Standard Components
Operation
The Combination Pressure Reducing and Solenoid On-Off ACV
is designed to automatically reduce a fluctuating higher upstream
pressure to a constant lower downstream pressure regardless of
varying flow rates, and open, allowing regulating action, or close
drip-tight as commanded by the Solenoid Pilot. It is controlled by a
normally open, pressure reducing pilot designed to: 1) Open (allow-
ing fluid out of the main valve cover chamber) when downstream
pressure is below the adjustable setpoint, and 2) Close (allowing
fluid to fill the main valve cover chamber) when downstream pres-
sure is above the adjustable setpoint. A decrease in downstream
pressure causes the valve to modulate toward an open position,
raising downstream pressure. An increase in downstream pressure
causes the valve to modulate toward a closed position, lowering
downstream pressure.
The Solenoid Pilot will either open to allow regulating action, or
close the valve drip-tight when energized. Specify energize to open
or close the Main Valve and voltage PRIOR to ordering.
1
X
X
X
Y/FC
P/L
4
2
CLOSES VALVE
OPENS VALVE
FLOW
3
(AOS)
Start-up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to
adjustments and the system to stabilize. The objective is to bring the valve into service in a controlled manner to protect the system
from damaging over-pressure.
1. Prior to installation, flush line to remove debris.
2. Install valve so the flow arrow matches flow through the line, and gauges to monitor valve inlet and outlet pressures. A Position
Indicator can be installed to provide visual indication of valve position and operation without disassembly.
3. Install isolation valves upstream and downstream of the main valve.
4. Connect solenoid wiring leads to desired switching device, using safe, standard electrical practices.
5. Close upstream and downstream isolation valves.
6. Open the isolation ball valves in the control tubing if so equipped. Failure to open these will prevent the valve from functioning
properly.
7. Install pressure gauges at locations upstream and downstream of the valve.
Note:
If using butterfly valves, ensure valve disc does not contact the main valve.
8. Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page.
9. Avoid installing valves 6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are
designed for horizontal in-line installation, with the cover facing up (main valve stem vertical). Slow operation or premature stem
and guide wear may occur if valve is not installed according to factory recommendations. Consult factory for detailed engineering
review prior to ordering if valve is to be installed other than horizontally in-line.
10. If valve is equipped with a pilot control system, extra precautions should be made during installation to protect the piping circuit
from damage. Only remove the pilot control system from the valve if necessary. Tubing and fittings should be kept clean and
replaced exactly as removed. Consult appropriate hydraulic schematic to ensure proper re-assembly.
11. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
1 - Main Valve (905GD - Single Chamber)
2 - Pressure Reducing Control
3 - 2-Way Solenoid
4 - Fixed Orifice
X - Isolation Cocks
Installation
910GD-15 (Globe) Pressure Reducing Control Valve with
Solenoid (On-Off) Feature
2 IOM-A-ACV-910-15_610-15 2115
EDP# 1917036
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