The Spirax Sarco M10Vi ISO three-piece ball valve is designed for isolating steam and other industrial fluids. It is available in full-bore and reduced-bore options, with a galvanized carbon steel or stainless steel body and pure PTFE seats. It provides zero-leakage performance to ISO 5208 Rate A. Connection options include threaded, butt-weld, socket-weld and flanged ends. The maximum allowable pressure is 70 bar g, and the maximum operating pressure for saturated steam is 10 bar g. The valve is suitable for isolating steam and fluid systems where a high sealing standard and antistatic protection are required.
M10Vi ISO 3-Piece Ball Valve, Three-Quarter View | Spirax Sarco
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M10Vi ISO Three-Piece Ball Valve | Spirax Sarco
Three-piece ball valve for steam and industrial fluid isolation, available in full-bore and reduced-bore options.
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Specifications
- Valve type
- 3-piece ball valve, for isolation only
- Suitable media
- Steam and other industrial fluids
- Bore type
- Full bore or reduced bore
- Connection type
- BSP, BSPT, API/NPT threaded; BW butt weld; SW socket weld; flanged
- Flange pressure rating
- ASME (ANSI) Class 150, ASME (ANSI) Class 300, EN 1092 PN40
- Full-bore sizes
- 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2"
- Reduced-bore sizes
- 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2"
- Maximum allowable pressure
- 70 bar g @ 40°C
- Maximum allowable temperature
- 230°C @ 0 bar g
- Maximum operating pressure for saturated steam
- 10 bar g
- Maximum operating temperature
- 232°C @ 0 bar g
- Minimum operating temperature
- -29°C
- Design cold hydraulic test pressure
- 105 bar g
- Leakage class
- ISO 5208 Class A / EN 12266-1 Class A
- Antistatic standard
- Complies with ISO 7121 and BS 5351
- Body material
- Galvanized carbon steel ASTM A105 or stainless steel ASTM A182 F316L
- Ball and stem material
- Stainless steel AISI 316
- Seat material
- Virgin PTFE
- Stem seal material
- Antistatic reinforced PTFE and PEEK
- Product certificate
- EN 10204 3.1
Selection points
In-line maintenance for threaded and welded versions
The 3-piece design allows direct maintenance. Threaded and welded versions can be serviced without removing the valve from the pipeline.
Integral ISO mounting for automation
The integral ISO mounting design allows the valve to be automated without dismantling the valve body, helping preserve seal integrity.
Full- or reduced-bore options
Available with either a full or reduced bore to suit the required pipeline flow area.
Antistatic stem seal materials
The stem seal is made from antistatic reinforced PTFE and PEEK.
Installation & maintenance notes
For isolation service only
The M10Vi ISO is for on/off isolation only and must not be used for throttling or flow control.
Threaded and welded versions support in-line maintenance
Threaded and welded versions can be serviced without removing the valve from the pipeline.
FAQ
Can the M10Vi ISO ball valve be used to regulate steam flow?
No. The M10Vi ISO is designed as an isolation valve for industrial fluids. It is suitable for on/off isolation of steam and other industrial fluids, but should not be used as a control valve for continuous flow regulation.
How should I choose between a full-bore and reduced-bore M10Vi ISO?
Choose based on the pipeline size, required flow capacity, and connection type. Full-bore versions typically have a higher Kv value and are suitable for isolation applications requiring greater flow capacity. Reduced-bore versions are available in sizes up to 2½ inches. Confirm the specific configuration against the model and application requirements.
How do the M10Vi2, M10Vi3, and M10Vi4 ISO differ in body material?
The M10Vi2 ISO has a galvanized carbon steel body and bonnet; the M10Vi3 ISO has a stainless steel body and bonnet; and the M10Vi4 ISO features an all-stainless-steel construction. All three models use PTFE seats. Select the appropriate model based on the media and site operating conditions.
Can an actuator be fitted to the M10Vi ISO for automation?
Yes. The valve features an integral ISO mounting design, allowing it to be configured for automation without dismantling the valve body. This helps preserve seal integrity and enables manual or remote operation. Select the actuator based on the valve size, bore type, and actual operating torque requirements.
How is the M10Vi ISO serviced and how are spare parts replaced after installation?
Threaded and welded versions can be serviced directly without removing the valve from the pipeline. Available spares include the seat, stem, and body seal set, which contains the seat, stem seals, and body/bonnet sealing components. Follow the installation and maintenance instructions supplied with the valve. When ordering spares, specify the valve size and full model designation.