Bellows Couplings BK
Metal Bellows Couplings for use in
Hazardous Areas and Explosive Atmosphere
Mounting,
Design:
For security reasons all misalignment
values torque ratings are decreased by 20%
Installation and Operation
instructions:
Installation and operating
instructions are an essential part
of the BK-EEx metal bellows couplings.
Including the following facts:
- Design of the BK EEx metal bellows couplings
- Exact tightening torques and misalignment
values - How to put in operation
- Maintenace intervals
- Trouble shooting
- Marking of the coupling
- Declaration of conformity
Identification:
All BK-EEx couplings are permanent labeled
to display manufacturer 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:
A place in which an explosive atmosphere consists of a mixture of air and flammable substances in the form of gas, vapor or mist, and is present frequently, continuously or for extended periods
Zone 20:
Is relevant for an explosive atmosphere in the form of clouds of combustible dust in air ander the same conditions as above.
Zone 1:
Described as a place in which an explosive atmosphere consists of a mixture of air and flammable substances in the form of gas, vapor or mist, and is likely to occur in normal operation occasionally.
Zone 21:
Is relevant for an explosive atmosphere in the form of clouds of combustible dust in air ander the same conditions as above.
Zone 2:
A Place in which an explosive atmosphere consists of mixture of air with flammable substances in the form of gas, vapor or mist is not likely to occur in normal operation but, if it does occur, it will persist for a short period only.
Zone 22:
Relevant for an explosive atmosphere in the form of a cloud of combustible dust in air ander the same conditions as above.
For the classified zones 1/21 and 2/22 the Servomax servo-insertcoupling do have an accreditation according to ATEX 95a
Assembling the BK-EEX Metal Bellows Couplings
All BK-EEX metall bellows couplings are designed that neither sparking
nor an
increasing in excess of the allowable temperature at
the surface can occur,
even while 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 materials only.
ATTENTION!
A monitoring of the driving- and driven face is required.
The shut off function has to take place immediately.
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