Check Valve Attributes
- ID: Unique identifier assigned to this element.
- Label: Descriptive label for this element.
- Notes: Additional information about this element.
- GIS-IDs: List of associated IDs on the GIS/data-source side.
- Hyperlinks: Associate one or more web link, photo, word processing document, or other file with this element.
- Flow (Typical): This value is 0 should the valve be initially closed.
- Pressure (Threshold): The pressure difference between upstream and downstream side to (re)open the (closed) valve. If 0 entered, the valve (re)opens when the upstream pressure exceeds the downstream pressure.
- Closure Time: Time to close the valve, from the fully open position, after reverse flow is sensed. This establishes the rate of closure in case the valve's opening is partial.
- Open Time: Time to open the valve, from the fully closed position, after specified pressure difference is exceeded. This establishes the rate of opening in case the valve's closure is partial.
- Allow Disruption of Operation?: Determines whether an operation (opening or closing) can be terminated prematurely due to a signal to reverse.
- Located At Wye?: Specifies whether the check valve is simulated as a simple check valve in a run of pipe, or if it is simulated as a wye connection.
- Flow Direction: Choices: Towards Wye, Away from Wye
- Elevation: Elevation at centroid of junctions, valves, and pumps; the ground elevation at tanks; the hydraulic grade at reservoirs.
- Concentration (Initial): Specify the initial concentration for the global concentration at the selected element.
- Age (Initial): Specify the initial age of the fluid at the selected element.
- Installation Year: Specify the install year of the element. It does not affect the calculations.
- Trace (Initial): Specify the initial trace amount at the current location.
- Zone: Specify the zone for the element.
- Flow: Total flow through the check valve.
- Flow (Absolute): Magnitude of flow through the selected check valve.
- Pressure: Calculated pressure at the check valve.
- Hydraulic Grade: Calculated hydraulic grade at the check valve.
- Age (Calculated): Age at selected element for current time step.
- Trace (Calculated): Trace at selected element for current time step.
- Concentration (Calculated): Concentration at selected element for current time step.
- Has Calculation Messages Now?: If true then the current element has associated calculation warning messages for the current time step.
- Is Closed?: True if the current element is closed during the current time step.
- Is Open?: Set to true if open during the current time step.
- Is Initially Closed?: If true, the initial condition for the control element is "Closed" or "Off."
- Controlled?: Is true if a control action in the current control set references the selected element.
- Cannot Deliver Flow or Head?: If true then the cannot deliver head or cannot deliver flow warning was generated for the element for the current time step.
- Head (Maximum, Transient): Maximum head at node over the course of the transient simulation.
- Head (Minimum, Transient): Minimum head at node over the course of the transient simulation.
- Pressure (Maximum, Transient): Maximum pressure at node over the course of the transient simulation.
- Pressure (Minimum, Transient): Minimum pressure at node over the course of the transient simulation.
- Air Volume (Maximum, Transient): Maximum air volume at node over the course of the transient simulation. Not applicable to Reservoirs and Rating curves.
- Vapor Volume (Maximum, Transient): Maximum vapor volume at node over the course of the transient simulation. Not applicable to Reservoirs and Rating curves.