Operation
Installation
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.
Note:
If using butterfly valves, ensure valve disc does not contact the main valve.
4. Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page.
5. 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.
6. 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.
7. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
The ACV Pressure Reducing Control Valve is designed to
automati-cally reduce a fluctuating higher upstream pressure to
a constant lower downstream pressure regardless of varying flow
rates. It is controlled by a normally open, pressure reducing pilot
designed to: 1) Open (allowing 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 pressure is above the adjustable
setpoint. A decrease in down-stream pressure causes the valve
to modulate toward an open posi-tion, raising downstream pres-
sure. An increase in downstream pres-sure causes the valve to
modulate toward a closed position, lowering downstream
pressure.
Standard Components
1 — Main Valve (905GD – Single Chamber)
2 — Pressure Reducing Control
3 — Fixed Orifice
X — Isolation Cocks
910GD (Globe) Pressure Reducing Control Valve
2 IOM-A-ACV-910_610 2115
EDP# 1917028
© 2021 Watts
