air driven liquid pump

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Working of air driven liquid pump Explained
Today, electrically & gasoline driven pumps and boosters are being replaced by air driven liquid pump and boosters because air driven liquid pressure pumps are found to be cost effective and energy saving. In addition air driven liquid pressure pumps are safer for use with hazardous/combustible liquids due as the pump is powered using compressed air and not electricity. This has led to the increased popularity of air driven hydraulic pumps in the Oil & Gas, Chemical, Industrial and Research industries. A question that must have popped up your mind is how are hydraulic pumps driven by compressed air work? You will find the answer to this question in this post. This post will also discuss the most common applications of where you these air driven liquid pressure pumps are used.
 
How the air driven hydraulic pumps operate
• As a first step, the spool valve allows the drive air to flow from air port to air pistons bottom.
 
• The pump performs a suction stroke as the air piston in the drive unit moves to the right.
 
• Now, the intake valve opens, and fluid is sucked by the high-pressure piston. This fluid is sucked in through the suction port.
 
• The pilot valve is actuated by the air piston, which is in the upper stop position.
 
• The control air, which moves from the air port to the spool valve, causes the valve to change its switching position.
 
• The spool valve now connects the silencer and the chamber, which is present below the air piston. This allows the drive air to escape through port R. Simultaneously, the air pistons top is accessed by the drive air.
 
• Now, a pressure stroke is performed, which causes the air piston in the drive unit to move in the left direction. This cause the inlet valve to close.
 
• All this causes the pressure valve to open. The piston (which is at a high pressure) then drives the pumped fluid, which comes out from the pressure outlet.