The Pneumostop is a pump overrun valve – designed to detect when a double diaphragm or air driven piston pump overruns, and shuts the pump down before damage occurs to the diaphragms due to running over-speed (Runaway). A runaway can be triggered by lack of product or line failures. Designed-in adjustable levels of sensitivity eliminates the nuisance of tripping due to cavitation, that causes pumps to dive periodically..
The Pneumostop is fitted into the air supply line to the pump and is set up to the optimum pressure and flow. When the pump overruns the Pneumostop detects the drop in pressure and the valve closes therefore stopping the air supply to the pump. When armed the Pneumostop has a permanent air output signal available which is equal to the supply pressure to the pump. This output can be used to indicate a healthy operating state, or pump enabled status. This output is lost when a runaway is detected.