Type 92W
4
Adjustment
On a regulator with a standard or pressure-loaded
Type 6492H or 6492L pilot, loosen the hex nut
(key 16, Figure 4). Turn the adjusting screw (key 15,
Figure 4) into the spring case to increase the downstream
pressure. Turn the adjusting screw out of the spring
case to decrease the downstream pressure. When
the required downstream pressure is maintained
for several minutes, tighten the hex nut to lock the
adjusting screw in position.
O
n a regulator with a pressure-loaded Type 6492H
or 6492L pilot, also refer to the instruction manual of
the pressure-loading device for downstream pressure
adjustment procedures. Make sure that the combined pilot
control spring setting pressure and spring case loading
pressure does not exceed 150 psig (10,3 bar) for the
Type 6492H pilot or 25 psig (1,7 bar) for the Type 6492L
pilot. For example, combining a 5 psig (0,34 bar) spring
setting pressure and a 10 psig (0,69 bar) spring case loading
pressure results in a regulator pressure of 15 psig (1,0 bar).
Startup with New Regulator Installation
1. Remove all pilot control spring compression by turning
the adjusting screw out of the spring case according to
the adjustment procedure.
2. Slowly open the upstream block valve.
3. Open the downstream block valve.
4. Open the control line shutoff valve.
5. If a bypass is used, slowly close the bypass line
block valve. .
6. Perform the adjustment procedure until the downstream
pressure reaches the desired setting.
Figure 2. Typical Installations
Startup with Existing Regulator
Installation After Normal Shutdown
1. Open the upstream and downstream block valves and
let the regulator take over control at the existing pilot
control spring setting. .
2. If a bypass line is used, slowly control the bypass line
block valve. .
Shutdown
1. If a bypass line is used, slowly open the bypass line
block valve while monitoring the downstream pressure.
2. Close the control line shutoff valve.
3. Close the downstream block valve.
4. Close the upstream block valve.
5. If a pressure-loaded or on-off pilot is used, close the
needle valve to the pilot. .
6. Vent the regulator and control line to release any
trapped pressure.
Principle of Operation
Pilot supply pressure is piped from the main valve inlet
(Figure 3) to the pilot inlet connection. Downstream
pressure registers on the main valve pistons through the
downstream control line and then on the pilot diaphragm.
When increased downstream demand lowers the
downstream pressure to a value below the setting of the
pilot control spring, this spring forces the pilot valve plug
open to increase the loading pressure on the main valve
16A7958-B
A2607-1
WITH STANDARD PILOT WITH PRESSURE-LOADED PILOT
AIR
LOADING
REGULATOR
NEEDLE
VALVE
BLEED RESTRICTION (REQUIRED ONLY
IF THE LOADING REGULATOR DOES
NOT HAVE INTERNAL RELIEF)
CONTROL LINE
CONNECTION
CONTROL LINE
SHUT OFF VALVE
STRAINER
BLOCK
VALVES
VENT VALVE
BYPASS LINE
BLOCK
VALVE
16A7958-B
16A1547-A
A3334
CONTROL LINE
CONNECTION
CONTROL LINE
SHUTOFF VALVE
STRAINER
BLOCK
VALVES
VENT VALVE
BYPASS LINE
BLOCK
VALVE
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