?Hydraulics symbols I think might be important

Question 1

Answer 1

continuous line

flow line

Question 2

Answer 2

dashed line

pilot, drain

Question 3

Answer 3

large circle

pump, motor

Question 4

Answer 4

Small circle

Measuring Devices

Question 5

Answer 5

Diamond

Fluid conditioner (filter, separator, lubricator, heat exchanger)

Question 6

Answer 6

Spring

Question 7

Answer 7

Flow restriction

Question 8

Answer 8

Solid triangle

Direction of hydraulic flow

Question 9

Answer 9

Open triangle

Direction of pneumatic flow

Question 10

Answer 10

Fixed displacement hydraulic pump

Unidirectional

Question 11

Answer 11

Fixed displacement hydraulic pump

Bidirectional

Question 12

Answer 12

Compressor

Question 13

Answer 13

Fixed displacement hydraulic motor

unidirectional

Question 14

Answer 14

Fixed displacement hydraulic Motor

Bidirectional

Question 15

Answer 15

Rotary Actuator

(hydraulic)

Question 16

Answer 16

Single acting cylinder

Returned by external force

Question 17

Answer 17

Single acting cylinder

returned by spring or extended by spring force

Question 18

Answer 18

Directional control valve

normally CLOSED with 2 ports and 2 finite positions.

Question 19

Answer 19

Directional control valve

normally OPEN with 2 ports and 2 finite positions.