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DMN-WESTINGHOUSE Explosion-Proof Rotary Valves
Code: RV-Ex.pro-E.B.01.D 05-2016
16
Does the following information on the nameplate of the gear unit
corresponds to the potentially explosive on-site atmosphere.
Pay specific attention to:
Unit group
Explosion-proof category
Dust- Gas area
Temperature class
Maximum surface temperature
Chain drive
- On one side of the valve holes have been tapped for fitting the motor base plate
(see drawing for dimensions).
- To fasten the chain guard, three holes have been tapped in the bearing housing
of the valve (see drawing for dimensions).
The chain drive must be protected by a guard.
When assembling the chain guard make sure that no ignition
sources (e.g. sparks through contact) can be created.
Check if there are any potentially explosive atmosphere, oils,
acids, gases, vapours, radiation etc. present during installation.
Please follow safety instructions of chapter 1 when installing the
Rotary valve in a potentially explosive atmosphere.
Chain guard
Zone
Marking
Chain guard
1-21
II 2GD
Brass chain guard
with chain tensioner.
2-22
II 3GD
Standard mild steel Chain guard
STOP
The sprockets should be fitted on the rotor shaft as close as possible
to the bearing housing.
The sprockets should not be hammered on to the shafts.
The sprockets on the shafts of the valve and the gear unit should
always be perfectly aligned.

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