Series 118/108SA - Surge Anticipation Valves

The OCV Series118/108SA surge anticipation valves are designed to be installed in a bypass line and provide protection against damaging surges that can occur in pumping systems when a pump is suddenly stopped. Unlike conventional relief valves, which open only when a high pressure wave hits, surge anticipation valves sense the precursor of the high pressure wave (pump power failure or low pressure wave) and opens in anticipation of the returning high pressure wave that follows. By opening, the valve prevents the buildup of pressure before it occurs.

• Model 118-4 Surge Anticipation-Electronic Valve
• Model 118-5 Surge Anticipation Valve-Electronic Type
• Model 108SA-3 Surge Anticipation- Hydraulic Type
• Surge Commander

Valve Features

• Operates automatically off line pressure.
• Heavy-duty, nylon-reinforced diaphragm.
• Rectangular-shaped, soft seat seal provides drip-tight Class VI closure.
• Diaphragm assembly Guided top and bottom.
• Throttling seat retainer for flow and pressure stability.
• Easily maintained without removal from the line.
• Replaceable seat ring.
• Alignment pins assure proper reassembly after maintenance.
• Valves are factory tested.
• Valves are serial numbered and registered to facilitate replacement parts and factory support.

APPLICATION STATEMENTS

Installed in the bypass line the valve discharges to atmosphere. Valve opens on power failure, low pressure signal or as a high pressure relief valve.

Valve Operation

ELECTRO HYDRAULIC MODEL 118-3

The control of the model 118-3 is via a three-way solenoid. This solenoid may be electrically interlocked to either the pump power or pump starter. If wired to the pump starter, the valve will automatically proceed in the opening cycle on each pump shutdown. Wired across pump power it opens only on pump power failure.

Valve opens when solenoid is deenergized – either directly on power failure or through pressure switch on low pressure – remains open for a predetermined time (accumulator fill), then slowly closes.

Valve also opens when set point of relief pilot is exceeded, then slowly closes when pressure returns to normal.

ELECTRO HYDRAULIC MODEL 118-4

The model 118-4, provides the basic functions of the Model 118-3. The electronic Surge Commander, is a self-powered module, designed with two selectable modes of operation allowing for finer tuning of the variables of when to open and how long to stay open.

Mode A – Opens valve when there is a power failure during pump run accompanied by a down surge in pressure.

Mode B – Opens valve when there is a power failure or when there is a down surge in pressure.

Both modes prevent unnecessary valve opening caused by power interruptions with no pump running. The time the valve remains open a precise time and is easily adjustable via a digital timer.

The valve also opens when set point of the high pressure relief pilot is exceeded, then slowly closes when pressure returns to normal.

HYDRAULIC MODEL 108SA-3

The control of the model 108SA-3 is via two hydraulic control pilots. A normally open, low pressure pilot that opens the valve when system pressure drops to its set point. This setting is typically 25 psi less than static pressure. The valve also opens when set point of the high pressure relief pilot is exceeded. The valve slowly closes when system pressure returns to normal (pressure is between the settings of the two pilots).