Type 92W
5
pistons. At the same time, the increased demand lowers
the downstream pressure on the main valve piston(s).
This opens the main valve plug, increasing ow to the
downstream system to satisfy the increased demand and
to restore downstream pressure to the setting of the pilot
control spring.
Decreased downstream demand increases the downstream
pressure registered on the pilot diaphragm. The increased
pressure overcomes the force of the pilot control spring
and allows the pilot valve plug spring to close the pilot
valve plug. As the pilot valve plug closes, excess loading
pressure bleeds to the downstream system through the pilot
bleed restriction. At the same time, decreased downstream
demand increases the downstream pressure registered
on the main valve piston(s). This allows the main valve
spring to close the main valve plug, reducing ow to the
downstream system in response to the decreased demand.
With a pressure-loaded or on-off pilot, the operation is the
same as for a standard pilot except that the pilot control
spring force on the pilot valve plug is aided by pneumatic
pressure from the loading device or solenoid valve.
Maintenance
Regulator parts are subject to normal wear and must be
inspected periodically and replaced as necessary. The
frequency of inspection and replacement depends upon
the severity of service conditions and upon applicable
codes and government regulations.
Figure 3. Operational Schematics
A6552 A6553
TYPE 92W WITH TYPE 6492H PILOT
NPS 2-1/2 THROUGH 6 X 4 (DN 65 THROUGH 150 X 100) MAIN VALVE
Avoid personal injury or damage to
property from sudden release of pressure
or uncontrolled process uid. Before
starting to disassemble:
• Isolate the regulator from the process,
• Release process pressure, and .
• Vent the pilot supply and main valve
loading pressures. .
Types 6492H and 6492L Pilots
These procedures are to be performed if inspecting,
cleaning, or replacing any pilot parts, or if cycling, erratic
control, or too high or too low an outlet (control) pressure
is noted. Perform only those procedures in this section
required to correct the problem. Key numbers refer to
Figure 4 unless otherwise noted.
Note
Before performing any maintenance,
loosen the hex nut (key 16), if used,
and turn the adjusting screw (key 15)
counterclockwise until all compression is
removed from the control spring (key 12).
Remove the pilot from the pipe nipple and
connectors (keys 82 and 83, Figure 6). .
!
WARNING
TYPE 92W WITH TYPE 6492L PILOT
NPS 1 THROUGH 2 (DN 25 THROUGH 50) MAIN VALVE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
Type 92S Self-Powered Control Valve
August 2007
Type 92S
Type 92S 2-1/2 thru 6 x 4-Inch (DN 65 thru 150 x 100)
A6553
September 2006
Type 92S
(1 páginas)
(12 páginas)
(38 páginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais