# Database of Manually Operated Valves | Top Previous Next

As an example of how the various databases are structured we will look closer at the dataset of manually operated valves. The dataset of manual valves is actually a subset of a larger database containing all fluid equipment components or items. The full database describes performance, limitations, and usage of all items on the component palette. To view, edit, delete, or add to the manual valves subset, make the selection from the 'Database | Valves' menu, to display the 'Database Editor - Valves' dialog: The Database Editor is also used for viewing, editing, deleting, and adding other fluid equipment items so the skills we learn here can also be applied to other items of fluid equipment. On the left side of the editor dialog is a tree control that enables you to quickly access the individual item you need in the hierarchy. You can reorganize the tree if this is more convenient. Below we see the valves data tree re-organized according to manufacturer. In this dataset there are 8 manufacturers of butterfly valves shown in alphanumeric order. Adding new Data: With all FluidFlow datasets the method of data entry is identical. In general we follow these steps: 1.Select the appropriate dataset - use 'Database | Dataset Name' from the application menu. 2.Press the 'Add' button. 3.Enter a unique name and press 'OK'. 4.Enter the data that describes the component (fluid equipment item). Add a new Valve: To add a new gate type valve, select 'Database | Valves' from the application menu. This will display the 'Database Editor - Valves' dialog, identical to that shown earlier in this section. Organize the tree according to Component Kind and click on the branch titled "Gate Valve". After clicking at this branch the 'Add' button should be enabled. Click the 'Add' button enter a name say "My Valve" and press the 'OK' button. The Editor should look like: You can now edit the default data via the Data Inspector. For example you could assign a manufacturer or several materials. The data available for this valve is provided by the manufacturer: Size = 100mm with pressure loss data expressed as a Cv value in usgpm/psi. The pressure loss data is tabulated in Table 4. Table 4 After you enter at least 3 sets of data points a curve fit of the data points occurs automatically. You can change the type of curve fit and if you select a polynomial you can also fix the order. The graph allows you to visually judge how the curve fit appears over the whole of the possible range. You can also zoom the graph for more detail and make a printout from this dialog. We cannot emphasize enough, that it is vital that you check your data after adding any new component. You need to check the data for continuity over all possible operating positions/range and that you have also entered all additional data needed.