Advantages
CSI injectors use a pumped venturi to dose one liquid into another.
This technology has important advantages over other common injection techniques:
CSI Pumped Venturi Injectors |
vs. | Piston
and Diaphragm |
| Simple flow rate adjustment: No need to stop the injector. Adjust the metering valve and immediately see the effect of the adjustment on the built-in flowmeter. |
vs. | Complex flow rate adjustment: Stop injector. Change pump stroke length and calibrate. Repeat the procedure until you hope you have it right. |
| Foolproof calibration: Built-in flowmeter continuously shows actual flow rate of the injected liquid. |
vs. | Tiresome calibration procedure: Check flow rate by timing the emptying of a calibrated cylinder with a stop watch. Time-consuming and imprecise. |
| Excellent accuracy and
repeatability: Pumped venturi injects at constant rate over its whole operating pressure range. |
vs. | Flow varies with line pressure: Pipeline pressure changes the injection rate due to diaphragm flexing and/or ball-check seating. |
| Smooth flow: Venturi draws injected fluid into water stream smoothly and continuously. |
vs. | Pulsing flow: Flow starts and stops with each stroke of the pump. |
| Excellent dispersion: Injected materials go through 2 stages of dispersion, the first stage at the venturi and the second stage when the liquid enters the main pipeline. |
vs. | Poor dispersion: Concentrated material goes directly into the main pipeline without pre-dilution. Even "mister" injection valves can’t change the pulsating nature of the injection. |
| Simple, maintenance-free
mechanism: Water from centrifugal pump drives a venturi. No gears, pistons, diaphragms. Only one easy-to-repair wearing part: the centrifugal pump seal. No lubrication needed. |
vs. | Complex, maintenance-intensive
mechanism: Back-and-forth motion requires many moving parts. Repairs are frequent and take a skilled mechanic. Lube points and/or oil fill are needed. |
| No contact between pump and
the injected chemicals: Injected liquid enters the water stream at the venturi which is downstream from the centrifugal pump. |
vs. | Whole pump is in contact with
corrosive chemicals: All wetted pump components are in continuous contact with the corrosive effects of injected chemicals. |
| Greater safety: Concentrated chemicals move under vacuum. Leaks are less likely, and they cause less harm if they do occur. |
vs. | Less safety: Concentrated chemicals move under high pressure between the pump and the pipeline. They can spray out from any leak. |
| Wide capacity range: CSI's standard models allow injection rates from 1 gph to 1600 gph. Special designs are available for even higher flows. |
vs. | Narrower capacity range: Most competing piston and diaphragm pumps are limited to much lower flows. Multiple pumps are needed to achieve even modest flow rates. |
| Do it your way: CSI offers more standard choices than any other supplier. And our design allows modification for special requirements. |
vs. | Do it their way? |
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