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VALVE SELECTION GUIDE
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By combining various control pilots, multiple valve functions can be performed on a single Series 125 or 126 Pump Control Valve. To find the combination function valve, select the desired features and then the model number. This chart shows only a sample of those most often specified valves. Consult the factory for specific data on the model you selected.
Combination valves can often reduce or eliminate other equipment. Example: If the system requires a Pump Control and a Pressure Sustaining Valve, the sustaining feature can be added as a function of the Pump Control Valve, Model 125-13.
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SELECTION OF PUMP CONTROL VALVES
Selecting and sizing the correct model of pump control valve begins with the pump itself. Refer again to Table 1.
Pumps such as split-case centrifugals or flooded suction turbines, commonly referred to as booster pumps, will use the Series 125.
Well pumps, such as vertical turbines or submersibles, may use either the Series 125 or the 126. To determine which, first consult with the pump manufacturer. If the pump is designed to start against a closed valve, use the Series 125. If the pump is designed to be started against an open valve, the choice is Model 126. If there is no preference, consider the characteristics of the well itself. Deeper wells, those with a significant air column, and those producing a significant amount of sand will benefit most from the Model 126. Relatively shallow, clean wells can use the Series 125.
If you have opted for the Series 125 booster pump control valve, your next step will be to choose between the single-chambered 125 and the dual-chambered 125-27. Certain factors can make this choice an easy one. For example, if you want to add modulating control pilots to the valve (e.g, pressure reducing, pressure sustaining), or if the maximum pressure (typically pump shut off pressure) is greater than 400 psi, your only choice will be the single-chambered valve. On the other hand, the chief advantage of the 125-27 is that of typically lower pressure loss. Now the choice is closely tied in with sizing. |
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