A Surge Anticipation Valve activates on a down surge when the pressure at the sensing node drops below the opening pressure. After opening is initiated the surge anticipation valve completes a cycle where it opens fully in the opening time, remains fully open for the fully open time and closes completely in the closing time. If the valve exits to a pressurized region (e.g., a tank) the External Pressure should be specified. The pressure to activate the valve is generally sensed at the valve but any node can be used for this purpose.

Disable This Surge Protection Device

If this box is checked, then the selected SPD will not be modeled in the Surge analysis.

Device Type

Type of Surge Protection Device to be used.

Surge Anticipation Valve Input Data

  • Inflow Resistance - This specifies the amount of resistance to flow into the system (pipe).

  • Outflow Resistance - This specifies the amount of resistance to flow out of the system (pipe).

  • External  Pressure - This field is the external pressure next to the pipe. A value of 0 means exiting to the atmosphere. The Pressure unit is set in the Simulation Options. 

  • Opening Time - This is the time in seconds that the valve takes to fully open.

  • Closing Time - This is the time in seconds that the valve takes to fully close.

  • Fully Open Time - The amount of time that the valve stays fully open once activated.

  • Sensing Node ID - This is the location of the node where the sensor for the PRV is installed.

Purge - Use the Purge button to remove existing Data.

Create/Update - Enter new or changed data and exit the dialog box.

Cancel - Cancels any new or changed data and closes the dialog box.