Butterfly valves: MTV and MTVF
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Datasheet Butterfly valve Type MTV Wafer design Type MTVF Flanged design Type MTVL Lugged design Nominal pressure PN 10 - 25 Nominal size DN 80 - 500 Material Stainless steel triple • Advanceddesign eccentric • Designed for control and shut-off applications • 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 • High temperature applications up to 550° C (1022 °F) SOMAS butterfly valves, type MTV, MTVF and MTVL, are control, on/off and shut-off valves. These valves are designed to handle a wide range of liquids, gases and steam within a broad temperature range. The MTV valve can be mounted between flanges and also supplied in lugged design. The valve type MTVF is a full flanged butterfly valve. 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 un-affected 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.

Tightness class The tightness class is related to the chosen material in the seat ring. Metal seat Code D PTFE seat Code A EN 60534-4 VI (ASME B16-104 Class VI) (Option) Pressure and temperature rating Pressure Bar, gauge 25 Factor Flp is valid for all sizes Factor Fl is valid for all sizes Pipe geometry factor FP Use a shaft in accordance with code A for temperatures up to 150° C. Use a shaft in accordance with code B for acids and hot gases above 150° C. Flow characteristics 100% Flow

Lugged design A = Face to face dimension according to EN 558 series 20 øde = Necessary free diameter for the disc under movement CC

Wafer design Lugged design 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

Flanged design øD According to the flange standard A = Face to face dimension according to EN 558 series 13 øde = Necessary free diameter for the disc under movement Approximate value dependent on PN-class Approximate value dependent on PN-class Approximate value dependent on PN-class 5

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 1 Approximate value dependent on PN-class For units with the positioner type SP405, add 2 kg For units with the positioner type SPE405, add 3 kg Manual override

Flange standard Further technical information SOMAS butterfly valve type MTV in this data sheet is of wafer type for mounting between flanges PN10 - 25. Technical data for the materials used in the SOMAS valves, flange standard, steam data, etc. can be found in section 6 of the SOMAS catalogue. The valve can also be delivered in lugged design, MTVL. Data sheet Si-203 shows butterfly valve type VSS for nominal sizes above DN500. The butterfly valve type MTVF is equipped with flanges which can be drilled for PN10 - 25. Both types of valve can also be drilled for mounting be­ ween flanges...

Temperature range The standard MTV valve is designed to be mounted between flanges, but is also available in lugged design. Seat A = PTFE (10 % carbon) D = 1.4470 (metal seat type Y) E = 1.4547 P = PTFE (fibreglass 15 %) N = 1.4835 (253MA) F = 1.4435 G = 1.4435 (316L), hard chromed K = 1.4539 T = Titanium B = 1.4460, hard chromed C = 1.4460, HiCo coated MTVF Flanged design MTVL Lugged design Ordering State desired valve according to the valve specification system below as well as type of actuator, positioner and accessories. 1 Check with SOMAS for temperatures between 350 and 550° C. At...