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H&P test 4
Vavles
Question | Answer |
---|---|
In a hydraulic or pneumatic system a control valve ____ from the compressor to the load | directs and regulates fluid |
What is the different between an infinite position valve and a finite position valve? Infinite: Finite: | An infinite position valve can be anywhere between open and closed and can be used to modulate flow A finite position valve can be on or off and is used to allow flow or block flow |
Describe the following ports p t a b r | p- pressure supply t- tank a- to load b- from load r- exhaust/tank |
Draw a 4-way 3 position valve | [x][==][||] |
Label the ports in question 4 | a b [x][==][||] p r |
draw a solenoid | [/] |
Name 3 types of control valves | poppet valve spool valve rotary valve |
What are two common voltages used to operate solenoids? | 24v dc 120v ac |
What is the purpose of a pilot operated valve? | Using a small valve to operate a large hard to move valve |
Draw a check valve | -<o- |
What is a shuttle valve? | A type of valve which allows fluid to flow through it from one of two sources |
What is a LVDT? | Linear variable differential transformer |
What is the purpose of a needle valve? | Sets restricted flow to a valve |