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Care of Rotary Valves

Application of the Miraphone spindle bearing lubricant

Oil the lever support shaft (15), the ball bearings (16) of the Miraphone-Minibal linkage rod and also the valve bearing pins (16A and 10A) with the Miraphone spindle bearing lubricant. Dry links could be wear very fast.

Miraphone spindle bearing lubricant

Rotary valve system Ventillager Ventillager


Lubricating rotary valves on the bearing pin (no ATV-System)

Lubricate the valve bearings on the upper bearing pin (10A) under the stop arm and the lower bearing pin (10A) by removing the botton valve cap (11).

Caution: Be careful not to use too much oil. Excessive oil could leak into the valve casing slowing the action and causing valves to become sluggish.

Valve cap


Lubricating ATV-valves on the bearing pin

Lubricate the valve bearings by applying oil first to the upper bearing pin (6) and then to the lower bearing pin by removing the bottom valve cap (11).

Ventilhals und Schraubdeckel

Removal and replacement of ATV-valves

In order to remove the inner valve casing (7) from the outer valve casing (9), first remove the Minibal screw (2) from the stop arm (3) using the Torx screw driver. Hold tightly onto the Minibal linkage when turning the screw since the valve is under tension due to the trigger spring.

Remove the lower screw cap (11).
Hold the valve (5) from above and push it out through the top.
Rinse the valve (5) with lukewarm water and clean the valve casing (9) with a non-abrasive cleaning cloth (D). Apply a thin film of grease (Selmer Tuning Slide Grease) on the valve casing (9). It is best to rub the thin layer of grease on with your fingers.

Take care that the grease does not get into the valve during removal and replacement.
Simple and precise re-fitting of the valve casing is ensured by the adjusting pin (8).
Now screw the lower valve cap (11) onto the outer valve casing (9) and insert the Minibal screw (2) through the Minibal-linkage (4) back into the stop arm (3).

Valves and casings (9) are important components of the instrument; take care that you go slow in order to prevent damage to them.

Ventilbüchse ATV Ventile