11
FORM NO. L-21699-B-1120
AIR CONTROLS AND PROGRAMMING
Minimum release pressure = 4 bar [60 psi]
Maximum pressure = 8 bar [120 psi]
CYLINDER MOUNTING
Cylinder functioning is regulated by a 5/3 valve (use
cylinder manufacturer’s recommend Cv valves), center
open on the central port and supplied by exhaust
ports.
NOTE: Do not use a valve with a closed center.
This will cause unbalance in the piston if any of the
circuits leak.
One-directional flow reducers can be used to control
the speed of the cylinder rod. To ensure fast braking
of the rod, a quick exhaust valve can be installed on or
near the rod lock.
The normally closed (NC) solenoid valve directs the air
supply to the rod lock, keeping it disengaged until the
electrical signal is interrupted.
Vertical Mounting:
The force on the piston must not
exceed its locking capacity when it is combined with
the force of the load.
Use of a 5/3 valve provides a braking effect and
maintains accurate rod positioning. Stopping precision
is determined by the rate of speed of the rod and loads
in motion.
Horizontal Mounting:
Pressure is maintained on
both sides of the cylinder piston, keeping it balance,
preventing displacement of the rod upon release. Use
exhaust ports 3 and 5 (see below).
STAND-ALONE MOUNTING
Specifications match those of cylinder models listed
above.
Figure 8
W
Lowering
Control
Raising
Control
5
3
4
2
12
1
1
3
2
Rod Lock
Flow Control
Valves
3-Way Valve
Regulator
5/3 Valve
Quick Exhaust Valve
Manual Override,
Defaults to Lock
(If Equipped)
System Shown:
Vertical mounting
with the load on top of the cylinder
Figure 10
System Shown:
Cylinder control using a 5/3
valve with the center open on the central port.
Figure 9
System Shown:
Cylinder control using a 5/3
valve with the center open on the central port.
W
1
3
5
3
4
2
2
12
Inward
Control
Outward
Control
Flow
Control
Valves
Rod Lock
3-Way
Valve
5/3 Valve
Quick
Exhaust
Valve
Manual Override, Defaults to Lock
(If Equipped)
Lowering
Control
Raising
Control
W
1
3
2
5
3
4
2
12
1
Rod
Lock
Flow Control
Valves
Regulator
5/3 Valve
3-Way
Valve
Quick
Exhaust
Valve
Manual Override,
Defaults to Lock
(If Equipped)
CAUTION
When programming the Nexen Rod
Lock in motion control systems, it is
critical to avoid repeated overlapping
conditions (i.e.: forced motion during the
engagement or disengagement of the Rod
Lock). Shaft damage will result. Design
the control system to use the Rod Lock in
static conditions.
Nexen’s Rod Lock must mount to a shaft
hardened to a minimum of HRC60 or hard-
chrome plated to a minimum thickness of
20 microns [0.0008 in] or damage to the
shaft may result.
Note: Pneumatic components are in accordance with
ISO 4414.
