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11 Cards in this Set
- Front
- Back
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Pressure Override Equation |
Poveride= Pfull flow - Pcracking |
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Pressure reducing valve allows _____ _____ branches in _____ _____ system |
lower pressure high pressure |
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How does a pressure reducing valve operate? |
Rising pressure reduces an orifice's area, creating higher exit velocity >> lower pressure |
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Relief valve: -Senses pressure _____ -_____ attached to branch circuit -Valve normally _____ -Outlet normally at _____ pressure |
-upstream -inlet -closed -atmospheric |
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Pressure reducing valve: -Senses pressure _____ -_____ attached to branch circuit -Valve normally _____ -Outlet normally at _____ pressure |
-downstream -outlet -open -branch circuit |
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Unloading valve |
Used as a low pressure path for a pump (similar to a mechanical clutch) |
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Counterbalance valve |
Prevents a load from falling too fast |
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Brake valve |
Prevents motor from overrunning (caused by reducing fluid flow but the load wants to keep spinning at the previous speed) |
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Sequence valve |
Cylinders must operate in a certain order, rather than by lowest pressure |
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Pressure control valves are used for: |
-safety -limiting branch pressure -directing flow to low pressure -preventing excessive speeds -prevent load from overrunning -order of operations |
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What type of valve: -safety -limiting branch pressure -directing flow to low pressure -preventing excessive speeds -prevent load from overrunning -order of operations |
relief pressure reducing unloading counterbalance brake sequence |
