Pumps/Actuators B

Question 1

Spring Return single acting

Answer 1

• air usually

- requires a drain port

Question 2

Double acting cylinder

Answer 2

• 2 pressure points
• differential because they have equal pressure on each side of the piston, but faster on retraction because area is smaller on retraction

Question 3

Double Rod Cylinder

Answer 3

• non differential produce equal force

- can push and pull simultaneously

Question 4

Tandem cylinder

Answer 4

• high force short stroke

- two pressure ports

Question 5

Cylinder Cushion

Answer 5

-prevents mechanical shock with a needle valve (metering out) to control the last bit of extension

Question 6

Stop Tubes

Answer 6

-used to reduce side load on cylinder Rod

Question 7

Rod Support

Answer 7

• used to provide more rigidity for longer strokes

- prevents excessive cylinder deflection and buckling

Question 8

Ports

Answer 8

-recommended port is O-ring boss (ORB)

Question 9

Bleed ports

Answer 9

-a way to removed entrapped air

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Question 10

Vane Motors

Answer 10

• without centrifugal force of drive, vane motors require springs under the vanes
• displacement flow can vary by shifting of cam ring

Question 11

In line axial piston motor

Answer 11

• identical to pump except port size of inlet and exhaust are same size to allow for dual rotation
• high torque/low speed swash plate is on a greater angle

Question 12

Radial piston motor

Answer 12

-a LSHT motor used in severe service

Question 13

Cylinder Installation

Answer 13

• prevent dirt from entering the cylinder
• ensure the cylinder is accurately aligned with the load
• ensure its anchored
• fill the cylinder with system fluid and tighten the hose
• watch for hot spots which cause internal leakage on the piston ring

Question 14

Telescopic Cylinder

Answer 14

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Question 15

Torque

Answer 15

• inlet pressure
• surface area
• radius of rotation