Kobelt 5028-A, Руководство владельца по эксплуатации, установке и техническому обслуживанию

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KOBELT MANUFACTURING CO. LTD mnl5028-A.docx (rev A) 14
4 O
PERATION
4.1 F
UNCTIONAL
R
EQUIREMENTS
4.1.1 Pressure Supply
It is necessary to size air compressors and storage tanks to provide sufficient air for the intended
duty of the brakes.
Except as noted below, Kobelt air applied caliper brakes utilize diaphragm type actuators and
therefore do not require lubrication.
The actuator diaphragms are not compatible with mineral oils. Do not
lubricate diaphragm actuators with mineral oil as damage to the diaphragm
will occur.
The main supply line to the brake system should be equipped with a filter, and regulator. The
filter’s function is to remove moisture and dirt in the system and the regulator will provide a
constant air pressure to the control system. If the brake system is operating in sub-zero
temperatures, it is recommended to have an air dryer in the system to remove all moisture.
Alternatively, a lubricator can be filled with methyl hydrate (wood alcohol) to prevent freezing
of the air system.
4.2 S
ERVICE
L
IMITS
4.2.1 Disc Temperature
The Kobelt brake lining achieves maximum friction at 300
o
F. Over 300
o
F the brake begins to
fade or experience diminishing friction. The maximum operating temperature of the brake
linings is 700
0
F [371
0
C]. Temperatures in excess of this limit will permanently damage the
linings and require replacement.
4.2.2 Ambient Temperature
In sub-zero temperatures, ventilated discs must be warmed up gently to avoid causing excessive
thermal stresses in the disc. Failure to do so could cause the disc to crack. Once the
temperature of the disc is out of freezing condition it can be used as normally intended.
Operating temperature of standard brake actuators is -40°C [-40°F] to 120°C [248°F]
4.2.3 Pressure
Do not allow the supply pressure to exceed the values given in the Technical Data section. If
the available supply pressure exceeds the maximum allowable working pressure, then some
form of a pressure regulator is required. Also, the pressure supply system must be equipped
with a safety relief valve to ensure the given maximum allowable working pressure.