Page 5 - Ingersoll Rand - ARO EXPert Series Diaphragm Pumps 3/8" Through 3" Fluid Ports

Patented Valve Technology in Operation
EXPert Series Pump

Unbalanced valve design
eliminates valve centering and
pump stall-out even under low
air inlet pressures.
“D” Valve

w Provides a positive seal.
w Helps insure optimum
energy efficiency while
avoiding costly air
“blow-by.”
w Ceramic construction
insures long service life.
“Simul-Shift”
Valve
w Provides an ultra-positive,
reliable shift signal that
avoids stall-out.
w Provides faster pump
trip-over with more flow.
PD0 Series
w Faster trip-over with less Cutaway
pulsation and superior for the
material flow. 3/8” and 1/2”
Models

Diaphragm Moving from Left to Right Diaphragm Moving Right to Left

A A
B B

C C

E D
D E

Diaphragm has pushed actuator pin (B) and Simul-Shift Valve 1.) The diaphragm pushes the right Actuator Pin (B) mechanically moving the
(A) to the right. Simul-Shift Valve (A) to the left.
1.) Compressed Air (red) pneumatically holds 2.) Compressed air flows to the large side of the Simul-Shift Valve,
the Simul-Shift Valve (A) and the Major Air Valve (C) in pneumatically moving the valve to the position shown.
position. Large ends of the Simul-Shift Valve (A) and Major 3.) Compressed air also flows to the large end of the Major Air Valve (C),
Air Valve (C) are vented to exhaust. pneumatically shifting it to the left.
2.) The left Quick Dump Check (D) blocks the 4). Shift of the Major Air Valve (C) results in an air pressure differential
exhaust port. Compressed air flows around Quick Dump between the Quick Dump Checks (D&E) - causing the Quick Dump Checks
Check (D) into the left diaphragm chamber. to shift position.
3.) The right Quick Dump Check (E) lifts to 5.) The right Quick Dump Check (E) blocks the exhaust port. Compressed
open the exhaust port and allows cold, wet exhaust air air (red) flows around the Quick Dump Check into the right diaphragm
(blue) from the right diaphragm chamber to flow into the chamber.
expansion chamber, while diverting cold, wet exhaust air 6.) The left Quick Dump Check (D) lifts to open the exhaust port and allows
(blue) from the Major Air Valve. cold, wet exhaust air (blue) from the left diaphragm chamber to flow into
4). Diaphragm reverses direction (C) the expansion chamber, while diverting cold, wet exhaust air (blue) from
the Major Air Valve (C).
7.) Diaphragms reverse direction

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