Operation - Siemens 599-02015 Technical Instructions

Technical Instructions
Document Number 155-196P25
April 9, 2009
A
2W NC
2W NO
B

Operation

Sizing
Page 8
2W, NC, SQS...
100 690
90 621
95
80 552
(655)
70 483
60 414
50 345
50
40 276
(345)
40
30 207
(276)
20 138
10 69
0 0
1/2", 1/2", 3/4" and 1"
Cv>0.4 Cv>2.5
Cv <1.6 Cv <4
Line Size (in)
2W, NO, SQS...
180 1241
160 1103
160
140 966
(1103)
120 828
100 690
80 552
85
60 70 414
(586)
(483)
40 276
20 138
0 0
1/2", 1/2", 3/4" and 1"
Cv>0.4 Cv>2.5
Cv <1.6 Cv <4
Line Size (in)
SQS...
Figure 2. Close-off Pressures.
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.
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
2W, NC, SSC...
100 690
90 621
95
80 552
(655)
70 483
60 414
50 345
50
40 276
(345)
40
30 207
(276)
20 138
10 69
0 0
1/2", 1/2", 3/4" and 1"
Cv>0.4 Cv>2.5
Cv <1.6 Cv <4
Line Size (in)
2W, NO, SSC...
140 996
120 828
120
100 690
(828)
80 552
60 414
65
55
(448)
40 276
(379)
20 138
0 0
1/2", 1/2", 3/4" and 1"
Cv>0.4 Cv>2.5
Cv <1.6 Cv <4
Line Size (in)
SSC...
NORMALLY OPEN
Figure 3.
2W, NC, 10 - 15 psi
100 690
90 621
95
80 (655) 552
70 483
60 414
50 345
50
40
276
(345)
40
30
207
(276)
20
138
10 69
0 0
1/2", 1/2", 3/4" and 1"
Cv <1.6 Cv <4
Cv<10
Line Size (in)
2W, NO, 3 - 8 psi
100 690
90 95 621
(655)
80 552
70 483
60 414
50 345
40 45 276
(310)
30 35 207
(241)
20 138
10 69
0 0
1/2", 1/2", 3/4" and 1"
Cv <1.6 Cv <4 Cv<10
Line Size (in)
2-in Pneumatic
NORMALLY CLOSED
Siemens Building Technologies, Inc.