Standard Components
Operation
The One-Way Flow Altitude Automatic Control Valve (ACV) with
Pressure Sustaining Feature is designed to open, allowing flow into a
reservoir or elevated storage tank (tank fill), and close drip tight when
high water level is achieved. The valve will also throttle to sustain a min-
imum upstream pressure during tank filling operations. The Altitude Pilot
remotely senses static tank head pressure (water level) through a field
P(L)
1
X
X
5
4
2
X
Y/FC
CLOSES VALVE
OPENS VALVE
FLOW
3
(Tank Sense Line)
6
7
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. Avoid installing
valves 6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are designed for horizon-
tal 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 order-
ing if valve is to be installed other than horizontally in-line.
5. 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.
6. Check to confirm that the sense line is installed and connected.
7. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
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.
installed sensing line, and directs pressure into and out of the cover chamber of the 3-way Accelerator Pilot. When the cover of the Accelerator
Pilot is pressurized, the main valve cover chamber is vented downstream, causing the valve to open. When the cover of the Accelerator Pilot is
de-pressurized, the main valve cover chamber is connected to upstream pressure, causing the valve to close drip tight.
As water level decreases, static tank head pressure falls below the adjustable setpoint of the Altitude Pilot, causing it to pressurize the cover of
the Accelerator Pilot, opening the valve. As water level increases, static tank head exceeds the adjustable setpoint of the Altitude Pilot, causing
it to depressurize the cover of the Accelerator Pilot, closing the valve drip tight. Valve opening and closing speeds are separately adjustable.
The Position Indicator with Air Bleed Petcock allow for visual indication of valve position, and allows easy venting of air entrapped in the main
valve cover chamber.
The normally closed sustaining pilot remains open when upstream pressure is above the adjustable setpoint, and modulates toward a closed
position if upstream pressure falls below the setpoint. As the sustaining pilot closes, fluid is directed into the main valve cover chamber through
the integral orifice of the Accelerator Pilot, allowing the valve to modulate toward a closed position, raising upstream pressure. Normal tank fill
operation resumes when upstream pressure is above the sustaining pilot setpoint.
Specify Tank height PRIOR to ordering.
1 – Main Valve (M100 – Single Chamber)
2 – Model 22 Accelerator Control
3 – Altitude Control
4 – Check Valve
5 – Pressure Sustaining Control
6 – Adjustable Closing Speed
7 – Adjustable Opening Speed
P – Position Indicator
X – Isolation Cocks
Installation
LFM127-8 (Globe) One-Way Flow Altitude Control Valve with
Pressure Sustaining Feature
2 IOM-ACV-127-8_6127-8 2115
EDP# 1917065
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