Module 8 Flashcards
a cylinder that can exert pneumatic force in either direction
Double-acting cylinder
a cylinder having a single piston that reciprocates, providing thrust in both directions
Double-rod (or double-end rod) cylinder
a cylinder with a power stroke in only one direction
Single-acting cylinder
a cylinder containing two pistons capable of independent motion
Two-piston cylinder
the air capacity of a control valve in relation to a cylinder
Capacity coefficient (Cv)
Pneumatic cylinders convert the pressure of compressed air into _____ motion thrust.
Straight-Line
Lubrication of an air cylinder is required to improve the _____.
Service Life
Pneumatic cylinders resemble hydraulic cylinders but do not require _____ air lines.
Return
A double-acting pneumatic cylinder can exert force in _____ direction(s).
Two
A cylinder having a power stroke in one direction only is called a(n) _____ cylinder.
Single-Acting
The retracting speed of a cylinder is usually controlled by a(n) _____ metering valve.
Exhaust Flow Control
The heads or caps of most industrial pneumatic cylinders are held in place by _____.
Tie Rods
Almost all formed piston rings or seals are made of _____ materials.
Synthetic
Noncenterline cylinder mountings create a(n) _____ loading condition in the supporting structure.
Off-Center
The movement of a pivoting cylinder must be controlled to prevent the piston rod from being _____.
Bent
Before installing a new cylinder in an existing pneumatic system, make sure the cylinder will withstand the air system _____.
Pressure
When selecting a cylinder, make sure it is large enough to move the _____.
Load
When determining the cylinder diameter needed to deliver a given force at a given air pressure, you must take into account the _____ in the pneumatic system.
Pressure Losses
When checking the pneumatic system flow capacity for a new cylinder, always check the ratings of the control valves and the _____ valves.
Regulator
When installing an air cylinder, make sure that the port size of the cylinder is the same as the port size of the _____.
Control valve
A cushioning device is used in most air systems to prevent _____.
Shock
The service life of pneumatic cylinder is improved with _____.
Lubrication
A pneumatic cylinder with lugs, feet, or side-tapped holes for mounting is classified as being _____ mounted.
Fixed, noncenterline
The major difference between pneumatic and hydraulic cylinders is the _____.
Absence of return lines
The amount of motion in a pivoting cylinder should be restricted to prevent the _____.
Piston rod from bending
A cylinder that produces work only on its extending stroke is called a _____ cylinder.
Single-acting
When you divide the volume of air needed per cylinder stroke by the amount of time one stroke takes, you are calculating _____.
Required airflow rate.
Piston retraction speed is commonly controlled by _____.
Restricted exhaust air.
When selecting a cylinder, always make sure that the cylinder ports are the same size as the _____.
Control valve ports.
Piston rings (or cups) and seals of pneumatic cylinders are usually made of _____.
Synthetic materials.
Shock can be prevented in a pneumatic cylinder by using _____.
Cushioning devices.
