Spirax Sarco M10S Three-Piece Ball Valve, DN1/4 to DN2-1/2

A serviceable isolating ball valve for steam, gas and liquids

The Spirax Sarco M10S is a three-piece body ball valve designed as an isolating valve, not as a control valve. Screwed and welded versions can be serviced without removal from the pipeline. It can be used with the majority of industrial fluids from vacuum to higher temperatures and pressures, and the PN100 body is rated for a maximum operating pressure of 17.5 bar g on saturated steam.

Three body types are available: the M10S2 in zinc-plated carbon steel, the M10S3 in stainless steel body and cap with other parts as listed, and the M10S4 in complete stainless steel. Each is supplied in full bore (FB) or reduced bore (RB), and all use carbon/graphite reinforced PTFE (PDR 0.8) seats.

Technical specifications

Connections, standards and construction

Full bore valves come in ¼ to 2 in (DN15 to DN50) and reduced bore in ½ to 2-1/2 in (DN15 to DN65). Screwed and welded ends are BSP (BS 21 Rp or ISO 228 G), BSPT (Rc), NPT, butt weld Sch 40/40S and socket weld, and flanged ends are ASME Class 150, Class 300 and EN 1092 PN40. The design follows ASME B16.34, ASME B16.10 (with listed exceptions) and EN 558; leakage tests follow ISO 5208 Rate A and EN 12266-1 Rate A, and the antistatic device complies with ISO 7121 and BS 5351. The flow characteristic is modified linear.

The M10S2 body and cap are ASTM A105 zinc plated carbon steel, the M10S3 and M10S4 body and cap are ASTM A182 F316L, and the ball and stem are AISI 316 in all types. The stem seal is reinforced antistatic PTFE. Certification to EN 10204 2.2 or 3.1 is available when stated at order.

Pressure and temperature limits

The body design condition is PN100: maximum allowable pressure 100 bar g at 60 °C, maximum allowable temperature 260 °C at 0 bar g and minimum -29 °C. The datasheet chart gives separate limits for screwed and welded ¼ to 1-1/2 in valves and 2 in reduced bore, for 2 in full bore and 2-1/2 in reduced bore (which have a PTFE gasket between body and cap), and for each flange standard, and the flange standard can restrict the maximum operating pressure further. In gas applications the maximum operating pressure is restricted to 40 bar g.

For saturated steam the datasheet limit is 17.5 bar g on the steam saturation curve. As a general rule an isolating ball valve should be fully open or fully closed and never used to throttle flow. Related products are listed under Fittings & Valves.

How the Spirax Sarco M10S works

A ball with a bore through it sits between two seats inside the body. Turning the lever rotates the ball a quarter turn. With the bore in line with the pipe the valve is open, and with the bore across the pipe the valve is closed. The seats seal against the ball to hold the fluid back.

Where the M10S is used

• Steam isolation
• Gas isolation
• Liquid isolation
• Lines that must be serviced in place
• General industrial pipework

Selection checklist for the M10S

• Fluid
• Operating pressure
• Operating temperature
• Line size
• Full bore or reduced bore
• Body material
• End connection type
• Certificate needs

Installation, commissioning and maintenance notes for the M10S

Fit the valve with the lever clear of obstructions and with room to turn it. Use it as an isolating valve and not for throttling. Operate it fully open or fully closed. Because the body is three-piece, the centre section can be serviced without lifting the valve from the line on the screwed and welded versions.

Requesting a quotation for the Spirax Sarco M10S

Please send the fluid, the pressure, the temperature, the size and the end connection. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

M10S valve type

It is a three-piece body ball valve.

M10S duty

It is designed as an isolating valve and not as a control valve.

M10S serviceability

Screwed and welded versions can be serviced without removal from the pipeline.

M10S fluids

It can be used with the majority of industrial fluids from vacuum to higher temperatures and pressures.

M10S steam rating

The PN100 body is rated for a maximum operating pressure of 17.5 bar g on saturated steam.

M10S body types

Three body types are offered, the M10S2, the M10S3 and the M10S4.

M10S2 body

The M10S2 is made of zinc-plated carbon steel.

M10S3 body

The M10S3 has a stainless steel body and cap.

M10S4 body

The M10S4 is made completely of stainless steel.

M10S bore options

Each body type is supplied in full bore or reduced bore.

M10S seats

All versions use carbon and graphite reinforced PTFE seats.

M10S full bore sizes

Full bore sizes run from 1/4 inch to 2 inch, or DN15 to DN50.

M10S reduced bore sizes

Reduced bore sizes run from 1/2 inch to 2-1/2 inch, or DN15 to DN65.

M10S end connections

Ends can be screwed, butt weld, socket weld or flanged.

M10S ball and stem

The ball and stem are made of stainless steel.

M10S stem seal

The stem seal is reinforced PTFE and antistatic.

M10S design pressure

The body design is PN100, which is 100 bar g at 60 degrees C.

M10S temperature range

The allowable temperature runs from minus 29 to 260 degrees C.

M10S test pressure

The cold hydraulic test pressure is 150 bar g.

M10S certificates

Material certificates can be supplied on request, so state the requirement when ordering.

Valve records for the M10S

Record the body type, the bore, the size and the line where each valve is fitted.

Choosing the right M10S body

Choose the body material from the fluid, the temperature and the corrosion risk on the line.

Documents and quotation

The technical information sheet TI-P133-06 is attached, with dimensions and weights for every connection type. Please state the size, bore (FB or RB), body type (M10S2, S3 or S4), end connection and standard, medium, pressure and temperature, and any certification required when requesting a quotation.