<< Click to Display Table of Contents >> Navigation:  Wadiso 6 User Guide > Steady state analysis  > Definitions of steady state analysis terms > Pressure Sustaining Valve

A pressure sustaining valve (PSV) is a link. The pressure setting for a PSV is the pressure above ground level which the valve will try to maintain on the upstream side of the PSV. If the upstream pressure can be maintained at the pressure setting, the valve is ACTIVE. If the upstream pressure cannot be maintained, even with the valve closed, the valve is CLOSED. If the upstream pressure will be higher than the setting, even with the valve fully opened, the valve is OPEN. The operational mode of the valve (OPEN, ACTIVE, CLOSED) is indicated in the results viewers. A PSV link has no length associated with it. Although it is not a specific requirement, elevations of the beginning and ending nodes of the PSV link should be the same. Flow direction is from beginning node towards ending node.

 

For improved mathematical stability of the network solver, the beginning and/or ending nodes of a PSV should not coincide with the beginning or end node of any other special link types, such as check valves, pumps, and flow or pressure control valves.