Manual Valves
Manual valve refers to valves that the user can open or close to increase or decrease the flow across the valve.
They can be only be added from the presets. The more important element is the flow coefficient. It represents the amount of water passing through the fully open valve with a difference of pressure of 1bar (SI) or 1psi (Imperial). The equation type links the opening percentage to the flow coefficient at the opening. It depends on the type of valve. If in doubt, using the linear equation should give an accurate result.
Fig. 3.2.2.1: The manual valve addition edit box.
- Selection
- Valve name – Valve name, including the size and type. More valves can be added in the presets.
- Size filter – Will only display valves with the selected size.
- Name
- Opening
- % Open – Percentage of valve opening.
- Flow Coefficient – The flow coefficient at this specific opening percentage, depending on the type of valve.
- Information
- Equation – The type of valve, it will influence the flow coefficient at opening.
- Fully Open Flow Coefficient – Depends on the valve and can be found in the valve manual. It is the quantity of flow passing through the valve with a pressure difference of 1bar (SI) or 1psi (Imperial).
- Size – Size of the entrance of the valve.
Automatic Valves
Automatic valves refer to valves that will automatically open or close themselves to achieve a set value.
Fig. 3.2.2.2: The automatic valve addition edit box.
- Selection – Valve name, including the size and type. More valves can be added in the presets.
- Data
- Reduced Pressure – The valve outlet gauge pressure is set. If the set pressure is too low, the valve may fully close. If the set pressure is higher than the pressure with the valve fully open, the valve will be fully open. If the flow tries to go backward, the valve will close.
- Sustained Pressure – The valve inlet gauge pressure is set. If the pressure with the valve fully open is greater than the set pressure the valve will stay open. If the valve pressure with the valve fully closed is smaller than the set pressure, the valve will close. If the flow tries to go backward, the valve will close.
- Ratio Reduction – Sets the difference of gauge pressure between entry and exit of the valve. If the set pressure is too low, it is possible that the valve will have to close. If the flow tries go backwards, the valve will close.
- Fix Flow – Fix the flow across the valve. If the set flow is higher than the flow with the valve fully open, the valve will be fully open.
- No Return – The valve will close if the flow tries to reverse.
- Info
- Size – Diameter of the valve entry.
- Cost – Price of one valve.
- Maximum Pressure – Maximum pressure which the valve can support before breaking.
- Notes