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Original document - Mi-205 EN Edition: 2021-04
3 Description
3.1 General information
The SOMAS butterfly valve is used for control shut-off and hand operation. The
valve is suitable for liquids, vapours and gases in a wide temperature range.
Due to the sophisticated triple-eccentric design and the special shape of the disc
a solid stainless steel seat can be used. This combination gives a solution resistant
against high flow velocity and guarantees no leakage even under severe conditions.
The seat is available in different stainless qualities and is replaceable.
The butterfly valve is designed as a wafer style valve. As alternative there is a lug
type version available.
The butterfly valve is checked and ready for use at delivery and can be equipped
with actuators, valve positioners as well as with other accessories.
3.2 Function of the valve
Fig.3-1 MTV Fig.3-2 FSV
MTV
Metal seat Code D
Control valve: EN60534-4 V Shut-off valve: EN12266-1 Rate D
PTFE seat Code A
Control valve: EN60534-4 V Shut-off valve: EN12266-1 Rate C
Control valve: EN60534-4 VI
(optional)
Shut-off valve: EN12266-1 Rate B
(optional)
FSV
Fire safe Code F
Control valve: EN60534-4 V Control valve: EN60534-4 VI
(optional)
Shut-off valve: EN12266-1 Rate B
(optional)
Shut-off valve: EN12266-1 Rate C
(optional)
The SOMAS MTV valve is equipped with a metalic seat.
The tightness on the main flow direction is according to:
The SOMAS FSV valve is equipped with a Fire safe seat.
The tightness on the main flow direction is according to:
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