KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
Dual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems
FEATURES
• Light weight, versatile design, 80 to 90%
lighter than conventional full-body check
valves. This reduces pipe supports, simplifies
piping, easier, less costly installation.
- Reduced thermal and seismic
considerations.
- No need for additional expensive support.
- Optimum space utilization; simplified piping.
• Spring-loaded, double door design has low
cracking pressure.
• Discs open 85° to ensure positive closing.
• Materials and trims available for all services
within temperature range.
• Extended leg springs prevent seat wear
caused by scrubbing.
• Springs are precisely calculated to increase
the responsiveness of the disc, thus reducing
damaging effects of water hammer.
• Resilient or metal-to-metal seat available.
• Buna-N, FKM, EPDM (and other materials as
required) molded into the body.
GENERAL APPLICATION
TECHNICAL DATA
• Back flow prevention in pump or multi-pump
systems.
• For high slam risk systems requiring high
flow decelerations.
• Combined low line velocity and low pressure
tightness.
• Vacuum breaker for storage tank protection.
• High capacity/low pressure drop to ensure
economical use.
Size range:
DN 50 to 1200
(NPS 2 to 48)
Pressure classes:
ASME 125 to 900
Temperature range: -40°C to 538°C
(-40°F to 1000°F)
Industry standards
• ASME B16.1, B16.5, B16.24, B16.34, B16.47
and B31.1
• API 594 and 598
• NACE MR-01-75
www.pentair.com/valves
© 2012 Pentair plc. All Rights Reserved.
VCTDS-02520-EN 16/03
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
SIZING AND OTHER PARAMETERS
Dual disc check valve can be installed in both
horizontal and vertical piping systems. (Contact
Sales office for vertical DOWN installations.)
The accurate sizing of check valves is crucial
to ensure an acceptable pressure drop and
a long service life. The pressure drop can be
calculated, for liquid or gas, using the charts
and calculations shown on page 3. It is a known
fact that all check valve discs flutter. The higher
the velocity and turbulence of the media (liquid
or gas) moving through the piping system,
the greater the flutter and wear. Once again,
Keystone's know-how has met the challenge.
Our design provides long service life if the
velocity is kept within the flow rate ranges
shown in table, and if a minimum of 5 pipe
diameters is maintained downstream from a
likely cause of turbulence (i.e., pump discharge,
reducers, or elbows).
THE IMPORTANCE OF REDUCING WATER
HAMMER
What is water hammer?
Water hammer is a term used to describe
hydraulic noise caused by a sudden change in
the velocity of a flowing liquid. The resultant
noise is just a symptom of a series of potentially
destructive pressure waves traveling through
the piping system.
Swing check problems
Conventional swing check valves are
notorious for causing water hammer in
piping systems. Because the single disc in
a swing check valve has a greater distance
to travel and because all check valve discs
lag behind a change in velocity, backflow
is usually necessary to seat the disc.
The sudden stoppage of a liquid flow converts
the velocity’s kinetic energy into a pressure
shock wave. This destructive force causes the
pipe to both expand and contract alternately
until friction in the pipeline eliminates the
pressure wave. The magnitude of a pressure
wave depends upon the velocity of the backflow
and the mass of the liquid at the time the valve
closes. The longer the check valve is open with
backflow, the greater the pressure wave shock.
RECOMMENDED FLOW RATE RANGES
Horizontal installation only
Media
Flow rate
Liquid
3 to 11 feet/second
0.91 to 3.35 m/second
Gas
20 to 250 feet/second
6.1 to 76.2 m/second
Contact your sales representative for check valves in
vertical installation.
Dual disc check solutions
The dual disc design produce significantly less
water hammer than single disc check valves.
The light weight dual discs, with the assistance
of spring torque, move to the closed (or near
closed) position prior to flow reversal, thus
reducing water hammer.
HIGH PERFORMANCE AND LONG SERVICE
LIFE
Our spring-loaded dual discs, hinged on
the side in horizontal piping, do not depend
solely upon backflow or gravity for closure.
Springs are precisely calculated to increase
the response of the disc, which substantially
reduces any damaging effects of water
hammer. The discs are relatively stable and
wear is minimal in a wide flow range. Extended
leg springs prevent the occurrence of seat wear
caused by scrubbing. This is accomplished
by the springs’ torque placement beyond
the center point of mass and a calculated
clearance between the hinge pin and the discs’
lug.
Discs open to 85° to ensure
positive closing
A broad, flat seating surface, located on the valve body, is out of the direct flow.
Both metal and soft seats are available to assure fluid and temperature compatibility.
Metal-to-metal seat
Including full penetrant
weld overlays of 316 and
410 stainless steel.
Soft seat
Buna-N, FKM, EPDM (and
other materials as required)
molded into the body.
Cracking pressure is less
than 0.25 psi (0.02 bar)
2
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
PRESSURE DROP CALCULATIONS FOR GAS
Pressure drop for gas media across the
Model MB, in horizontal installation, can be
determined using the following equation and
Cv and Cracking Pressure shown for each valve
size. Additional equations may be necessary in
order to calculate the pressure drop. Contact
your local sales representative for check valves
in vertical installation.
American standard
ΔP =
GT
P
(
Q
1360 Cv
)
2
+ Pc
SCFH = ACFH
where:
Cv = Flow coefficient (from table below)
G = Specific gravity of gas
P = Inlet pressure, in psia (psig + 14.7)
Pc = Cracking pressure (from table below)
Q = Gas flow rate, in SCFH
ΔP= Pressure drop across valve, in psi
T = Temperature, absolute (°F + 460)
( )( )
P
14.7
520
T
where:
ACFH= Actual cubic feet per hour
SCFH = Standard cubic feet per hour
WATER STANDARD CONDITIONS
1,000,000
Cv AND CRACKING PRESSURE
700,000
500,000
400,000
Size DN
(NPS)
50 (2)
65 (2.5)
80 (3)
100 (4)
125 (5)
150 (6)
200 (8)
250 (10)
300 (12)
350 (14)
400 (16)
450 (18)
500 (20)
600 (24)
750 (30)
900 (36)
1050 (42)
1200 (48)
300,000
200,000
0)
120
(DN
0)
48”
110
N
(D
42”
)
600
(DN
36”
50)
7
(DN
30”
100,000
70,000
50,000
40,000
30,000
)
600
(DN
24”
)
500
N
(D
20”
50)
4
(DN
)
18”
400
(DN
16”
50)
3
(DN
00)
14”
N3
(D
12”
)
250
(DN
10”
00)
N2
8” (D
20,000
10,000
5,000
4,000
3,000
2,000
50)
N1
6” (D
25)
N1
5” (D
)
100
N
4” (D
1,000
700
500
400
300
200
48
77
135
270
450
720
1400
2600
3850
5000
7250
10,000
12,400
20,400
38,000
60,000
89,000
124,000
Cracking
pressure (psi)
0.228
0.183
0.098
0.174
0.198
0.208
0.152
0.235
0.242
0.237
0.219
0.148
0.123
0.093
0.099
0.097
0.089
0.066
0)
N8
3” (D
65)
(DN
2½”
0)
N5
2” (D
100
nd
co
se
ft/
11
70
50
40
30
20
e
ang
ize r
ms
imu
t
p
O
ed
end
mm
reco
Not
100
70
40
50
30
20
10
7
5
4
3
2
1
0.7
0.3
0.4
0.5
0.2
10
0.1
G.P.M.
7,000
Cv
Head loss (feet)
3
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
B
D
B
D
C
A
C
A
Flange
Minimum
Bore
flange bore
Minimum
Flange
Bore
Minimum
Wafer body, NPS 2 to 48
Wafer body
Lug body
ASME CLASS 125 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
500
600
750
900
1050
1200
A
105
124
137
175
197
222
279
340
410
451
514
549
606
718
883
1048
1219
1384
B
54
54
57
64
70
76
95
108
143
184
191
203
213
222
305
368
432
524
C
52
63
78
102
127
154
203
254
303
318
381
429
478
575
743
889
1041
1194
D
16
25
33
35
54
70
83
83
113
137
160
210
229
303
381
425
Weight
kgs
2
3
3
5
7
9
18
29
50
83
116
143
172
261
485
890
1270
1778
Wafer
Stud
length
140
152
165
165
184
203
241
260
305
324
330
356
375
400
540
648
730
845
Stud
Dia.
16
16
16
16
19
19
19
22
22
25
25
29
29
32
32
38
38
38
D
⅝
1
15/16
115/16
37/16
3⅜
39/16
31/16
4¼
5⅜
63/16
8¼
99/16
125/16
15
16¾
Weight
lbs.
4
6
7
12
15
20
40
65
110
183
255
315
380
575
1070
1962
2800
3920
Wafer
Stud
length
5½
6
6½
6½
7¼
8
9½
10¼
12
12¾
13
14
14¾
15¾
21¼
25½
28¾
33¼
Stud
Dia.
⅝
⅝
⅝
⅝
¾
¾
¾
⅞
⅞
1
1
1⅛
1⅛
1¼
1¼
1½
1½
1½
ASME CLASS 125 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
14
16
18
20
24
30
36
42
48
A
4⅛
4⅞
5⅜
6⅞
7¾
8¾
11
13⅜
16⅛
17¾
20¼
21⅝
23⅞
28¼
34¾
41¼
48
54½
Lug body, NPS 2 to 12
B
2⅛
2⅛
2¼
2½
2¾
3
3¾
4¼
5⅝
7¼
7½
8
8⅜
8¾
12
14½
17
20⅝
C
21/16
215/32
31/16
4
5
61/16
8
10
1115/16
12½
15
16⅞
1813/16
22⅝
29¼
35
41
47
No. reqd.
4
4
4
8
8
8
8
12
12
12
16
16
20
20
28
32
36
44
Weight
kgs
7
6
7
13
16
19
40
62
112
123
200
190
221
298
577
821
1442
2137
Lug/flanged
Bolt
Bolt
length
Dia.
44
16
51
16
51
16
51
16
57
19
57
19
64
19
64
22
70
22
76
25
76
25
83
29
83
29
89
32
121
32
140
38
152
38
159
38
No. reqd.
8
8
8
16
16
16
16
24
24
24
32
32
40
40
56
64
72
88
No. reqd.
4
4
4
8
8
8
8
12
12
12
16
16
20
20
28
32
36
44
Weight
lbs.
16
14
15
29
36
41
88
136
248
271
441
419
488
657
1273
1811
3179
4711
Lug/flanged
Bolt
Bolt
length
Dia.
1¾
⅝
2
⅝
2
⅝
2
⅝
2¼
¾
2¼
¾
2½
¾
2½
⅞
2¾
⅞
3
1
3
1
3¼
1⅛
3¼
1⅛
3½
1¼
4¾
1¼
5½
1½
6
1½
6¼
1½
No. reqd.
8
8
8
16
16
16
16
24
24
24
32
32
40
40
56
64
72
88
4
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
ASME CLASS 150 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
500
600
750
900
1050
1200
A
105
124
137
175
197
222
279
340
410
451
514
549
606
718
883
1048
1219
1384
B
60
67
73
73
86
98
127
146
181
184
191
203
219
222
305
368
432
524
C
49
60
74
97
122
146
194
243
289
318
381
429
478
616
743
889
1041
1194
D
6
16
22
35
54
70
83
83
113
137
160
210
229
303
381
425
Weight
kgs
3
5
6
8
12
16
32
48
78
91
125
143
197
281
558
915
1270
1778
Wafer
Stud
length
146
159
171
171
184
203
241
267
305
324
330
356
381
400
540
648
730
845
Stud
Dia.
16
16
16
16
19
19
19
22
22
25
25
29
29
32
32
38
38
38
D
0.25
0.625
0.875
1.375
2.125
2.75
3.25
3.25
4.4375
5.375
6.3125
8.25
9
12
15
16.75
Weight
lbs.
6
10
13
17
27
35
70
106
172
200
275
315
435
620
1230
2017
2800
3920
Wafer
Stud
length
5¾
6¼
6¾
6¾
7¼
8
9½
10½
12
12¾
13
14
15
15¾
21¼
25½
28¾
33¼
Stud
Dia.
⅝
⅝
⅝
⅝
¾
¾
¾
⅞
⅞
1
1
1⅛
1⅛
1¼
1¼
1½
1½
1½
ASME CLASS 150 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
14
16
18
20
24
30
36
42
48
A
4⅛
4⅞
5⅜
6⅞
7¾
8¾
11
13⅜
16⅛
17¾
20¼
21⅝
23⅞
28¼
34¾
41¼
48
54½
B
2⅜
2⅝
2⅞
2⅞
3⅜
3⅞
5
5¾
7⅛
7¼
7½
8
8⅝
8¾
12
14½
17
20⅝
C
115/16
21⅓2
229/32
327/32
413/16
5¾
7⅝
99/16
11⅜
12½
15
16⅞
1813/16
22⅝
29¼
35
41
47
No. reqd.
4
4
4
8
8
8
8
12
12
12
16
16
20
20
28
32
36
44
Weight
kgs
9
12
7
13
19
25
41
71
114
132
210
195
227
309
599
861
1468
2222
Lug/flanged
Bolt
Bolt
length
Dia.
44
16
51
16
51
16
51
16
57
19
57
19
64
19
64
22
70
22
76
25
76
25
83
29
83
29
89
32
121
32
140
38
152
38
159
38
No. reqd.
8
8
8
16
16
16
16
24
24
24
32
32
40
40
56
64
72
88
No. reqd.
4
4
4
8
8
8
8
12
12
12
16
16
20
20
28
32
36
44
Weight
lbs.
19
27
15
29
41
55
91
156
252
291
464
431
501
682
1321
1898
3236
4899
Lug/flanged
Bolt
Bolt
length
Dia.
1¾
⅝
2
⅝
2
⅝
2
⅝
2¼
¾
2¼
¾
2½
¾
2½
⅞
2¾
⅞
3
1
3
1
3¼
1⅛
3¼
1⅛
3½
1¼
4¾
1¼
5½
1½
6
1½
6¼
1½
No. reqd.
8
8
8
16
16
16
16
24
24
24
32
32
40
40
56
64
72
88
5
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
NOTES
1. Stud and bolt length are for raised face connections. Contact your sales representative for other information
on body styles. Bolt length is for threaded lug/flange body.
2. Weights are approximate.
3. Threaded and through-bolt lug body available.
4. 'C' dimension is minimum flange bore.
5. 'A' dimension for NPS 30 and larger steel valves per ASME B16.47 Series A and MSS-SP-44.
Flanged body, NPS 12 to 48
ASME CLASS 300 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
500
600
750
900
1050
1200
A
111
130
149
181
216
251
308
362
422
486
540
597
654
775
953
1118
1289
1492
B
60
67
73
73
86
98
127
146
181
222
232
264
292
318
368
483
568
629
C
49
60
74
96
122
146
194
243
289
318
364
429
456
548
730
889
1041
1194
D
6
16
22
35
54
70
83
81
105
122
143
179
230
284
375
419
Weight
kgs
3
5
7
8
16
20
37
57
91
147
188
252
329
499
930
1621
2622
2981
Wafer
Stud
length
152
171
184
191
210
229
273
311
356
406
425
464
502
552
673
819
940
1029
Stud
Dia.
16
19
19
19
19
19
22
25
29
29
32
32
32
38
44
51
51
51
D
¼
⅝
⅞
1⅜
2⅛
2¾
3¼
33/16
4⅛
413/16
5⅝
71/16
91/16
113/16
14¾
16.5
Weight
lbs.
7
11
15
18
35
45
82
125
200
325
415
555
725
1100
2050
3573
5780
6572
Wafer
Stud
length
6
6¾
7¼
7½
8¼
9
10¾
12¼
14
16
16¾
18¼
19¾
21¾
26½
32¼
37
40½
Stud
Dia.
⅝
¾
¾
¾
¾
¾
⅞
1
1⅛
1⅛
1¼
1¼
1¼
1½
1¾
2
2
2
ASME CLASS 300 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
14
16
18
20
24
30
36
42
48
A
4⅜
B
2⅜
C
115/16
5⅛
5⅞
7⅛
8½
9⅞
12⅛
14¼
16⅝
19⅛
21¼
23½
25¾
30½
37½
44
50¾
58.75
2⅝
2⅞
2⅞
3⅜
3⅞
5
5¾
7⅛
8¾
9⅛
10⅜
11½
12½
14½
19
22⅜
24.75
211/32
229/32
313/16
413/16
5¾
7⅝
99/16
11⅜
12½
145/16
16⅞
1715/16
219/16
28¾
35
41
47
No. reqd.
8
8
8
8
8
12
12
16
16
20
20
24
24
24
28
32
36
40
Weight
kgs
9
12
12
17
21
37
68
114
164
246
359
358
354
459
895
1781
2191
3018
Lug/flanged
Bolt
Bolt
length
Dia.
51
16
57
19
64
19
64
19
70
19
70
19
83
25
90
25
95
29
95
29
108
32
102
32
108
32
121
38
146
44
165
51
184
51
197
51
No. reqd.
16
16
16
16
16
24
24
32
32
40
40
48
48
48
56
64
72
80
No. reqd.
8
8
8
8
8
12
12
16
16
20
20
24
24
24
28
32
36
40
Weight
lbs.
19
27
27
38
46
81
151
251
361
543
792
790
780
1011
1974
3926
4830
6653
Lug/flanged
Bolt
Bolt
length
Dia.
2
⅝
2¼
¾
2½
¾
2½
¾
2¾
¾
2¾
¾
3¼
1
3½
1
3¾
1⅛
3¾
1⅛
4¼
1¼
4
1¼
4¼
1¼
4¾
1½
5¾
1¾
6½
2
7¼
2
7¾
2
No. reqd.
16
16
16
16
16
24
24
32
32
40
40
48
48
48
56
64
72
80
6
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
B
D
B
D
C
A
C
A
Flange
Minimum
Bore
flange bore
Minimum
Flange
Bore
Minimum
Wafer body, NPS 2 to 48
Wafer body
Lug body
ASME CLASS 600 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
500
600
A
111
130
149
194
241
267
321
400
457
492
565
613
683
791
B
60
67
73
79
105
137
165
213
229
273
305
362
368
438
C
49
60
74
96
122
146
194
243
289
318
364
410
456
548
D
3
6
22
25
36
51
58
88
70
110
94
135
167
Weight
kgs
3
5
7
12
23
36
61
108
151
206
290
404
508
925
Wafer
Stud
length
171
191
203
229
273
311
362
432
457
514
565
641
660
775
D
⅛
¼
⅞
1
17/16
2
29/32
315/32
2¾
45/16
311/16
55/16
69/16
Weight
lbs.
7
11
15
26
50
80
135
238
333
455
640
890
1120
2040
Stud
length
6¾
7½
8
9
10¾
12¼
14¼
17
18
20¼
22¼
25¼
26
30½
ASME CLASS 600 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
14
16
18
20
24
Lug body, NPS 2 to 12
A
4⅜
B
2⅜
C
115/16
5⅛
5⅞
7⅝
9½
10½
12⅝
15¾
18
19⅜
22¼
24⅛
26⅞
31⅛
2⅝
2⅞
3⅛
4⅛
5⅜
6½
8⅜
9
10¾
12
14¼
14½
17¼
211/32
229/32
313/16
413/16
5¾
7⅝
99/16
11⅜
12½
145/16
16⅛
1715/16
219/16
Stud
Dia.
16
19
19
22
25
25
29
32
32
35
38
41
41
48
No. reqd.
8
8
8
8
8
12
12
16
20
20
20
20
24
24
Weight
kgs
8
12
12
23
44
68
118
209
266
371
480
459
580
840
Lug/flanged
Bolt
Bolt
length
Dia.
57
16
64
19
70
19
76
22
89
25
89
25
102
29
114
32
114
32
121
35
133
38
140
41
146
41
165
48
No. reqd.
16
16
16
16
16
24
24
32
40
40
40
40
48
48
No. reqd.
8
8
8
8
8
12
12
16
20
20
20
20
24
24
Weight
lbs.
18
27
27
51
97
151
261
460
587
817
1058
1011
1279
1851
Bolt
length
2¼
2½
2¾
3
3½
3½
4
4½
4½
4¾
5¼
5½
5¾
6½
Lug/flanged
Bolt
Dia.
⅝
¾
¾
⅞
1
1
1⅛
1¼
1¼
1⅜
1½
1⅝
1⅝
1⅞
No. reqd.
16
16
16
16
16
24
24
32
40
40
40
40
48
48
Wafer
Stud
Dia.
⅝
¾
¾
⅞
1
1
1⅛
1¼
1¼
1⅜
1½
1⅝
1⅝
1⅞
NOTE
Larger sizes are available on request.
7
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
NOTES
1. Stud and bolt length are for raised face connections. Contact your sales representative for other information
on body styles. Bolt length is for threaded lug/flange body.
2. Weights are approximate.
3. Threaded and through-bolt lug body available.
4. 'C' dimension is minimum flange bore.
5. 'A' dimension for NPS 30 and larger steel valves per ASME B16.47 Series A and MSS-SP-44.
Flanged body, NPS 12 to 48
ASME CLASS 900 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
500
600
A
143
165
168
206
248
289
359
435
498
521
575
638
699
838
B
70
83
83
102
159
206
241
292
356
384
451
451
495
C
43
54
67
87
110
132
173
216
257
292
325
367
456
546
D
2
8
14
27
36
46
59
51
67
65
135
143
Weight
kgs
6
7
11
18
104
176
245
420
523
598
647
1238
104
Wafer
Stud
length
222
248
235
279
432
483
552
635
673
781
806
940
432
Stud
Dia.
22
25
22
29
35
35
35
38
41
48
51
56
35
Weight
lbs.
14
16
24
40
115
229
388
540
926
1152
1318
1426
2729
Wafer
Stud
length
8¾
9¾
9¼
11
14
17
19
21¾
25
26½
30¾
31¾
37
Stud
Dia.
⅞
1
⅞
1⅛
1⅛
1⅜
1⅜
1⅜
1½
1⅝
1⅞
2
2⅕
ASME CLASS 900 DIMENSIONS (in)
Size
NPS
2
2½
3
4
6
8
10
12
14
16
18
20
24
A
5⅝
B
2¾
C
111/16
6½
6⅝
8⅛
11⅜
14⅛
17⅛
19⅝
20½
22⅝
25⅛
27½
33
3¼
3¼
4
6¼
8⅛
9½
11½
14
15⅛
17¾
17¾
19½
2⅛
2⅝
37/16
53/16
613/16
8½
10⅛
11½
1213/16
147/16
1715/16
21½
D
1/16
5/16
9/16
11/16
113/32
113/16
25/16
2
2⅝
29/16
55/16
5⅝
No. reqd.
8
8
8
8
12
16
20
20
20
20
20
20
12
Weight
kgs
12
18
20
31
201
300
445
563
941
643
858
1264
201
Lug/flanged
Bolt
Bolt
length
Dia.
76
22
83
25
76
22
89
29
114
35
121
35
133
35
140
38
146
41
165
48
171
51
216
64
114
35
No. reqd.
16
16
16
16
24
32
40
40
40
40
40
40
24
No. reqd.
8
8
8
8
12
12
16
20
20
20
20
20
20
Weight
lbs.
26
40
44
68
240
443
661
981
1241
2074
1418
1892
2786
Lug/flanged
Bolt
Bolt
length
Dia.
3
⅞
3¼
1
3
⅞
3½
1⅛
4
1⅛
4½
1⅜
4¾
1⅜
5¼
1⅜
5½
1½
5¾
1⅝
6½
1⅞
6¾
2
8½
2½
No. reqd.
16
16
16
16
24
24
32
40
40
40
40
40
40
NOTE
Larger sizes are available on request.
8
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
ASME CLASS 1500 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
350
400
450
A
143
165
175
210
254
283
352
435
521
578
641
705
B
70
83
83
102
159
206
248
305
356
384
468
C
43
54
67
87
110
132
173
216
257
292
325
349
D
2
8
14
27
36
43
57
51
67
68
Weight
kgs
6
7
11
20
50
99
180
329
430
627
863
Wafer
Stud
length
216
260
298
419
501
591
686
768
838
965
Stud
Dia.
22
29
32
35
41
48
51
57
64
70
Weight
lbs.
14
16
25
43
110
219
397
725
948
1380
1900
2729
Wafer
Stud
length
8½
10¼
11¾
16½
19¾
23¼
27
30¼
33
38
37
Stud
Dia.
⅞
1⅛
1¼
1⅜
1⅝
1⅞
2
2¼
2½
2¾
2⅕
ASME CLASS 1500 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
14
16
18
24
A
5⅝
B
2¾
C
111/16
6½
6⅞
8¼
10
11⅛
13⅛
17⅛
20½
22¾
25¼
27¾
33
3¼
3¼
4
6¼
8⅛
9¾
12
14
15⅛
187/16
19½
2⅛
2⅝
4⅙
4⅚
5½
613/16
8½
10⅛
11½
1213/16
13¾
21½
D
1/16
5/16
9/16
111/16
113/32
111/16
2¼
2
2⅝
211/16
5⅝
No. reqd.
8
8
8
8
12
12
12
16
16
16
16
Weight
kgs
14
25
36
93
175
351
567
816
1093
1519
Lug/flanged
Bolt
Bolt
length
Dia.
108
22
133
29
152
32
184
35
210
41
241
48
267
51
-
No. reqd.
8
8
8
12
12
12
16
-
No. reqd.
8
8
8
8
12
12
12
16
16
16
16
20
Weight
lbs.
31
55
80
205
385
780
1250
1800
2410
3349
2786
Lug/flanged
Bolt
Bolt
length
Dia.
4¼
⅞
5¼
1⅛
6
1¼
7¼
1⅜
8¼
1⅝
9½
1⅞
10½
2
8½
2½
No. reqd.
8
8
8
12
12
12
16
40
NOTE
Larger sizes are available on request.
9
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
ASME CLASS 2500 DIMENSIONS (mm)
Size
DN
50
65
80
100
125
150
200
250
300
A
146
168
197
235
279
318
387
476
549
B
70
83
86
105
159
206
254
305
C
43
54
67
87
110
132
173
216
257
D
2
6
11
27
43
46
56
Weight
kgs
7
10
14
24
86
129
228
437
Wafer
Stud
length
248
305
362
508
591
743
845
Stud
Dia.
25
32
38
51
51
64
70
Weight
lbs.
15
22
31
54
190
285
502
963
Wafer
Stud
length
9¾
12
14¼
20
23¼
29¼
33¼
Stud
Dia.
1
1¼
1½
2
2
2½
2¾
ASME CLASS 2500 DIMENSIONS (in)
Size
NPS
2
2½
3
4
5
6
8
10
12
A
5¾
B
2¾
C
111/16
6⅝
7¾
9¼
11
12½
15¼
18¾
21⅝
3¼
3⅜
4⅛
6¼
8⅛
10
12
2⅛
2⅝
34/9
45/16
53/16
613/16
8½
10⅛
D
1/16
¼
7/16
11/16
111/16
113/16
23/16
No. reqd.
8
8
8
8
12
12
12
Weight
kgs
16
32
48
195
263
490
726
Lug/flanged
Bolt
Bolt
length
Dia.
133
25
165
32
191
38
254
51
273
51
343
64
375
70
No. reqd.
8
8
8
8
12
12
12
No. reqd.
8
8
8
8
12
12
12
Weight
lbs.
35
71
105
430
580
1080
1600
Lug/flanged
Bolt
Bolt
length
Dia.
5¼
1
6½
1¼
7½
1½
10
2
10¾
2
13½
2½
14¾
2¾
No. reqd.
8
8
8
8
12
12
12
NOTE
Larger sizes are available on request.
10
KEYSTONE GULF VALVES CHECK VALVES
MODEL MB
Specifications call for NPS 6, ASME 300 Wafer Check with raised face end connection, carbon steel through-bolt
lug body with Monel® discs, PTFE seat and Inconel®-X spring. Model Number: 6MBTBL30-2073-XR
SELECTION GUIDE
Example:
Size range
6
MB
TBL
30
20
7
NPS 2 to 48 (DN 50 to 1200)
Type
MB Wafer
Lug/flange
TL
Threaded lug (NPS 2 to 16) (DN 50 to 400)
TBL Through bolt lug (NPS 2 to 16) (DN 50 to 400)
TF
Threaded flange (NPS 18 to 48) (DN 450 to 1200)
TBF Through bolt flange (NPS 18 to 48) (DN 450 to 1200)
ASME/API Series
12
125 Class
60600 Class
15150 Class
90
25250 Class
150 1500 Class
30300 Class
250 2500 Class
900 Class
Body material
20
WCB steel, ASTM A216 Gr. WCB
30
Ductile iron, ASTM A395 Gr. 60-40-18
60
316 S/S, ASTM A351 Gr. CF8M
X0
Refer to modification number
Disc material
Shaft-thrust bearings
3
304 S/S ASTM A351 Gr CF8
316 S/S
4
316 S/S, ASTM A351 Gr. CF8M
Monel®
8
Aluminum Bronze, ASTM B148 Alloy C95200
316 S/S
X
Refer to Modification Number
316 S/S
Seat
Operating temperature
1Buna-N
-70° to 250°F (-57° to 120°C)
2Neoprene
-40° to 250°F (-40° to 120°C)
3PTFE
-40° to 300°F (-40° to 150°C)
4FKM
-40° to 400°F (-40° to 200°C)
6
Same as body material
7Metal
Same as body material
9EPDM
0° to 300°F (-18° to 150°C)
X
X
R
316 S/S
7Monel®, ASTM A494, M35-1
316 S/S overlay
3
NOTES
1. The standard materials of construction for the
Shafts-Thrust Bushings are determined by the
disc material.
2. 316 S/S overlay seat is available in all sizes.
3. 316 S/S spring(s) are furnished as standard for all
elastomer seated valves.
4.Inconel® X-750 spring(s) are used as standard for
metal seated valves.
5.Inconel®-X spring(s) must be used to comply with
NACE MR-01-75.
6. Flat Face end connections are standard ductile
iron body valves.
7. Raised Face spiral serrated end connections are
standard for all ASME Class 150 through 900
valves.
8. Temperatures are for general guidance and could
vary depending upon application and body/internal
trim selection.
9. For PTFE seated valves, maximum seat leakage is
equal to metal-seated rate per API 598.
Refer to modification number
Spring material
S
316 S/S
XInconel®-X 750
End connections
F
Flat face
J
Ring joint
R
Raised face, spiral serrated per API 594
11
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