Standard Components
Operation
The Combination Surge Anticipator and Pressure Relief Automatic
Control Valve (ACV) is designed to minimize the effects of water
hammer and pressure surges resulting from: 1) Normal pump start-
ing and stopping operations or 2) Mechanical or electrical power
failure situations. The valve senses hydraulic pressure changes
directly from the pump station discharge header, and opens to
relieve pipeline surges when pump station discharge header pres-
sure falls below the adjustable spring setting of the low pressure
opening pilot OR exceeds the adjustable spring setting of the high
pressure relief pilot. These two pressure conditions occur during
normal pump starting and stopping operations or when an active
pumping cycle is interrupted by electrical or mechanical failure.
1
X
X
X
7A
7B
5
4
3
6
9
2
P(L)
8
CLOSES VALVE
OPENS VALVE
FLOW
X / Y
Supply
Pressure
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.
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.
High Pressure Relief Operation
: When discharge header pressure exceeds the adjustable setpoint, the high pressure relief pilot
opens, venting main valve cover pressure downstream, causing the valve to quickly open and dissipate the high pressure surge. When
discharge header pressure falls below the adjustable setpoint, the high-pressure relief pilot closes, allowing pressure to fill the main
valve cover chamber, slowly closing the valve. This condition occurs during normal pump starting and stopping operations.
Low Pressure Opening Operation (Surge Anticipation):
When discharge header pressure falls below the adjustable setpoint, the
low-pressure pilot opens and the drain pilot closes, "storing" main valve cover pressure in the hydraulic accumulator. The main valve
opens at an adjustable rate in anticipation of the returning high-pressure wave. This condition occurs during a mechanical or electrical
power failure situation.
Valve Closing:
When discharge header pressure recovers above the adjustable setpoint, the low-pressure pilot closes, allowing header
pressure to fill the main valve cover chamber. The main valve closes at an adjustable rate to avoid creating additional pressure surges.
The accumulator drain pilot opens, releasing the "stored" main valve cover pressure.
If discharge header pressure does not "recover" above the low-pressure opening setpoint, the "stored" pressure in the hydraulic accu-
mulator allows the main valve to close, avoiding system siphonage or draining the pumping system.
1 – Main Valve (M100 – Single Chamber)
2 – Adjustable Closing Speed
3 – Adjustable Opening Speed
4 – Pressure Relief Control
5 – Low Pressure Control
6 – Accumulator Drain Valve
7 – Test Valves
8 – Pressure Gauge
9 – Hydraulic Accumulator
P – Position Indicator
Y – Y-Strainer
X – Isolation Cocks
Installation
LFM116-52 (Globe) Pressure Relief and Surge Anticipator
Control Valve
2 IOM-ACV-116-52_6116-52 2115
EDP# 1917053
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