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PDRN (Dry Run & Stop)
Europe’s Largest Diaphragm Pump Manufacturer
Our Guardian System is a protection and energy-conservation device, designed by Tapflo UK, that stops an Air Operated Diaphragm (AOD) pump from running inefficiently, wasting energy, and shortening the life of its internal parts. It also adds a valuable layer of safety for high-risk applications, helping to protect both your process and the longevity of your installation.
The Guardian continuously monitors discharge fluid pressure against a configurable set point, stopping the pump whenever pressure rises above or falls below that point, depending on the configuration.
The standard system is a fully pneumatic, chemically inert pressure trip with an integral latching output control valve, while an electronic variant adds pressure indication and automatic shut-off on task completion. It suits all Tapflo AOD pumps from 2″ and up.
The Guardian is available before delivery to your site as a preassembled and preprogrammed system. Alternatively, you can fit the system yourself on site.
| Specifications | Description |
|---|---|
| Ambient Temperature (ºC) | -20 to 40 |
| Product Temperature (ºC) | -20 to 110 |
| Air Pressure (Bar) | 8 |
| Weight (Kg) | 2 |
| Dimensions (mm) | 96 x 71 x 161 |
For barrier pumps (TB) that have a backup set of diaphragms. The Guardian monitors the pressure between the two sets and stops the pump if it rises above the set point, keeping liquid contained if a diaphragm is breached.
The Guardian monitors discharge pressure and stops the pump if it falls below the set point, typically when a loss of media on the suction side draws in air. This extends the life of the pump’s wearing parts and reduces compressed-air consumption.
The Guardian monitors discharge pressure and stops the pump if it rises to the set point, which may be caused by a closed valve or over-pressure in the discharge line. The pump is restarted manually once cleared, protecting the wearing parts and ensuring safe, reliable operation.
Works on the same trigger as Dead Head & Stop, but once pressure falls back below the set point the pump restarts automatically. This protects the pump’s wearing parts while ensuring safe, hands-off operation.
An electronic system for reliable, safe AODD operation with reduced compressed-air use. It extends diaphragm life, limits discharge pressure, indicates live pressure values, and switches the pump off automatically once a task is complete.