Hydraulics Pressure Control Valves Quiz Flashcards
(19 cards)
What are Sequence Valves used for?
Casuing 1 operation to occur before another.
What are the characteristics of Sequence Valves?
•Normally Non Passing
•In 1
•Out 2
•3 port vented back to tank
•Requires check valve for back flow
How is a Sequence Valve set?
PSI, using pressure gauge
What are Counter Balance Valves used for?
Control flow from the vertical cylinder to prevent drift and cavitation. (Pressure controlled flow control valve)
What are the characteristics of a Counterbalance Valve?
•Normally Non Passing
•In 1
•Out 2
•3 goes to rod end of cylinder
How is a Counterbalance Valve set?
Adjusted while observing cylinder drift.
What are Simple Relief Valves for?
System pressure relief valve which allows flow back to tank once a certain pressure is achieved.
What are the characteristics of a Simple Relief Valve?
•Normally Non Passing
•In 1, tee into system
•Out to tank from 2
How are Simple Pressure Relief Valves set?
Set using pressure gauge, adjusting the gauge, and the pump displacement on an adjustable pump.
What are Pressure Reducing Valves used for?
Used to reduce downstream pressure in order to soften the pressure exerted by a cylinder or other hydraulic device.
What are the characteristics of Pressure Reducing Valves?
•Normally Passing
•In 2
•Out 1
•3 port connected back to tank
How are Pressure Reducing Valves set?
Adjusting the knob while using a pressure gauge
Which valve is more precise, simple relief valve, or direct relief valve?
Simple.
Which valve is more precise, pilot operated relief valve , or direct relief valve?
Pilot operated (Far more)
Which valve is the only one which is normally passing?
Pressure Reducing
Which valve requires a check valve for back flow?
Sequence Valve
Where is a Simple Relief Valve typically placed in a system?
Directly after the pump.
Where is a Counter Balance Valve typically placed in a system?
Directly after/before the vertical cylinder.
What is required if you want to put a sequence valve in a system 2 cylinders to extend 1 at a time, but retract simultaneously?
Bypass Check Valve
