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» Valve & Pump » MSS SP 128 | Ductile Iron Gate Valves

MSS SP 128 | Ductile Iron Gate Valves

October 15, 2020

Technical Drawings, Design Features & Materials

MSS SP 128 ductile iron gate valves

G.A drawings for ductile iron gate valves designed according to MSS SP 128, metal seated, OS&Y rising stem (A) and non-rising stem (B).

Design features of MSS SP 128 ductile iron gate valves: RF flanged end connection; solid wedge (one-piece); OS&Y rising stem or non-rising stem; bolted bonnet; handwheel operated; metal seated (copper alloy seating surfaces); Class 125 and Class 250 gate valve bodies and bonnets shall be either ASTM A536 or ASTM A395 ductile iron and shall have minimum wall thickness as specified in ASME B16.1 for the corresponding Class and NPS fitting; Class 150 and Class 300 gate valve bodies and bonnets shall be ASTM A395 ductile iron and shall have the minimum wall thickness as specified in ASME B16.42 for the corresponding Class and NPS fitting. Sizes available: 2″~24″ for Class 125; 2″~12″ for Class 150, Class 250, and Class 300. Face-to-face dimensions shall be in accordance with ASME B16.10.

Valve PartMaterials
BodyASTM A536
ASTM A395
BonnetASTM A536
ASTM A395
DiscASTM A536
ASTM A395
Seat Ring
on Wedge
ASTM B62 C83600
Seat Ring
on Body
ASTM B62 C83600
StemASTM B16 C36000
AISI 420
PackingGraphite
HandwheelASTM A536
ASTM A395
*ASTM A536: standard specification for ductile iron castings; Grade 60-40-18 and Grade 65-45-12 are generally used.
*ASTM A395: standard specification for ferritic ductile iron pressure-containing castings for use at elevated temperatures; Grade 60-40-18 and Grade 65-45-15 are generally used.

Dimensions

NPSL
mm
H
mm
D
mm
2"178375178
2-1/2"190422178
3"203475200
4"229606254
5"254683300
6"267828300
8"2921003348
10"3301211400
12"3561421457
14"3811641560
16"4061828560
18"4322047610
20"4572246610
24"5082632765
*For Class 125, metal seated, OS&Y rising stem ductile iron gate valves, 2″~24″.

NPSL
mm
H
mm
D
mm
2"216384175
2-1/2"241436200
3"283492254
4"305610300
5"381715300
6"403812348
8"4191024400
10"4571211457
12"5021386457
*For Class 250, metal seated, OS&Y rising stem ductile iron gate valves, 2″~12″.

NPSL
mm
H
mm
D
mm
2"178302178
2-1/2"190332178
3"203335200
4"229423254
5"254485300
6"267545300
8"292644348
10"330769400
12"356860457
14"381987560
16"4061044560
18"4321148610
20"4571257610
24"5081418765
For Class 125, metal seated, non-rising stem (NRS) ductile iron gate valves, 2″~24″.

NPSL
mm
H
mm
D
mm
2"216343175
2-1/2"241381200
3"283419254
4"305470300
5"381527300
6"403610348
8"419724400
10"457864457
12"502914457
For Class 250, metal seated, non-rising stem (NRS) ductile iron gate valves, 2″~24″.

Dimensions for Class 150 and Class 300 are available upon request.

Tests

Shell test, hydrostatic seat test, and gas seat test shall be made on all completed ductile iron gate valves. The valves in the partially open position with both ends sealed shall be subjected to hydrostatic or gas-test pressure of at least 1.5 times the cold working pressure. The hydrostatic-seat test pressure shall be not less than the rated working pressure, which shall be applied successively on each side of the closed gates, and the opposite side shall be checked for leakage. The accepting criteria of the test results as well as the minimum duration of tests are the same as that of the gray iron gate valves.

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