Advertisement
WARNING
Please read these instructions carefully BEFORE this
instrument is installed or maintained.
These converters are intended for use in industrial
CAUTION
compressed air systems only. Ensure that adequate
pressure relief provision is installed if application of system
supply pressure could cause downstream equipment to
malfunction. Installation should be in accordance with
local and national compressed air and instrumentation
codes.
CAUTION
Products certified for use in explosion-proof or intrinsically
safe installations MUST:
a) Be installed in accordance with local and national codes
for hazardous area installations, and in accordance
with this manual.
WARNING
b) Only be used in situations which comply with the
certification conditions stated in this handbook.
c) Only be maintained by qualified personnel with
adequate training on hazardous area implementation.
Before using these products with fluids other than air or
CAUTION
for non- industrial applications consult GE.
DANGER
Installation
CAUTION
Do not use for air pressures exceeding 250 psi.
Prior to installing, clean all lines thoroughly to remove
all dirt, scale or other foreign matter. Install the lock-up
valve in the controller output line as near to the control
valve diaphragm chamber as possible, holding the
number of connections to a minimum—so that the air
flows through the body in the direction indicated by the
words INLET and OUTLET marked on the underside of
valve body.
The signal pressure line should be connected upstream
DANGER
of the air supply regulator to provide effective response
of the lock-up valve in the event of air failure. Be sure all
pipe connections are tight.
Do not install this Air Lock-up Valve in air lines
which exceed 250 psi (1.72 MPa, 17.2 bar) pressure.
4 | GE Oil & Gas
Adjustment
The lock-up valve is normally factory set (i.e., 20 psi for
3-15 psi operation or 35 psi for 6-30 psi operation) and
should not require adjustment. If, however, it becomes
necessary to adjust the setting an air supply, with a
gauge and regulator, should be piped to the signal
pressure connection after: (1) relieving compression on
the range spring of the lock-up valve; and (2) connecting
the instrument output line to the inlet connection of the
lock-up valve.
Instrument output pressure need be sufficient only to
determine the open and closed position of the lock-up
valve. Turn the air supply pressure on until the pressure
gauge indicates the desired set pressure, then turn the
adjusting screw down until no air pressure may be felt
coming from the outlet of the lock-up valve. The valve
will be fully closed at this point.
Finally, tighten the adjusting screw locknut and connect:
(1) the lock-up valve outlet connection to the control valve
diaphragm chamber; and (2) the signal pressure line to
the signal pressure connection of the lock-up valve. Turn
on and set the air supply to operating pressure. Be sure
that all pipe connections are tight.
© 2016 General Electric Company. All rights reserved.
Advertisement
