Zero Backlash Couplings - DieQua Corporation

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Shaft Couplings For Use In Hazardous Areas & Explosion Proof Applications

ATEX Certification Information:

Engineering Note:
For safety and security reasons all misalignment values and torque ratings are decreased by 20%.

Series EK: For the classified zones 1/21 and 2/22 the Servomax elastomer insert coupling series EK, with Type D insert, has accreditation according to ATEX 95a.

Series BK-EEX: Optional designs are available to satisfy ATEX requirements.

Installation and operating instructions are an essential part, including the following facts:

  • Design of the BK-EEX metal bellows or EK elastomer series couplings

  • Exact tightening torques and misalignment values

  • How to put in operation

  • Maintenance intervals

  • Marking of the coupling

  • Declaration of conformity

Identification:
All couplings are permanently labeled to display manufacturer and accreditation data.

Explosive Atmospheres:
The ATEX 95/ATEX 137 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 consisting of a mixture of air and flammable substances in the form of gas, vapor or mist is present frequently, continuously or for longer periods

Zone 20:
Is relevant for an explosive atmosphere in the form of clouds of combustible dust in air, under the same conditions as above.

Zone 1:
Described as a place in which an explosive atmosphere existing of a mixture of air and flammable substances in the form of gas, vapor or mist is likely to occasionally occur in normal operation.

Zone 21:
Is relevant for an explosive atmosphere in the form of clouds of combustible dust in air, under the same conditions as above.

Zone 2:
A place in which an explosive atmosphere consisting of a mixture with air or 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, under the same conditions as above.

Design of the BK-EEX metal bellows couplings:

All 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 materials only.

ATTENTION!
Monitoring the driving and driven shafts is required. The shut off function has to take place immediately.

     

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Bloomingdale, IL 60108-3105
Phone: 630-980-1133 Fax: 630-980-1232

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