Standard Components
Operation
The Pressure Sustaining and Solenoid (On-Off) ACV with Hydraulic
Check Feature is designed to permit flow when upstream pressure
is above the adjustable setpoint of the control pilot, and throttle
toward closed when upstream pressure falls below the adjustable
setpoint. It is controlled by a normally closed control pilot designed
to: 1) Open (allowing fluid out of the main valve cover chamber)
when upstream pressure is above the adjustable setpoint, and,
2) Close (allowing fluid to fill the main valve cover chamber) when
upstream pressure is below the adjustable setpoint. An increase in
upstream pressure causes the valve to modulate toward an open
position. A decrease in upstream pressure causes the valve to
modulate toward a closed position.
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.
If downstream pressure becomes greater than upstream pressure,
downstream pressure is admitted to the main valve cover chamber,
closing the valve and preventing reversal of flow. Normal backpres-
sure or sustaining operation resumes when upstream pressure
exceeds downstream pressure.
When the valve is located “in line” connecting two distribution
zones, the valve acts as a Pressure Sustaining Control Valve. When
pressure in the upstream zone falls below the pilot setting, the valve
modulates toward a closed position, sustaining pressure in the
upstream zone. The valve will close, if necessary, until upstream
pressure is above the pilot setting. The valve should be specified to
include the optional opening speed control and position indicator
when used for Pressure Sustaining applications
1
X
X
X
Y/FC
3
(AOS)
1
2
P/L
4
CLOSES VALVE
OPENS VALVE
FLOW
5
5
1. Clear the line free of slag and other debris.
2. Install the valve so that the FLOW ARROW marked on the valve body/tag corresponds to flow through the line.
3. Close upstream and downstream isolation valves.
4. Open the ball valves or isolation cocks in the control tubing if so equipped. Failure to open these will prevent the valve from func-
tioning properly.
5. Connect solenoid wiring leads to the desired switching device, using safe, standard electrical procedures.
6. Install pressure gauge at a location upstream of the valve.
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 – Main Valve (M100 - Single Chamber)
2 – Pressure Sustaining Control
3 – Adjustable Closing Speed
4 – 2-Way Solenoid
5 – Check Valve
X – Isolation Cocks
Installation
LFM116-32 (Globe) Pressure Sustaining Control Valve with
Solenoid (On-Off) and Hydraulic Check Feature
2 IOM-ACV-116-32_6116-32 2115
EDP# 1917049
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