
Forged Brass
-20 to 150
(-30 to 66)
400
(2758)
200
(93)
385
(2655)
250
(121)
365
(2586)
300
(149)
335
(2300)
350
(177)
300
(2068)
Internal Thread NPT ×
Internal Thread NPT
ITxIT
Internal Thread NPT ×
Union External Thread
ITxUET
Angle Internal Thread ×
Union External Thread
AITxUET
Table 2. Product Part Numbers.
Action
Flow Rate
Nominal Valve
Size
Trim and Connection
Cv
(Kvs)
Inches
(mm)
Stainless Steel
Brass
ITxIT
ITxUET
AF×UM
ITxIT
ITxUET
AITxUET
Normally Closed
0.4
(0.34)
1/2
(15)
599-02015
599-02016
—
599-02000
599-02001
—
0.63
(0.54)
1/2
(15)
599-02017
599-02018
—
599-02002
599-02003
—
1.0
(0.85)
1/2
(15)
599-02019
599-02020
—
599-02004
599-02005
—
1.6
(1.37)
1/2
(15)
599-02021
599-02022
—
599-02006
599-02007
—
2.5
(2.15)
1/2
(15)
599-02023
599-02024
—
599-02008
599-02009
—
4.0
(3.44)
1/2
(15)
599-02025
599-02026
—
599-02010
599-02011
—
6.3
(5.43)
3/4
(20)
599-02027
599-02028
—
599-02012
599-02013
—
10
(8.6) 1 (25)
599-02029
—
—
599-02014
—
—
Normally Open
0.4
(0.34)
1/2
(15)
599-02047
599-02048
—
599-02030
599-02031
—
0.63
(0.54)
1/2
(15)
599-02049
599-02050
—
599-02032
599-02033
—
1.0
(0.85)
1/2
(15)
599-02051
599-02052
—
599-02034
599-02035
—
1.6
(1.37)
1/2
(15)
599-02053
599-02054
—
599-02036
599-02037
—
2.5
(2.15)
1/2
(15)
599-02055
599-02056
599-02057
599-02038
599-02039
599-02040
4.0
(3.44)
1/2
(15)
599-02058
599-02059
599-02060
599-02041
599-02042
599-02043
6.3
(5.43)
3/4
(20)
599-02061
599-02062
—
599-02044
599-02045
—
10
(8.6) 1 (25)
599-02063
—
—
599-02046
—
—
Technical Instructions Powermite 599 MT Series Terminal Unit 2-way Valves
Document Number 155-196P25
February 2, 2023
Page 4 Siemens Industry, Inc.
Table 3. Maximum Water Capacity - U.S. Gallons per Minute.
Valve
Size
Inches
Pressure Differential - psi
Cv\1 2 3 4 5 6 8
10
15
20
25
30
40
50
60
75
1/2
0.4
0.6
0.7
0.8
0.9
1.0
1.1
1.3
1.5
1.8
2.0
2.2
2.5
2.8
3.1
3.5
0.63
0.9
1.1
1.3
1.4
1.5
1.8
2.0
2.4
2.8
3.2
3.5
4.0
4.5
4.9
5.5
1.0
1.4
1.7
2.0
2.2
2.5
2.8
3.2
3.9
4.5
5.0
5.5
6.3
7.1
7.8
8.7
1.6
2.3
2.8
3.2
3.6
3.9
4.5
5.1
6.2
7.2
8.0
8.8
10.1
11.3
12.4
13.9
2.5
3.5
4.3
5.0
5.6
6.1
7.1
7.9
9.7
11.2
12.5
13.7
15.8
17.7
19.4
22
4
5.7 7 8.0
8.9
10
11.3
12.6
15.5
17.9
20.0
21.9
25
28
31
35
3/4
6.3
8.9
10.9
12.6
14.1
15.4
17.8
20
24
28
32
35
40
45
49
55 1 10
14.1
17.3
20
22
24
28
32
39
45
50
55
63
71
77
87
Table 4. Maximum Water Capacity - Cubic Meters per Hour (m3/hr).
Valve Size
Pressure Differential - kPa
mm
1
10
20
30
40
50
60
80
Kvs/
100
150
200
300
400
500
15
0.03
0.11
0.15
0.19
0.22
0.24
0.26
0.30
0.34
0.42
0.48
0.59
0.68
0.76
0.05
0.17
0.24
0.30
0.34
0.38
0.42
0.48
0.54
0.66
0.76
0.94
1.08
1.21
0.09
0.27
0.38
0.47
0.54
0.60
0.66
0.76
0.85
1.0
1.2
1.5
1.7
1.9
0.14
0.43
0.61
0.75
0.87
0.97
1.06
1.23
1.37
1.7
1.9
2.4
2.7
3.1
0.21
0.68
0.96
1.17
1.35
1.51
1.66
1.91
2.15
2.6
3.0
3.7
4.3
4.8
0.34
1.1
1.5
1.9
2.2
2.4
2.7
3.1
3.4
4.2
4.9
6.0
6.9
7.7
20
0.54
1.7
2.4
3.0
3.4
3.8
4.2
4.9
5.4
6.7
7.7
9.4
10.9
12.1
25
0.86
2.7
3.8
4.7
5.4
6.1
6.7
7.7
8.6
10.5
12.2
14.9
17.2
19.2
32
1.4
4.4
6.2
7.6
8.7
9.8
10.7
12.3
13.8
16.9
19.5
23.9
27.6
30.9
40
2.2
6.8
9.6
11.8
13.6
15.2
16.7
19.2
22
26
30
37
43
48
Powermite 599 MT Series Terminal Unit 2-way Valves Technical Instructions
Document Number 155-196P25
February 2, 2023
Siemens Industry, Inc. Page 5
Table 5. Maximum Steam Capacity - Pounds per Hour.
Valve
Size
Inches
Inlet Pressure - psig
2
5
10
15
Pressure Differential - psi
Cv/1 1 2 1 2 3 4 5 2 4 6 8 10 6 9
12
15
1/2
0.4
4.8
6.7
5.2
7.3
8.8
10.0
11.0
8.2
11.3
13.6
15.3
16.7
15.0
17.9
20.0
21.6
0.63
7.5
10.5
8.2
11.4
13.8
15.7
17.4
12.9
17.8
21.3
24.1
26
23.7
28.2
32
34
1.0
12.0
16.6
13.0
18.2
22
25
28
20
28
34
38
42
38
45
50
54
1.6
19.1
27
21
29
35
40
44
33
45
54
61
67
60
72
80
86
2.5
30
42
33
45
55
62
69
51
71
85
96
104
94
112
125
135
4
48
67
52
73
88
100
110
82
113
136
153
167
150
179
200
216
3/4
6.3
75
105
82
114
138
157
174
129
178
213
241
263
237
282
316
341 1 10
120
166
130
182
219
250
275
204
283
339
382
417
376
447
501
541
Table 6. Steam Capacity - Kilograms per Hour.
Valve
Size
mm
Inlet Pressure - kPa
50
100
Pressure Differential – kPa
Kvs
10
25
10
20
50
15
0.34
1.7
2.7
2.4
3.4
5.4
0.54
2.7
4.3
3.8
5.4
8.5
0.85
4.3
6.8 6 8.5
14
1.37
6.9
10.8
10
14
22
2.15
10.7
17
15
21
34
3.4
17
27
24
34
54
20
5.4
27
43
38
54
85
25
8.6
43
68
60
85
135
Technical Instructions Powermite 599 MT Series Terminal Unit 2-way Valves
Document Number 155-196P25
February 2, 2023
Page 6 Siemens Industry, Inc.
Figure 1. Water Capacity Graph.
Selection Example
See Figure 1.
Select a valve given:
Required flow = 20 gpm.
Desired pressure drop = 5 psi.
Choose a 1-inch (25-mm) valve, Cv 10.
Powermite 599 MT Series Terminal Unit 2-way Valves Technical Instructions
Document Number 155-196P25
February 2, 2023
Siemens Industry, Inc. Page 7
Table 7. Close-off Pressures for Electronic Actuators.
Action
Valve Size
Inches (mm)
SAS
psi (kPa)
SSC
psi (kPa)
NC
1/2
0.4< Cv <1.6
95 (655)
95 (655)
(15)
(0.34< Kvs <1.37)
1/2
2.5< Cv <4
50 (345)
50 (345)
(15)
(2.15< Kvs <3.44)
3/4 (20)
40 (276)
40 (276)
1 (25)
NO
1/2
0.4< Cv <1.6
160 (1103)
120 (828)
(15)
(0.34< Kvs <1.37)
1/2
2.5< Cv <4
85 (586)
65 (448)
(15)
(2.15< Kvs <3.44)
3/4 (20)
70 (482)
55 (379)
1 (25)
Table 8. Maximum Available Close-off Pressures for Pneumatic Actuators.
Action
Valve Size
Inches (mm)
2-inch Actuator
@ 0 psi (0 kPa)
(with 10 to 15 psi
Valve)
NC
1/2
0.4< Cv <1.6
95 (655)
(15)
(0.34< Kvs <1.37)
1/2
2.5< Cv <4
50 (345)
(15)
(2.15< Kvs <3.44)
3/4 (20
40 (276)
1 (25)
@ 20 psi (103 kPa)
(with 3 to 8 psi
Valve)
NO
1/2
0.4< Cv <1.6
95 (655)
(15)
(0.34< Kvs <1.37)
1/2
2.5< Cv <4
45 (310)
(15)
(2.15< Kvs <3.44)
3/4 (20)
35 (241)
1 (25)
Technical Instructions Powermite 599 MT Series Terminal Unit 2-way Valves
Document Number 155-196P25
February 2, 2023
Page 8 Siemens Industry, Inc.
Figure 2. Close-off Pressures.
Operation
Figure 3 shows the normally open valve in the open or full flow position and the
normally closed valve in the closed or zero flow position. The valve spring provides the
necessary force to hold the stem in the raised or normal position.
In the event of power failure, a spring return actuator returns the valve to its normal
position. Non-spring return actuators will hold the last commanded position. See the
Technical Instructions of the various actuators for additional information.
Figure 3.
Sizing
The sizing of a valve is important for correct system operation. An undersized valve will
not have sufficient capacity at maximum load. An oversized valve can initiate cycling,
and the seat and throttling plug can be damaged because of the restricted opening.
Correct sizing of the control valve for actual expected conditions is considered essential
for good control.
See Tables 3 through 6 for valve capacities.
Powermite 599 MT Series Terminal Unit 2-way Valves Technical Instructions
Document Number 155-196P25
February 2, 2023
Siemens Industry, Inc. Page 9
Sizing, continued
The following variables must be determined:
• The medium to be controlled: water, etc.
• The maximum inlet temperature and pressure of the medium at the valve.
• The pressure differential that will exist across the valve under maximum load
demand.
• The maximum capacity the valve must deliver.
• The maximum line pressure differential the valve actuator must close against.
See Application Bulletin (AB)-1 Control Valve Selection and Sizing (155-285) for further
recommendations.
Mounting and
Installation
Install the valve so that the flow follows the direction of the arrow indicated on the valve
body.
For best performance, install the valve assembly with the actuator above the valve body.
The valve and actuator can be installed in any position between vertical and horizontal. It is
not recommended to install the valve assembly so that the actuator is below horizontal or
upside-down.
Allow sufficient space for servicing the valve and actuator. See Table 11 for valve body
dimensions. See Figure 4 and Table 10 for dimensions of the service envelope
recommended around the actuator.
NOTE: Instructions for field mounting an actuator, wiring diagrams, and start-up are
covered in the Technical Instructions and Installation Instructions for each
actuator.
Service
Replace the valve if inoperable.
Disposal
Do not dispose of the valve as household waste.
• Special handling of individual components may be mandated by law or make
ecological sense.
• Observe all local and currently applicable laws and regulations.
The actuators are considered electrical and electronic equipment for
disposal in terms of the applicable European Directive and may not be
disposed of as domestic garbage.
• Dispose of the actuators through channels provided for this
purpose.
• Comply with all local and currently applicable laws and regulations.
Technical Instructions Powermite 599 MT Series Terminal Unit 2-way Valves
Document Number 155-196P25
February 2, 2023
Page 10 Siemens Industry, Inc.
Dimensions
The letters in Figure 4 refer to the valve centerline to top of actuator, the width of the
actuator, and service envelope dimensions in Table 10. See Table 11 for valve body
dimensions.
Figure 4.
Table 9. Actuator Dimensions and Recommended Service Envelope. Dimensions in Inches (Millimeters).
Actuator
Actuator
Prefix
Code
Valve
Size
Center Line to Top of
Actuator, H1
Service Height, H
Width or
Diameter of
Actuator, W1
Service
Width
W
599-01088
2-Inch
Pneumatic
256
257
258
1/2 (15)
3-1/16 (78)
11 (280)
4 (100)
10 (250)
3/4 (20)
3-1/16 (78)
11 (280)
4 (100)
10 (250)
1 (25)
3-5/16 (84)
11-1/4 (285)
4 (100)
10 (250)
SAS
NSR
363
364
1/2 (15)
7-1/2 (191)
15-1/2 (394)
3-1/2 (89)
7-1/2 (191)
3/4 (20)
7-1/2 (191)
15-1/2 (394)
3-1/2 (89)
7-1/2 (191)
1 (25)
7-3/4 (197)
15-3/4 (400)
3-1/2 (89)
7-1/2 (191)
SAS
SR
365
366
1/2 (15)
7-1/2 (191)
15-1/2 (394)
4 (100)
8 (203)
3/4 (20)
7-1/2 (191)
15-1/2 (394)
4 (100)
8 (203)
1 (25)
7-3/4 (197)
15-3/4 (400)
4 (100)
8 (203)
SSC81U
SSC81.5U
SSC61.5U
259
260
262
1/2 (15)
5-1/2 (140)
13-1/2 (343)
5-1/2 (140)
13-1/2 (343)
3/4 (20)
5-1/2 (140)
13-1/2 (343)
5-1/2 (140)
13-1/2 (343)
1 (25)
5-3/4 (146)
13-3/4 (349)
5-1/2 (140)
13-1/2 (343)
SSC161.05U
261
1/2 (15)
5 (127)
13 (330)
5-1/4 (133)
13-1/4 (337)
3/4 (20)
5 (127)
13 (330)
5-1/4 (133)
13-1/4 (337)
1 (25)
5-1/4 (133)
13-1/4 (337)
5-1/4 (133)
13-1/4 (337)
Powermite 599 MT Series Terminal Unit 2-way Valves Technical Instructions
Document Number 155-196P25
February 2, 2023
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. Product or company names mentioned herein may be the trademarks of their respective owners.
© 2020-2023 Siemens Industry, Inc.
Siemens Industry, Inc.
Smart Infrastructure
1000 Deerfield Parkway
Buffalo Grove, IL 60089
USA
+ 1 847-215-1000
Your feedback is important to us. If you have
comments about this document, please send them
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Document No. 155-196P25
Printed in the USA
Page 11
Internal Thread NPT ×
Internal Thread NPT
IT×IT
Internal Thread NPT ×
Union External Thread
IT×UET
Angle Internal Thread ×
Union External Thread
AIT×UMET
Table 10. 2-way Valve Dimensions.
Valve
Size
inches
A B C D E
Weight
lb (kg)
IT×IT
&
IT×UET
AIT×UMET
IT×IT
IT×UET
AIT×UMET
1/2
(15)
1-3/8
(35)
2-1/4
(57)
2-15/16
(74)
NO Only
1-5/16
(33)
2-5/8
(67)
1-1/2
(38)
NO only
0.96
(0.44)
1.14
(0.5)
1.4
(0.6)
3/4
(20)
1-5/8
(41)
2-3/8
(59)
—
1-5/16
(33)
3-1/8
(79)
—
1.13
(0.51)
1.45
(0.66)
—
1
(25)
1-15/16
(49)
2-3/4
(69)
—
1-9/16
(39)
—
—
1.7
(0.77)
—
—
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