Hydraulic Valves

Question 1

Purpose of hydraulic valves

Answer 1

1. Flow
2. Direction of flow
3. Pressure

Question 2

Flow control valve

Answer 2

Directs fluid flow to or away from a component like an actuator or hydraulic motor

Question 3

Check valve

Answer 3

Allows fluid flow in one direction

Stops or restricts fluid flow in the other direction

Question 4

Orifice check valve

Answer 4

Full flow in one direction and restricted flow in the other

Question 5

Selector valve

Answer 5

Controls the direction of fluid flow to or away from an actuator port

Question 6

Types of selector valves

Answer 6

1. Spool type
2. Rotary type
3. Plug type
4. Poppet type

Question 7

Plug type closed center valve

Answer 7

Used on low pressure hydraulic systems
Uses a 4 port selector valve

Question 8

Poppet type selector valve

Answer 8

Used on high pressure systems that need a more positive shut-off

Question 9

Sequence valves

Answer 9

A valve that does not let fluid flow until another action has been completed

Question 10

Hydraulic Fuse

Answer 10

A protective device that prevents loss of fluid in case of a line rupture or major leak

Question 11

What are the two types of hydraulic fuses?

Answer 11

1. Pressure-abnormal pressure drop turns of hydraulic fuse and stops fluid flow.
2. Volume-after a specific amount of hydraulic fluid flows through the fuse, the fuse will shut off the hydraulic flow