APPLICATIONS:
Regulation of inlet pressure to gas compressors. Control of
supply or distribution system pressures.
PRESSURE RANGE:
Upstream: 50 psig to 500 psig
Downstream: 50 psig to 500 psig
PILOT SUPPLY PRESSURE:
40 psig
NOTE:
For upstream pressure less than 50 psig use outside source
of supply to operate MOTOR VALVE DIAPHRAGM.
OPERATION:
The Pilot assembly and Motor Valve Stem Assembly
(Crosshatched) are the only moving units in the regulator. The
PILOT PLUG consists of two stainless balls rigidly connected
together. The upper seat for the PILOT PLUG is the Motor Valve
Diaphragm Pressure inlet (Violet to Yellow). The lower seat for
the PILOT PLUG is the pressure vent (Yellow to Atmosphere).
The Pilot Supply Pressure (Violet) leads the MOTOR VALVE
DIAPHRAGM to provide the closing force for the Motor Valve
against the Upstream Pressure.
The PILOT SPRING in the bonnet loads the upper side of the
Pilot Assembly and is opposed in the under side by Downstream
Pressure (Blue) in the BELLOWS ASSEMBLY. Assume the
PILOT SPRING is compressed with the ADJUSTING SCREW for
a set pressure greater than the Downstream Pressure (Blue) in
the BELLOWS ASSEMBLY. The Pilot Assembly is forced downward
by the PILOT SPRING. The lower seat for the PILOT
PLUG (Yellow to Atmosphere) is closed and the upper seat for
the PILOT PLUG (Violet to Yellow) is open. This allows Pilot
Supply Pressure (Violet) to load the underneath side of the
MOTOR VALVE DIAPHRAGM to balance the pressure on the top
side. Upstream Pressure (Red) acting under the motor valve
seat, opens the valve.
As Downstream Pressure (Blue) increases to the set pressure,
the BELLOWS ASSEMBLY expands upward, compressing
the PILOT SPRING and first closing the upper seat (Violet to
Yellow) and then opening the pressure vent (Yellow to
Atmosphere). As the MOTOR VALVE DIAPHRAGM PRESSURE
(Yellow) is decreased, the PILOT SUPPLY PRESSURE acting on
top of the Motor Valve Diaphragm begins to close the valve.
With increase of Downstream Pressure (Blue) to the set pressure,
the Pilot Assembly assumes a position in which both seats
of the PILOT PLUG are closed.
The intermittent bleed pilot, three-way valve action of the
PILOT PLUG against its seats adjusts the Motor Valve
Stem Assembly to accommodate any flow rate. The rapid
but stable repositioning produces a true throttling action.
Regulation of inlet pressure to gas compressors. Control of
supply or distribution system pressures.
PRESSURE RANGE:
Upstream: 50 psig to 500 psig
Downstream: 50 psig to 500 psig
PILOT SUPPLY PRESSURE:
40 psig
NOTE:
For upstream pressure less than 50 psig use outside source
of supply to operate MOTOR VALVE DIAPHRAGM.
OPERATION:
The Pilot assembly and Motor Valve Stem Assembly
(Crosshatched) are the only moving units in the regulator. The
PILOT PLUG consists of two stainless balls rigidly connected
together. The upper seat for the PILOT PLUG is the Motor Valve
Diaphragm Pressure inlet (Violet to Yellow). The lower seat for
the PILOT PLUG is the pressure vent (Yellow to Atmosphere).
The Pilot Supply Pressure (Violet) leads the MOTOR VALVE
DIAPHRAGM to provide the closing force for the Motor Valve
against the Upstream Pressure.
The PILOT SPRING in the bonnet loads the upper side of the
Pilot Assembly and is opposed in the under side by Downstream
Pressure (Blue) in the BELLOWS ASSEMBLY. Assume the
PILOT SPRING is compressed with the ADJUSTING SCREW for
a set pressure greater than the Downstream Pressure (Blue) in
the BELLOWS ASSEMBLY. The Pilot Assembly is forced downward
by the PILOT SPRING. The lower seat for the PILOT
PLUG (Yellow to Atmosphere) is closed and the upper seat for
the PILOT PLUG (Violet to Yellow) is open. This allows Pilot
Supply Pressure (Violet) to load the underneath side of the
MOTOR VALVE DIAPHRAGM to balance the pressure on the top
side. Upstream Pressure (Red) acting under the motor valve
seat, opens the valve.
As Downstream Pressure (Blue) increases to the set pressure,
the BELLOWS ASSEMBLY expands upward, compressing
the PILOT SPRING and first closing the upper seat (Violet to
Yellow) and then opening the pressure vent (Yellow to
Atmosphere). As the MOTOR VALVE DIAPHRAGM PRESSURE
(Yellow) is decreased, the PILOT SUPPLY PRESSURE acting on
top of the Motor Valve Diaphragm begins to close the valve.
With increase of Downstream Pressure (Blue) to the set pressure,
the Pilot Assembly assumes a position in which both seats
of the PILOT PLUG are closed.
The intermittent bleed pilot, three-way valve action of the
PILOT PLUG against its seats adjusts the Motor Valve
Stem Assembly to accommodate any flow rate. The rapid
but stable repositioning produces a true throttling action.
| 貨號 | 連接尺寸 | 連接方式 | 描述 | 操作壓力 | 工作壓力 | 維修包 |
| A0304 | 2" | SCRD | 250 SGT PR-S | 500 | 500 | R0109 |
| A0305 | 2" | FLGD | 250 FGT PR-S | 500 | 500 | R0109 |
| A03041 | 2" | SCRD | 250 SGT-PR-STL | 500 | 500 | R0109 |
| A03051 | 2" | FLGD | 250 SGT-PR-STL | 500 | 500 | R0109 |
