Nexen STB600 927239 - Manual (Page 6)

6 FORM NO. L-20300-C-0511
FIGURE 2
THREE SOURCE PLUMBING
Refer to Figures 2 & 3.
The Nexen STB has six air ports. All six air ports accept 1/8''
NPT fittings. Air line connections 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.
NOTE
Only pairs of pistons A, B, or C should be used. Do
not use only one port.
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 only.
RING GUARD INSTALLATION
Refer to Figure 4.
1. Align the mounting holes of the Ring Guard with the
six tapped holes on the STB Mounting Flange.
2. Using the six supplied fasteners, secure the Ring Guard
to the STB. Tighten to 35 in-lbs.
3. Place the End Cap onto the Ring Guard and secure it
in place by bending its tabs around the Ring Guard.
4. Route air lines through fitting on top of guard.
FIGURE 3
ONE SOURCE PLUMBING
FIGURE 4
STB
Mounting
Flange
Ring
Guard
End
Cap
Fitting
Supplied
Fastener
B
C
A
B
C
A
AIR CONNECTIONS
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.
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.