Technical Support Terminology

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1.
 Nominal ressure: the maximum rated pressure permissive for fluid of oil below 120℃ or water flow with fluctuating load to withstand without any leak or other malfunction at each position.
For example: 125S 600W.O.G. (C.W.P)
Description: 125 stands for a nominal pressure, 600W.O.G means the valve seat shall not access leak phenomenon when received a pressure of 600psi (42kgf/cm2) for operation of water, oil and gas flow at normal temperature.
2.
 W.O.G Water, Oil and Gas.
3.
 C.W.P Cold, Working, Pressure; the operating temperature under normal temperature (-28.9°C ~ 65.6°C)
4.
 S.W.P Steam, Working, Pressure
5.
 Pressure unit:
 Kgf/cm2，PSI(1b/in2)。For instance:1Kgf/cm2=14.2233PSI 125PSI=8.5Kgf/cm2
6.
 Flow coefficient Cv value: flow rate (in gallons / minute) of water at 60F passing through the valve when the pressure differential of valve is maintained at1b/in2;that is, flow volume passing through the valve per minute.
7.
 Sweating phenomenon when the temperature of fluid flowing in the pipe is lower than the atmospheric temperature outside the pipe, air will condense to form water drop on the surface of external wall from the pipe. This phenomenon is called as sweating phenomenon.
8.
 Temperature and pressure table PRESSURE TEMPERATURE RATING
Pressure-Temperature Ratings For Cast Bronze Valve (MSS SP-80)
Maximum Allowable Non-shock Pressure 　　　　　　　　　 working Pressure-(PSI)
PRESS.
CLASS
125
150
200
300
END CONN.
Threaded
Threaded
Flanged(2)
Threaded
Thraded(5)
Threaded
TEMP.
deg.℉
Material
ASTM-B62
ASTM-B61
-20 to 150
200
250
300
350
400
406
450
500
550
200
185
170
155
140
-
125
120(4)
-
-
300
270
240
210
180
-
150
145(4)
-
-
225
210
195
180
165
-
150
-
-
-
400
375
350
325
300
275
-
250
225
200
1000
920
830
740
650
560
-
480
390
300
600
560
525
490
450
410
-
375
340
300
Notes: (2)P-T Ratings ANSI B16.24
(4)Some codes (i.e.ASME BPVC.Section I) limit the rating Temp. of the indicated material to 406℉ (208℃)
(5)Alternate ratings for valve size 1/8 2 having threaded ends and union ring body-bonnet joints.
Maximum Allowable Non-shock Pressure 　　　　　　　　　Working Pressure-(Bar)
PRESS.
CLASS
125
150
200
300
END CONN.
Threaded
Threaded
Flanged(2)
Threaded
Thraded(5)
Threaded
Temperature.
deg.℃
Material
ASTM-B62
ASTM-B61
-30 to 65
75
100
125
150
175
200
208
225
232
250
275
288
13.8
13.4
12.5
11.6
10.7
9.8
8.9
8.6
-
8.2(4)
-
-
20.6
19.9
18.1
16.3
14.5
12.7
10.9
10.3
-
10.0(4)
-
-
-
15.5
15.2
14.2
13.3
12.4
11.5
10.6
10.3
-
-
-
-
-
27.6
27.0
25.4
23.9
22.5
20.8
19.2
-
17.7
-
16.2
14.6
13.8
69.0
67.0
61.6
56.1
50.6
45.2
39.7
--
34.3
-
28.8
23.4
20.7
41.4
40.6
38.3
36.0
33.6
31.3
29.0
-
26.6
-
24.3
22.0
20.7
1 bar = 100kPa
Pressure-Temperature Ratings For Cast Iron Valve (MSS SP-70)
Maximum Allowable Non-shock Pressure 　　　　　　　　　　Working Pressure-(PSI)
CLASS
125
250
800Hyd.
Temperature
Degrees ℉
NPS
2-12
NPS
14-24
NPS
30-48
NPS
2-12
NPS
14-24
NPS
2-12
-20 to 150
200
225
200
190
180
150
135
130
150
115
100
500
450
440
300
280
270
800
250
275
300
175
170
165
125
120
110
85
65
50
415
395
375
260
250
240
1
325
350
375
155
150
145
105
100
1
355
335
325
230
220
210
1
400
425
450
140
130
125
1
1
290
270
250
200
1
Maximum Allowable Non-shock Pressure 　　　　　　　　　　Working Pressure-(Bar)
CLASS
Class 125
Class 250
Class 800Hyd.
Temperature
Degrees ℃
NPS
2-12
NPS
14-24
NPS
30-48
NPS
2-12
NPS
14-24
NPS
2-12
-29 to 65
100
125
13.8
12.8
11.9
10.3
9.2
8.5
10.3
7.4
5.3
34.5
30.9
28.3
20.7
19.0
17.7
55.0
150
175
200
11.2
10.4
9.6
7.7
7.0
3.3
25.7
23.1
20.6
16.5
15.3
14.0
1
205
225
232
8.8
8.6
1
1
17.9
17.2
13.8
1