Flowserve Automax Lockup System User Manual
Flowserve Corporation 765 South 100 East Phone: 801 373 3028
Flow Control Division Provo, Utah 84606 Facsimile:801 489 2228
www.flowserve.com Email: actuators@flowserve.com
Automax Valve Automation Systems
Installation, Operation and Maintenance Instructions
AXAIM030-00 (AUTO-92) 03/01 Page 1 of 1
© 2001, Flowserve Corporation, Provo, UT
Introduction
The Automax lockup system provides a fail in-place
lockup system for Automax actuators upon supply and/or
instrument signal air failure.The lockup system provides
a reliable, quick response due to the immediate on-off
operation of the 2-way, pilot operated lockup valve.The
lockup system is an economical and compact design for
easy installation where space limitations are a concern,
and is offered in a 1/4” NPT port size. The switching valve
provides an easy, accurate adjustment to achieve the
desired pressure change necessary to operate the lockup
valves.The adjustable trip pressure can be set for supply
and/or signal pressure to the system.
Operation
When the air supply pressure is greater than the set point
of the supply switching valve, the 2-way air pilot operated
lockup valves will shift to the actuated position.The actuator
can then be operated by the positioner or solenoid valve.
When the air supply pressure drops below the set point, the
switching valve will shift, interrupting the pilot supply to the
lockup valves and causing the actuator to fail in place.
When the air supply returns to a pressure greater than the
switching valve set point, normal operation will occur.The
lockup system for loss of signal or supply operates in the
same manner, with the signal switching valve adjusted to
shift when the signal air pressure drops below 3 psig.
Calibration
1. To change the set point of the switching valve,
loosen the locknut on the adjustment screw.
2. With the air supply regulated to the desired failure
pressure, rotate the adjustment screw.Turn the
adjustment screw clockwise to increase the control
pressure, or counterclockwise to decrease the control
pressure.The supply switching valve is factory set
at 40 psig, and the signal switching valve is factory
set at 2 psig.
3.
For supply switching valve adjustment:
With regulated input signal air supplied to signal port
on lockup valve, cycle actuator while turning adjustment
screw on lockup valve. Actuator will lock in place when
adjustment screw setting corresponds to desired
input signal pressure.
For signal switching valve adjustment:
Rotate the adjustment screw until the supply air bleeds
through port C, and then turn in the opposite direction
until bleeding ceases.The bleeding air from port C
indicates that the valve has shifted (see Fig.1).
4. Tighten the locknut after adjustment.
Automax Lockup System
1/4" NPT SUPPLY
IN
IN
1/4" NPT SIGNAL
SWITCHING PORT
ADJUSTMENT SCREW
ADJUSTMENT SCREW
LOCKNUT
SIG
Fig. 1 – Lockup Valve
Loss of Supply
Loss of Supply or Signal
DA ACTUATOR
DA ACTUATOR
LOCKUP
VALVE
LOCKUP
VALVE
CCW
CW
SIGNAL SWITCHING
VALVE
CCW
CW
02
POSITIONER
01
02
POSITIONER
01
I
S
I
S
INSTRUMENT SIGNAL
AIR (3-15 PSI)
SUPPLY AIR
INSTRUMENT SIGNAL
AIR (3-15 PSI)
SUPPLY AIR
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