Pneumatic Systems and Schematics 1 Flashcards
6 cards from real Millwright Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pneumatic Systems and Schematics 1 flashcards as text
What is the primary purpose of an air receiver tank in a pneumatic system?
Answer: To store compressed air and dampen pressure fluctuations from the compressor
The receiver tank acts as a buffer, storing a reserve of compressed air to meet demand peaks and dampening pressure pulsations produced by the compressor's pumping action, which stabilizes system pressure.
On a pneumatic schematic, what does a dashed line connecting two valve actuators typically indicate?
Answer: A pilot pressure signal used to shift the valve
In ISO schematic notation, dashed lines represent pilot pressure (control air) signal paths, distinguishing them from solid lines that carry working air pressure.
A double-acting pneumatic cylinder requires air supplied to both ports alternately. Which valve configuration is used to control it?
Answer: 5/2 directional control valve
A 5/2 valve has five ports (pressure supply, two cylinder ports, and two exhaust ports) and two positions, allowing pressurized air to be directed to either side of a double-acting cylinder while simultaneously exhausting the opposite side.
What is the effect of excessive back pressure at the exhaust port of a pneumatic actuator?
Answer: It reduces the pressure differential across the piston, slowing actuator movement
Actuator speed and force depend on the pressure differential across the piston. Excessive back pressure on the exhaust side reduces this differential, robbing the actuator of speed and effective force output.
Which component in a pneumatic circuit is used to control the speed of a cylinder's extend stroke only, without affecting its retract speed?
Answer: A meter-out flow control valve on the cap-end exhaust port
A meter-out flow control valve restricts the exhaust leaving the cap-end (blind end) during extension, throttling the outgoing air and controlling extension speed without affecting the return stroke, which exhausts through the rod-end port instead.
What does the symbol of a triangle pointing toward a line on a pneumatic schematic represent?
Answer: The direction of airflow or a check valve permitting flow in one direction only
In ISO 1219 pneumatic symbology, a solid triangle indicates the direction of flow, and when used at a valve seat symbol, it represents a check valve that allows flow only in the direction the triangle points, blocking reverse flow.