Flow Control Valve

Question 1

What do flow control valves do?

Answer 1

Regulate speed of hydraulic cylinders and motors by controlling the flow rate of fluid

Question 2

What are control valves classified as?

Answer 2

Flow control is dependant on load

Flow regulating where flow is independent of load

Question 3

Restrictor control valve is unaffected by?

Answer 3

Fluid viscosity

Question 4

Orifice is affected by what?

Answer 4

Fluid viscosity

Question 5

What are needle valves designed to do?

Answer 5

Give fine control of flow in a hydraulic circuit , can be varied

Question 6

What can an orifice be used for ?

Answer 6

Flow control device, the smaller the orifice area, the smaller will be the flow rate and vice versa

Question 7

What is a uniform flow rate?

Answer 7

Flow rate is constant within an hydraulic circuit, diversion must take place to prevent a buildup of pressure

Question 8

What must a uniform flow rate have ?

Answer 8

A relief valve to divert flow back to the tank

Question 9

What are the 4 methods of controlling flow rates?

Answer 9

Meter in-controls speed of ram extension and retraction

Bleed off- controls speed of ram extension and retraction

Supply- controls speed of ram extension

Return- controls the speed of ram retraction making the lowering of a load more governable. Prevent free fall of a load

Question 10

What does a shut off valve do?

Answer 10

Is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid

Question 11

What are gate valves designed to do?

Answer 11

Fully open or closed, when fully open the typical gate valve has no obstruction in the flow path, resulting in low friction loses