The Active Valve (AV) Operation Change Data dialog box is accessed by clicking on the Active Valve Operation  button from the InfoSurge toolbar when you have a valve selected. 

This dialog box is used to Activate/Deactivate the valve as an Active Valve in the surge analysis and to specify the bypass line and the check valve if required. In order to access this screen, the valve type must first be set to Throttle Control Valve (TCV), Pressure Reducing Valve (PRV), or Flow Control Valve (FCV) in the Attribute Browser. Other valve types cannot be used in a surge analysis. PRV and FCV, which are selected to participate in transient modeling, are represented by an active valve with their regulating parameters. The resistance of PRV and FCV will be updated as a result of pressure change and flow change, respectively, during a surge run. The valve's PID control can be taken into account through the TCV Active Valve in a surge analysis.

The choice of valve type is significant because the different valve types will have different closure profiles for the same stem change curve. More specifically, the different valve types will be open different amounts for the same stem position. The curves for valve position during a surge analysis are determined by the Active Valve Characteristics Curve Generator.

After defining this valve as an AV by clicking the Activate button, select a curve in the AV operation change data. 

Disable this Active Valve

If selected, this valve will not be analyzed.

Regulator Data

Regulator Data is used only for PRV and FCV active valves.

  • Pressure Setting or Flow Setting - The pressure or flow setting for the PRV and FCV, respectively.

  • Response Time - The time for the PRV to respond. Response Time does not apply to FCV.

Bypass Installed

Bypass is only used for TCV active valves. If this box is checked, this indicates that there is a Bypass line installed for the selected valve. A bypass line is a pipe that goes around the valve from inlet to outlet that functions to reduce transients in the event of a valve operational surge.

  • Bypass Resistance - Resistance valve of the Bypass line.

Check Valve Installed

Check valve is only used for TCV active valves. If this box is checked, then a check valve will be modeled for this device. A Check Valve (CV) prevents flow reversal through the valve.

  • Check Valve Opening and Closing Time - This is the amount of time in seconds that it takes for the check valve to go either from fully opened to fully closed or the opposite

  • Non-Reopen Check Valve - If this box is checked then the check valve will not open once it has closed. Please note: If this option is selected and the check valve starts in the closed position, it will not reopen for the duration of the simulation.

PID Control

  • Select Controlling Pipe - Click to select a pipe that the active valve's PID control is based on.

  • Pipe ID - The ID of the controlling pipe.

  • Target Flow - The target flow for the PID controller on the active valve.

  • Gain - The proportional term parameter for the PID controller. If left blank or zero, the proportional term is not used.

  • Integral Time - Time for the integral term for the PID controller. If left blank or zero, the proportional term is not used.

  • Differential Time - Time for the differential term for the PID controller. If left blank or zero, the proportional term is not used.

PID Controls are only used for TCV active valves.

Deactivate - Click Deactivate to deactivate. The valve will not be analyzed.

Activate - Click Activate to activate. This valve will be activated and analyzed.

Create/Update - Click Create/Update to create changes. Save any changes and exit the Active Valve Editor.

Cancel - Click Cancel to cancel any changes and exit the Active Valve Editor.