Bellows Couplings BK
Metal Bellows Couplings for use in
Hazardous Areas and Explosive Atmosphere
Mounting,
Design:
For safety reasons, all misalignment values and torque ratings are decreased by 20%.
Installation and Operation Instructions:
Installation and operating instructions are included with every BK-EEx metal bellows coupling.
The following is highlighted in the manual:
- Design of the BK-EEx metal bellows couplings
- Exact tightening torques and misalignment values
- How to put the coupling into operation
- Maintenance intervals
- Troubleshooting
- Marking of the coupling
- Declaration of conformity
Identification:
All BK-EEx couplings are permanently labeled to display manufa cturer and accreditation data.
ATmosphere EXplosible
The ATEX 95a is regulated by the new European directive. Generally the explosive atmosphere is classified in 3 different zones.
Zone 0:
An explosive atmosphere consisting of a mixture of air and flammable substances in the form of gas, vapor, or mist that is continuously or frequently present.
Zone 20:
An explosive atmosphere in the form of clouds of combustible dust in the air under the same conditions listed above.
Zone 1:
An explosive atmosphere consisting of a mixture of air and flammable substances in the form of gas, vapor, or mist that will occasionally occur during normal operation.
Zone 21:
An explosive atmosphere in the form of clouds of combustible dust in the air under the same conditions listed above.
Zone 2:
An explosive atmosphere consisting of a mixture of air and flammable substances in the form of gas, vapor, or mist that is not likely to occur during normal operation, but could occur for short periods of time.
Zone 22:
An explosive atmosphere in the form of clouds of combustible dust in the air under the same conditions listed above.
For zones classified as 1/21 and 2/22, the Servomax servo-insert couplings are accredited according to ATEX 95a.
Assembling the BK-EEX Metal Bellows Couplings
AAll BK-EEx metal bellows couplings are designed so that neither sparking, nor an
increase in excess of the allowable temperature at the surface can occur,
even during malfunctions.
All dimensions of the standard models are retained. The coupling hubs are generally equipped with internal jaws for additional support of the bellows. If the bellows were to tear or break, the internal jaws would eliminate the risk of sparking or heating and continue to drive the load. In case of damage, the angle of turn between the driving and the driven side is ± 4° degrees. All hubs are made of steel or stainless steel.
ATTENTION!
The drive and driven elements should be monitored closely.
The shut off function has to take place immediately if a failure occurs..
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