SOMAS MTV - Setting of the Closed Position on the Butterfly Valve; Setting of the Open Position on the Butterfly Valve

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Original document - Mi-205 EN Edition: 2021-04
6.8.1 Setting of the “closed” position on the butterfly valve type MTV/FSV
1. Operate the valve to test.
2. Check if the butterfly touches the seat in the closed position.
3. The adjustment is correct if the butterfly touches the seat.
Procedure
1. If the butterfly does not touch the seat, loosen the lock nut of the end position
bolt (
➔ Fig.6-9/2) and turn the end position bolt 1-2 turns counterclockwise.
2. If the contact pressure of the butterfly onto the seat is too high loosen the lock
nut of the end position bolt and turn the end position bolt (
➔ Fig.6-9/2) 1-2 turns
clockwise.
3. Operate the valve to test.
4. When the set-up is correct, thighten the lock nut on the actuator.
5. The butterfly valve should undergo a leakage test subsequently (
➔ Chap. 6.9).
6.8.2 Setting of the “open” position on the butterfly valve type MTV/FSV
1. Operate the valve to test.
2. Check if the valve opens to the desired position (about 80°).
In case of shut off/on application the max. opening angle of the butterfly valve is
about 80°.
Procedure
1. If the butterfly does not reach the position, loosen the lock nut of the
end position bolt and turn the end position bolt (
➔ Fig.6-9/1) 1-2 turns
counterclockwise.
2. If the butterfly rides over the position, loosen the lock nut of the end position
bolt and turn the end position bolt (
➔ Fig.6-9/1) 1-2 turns clockwise.
3. Operate the valve to test.
4. When the correct setting is reached, tighten the locknut.