1)indicator employs anti-seismic structure.
2)Driven member powering indicator shall be impossible to be locked dead.
3)Drive shaft and driven shaft all employ the bearing support with flexible motion and without the possibility of being locked dead.
4)The contact of micro switch is generated from the rotational axis of supporting plate,therefore ,its reliability is high.
5)The lengths of lower supporting bearing surface of push plate and the header pipe of oil flow relay are equal.Therefore, the strength of shaft is enhanced.
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