Hydraulics 7&9 Flashcards
What is the function of a check valve?
Flow in one direction only.
What do cylinders convert fluid power energy into?
Straight-line mechanical energy.
What are the methods by which end caps may be attached to the cylinder body barrel?
- Threads
- Keeper rings
- Tie rods
- Welds
What type of seal must exist across a cylinder’s piston and at the rod gland?
A positive seal.
What is a popular type of rod gland seal?
Lip seal.
What is the purpose of wiper seals?
Wipe the rod clean and leave a thin layer of oil on the rod.
Name three mounting styles for cylinders.
- Flange
- Clevis
- Bolt Mounting
What type of load does ‘thrust’ refer to?
Pushed load.
What type of load does ‘tension load’ refer to?
Pulled load.
What is a single-acting cylinder?
A cylinder in which pressure is applied to the moveable element in only one direction.
What distinguishes a spring return cylinder?
A spring returns the piston assembly.
What is a ram cylinder?
A cylinder in which the moveable element is the piston rod.
What defines a double-acting cylinder?
Pressure may be alternately applied to drive the piston in either direction.
What is a single rod cylinder?
A cylinder with a piston rod extending from one end.
What is a double rod cylinder?
A cylinder with a single piston and piston rod extending from each end.
What do stroke adjusters do?
Adjust when the piston is stopped during retraction.
What are stop tubes?
A metal collar that fits over the piston rod and adjusts when the piston is stopped during extension.
What is buckling in the context of cylinders?
A thrust load causes a sudden collapse of the rod.
What does axial loading refer to?
Thrust forces on the rod.
What is the bending moment imposed on the rod due to?
Eccentric loading on torque.
What is the function of a cushion in a cylinder?
Slows speed just before the end of the stroke.
What do pneumatic motors convert?
The potential energy of compressed air into rotary mechanical energy.
Name two types of pneumatic motors.
- Piston Motor
- Vane Motor
What is the purpose of a quick exhaust valve?
Increases exhaust flow to increase rod speed.
