- Lightweight aluminum alloy body
- Easily mounted on most centrifugal pumps
- Tough and durable rubber diaphragm
- Units have a drain valve
Dimensions of Unit (Without Handle):10 7⁄8” x 9 5⁄16” x 12 1⁄4”
Internal Diameter: 3⁄4 NPT
Outer Diameter:1 1⁄2 NPT
DETAILS
The HAND DIAPHRAGM PRIMER is an air pump that creates vacuum in a centrifugal pump priming line and pulls water up into the pump to prime it. The Diaphragm Primer has a flapper check valve in the diaphragm and a disk check valve at the bottom of the unit. Air flows through the bottom check valve on the diaphragm up stroke then through the diaphragm valve on the down stroke. Diaphragm is actuated through a connecting rod eyebolt attached to a fulcrum handle bracket.
The vacuum priming system is used to pull water into the pump, which then allows the pump to start. It does this by creating a vacuum that extends from the top of the impeller right down to the water level of the reservoir from which the liquid is being pumped. As the vacuum removes air molecules from the pump, water is pushed up into it.
At the highest point of the priming system, you will find a priming valve. And while there are many types of priming valves, the most commonly used type uses a float to turn off the vacuum system once the water gets high enough to raise the float. This helps to ensure that water does not get inside the vacuum pump. When a sufficient amount of liquid has been pulled into the centrifugal pump, a sensor alerts the pump operator that the pump has been primed and that it is now safe to turn on the water pump drive motor
