Data Sheet
HP Valve
D101635X012
Product Bulletin
51.2:HP
October 2014
22
Table13.FlowingPressureDropLimitsforNPS6HPDandHPT Valves (Without Cavitrol III or Whisper Trim III
Cage)
FLOW
MEDIA
STEM
DIAMETER,
mm (INCHES)
MAXIMUM FLOWING
PRESSURE DROP
Bar PSI
Flow Down Flow Up Flow Down Flow Up
All except
boiler
feedwater
19 (3/4) 103 --- 1500 ---
25.4 (1) 172 --- 2500 ---
31.8 (1-1/4) 259 --- 3750 ---
51.8 x 31.8
(1)
(2 x 1-1/4)
259 259 3750 3750
Boiler
feedwater
31.8 (1-1/4) 69 --- 1000 ---
51.8 x 31.8
(1)
(2 x 1-1/4)
138 259 2000 3750
1. Requires 31.8 mm (1-1/4 inch) S20910 stem with 52.8 mm (2-inch) plug-to-stem connection.
Figure 12. Pressure-Temperatu re Limits for Trim Material Combinations
Notes:
Use trim 2 07B in NPS 3, 4, 6 HP and NPS 4, 6, 8 H PA above 343_C (650_F).
NACE MR01 75-2002.
Be especially careful to specify service temperature if trim 202 or 208 is selected,As different thermal expansionrates
require special plug clearances.
The limit for 2-stage NPS 1 and 2 valves is 2160 psig. For NPS 3 to 6 valves the limit is 1800 psig.
1
2
3
4
C0746-5
300
0
00
0
1000
2000
3000
5000
6000
10
4000
1200
0 200 400 600
200
400
300
200
100
800400-40
FLUID TEMPERATURE, _F
FLUID TEMPERATURE,
_C
PRESSURE DROP, PSI
600 1000
PRESSURE DROP, BAR, DIFFERENTIAL
6000
0
1000
2000
3000
5000
10
4000
1200
0 200 400 600
200
400
200
100
800400-40
FLUID TEMPERATURE, _F
FLUID TEMPERATURE,
_C
SOUR SERVICE APPLICATIONS (NACE)
PRESSURE DROP, PSI
600 1000
0
1000
2000
3000
5000
6000
10
4000
1200
200 400 600
200
400
300
200
100
800400
-100
FLUID TEMPERATURE, _F
FLUID TEMPERATURE,
_C
PRESSURE DROP, PSI
600 1000
0
1000
2000
3000
5000
6000
10
4000
1200
200 400 600
200
400
300
200
100
800400-20
FLUID TEMPERATURE, _F
FLUID TEMPERATURE,
_C
PRESSURE DROP, PSI
600 1000
0
1000
2000
3000
5000
6000
10
4000
1200
200 400 600
200
400
300
200
100
800400-20
FLUID TEMPERATURE, _F
FLUID TEMPERATURE,
_C
PRESSURE DROP, PSI
600 1000
-29
PRESSURE DROP, BAR, DIFFERENTIAL
PRESSURE DROP, BAR, DIFFERENTIAL
PRESSURE DROP, BAR, DIFFERENTIAL
PRESSURE DROP, BAR, DIFFERENTIAL
-29
1
-40
-40
-73
2
650
3
202,208
202H,
208H
201, 207
210
LIMIT FOR
3-STAGE
LIMIT FOR
2-STAGE
204,
209
206
206
215
4
203
211
212