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Spirax Sarco
Spirax Sarco
PN100PED CertifiedISO 5208 Grade AEN10204 3.1 Available

Spirax Sarco M10S/M10S2RB Three-Piece Ball Valve

Spirax Sarco M10S/M10S2RB three-piece ball valve, for isolation (not for throttling), PN100 design condition, suitable for steam and industrial fluids, from vacuum to high temperature and high pressure. Available in carbon steel and stainless steel, with full bore and reduced bore options, supporting threaded, welded, and flanged connections.

Isolation ValvesBall Valves
Spirax Sarco M10S Three-Piece Ball Valve

Product Overview ​

Spirax Sarco M10S/M10S2RB three-piece ball valve, for isolation use, not suitable for throttling. Suitable for steam and other industrial fluids, from vacuum to higher temperatures and pressures. The M10S can be maintained in-line without removing from the pipe (screwed and weld-ended types only).

Product Features

  • Three-piece design for easy in-line maintenance
  • Multiple body material options: zinc-coated carbon steel, stainless steel, full stainless steel
  • Full bore (FB) and reduced bore (RB) options available
  • Multiple connection types: BSP, BSPT, API/NPT, BW (butt weld), SW (socket weld)
  • Conforms to European Pressure Equipment Directive 97/23/EC
  • EN 10204 3.1 certificate available upon request
  • Anti-static design, complies with ISO 7121 and BS 5351
  • Self-venting ball option available

Sizes and Pipe Connections ​

Full Bore (FB) ​

SizeConnection Types
1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2"Screwed, Welded (BSP, BSPT, API/NPT, BW, SW)

Reduced Bore (RB) ​

SizeConnection Types
1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2"Screwed, Welded (BSP, BSPT, API/NPT, BW, SW)

Flanged Connections ​

Bore TypeSize RangeFlange Standards
Full BoreDN15 - DN50ASME (ANSI) Class 150/300, EN 1092 PN40
Reduced BoreDN15 - DN65ASME (ANSI) Class 150/300, EN 1092 PN40

Pressure/Temperature Limits ​

Spirax Sarco M10S/M10S2RB Pressure Temperature Limits

ParameterValue
PMA Maximum Allowable Pressure100 bar g @ 60°C
TMA Maximum Allowable Temperature260°C @ 0 bar g
Minimum Allowable Temperature-29°C
PMO Maximum Operating Pressure (Saturated Steam)17.5 bar g
TMO Maximum Operating Temperature260°C @ 0 bar g
Minimum Operating Temperature-29°C
Design Maximum Cold Hydrostatic Test Pressure150 bar g

Note

This product cannot be used in certain pressure/temperature combination regions. Please refer to the pressure-temperature curve for details. For temperatures below the minimum operating temperature, please consult Spirax Sarco.

Materials ​

Spirax Sarco M10S/M10S2RB Materials

No.PartM10S2 (Carbon Steel)M10S3 (Stainless Steel)M10S4 (Full Stainless Steel)
1BodyZinc-coated carbon steel ASTM A 105Stainless steel ASTM A 182F 316LStainless steel ASTM A 182F 316L
2BonnetZinc-coated carbon steel ASTM A 105Stainless steel ASTM A 182F 316LStainless steel ASTM A 182F 316L
3BallStainless steel AISI 316Stainless steel AISI 316Stainless steel AISI 316
4StemStainless steel AISI 316Stainless steel AISI 316Stainless steel AISI 316
5SeatCarbon/Graphite reinforced PTFE PDR 0.8Carbon/Graphite reinforced PTFE PDR 0.8Carbon/Graphite reinforced PTFE PDR 0.8
6Stem SealAnti-static reinforced PTFEAnti-static reinforced PTFEAnti-static reinforced PTFE
7SeparatorZinc-coated carbon steel SAE 1010Stainless steel AISI 316Stainless steel AISI 316
8Belleville WasherStainless steel AISI 301Stainless steel AISI 301Stainless steel AISI 301
9NutZinc-coated carbon steel SAE 12L14Stainless steel AISI 304Stainless steel AISI 304
10Nameplate (DIN)Stainless steel AISI 430Stainless steel AISI 430Stainless steel AISI 430
11Stem NutZinc-coated carbon steel SAE 12L14Stainless steel AISI 304Stainless steel AISI 304
12LeverZinc-coated carbon steel SAE 1010Stainless steel AISI 316Stainless steel AISI 316
13NameplateStainless steel AISI 430Stainless steel AISI 430Stainless steel AISI 430
14HandleVinylVinylVinyl

Dimensions and Weights ​

Spirax Sarco M10S/M10S2RB Dimensions

Reduced Bore Dimensions (mm) ​

SizeAA1A2A3A4BB1CC1DD1D2D3E
1/4"6360---120---24---11
3/8"6363---120-61-24---11
1/2"635110813014012012061872489959511
3/4"68591171501521201206389269810511714
1"868412716016515715791913110811512421
1-1/4"979314018017815715795953711814013325
1-1/2"1061021652001901801801091094112715015631
2"1241181782302161801801151154815216516538
2-1/2"152152191-241245-13213257--19051

Full Bore Dimensions (mm) ​

SizeAA1A2A3A4BB1CC1DD1D2D3E
1/4"6360---120-61-24---8
3/8"6363---120-61-24---11
1/2"6868-130140120120638926-959514
3/4"8686-150152157157919131-10511721
1"9797-160165157157959537-11512425
1-1/4"106106-18017818018010910941-14013331
1-1/2"124124-20019018018011511548-15015638
2"152152-23021624524513213257-16516551

Weights (kg) ​

SizeRB ScrewedRB Butt WeldRB Socket WeldRB PN40RB ASME 150RB ASME 300FB ScrewedFB Butt WeldFB Socket WeldFB PN40FB ASME 300
1/4"0.5---0.61--0.5---
3/8"0.61---0.61--0.61---
1/2"0.612.21.652.2--0.702.3-2.5-
3/4"0.702.92.202.9--1.273.5-4.2-
1"1.273.93.384.5--1.774.4-5.1-
1-1/4"1.775.44.447.0--2.506.2-7.5-
1-1/2"2.506.55.848.36--3.507.5-10.0-
2"3.508.88.9911.2--6.9012.2-13.4-
2-1/2"6.90--17.5-------

Flow Characteristics (Kv Values) ​

SizeReduced Bore KvFull Bore Kv
1/4"33
3/8"6.86.8
1/2"617
3/4"1036
1"2758
1-1/4"4989
1-1/2"70153
2"103205
2-1/2"168-

Conversion formulas: Cv(UK) = Kv × 0.963, Cv(US) = Kv × 1.156

Operating Torque (Nm) ​

SizeReduced BoreFull Bore
1/4"22
3/8"22
1/2"3.53.5
3/4"3.513
1"1321
1-1/4"2130
1-1/2"3040
2"4045
2-1/2"45-

Torque Note

The above torques apply to frequently operated valves with maximum differential pressure of 100 bar. For valves in fixed positions for long periods, torque may increase.

Spare Parts ​

Spirax Sarco M10S/M10S2RB Spare Parts

Available Spare Parts ​

Spare Part NamePart Numbers
Seat and Stem Seal Set5, 6

Ordering Spare Parts

When ordering spare parts, please specify the valve size and model.

Example: Seat and Stem Seal Set for 1/2" M10S2FB ball valve.

Optional Accessories ​

  • Self-venting ball: Reduces air accumulation inside the valve
  • Extended stem: Available in 50mm (2") and 100mm (4") options, ensures complete insulation, suitable for insulated piping systems
  • Lockable handle: Provides safety locking function to prevent misoperation
  • Oval handle: Suitable for limited space, especially for steam trap station installation

Installation and Maintenance ​

For detailed installation and maintenance instructions, please refer to the installation and maintenance manual provided with the product.

In-line Maintenance

The M10S can be maintained in-line without removing from the pipe. This feature applies to threaded and weld-ended types only. For flanged types, the valve body must be removed from the pipeline for maintenance.

Ordering Information ​

Example: 1 - Spirax Sarco 1/2" Screwed Connection BSP M10S2FB Ball Valve

When ordering, please specify:

  1. Size and connection type
  2. Model (M10S2, M10S3 or M10S4)
  3. Bore type (FB full bore, RB reduced bore)
  4. Material certificate requirements (if EN 10204 3.1 certificate required)

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