M10S Three-piece Ball Valve

Spirax Sarco M10S product scope and connections

The M10S has a three-piece body, PDR 0.8 carbon/graphite-reinforced PTFE seats, and AISI 316 ball and stem components. It is available in full-bore and reduced-bore versions. Leakage testing is to ISO 5208 Rate A / EN 12266-1 Rate A, and the anti-static device complies with ISO 7121 and BS 5351.

The product is documented against the EU Pressure Equipment Directive and UK Pressure Equipment (Safety) Regulations, and is designed according to ASME B16.34, ASME B16.10 for applicable ASME flanged versions, and EN 558. EN 10204 2.2 and 3.1 certification is available when specified at order placement.

M10S operating limits

Operating pressure is limited by the applicable pressure-temperature envelope and may be further restricted by the flange standard. Use the selected connection, port and service medium when confirming the final duty.

Selected construction materials

Flow and operating data

For conversion, Cv (UK) = Kv x 0.963 and Cv (US) = Kv x 1.156. The published torque values apply to frequent operation at a 100 bar maximum differential pressure; torque can increase when a valve remains in a fixed position for a long period.

M10S installation, options and service

Confirm size, pressure rating, construction materials and end connection against the actual duty before installation. Avoid pipe misalignment, fit upstream strainers and filters where abrasive particles could damage the seats, and allow access for operation and maintenance. In steam service, fit a trapped drain pocket upstream and open the valve slowly to reduce waterhammer risk.

Only socket-weld and butt-weld connection versions may be welded. They must be dismantled before welding, with each end welded separately and the valve reassembled only after the ends have cooled. Do not weld threaded or flanged carbon-steel versions.