Spirax Sarco M10Si is an ISO three-piece steam isolation ball valve, available in full-bore and reduced-bore configurations with threaded, butt-weld, socket-weld, and flanged connections. The valve body is available in galvanized carbon steel or 316L stainless steel, with a maximum operating pressure of 17.5 bar g for saturated steam. It is suitable for on/off isolation, in-line maintenance, and automated remote switching in industrial steam and other fluid piping systems.
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Spirax Sarco M10Si ISO Three-Piece Steam Isolation Ball Valve (DN 1/4" to DN2 1/2")
Three-piece steam isolation ball valve supporting in-line maintenance and ISO automation mounting.
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After-sales support
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Specifications
- Valve type
- Three-piece ball valve (isolation valve)
- Bore type
- Full bore (FB) and reduced bore (RB)
- Connection size range
- 1/4" to 2-1/2" (RB), 1/4" to 2" (FB)
- Connection type
- Threaded BSP/BSPT/API/NPT, butt weld BW, socket weld SW, flanged
- Flange standards
- EN 1092 PN40, ASME Class 150, ASME Class 300
- Maximum allowable pressure PMA
- 100 bar g@60°C
- Maximum allowable temperature TMA
- 260°C@0 bar g
- Minimum allowable temperature
- -29°C
- Maximum operating pressure for saturated steam PMO
- 17.5 bar g
- Maximum cold hydraulic test pressure
- 150 bar g
- Maximum differential pressure
- Limited by PMO
- Leakage rate class
- ISO 5208 Class A / EN 12266-1 Class A
- Flow characteristic
- Modified linear
- Body material
- Zinc-plated carbon steel ASTM A105 / stainless steel ASTM A182 F 316L
- Ball material
- Stainless steel AISI 316
- Seat seal material
- Carbon/graphite reinforced PTFE (PDR 0.8)
- Kv range
- Reduced bore 2.5-168, full bore 2.5-205
- Operating torque range
- 3.25 to 75 Nm (maximum differential pressure 40 bar)
- Anti-static design
- Compliant with ISO 7121 and BS 5351
- Certification
- Pressure Equipment Directive 97/23/EC (CE), EN 10204 3.1
Application scenarios
Industrial steam line isolation
Used for start-up, shut-off, and isolation on industrial steam mains, branch lines, or upstream and downstream of steam-using equipment. This valve is a three-piece isolation ball valve specifically suitable for steam, with a maximum operating pressure for saturated steam of 17.5 bar g.
In-line maintenance of threaded or welded industrial piping
Used on threaded or welded industrial fluid lines requiring maintenance. Product documentation states that these connection types can be serviced directly without removing the valve body from the pipeline.
Automated remote switching of industrial fluid lines
Used for remote on/off operation and automated control of industrial fluid lines. Product documentation states that the ISO mounting configuration enables valve automation without removing the valve body or compromising seal integrity, while supporting manual or remote control.
Isolation of vacuum and industrial fluid process lines
Used for sectional isolation in vacuum service and other industrial fluid process lines. Product documentation states that this valve is suitable for steam and other industrial fluids from vacuum conditions to elevated temperatures and pressures, and is intended for isolation service.
Selection points
ISO Mounting Supports Future Automation
The integrated ISO valve body mounting supports valve automation, enabling manual or remote control without removing the valve body while maintaining sealing integrity.
Carbon/Graphite-Reinforced PTFE Seats for Steam Isolation
This series uses carbon/graphite-reinforced PTFE (PDR 0.8) seats and is designed as a steam isolation ball valve.
Three-Piece Ball Valve Design
This product features a three-piece ball valve isolation valve design.
Full-Bore and Reduced-Bore Configurations
This series is available in full-bore and reduced-bore versions. Full-bore sizes range from 1/4 in. to 2 in., while reduced-bore sizes range from 1/4 in. to 2-1/2 in.; the corresponding maximum Kv values are 205 and 168, respectively.
Multiple Pipeline Connection Options
This series is available with BSP/BSPT/API/NPT threaded, butt-weld, socket-weld, and flanged connections. Flange standards include EN 1092 PN40, ASME Class 150, and ASME Class 300.
Installation & maintenance notes
Remove Internal Valve Seals Before Welding Connections
For butt-weld or socket-weld connections, remove the internal valve seals before welding to prevent welding heat from damaging the PDR 0.8 seats and associated sealing components.
FAQ
What is the operating principle and application of the M10Si ISO ball valve?
The M10Si ISO ball valve is a three-piece isolation ball valve for steam and other industrial fluids, suitable for use from vacuum to high-temperature and high-pressure conditions. It is intended as an isolation valve rather than a control valve.
What are the key selection considerations for the M10Si ISO compared with standard ball valves?
Consider whether a full bore or reduced bore is required, material selection (zinc-plated carbon steel, stainless steel, or all-stainless steel), connection type (threaded, welded, flanged, etc.), whether a lockable handle is required, and whether certificates and temperature/pressure limits meet the application conditions. Specific configurations should be confirmed according to the actual model and operating conditions.
How can automation be integrated when installing an ISO ball valve without compromising sealing?
The valve body design allows valve automation to be implemented during installation without removing the valve body, while maintaining seal integrity. It also supports safe integration of manual and remote control.
How are the sealing and leakage performance of this valve series ensured?
The leakage rate complies with ISO 5208 Class A/EN12266-1 Class A and features an anti-static design compliant with relevant standards. During selection, confirm the required leakage class and operating environment.
How should port and connection specification markings be interpreted during selection?
FB denotes full bore, while RB denotes reduced bore. The size range covers 1/4" to 2" threaded/welded/flanged connections, with flange dimensions compliant with standards such as ASME EN 1092 PN40. Confirm the specific model according to the nominal size and connection type.