Si-204
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Datasheet Butterfly valve Type VSS Wafer design Nominal pressure PN 50 Nominal size DN 80 - 600 Material Stainless steel triple • Advanceddesign eccentric • Designed for control and shut-off applications • Designed forup to applications 350° C (662 °F) • Tightness class in accordance with EN 60534-4 Class V as standard made • Solid seatsteel of stainless • Wafer design (Mounted between flanges) alt. lugged design • PTFE seat • HiNi seat SOMAS butterfly valve, type VSS PN 50, is a control, on/off and shut-off valve. The valve is designed to handle a wide range of liquids, gases and steam within a broad temperature range. The VSS PN50 valve can be mounted between flanges and also supplied in lugged design. The valves have an advanced triple eccentric design including a unique shape of the disc allows the use of a solid stainless steel seat. The solid seat remains unaffected by high flow velocities and temperatures. A good valve function is achieved even on difficult applications. The SOMAS valves are delivered ready for installation and operation. The valve assemblies are delivered factory tested as complete units with actuators, positioners and accessories. For nominal pressure PN 25, see type MTV in the datasheet Si-205 (DN 80-500) and type VSS in the data sheet Si-203 for remaining dimensions (section 2 of the SOMAS catalogue).

Tightness class Flow characteristics The tightness class is related to the chosen material in the seat ring. Metal seat Code C PTFE seat Code A EN 60534-4 VI (Option) (ASME B16-104 Class VI) Pressure and temperature rating Material: 2343 / CF8M Max. working pressure (bar) PN 50

Max. allowable pressure drops/torque figures Maximum allowable pressure drops are valid at 20° C (see below). Max. pressure drop. bar at opening angle

A = Face to face dimension according to EN 558 series 16 (valid for DN 100 - 600) øde = Necessary free diameter for the disc under movement

X = SC – Spring to close X = SO – Spring to open For units with the positioner type SP405, add 2 kg For units with the positioner type SPE405, add 3 kg For units with the positioner type SP405, add 2 kg For units with the positioner type SPE405, add 3 kg

Manual override Hand lever – – – – – – – – – –

Flange standard Seat design SOMAS butterfly valve type VSS PN 50 in this data sheet is of wafer type for mounting between flanges PN 25-50. The valves with a nominal size between DN 80-600 have a metal seat (3 pcs.) according to the code C. The valve can also be delivered in lugged design. Both types of valves can also be drilled for mounting between flanges according to ASME. When ordering, please state the pressure rating of the counter flanges. See valve specification system, code 11. PTFE and HiNi seat is available as an option. Also check the valve specification system (code 6) to find...

Temperature range State desired valve according to the valve specification system below as well as type of actuator, positioner and accessories. Seat A = PTFE (10% carbon) kol) C = 1.4462 E = 1.4547 G = SS 2562 (904L) L = HiNi (High Nickel alloy) T = HiCo (High Cobalt alloy) Shaft A = 1.4460 B = 1.4460, hard chromed hårdkrombelagd HiCo-belagd C = 1.4460, HiCo coated J = 1.4547 L = 1.4923, HiCo coated HiCo-belagd 1 Check with SOMAS for temperatures between 350 and 550° C. Valve specification system Bearing – valve body/shaft Wafer design 3 = HiCo (High Cobalt alloy) 2 Valve body design A =...