Nexen STC600 927270 - Manual (Page 6)

6 FORM NO. L-20294-E-1209
AIR CONNECTIONS
NOTE
For quick response, Nexen recommends a quick
exhaust valve and short air lines between the
Control Valves and the product. Align the air inlet
ports to a down position to allow condensation to
drain out of the air chambers of the product.
CAUTION
Low air pressure will cause slippage and
overheating. Excessive air pressure will
cause abrupt starts and stops, reducing
product life.
All Nexen pneumatically actuated devices require clean
and dry air, which meet or exceeds ISO 8573.1:2001
Class 4.4.3 quality. The following is a common air supply scheme used with
this product. This is an example and not an all-inclusive
list. All air circuits to be used with this product must be
designed following EN983 guidelines.
AIR LINE CONNECTIONS
Nexen STCs have six air ports. All six air ports accept
1/8'' NPT fittings. Air line connections to the STC can be
made in two ways.
The first method requires three air sources and allows the
operator to interrupt or supply air to any combination of the
three pairs of ports. The three pairs of ports supply pressure
to three different sized pistons. Each port is labeled "A,"
"B," or "C." The two "A" ports supply the smallest pistons.
The two "B" ports supply the intermediate sized pistons.
The two "C" ports supply the largest pistons. The torque
output is related to a change in air pressure and the number
and size of the pistons used.
A
A
B
C
C
B
FIGURE 2
THREE SOURCE PLUMBING
A
A
B
C
C
B
FIGURE 3
ONE SOURCE PLUMBING
NOTE
Only pairs of pistons A, B, or C should be used. Do
not use only one piston.
The second method is to plumb all six ports together so
they are supplied by one source. This method relates the
change in torque performance to change in air pressure.