AODD pumps(also known as Air operated diaphragms pumps, pneumatic diaphragm pumps, an AODD pump, and AOD pumps) are employed for endless applications in mining, industrial and general plant life service. Powered just by pressurized air, they're especially used where power isn't available, or in explosive or flammable areas.
AOD pumps are a type of noodle pump that comprises two diaphragms driven by compressed air. Air section with shuttle valve applies air alternately into the two diaphragms, each diaphragm has a pair of check/ball valves.
In this post, we'll learn more about the operation principle of AODD pumps.
FIGURE ONE
The air valve sends pressurized air to the backside of Diaphragm A, shoving it away from the center of this pump. Acting for a separation membrane involving the compressed air and liquid, the elastomeric diaphragm applies pressure into the liquid pillar, while also balancing the load as a way to eliminate mechanical stress by the diaphragm.
Since the pressurized atmosphere transfers Diaphragm Afar from the midpoint of this pump to its release stroke, the pressure generated within Chamber A pushes from the liquid by its discharge valve.
In exactly the same time frame, the common shaft pulls the opposite diaphragm (Diaphragm B) inward in its own suction stroke with an atmosphere behind it having been forced from the air through the exhaust port of the pump.
The movement of Diaphragm B toward the center of the pump creates a vacuum within Chamber B. Atmospheric pressure pushes fluid to the inlet manifold pushing the coil valve ball in Chamber B off its own seat. The liquid is then liberated to proceed beyond the inlet valve ball and also fill liquid Chamber B (see shaded area).
FIGURE TWO
Once the pressurized diaphragm, Diaphragm A, reaches the limit of its release stroke, the air valve Re-directs pressurized air to the backside of Diaphragm B.
The pressurized air forces Diaphragm B apart from the center when yanking Diaphragm A toward the Middle via the Frequent shaft.
Diaphragm B is now on its discharge stroke, which forces the inlet valve ball in Chamber B on its seat because of the hydraulic forces developed in Chamber B and the manifold of this pump. All these exact same hydraulic powers lift the release valve ball off its seat in Chamber B, while the opposite discharge valve chunk Chamber A is coerced on its chair, forcing the fluid to flow through the pump discharge.
The inlet valve chunk Chamber A is forced off its chair, allowing the fluid being pumped into fill Chamber A from the noodle.
FIGURE THREE
In the completion of the stroke, the air valve redirects the atmosphere to the bottom of Diaphragm A, which starts Diaphragm B on its exhaust stroke.
As the pump reaches its original starting point, each diaphragm has gone through one exhaust and one discharge stroke. This constitutes one entire pumping cycle.
The pump might take several cycles to completely prime based on the terms of the application.
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