KEYSTONE GULF VALVES CHECK VALVES MODEL MBDual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems KEYSTONE GULF VALVES CHECK VALVES MODEL MB

Dual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems

KEYSTONE GULF VALVES CHECK VALVESMODEL MB

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.

TECHNICAL DATA

Size range: DN 50 to 1200 (NPS 2 to 48)

Pressure classes: ASME 125 to 900Temperature range: -40°C to 538°C

(-40°F to 1000°F)

GENERAL APPLICATION

• 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.

Industry standards• ASME B16.1, B16.5, B16.24, B16.34, B16.47

and B31.1• API 594 and 598• NACE MR-01-75

VCTDS-02520-EN 16/03www.valves.emerson.com © 2017 Emerson. All rights reserved.

2

RECOMMENDED FLOW RATE RANGESHorizontal installation onlyMedia Flow rateLiquid 3 to 11 feet/second

0.91 to 3.35 m/secondGas 20 to 250 feet/second

6.1 to 76.2 m/second

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 problemsConventional 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.

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.

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 seatIncluding full penetrant weld overlays of 316 and 410 stainless steel.

Soft seatBuna-N, FKM, EPDM (and other materials as required) molded into the body.

Discs open to 85° to ensure positive closing

Cracking pressure is less than 0.25 psi (0.02 bar)

Contact your sales representative for check valves in vertical installation.


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.

Dual disc check solutionsThe 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.

3

ΔP = + Pc SCFH = ACFHGTP

P14.7

2Q1360 Cv

520T( ) ( )( )

0.1

0.2

0.3

0.4

0.5

0.7

1 2 3 4 5 7 10 20 30 40 50 70 100

1,000,000

700,000500,000400,000300,000200,000

100,000

70,00050,00040,00030,000

20,000

10,000

7,0005,0004,0003,0002,000

1,000700500400300200

100

7050403020

10

48” (DN 1

200)

42” (DN 1

100)

36” (DN 6

00)

30” (DN 7

50)

24” (DN 6

00)

20” (DN 5

00)

18” (DN 4

50)

16” (DN 4

00)

14” (DN 3

50)

12” (DN 3

00)

10” (DN 2

50)

8” (DN 20

0)

6” (DN 15

0)

5” (DN 12

5)

4” (DN 10

0)

3” (DN 80

)

2½” (DN

65)

2” (DN 50

)

50 (2) 48 0.22865 (2.5) 77 0.18380 (3) 135 0.098100 (4) 270 0.174125 (5) 450 0.198150 (6) 720 0.208200 (8) 1400 0.152250 (10) 2600 0.235300 (12) 3850 0.242350 (14) 5000 0.237400 (16) 7250 0.219450 (18) 10,000 0.148500 (20) 12,400 0.123600 (24) 20,400 0.093750 (30) 38,000 0.099900 (36) 60,000 0.0971050 (42) 89,000 0.0891200 (48) 124,000 0.066

where:ACFH = Actual cubic feet per hourSCFH = Standard cubic feet per hour

Cv AND CRACKING PRESSURESize DN (NPS) Cv

Cracking pressure (psi)

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.

where:Cv = Flow coefficient (from table below)G = Specific gravity of gasP = Inlet pressure, in psia (psig + 14.7)Pc = Cracking pressure (from table below)Q = Gas flow rate, in SCFHΔP = Pressure drop across valve, in psiT = Temperature, absolute (°F + 460)

American standard

WATER STANDARD CONDITIONS

Head loss (feet)

G.P.

M.

11 ft/second

Optimum s

ize range

Not recom

mended


4

B

BoreFlangeMinimumC A

D

D

B

Bore

MinimumCA

Flange

2 4⅛ 2⅛ 2 1/16 - 4 5½ ⅝ 4 16 1¾ ⅝ 82½ 4⅞ 2⅛ 2 15/32 - 6 6 ⅝ 4 14 2 ⅝ 83 5⅜ 2¼ 3 1/16 ⅝ 7 6½ ⅝ 4 15 2 ⅝ 84 6⅞ 2½ 4 1 12 6½ ⅝ 8 29 2 ⅝ 165 7¾ 2¾ 5 1 5/16 15 7¼ ¾ 8 36 2¼ ¾ 166 8¾ 3 6 1/16 1 15/16 20 8 ¾ 8 41 2¼ ¾ 168 11 3¾ 8 3 7/16 40 9½ ¾ 8 88 2½ ¾ 1610 13⅜ 4¼ 10 3⅜ 65 10¼ ⅞ 12 136 2½ ⅞ 2412 16⅛ 5⅝ 11 15/16 3 9/16 110 12 ⅞ 12 248 2¾ ⅞ 2414 17¾ 7¼ 12½ 3 1/16 183 12¾ 1 12 271 3 1 2416 20¼ 7½ 15 4¼ 255 13 1 16 441 3 1 3218 21⅝ 8 16⅞ 5⅜ 315 14 1⅛ 16 419 3¼ 1⅛ 3220 23⅞ 8⅜ 18 13/16 6 3/16 380 14¾ 1⅛ 20 488 3¼ 1⅛ 4024 28¼ 8¾ 22⅝ 8¼ 575 15¾ 1¼ 20 657 3½ 1¼ 4030 34¾ 12 29¼ 9 9/16 1070 21¼ 1¼ 28 1273 4¾ 1¼ 5636 41¼ 14½ 35 12 5/16 1962 25½ 1½ 32 1811 5½ 1½ 6442 48 17 41 15 2800 28¾ 1½ 36 3179 6 1½ 7248 54½ 20⅝ 47 16¾ 3920 33¼ 1½ 44 4711 6¼ 1½ 88

50 105 54 52 - 2 140 16 4 7 44 16 865 124 54 63 - 3 152 16 4 6 51 16 880 137 57 78 16 3 165 16 4 7 51 16 8100 175 64 102 25 5 165 16 8 13 51 16 16125 197 70 127 33 7 184 19 8 16 57 19 16150 222 76 154 35 9 203 19 8 19 57 19 16200 279 95 203 54 18 241 19 8 40 64 19 16250 340 108 254 70 29 260 22 12 62 64 22 24300 410 143 303 83 50 305 22 12 112 70 22 24350 451 184 318 83 83 324 25 12 123 76 25 24400 514 191 381 113 116 330 25 16 200 76 25 32450 549 203 429 137 143 356 29 16 190 83 29 32500 606 213 478 160 172 375 29 20 221 83 29 40600 718 222 575 210 261 400 32 20 298 89 32 40750 883 305 743 229 485 540 32 28 577 121 32 56900 1048 368 889 303 890 648 38 32 821 140 38 641050 1219 432 1041 381 1270 730 38 36 1442 152 38 721200 1384 524 1194 425 1778 845 38 44 2137 159 38 88

ASME CLASS 125 DIMENSIONS (in)

Size NPS A B C D

Wafer Lug/flangedWeight Stud

lengthStud Dia. No. reqd.

Weight Bolt length

Bolt Dia. No. reqd.lbs. lbs.

ASME CLASS 125 DIMENSIONS (mm)

Size DN A B C D



Weight Bolt length

Bolt Dia. No. reqd.kgs kgs

Lug body

Minimum flange bore

Wafer body

Lug body, NPS 2 to 12Wafer body, NPS 2 to 48


5

2 4⅛ 2⅜ 1 15/16 - 6 5¾ ⅝ 4 19 1¾ ⅝ 82½ 4⅞ 2⅝ 2 1⅓2 - 10 6¼ ⅝ 4 27 2 ⅝ 83 5⅜ 2⅞ 2 29/32 0.25 13 6¾ ⅝ 4 15 2 ⅝ 84 6⅞ 2⅞ 3 27/32 0.625 17 6¾ ⅝ 8 29 2 ⅝ 165 7¾ 3⅜ 4 13/16 0.875 27 7¼ ¾ 8 41 2¼ ¾ 166 8¾ 3⅞ 5¾ 1.375 35 8 ¾ 8 55 2¼ ¾ 168 11 5 7⅝ 2.125 70 9½ ¾ 8 91 2½ ¾ 1610 13⅜ 5¾ 9 9/16 2.75 106 10½ ⅞ 12 156 2½ ⅞ 2412 16⅛ 7⅛ 11⅜ 3.25 172 12 ⅞ 12 252 2¾ ⅞ 2414 17¾ 7¼ 12½ 3.25 200 12¾ 1 12 291 3 1 2416 20¼ 7½ 15 4.4375 275 13 1 16 464 3 1 3218 21⅝ 8 16⅞ 5.375 315 14 1⅛ 16 431 3¼ 1⅛ 3220 23⅞ 8⅝ 18 13/16 6.3125 435 15 1⅛ 20 501 3¼ 1⅛ 4024 28¼ 8¾ 22⅝ 8.25 620 15¾ 1¼ 20 682 3½ 1¼ 4030 34¾ 12 29¼ 9 1230 21¼ 1¼ 28 1321 4¾ 1¼ 5636 41¼ 14½ 35 12 2017 25½ 1½ 32 1898 5½ 1½ 6442 48 17 41 15 2800 28¾ 1½ 36 3236 6 1½ 7248 54½ 20⅝ 47 16.75 3920 33¼ 1½ 44 4899 6¼ 1½ 88

50 105 60 49 - 3 146 16 4 9 44 16 865 124 67 60 - 5 159 16 4 12 51 16 880 137 73 74 6 6 171 16 4 7 51 16 8100 175 73 97 16 8 171 16 8 13 51 16 16125 197 86 122 22 12 184 19 8 19 57 19 16150 222 98 146 35 16 203 19 8 25 57 19 16200 279 127 194 54 32 241 19 8 41 64 19 16250 340 146 243 70 48 267 22 12 71 64 22 24300 410 181 289 83 78 305 22 12 114 70 22 24350 451 184 318 83 91 324 25 12 132 76 25 24400 514 191 381 113 125 330 25 16 210 76 25 32450 549 203 429 137 143 356 29 16 195 83 29 32500 606 219 478 160 197 381 29 20 227 83 29 40600 718 222 616 210 281 400 32 20 309 89 32 40750 883 305 743 229 558 540 32 28 599 121 32 56900 1048 368 889 303 915 648 38 32 861 140 38 641050 1219 432 1041 381 1270 730 38 36 1468 152 38 721200 1384 524 1194 425 1778 845 38 44 2222 159 38 88



Size NPS A B C D



Weight Bolt length



Size DN A B C D



Weight Bolt length


6

50 111 60 49 - 3 152 16 8 9 51 16 1665 130 67 60 - 5 171 19 8 12 57 19 1680 149 73 74 6 7 184 19 8 12 64 19 16100 181 73 96 16 8 191 19 8 17 64 19 16125 216 86 122 22 16 210 19 8 21 70 19 16150 251 98 146 35 20 229 19 12 37 70 19 24200 308 127 194 54 37 273 22 12 68 83 25 24250 362 146 243 70 57 311 25 16 114 90 25 32300 422 181 289 83 91 356 29 16 164 95 29 32350 486 222 318 81 147 406 29 20 246 95 29 40400 540 232 364 105 188 425 32 20 359 108 32 40450 597 264 429 122 252 464 32 24 358 102 32 48500 654 292 456 143 329 502 32 24 354 108 32 48600 775 318 548 179 499 552 38 24 459 121 38 48750 953 368 730 230 930 673 44 28 895 146 44 56900 1118 483 889 284 1621 819 51 32 1781 165 51 641050 1289 568 1041 375 2622 940 51 36 2191 184 51 721200 1492 629 1194 419 2981 1029 51 40 3018 197 51 80

2 4⅜ 2⅜ 1 15/16 - 7 6 ⅝ 8 19 2 ⅝ 162½ 5⅛ 2⅝ 2 11/32 - 11 6¾ ¾ 8 27 2¼ ¾ 163 5⅞ 2⅞ 2 29/32 ¼ 15 7¼ ¾ 8 27 2½ ¾ 164 7⅛ 2⅞ 3 13/16 ⅝ 18 7½ ¾ 8 38 2½ ¾ 165 8½ 3⅜ 4 13/16 ⅞ 35 8¼ ¾ 8 46 2¾ ¾ 166 9⅞ 3⅞ 5¾ 1⅜ 45 9 ¾ 12 81 2¾ ¾ 248 12⅛ 5 7⅝ 2⅛ 82 10¾ ⅞ 12 151 3¼ 1 2410 14¼ 5¾ 9 9/16 2¾ 125 12¼ 1 16 251 3½ 1 3212 16⅝ 7⅛ 11⅜ 3¼ 200 14 1⅛ 16 361 3¾ 1⅛ 3214 19⅛ 8¾ 12½ 3 3/16 325 16 1⅛ 20 543 3¾ 1⅛ 4016 21¼ 9⅛ 14 5/16 4⅛ 415 16¾ 1¼ 20 792 4¼ 1¼ 4018 23½ 10⅜ 16⅞ 4 13/16 555 18¼ 1¼ 24 790 4 1¼ 4820 25¾ 11½ 17 15/16 5⅝ 725 19¾ 1¼ 24 780 4¼ 1¼ 4824 30½ 12½ 21 9/16 7 1/16 1100 21¾ 1½ 24 1011 4¾ 1½ 4830 37½ 14½ 28¾ 9 1/16 2050 26½ 1¾ 28 1974 5¾ 1¾ 5636 44 19 35 11 3/16 3573 32¼ 2 32 3926 6½ 2 6442 50¾ 22⅜ 41 14¾ 5780 37 2 36 4830 7¼ 2 7248 58.75 24.75 47 16.5 6572 40½ 2 40 6653 7¾ 2 80

NOTES1. 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



Size DN A B C D



Weight Bolt length



Size NPS A B C D



Weight Bolt length


7

B

BoreFlangeMinimumC A

D

D

B

Bore

MinimumCA

Flange

50 111 60 49 - 3 171 16 8 8 57 16 1665 130 67 60 3 5 191 19 8 12 64 19 1680 149 73 74 6 7 203 19 8 12 70 19 16100 194 79 96 22 12 229 22 8 23 76 22 16125 241 105 122 25 23 273 25 8 44 89 25 16150 267 137 146 36 36 311 25 12 68 89 25 24200 321 165 194 51 61 362 29 12 118 102 29 24250 400 213 243 58 108 432 32 16 209 114 32 32300 457 229 289 88 151 457 32 20 266 114 32 40350 492 273 318 70 206 514 35 20 371 121 35 40400 565 305 364 110 290 565 38 20 480 133 38 40450 613 362 410 94 404 641 41 20 459 140 41 40500 683 368 456 135 508 660 41 24 580 146 41 48600 791 438 548 167 925 775 48 24 840 165 48 48

2 4⅜ 2⅜ 1 15/16 - 7 6¾ ⅝ 8 18 2¼ ⅝ 162½ 5⅛ 2⅝ 2 11/32 ⅛ 11 7½ ¾ 8 27 2½ ¾ 163 5⅞ 2⅞ 2 29/32 ¼ 15 8 ¾ 8 27 2¾ ¾ 164 7⅝ 3⅛ 3 13/16 ⅞ 26 9 ⅞ 8 51 3 ⅞ 165 9½ 4⅛ 4 13/16 1 50 10¾ 1 8 97 3½ 1 166 10½ 5⅜ 5¾ 1 7/16 80 12¼ 1 12 151 3½ 1 248 12⅝ 6½ 7⅝ 2 135 14¼ 1⅛ 12 261 4 1⅛ 2410 15¾ 8⅜ 9 9/16 2 9/32 238 17 1¼ 16 460 4½ 1¼ 3212 18 9 11⅜ 3 15/32 333 18 1¼ 20 587 4½ 1¼ 4014 19⅜ 10¾ 12½ 2¾ 455 20¼ 1⅜ 20 817 4¾ 1⅜ 4016 22¼ 12 14 5/16 4 5/16 640 22¼ 1½ 20 1058 5¼ 1½ 4018 24⅛ 14¼ 16⅛ 3 11/16 890 25¼ 1⅝ 20 1011 5½ 1⅝ 4020 26⅞ 14½ 17 15/16 5 5/16 1120 26 1⅝ 24 1279 5¾ 1⅝ 4824 31⅛ 17¼ 21 9/16 6 9/16 2040 30½ 1⅞ 24 1851 6½ 1⅞ 48

Lug body Wafer body

Lug body, NPS 2 to 12Wafer body, NPS 2 to 48



Size DN A B C D



Weight Bolt length



Size NPS A B C D



Weight Bolt length


Minimum flange bore

NOTELarger sizes are available on request.

8

50 143 70 43 - 6 222 22 8 12 76 22 1665 165 83 54 2 7 248 25 8 18 83 25 1680 168 83 67 8 11 235 22 8 20 76 22 16100 206 102 87 14 18 279 29 8 31 89 29 16125 248 - 110 - - - - - - - - -150 289 159 132 27 104 432 35 12 201 114 35 24200 359 206 173 36 176 483 35 16 300 121 35 32250 435 241 216 46 245 552 35 20 445 133 35 40300 498 292 257 59 420 635 38 20 563 140 38 40350 521 356 292 51 523 673 41 20 941 146 41 40400 575 384 325 67 598 781 48 20 643 165 48 40450 638 451 367 65 647 806 51 20 858 171 51 40500 699 451 456 135 1238 940 56 20 1264 216 64 40600 838 495 546 143 104 432 35 12 201 114 35 24

2 5⅝ 2¾ 1 11/16 - 14 8¾ ⅞ 8 26 3 ⅞ 162½ 6½ 3¼ 2⅛ 1/16 16 9¾ 1 8 40 3¼ 1 163 6⅝ 3¼ 2⅝ 5/16 24 9¼ ⅞ 8 44 3 ⅞ 164 8⅛ 4 3 7/16 9/16 40 11 1⅛ 8 68 3½ 1⅛ 166 11⅜ 6¼ 5 3/16 1 1/16 115 14 1⅛ 12 240 4 1⅛ 248 14⅛ 8⅛ 6 13/16 1 13/32 229 17 1⅜ 12 443 4½ 1⅜ 2410 17⅛ 9½ 8½ 1 13/16 388 19 1⅜ 16 661 4¾ 1⅜ 3212 19⅝ 11½ 10⅛ 2 5/16 540 21¾ 1⅜ 20 981 5¼ 1⅜ 4014 20½ 14 11½ 2 926 25 1½ 20 1241 5½ 1½ 4016 22⅝ 15⅛ 12 13/16 2⅝ 1152 26½ 1⅝ 20 2074 5¾ 1⅝ 4018 25⅛ 17¾ 14 7/16 2 9/16 1318 30¾ 1⅞ 20 1418 6½ 1⅞ 4020 27½ 17¾ 17 15/16 5 5/16 1426 31¾ 2 20 1892 6¾ 2 4024 33 19½ 21½ 5⅝ 2729 37 2⅕ 20 2786 8½ 2½ 40

NOTES1. 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



Size DN A B C D



Weight Bolt length



Size NPS A B C D



Weight Bolt length



9

50 143 70 43 - 6 216 22 8 14 108 22 865 165 83 54 2 7 - - 8 - - - -80 175 83 67 8 11 260 29 8 25 133 29 8100 210 102 87 14 20 298 32 8 36 152 32 8125 254 - 110 - - - - - - - - -150 283 159 132 27 50 419 35 12 93 184 35 12200 352 206 173 36 99 501 41 12 175 210 41 12250 435 248 216 43 180 591 48 12 351 241 48 12300 521 305 257 57 329 686 51 16 567 267 51 16350 578 356 292 51 430 768 57 16 816 - - -400 641 384 325 67 627 838 64 16 1093 - - -450 705 468 349 68 863 965 70 16 1519 - - -

2 5⅝ 2¾ 1 11/16 - 14 8½ ⅞ 8 31 4¼ ⅞ 82½ 6½ 3¼ 2⅛ 1/16 16 - - 8 - - - -3 6⅞ 3¼ 2⅝ 5/16 25 10¼ 1⅛ 8 55 5¼ 1⅛ 84 8¼ 4 4⅙ 9/16 43 11¾ 1¼ 8 80 6 1¼ 85 10 - 4⅚ - - - - - - - - -6 11⅛ 6¼ 5½ 1 11/16 110 16½ 1⅜ 12 205 7¼ 1⅜ 128 13⅛ 8⅛ 6 13/16 1 13/32 219 19¾ 1⅝ 12 385 8¼ 1⅝ 1210 17⅛ 9¾ 8½ 1 11/16 397 23¼ 1⅞ 12 780 9½ 1⅞ 1212 20½ 12 10⅛ 2¼ 725 27 2 16 1250 10½ 2 1614 22¾ 14 11½ 2 948 30¼ 2¼ 16 1800 - - -16 25¼ 15⅛ 12 13/16 2⅝ 1380 33 2½ 16 2410 - - -18 27¾ 18 7/16 13¾ 2 11/16 1900 38 2¾ 16 3349 - - -24 33 19½ 21½ 5⅝ 2729 37 2⅕ 20 2786 8½ 2½ 40



Size DN A B C D



Weight Bolt length



Size NPS A B C D



Weight Bolt length



10

50 146 70 43 - 7 248 25 8 16 133 25 865 168 83 54 2 10 - - - - - - -80 197 86 67 6 14 305 32 8 32 165 32 8100 235 105 87 11 24 362 38 8 48 191 38 8125 279 - 110 - - - - - - - - -150 318 159 132 27 86 508 51 8 195 254 51 8200 387 206 173 43 129 591 51 12 263 273 51 12250 476 254 216 46 228 743 64 12 490 343 64 12300 549 305 257 56 437 845 70 12 726 375 70 12

2 5¾ 2¾ 1 11/16 - 15 9¾ 1 8 35 5¼ 1 82½ 6⅝ 3¼ 2⅛ 1/16 22 - - - - - - -3 7¾ 3⅜ 2⅝ ¼ 31 12 1¼ 8 71 6½ 1¼ 84 9¼ 4⅛ 3 4/9 7/16 54 14¼ 1½ 8 105 7½ 1½ 85 11 - 4 5/16 - - - - - - - - -6 12½ 6¼ 5 3/16 1 1/16 190 20 2 8 430 10 2 88 15¼ 8⅛ 6 13/16 1 11/16 285 23¼ 2 12 580 10¾ 2 1210 18¾ 10 8½ 1 13/16 502 29¼ 2½ 12 1080 13½ 2½ 1212 21⅝ 12 10⅛ 2 3/16 963 33¼ 2¾ 12 1600 14¾ 2¾ 12



Size DN A B C D



Weight Bolt length



Size NPS A B C D



Weight Bolt length



11

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

NOTES1. 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.


SELECTION GUIDEExample: 6 MB TBL 30 20 7 3 X RSize rangeNPS 2 to 48 (DN 50 to 1200)TypeMB WaferLug/flangeTL 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 Series12 125 Class 60 600 Class15 150 Class 90 900 Class25 250 Class 150 1500 Class30 300 Class 250 2500 ClassBody material20 WCB steel, ASTM A216 Gr. WCB30 Ductile iron, ASTM A395 Gr. 60-40-1860 316 S/S, ASTM A351 Gr. CF8MX0 Refer to modification numberDisc material Shaft-thrust bearings3 304 S/S ASTM A351 Gr CF8 316 S/S4 316 S/S, ASTM A351 Gr. CF8M 316 S/S7 Monel®, ASTM A494, M35-1 Monel®

8 Aluminum Bronze, ASTM B148 Alloy C95200 316 S/SX Refer to Modification Number 316 S/SSeat Operating temperature1 Buna-N -70° to 250°F (-57° to 120°C)2 Neoprene -40° to 250°F (-40° to 120°C)3 PTFE -40° to 300°F (-40° to 150°C)4 FKM -40° to 400°F (-40° to 200°C)6 316 S/S overlay Same as body material7 Metal Same as body material9 EPDM 0° to 300°F (-18° to 150°C)X Refer to modification numberSpring materialS 316 S/SX Inconel®-X 750End connectionsF Flat faceJ Ring jointR Raised face, spiral serrated per API 594

KEYSTONE GULF VALVES CHECK VALVES MODEL MBDual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems KEYSTONE GULF VALVES CHECK VALVES MODEL MB

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