Hydraulics Pumps & Valves by Hindustan Hydraulics & Pneumatics Chennai
Hydraulics Valves
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Transcript of Hydraulics Valves
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Telescopic cylinderTelescopic cylinder
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Check valveCheck valve
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Check valve circuitCheck valve circuit
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Pilot operated check valvePilot operated check valve
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Shuttle valveShuttle valve
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Pressure control valvePressure control valve
Relief valve Relief valve Reducing valveReducing valveUnloading valveUnloading valve
Sequence valveSequence valve
Counter balance valveCounter balance valve
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Pressure relief valvePressure relief valve
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Guided poppet design/Differential Guided poppet design/Differential piston piston
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Explode view Pilot operated PR Explode view Pilot operated PR valvevalve
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Open / Closed position pilot Open / Closed position pilot operated PRoperated PR
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Used of PRUsed of PR
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Construction Pilot operated PRConstruction Pilot operated PR
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Compound /pilot operated pressure Compound /pilot operated pressure relief valverelief valve
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Remote piloting/multiple pre. selectionRemote piloting/multiple pre. selection
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Venting Pilot operated PRVenting Pilot operated PR
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ValvesValvesDirectly operated pressure reducing valveDirectly operated pressure reducing valve
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ValvesValvesDirectly operated pressure reducing valveDirectly operated pressure reducing valve
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Direct operated pre. Reducing valveDirect operated pre. Reducing valve
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ValvesValvesDirectly operated pressure reducing valveDirectly operated pressure reducing valve
1 - állító elem, 2 - vezérlő vezeték, 3 - nyomórugó,4 - vezérlő tolattyú, 5 - vezető él,6 - rugótányér + résolaj vezeték Y,7 - visszacsapó szelep, 8 - mérőpont
5 – governing edge
6 – spring plate and leakage line
7 – check valve
8 – measuring point
1 – adjusting element
2 – governing line
3 – spring
4 – governing spool
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Pressure reduction valve circuitsPressure reduction valve circuits
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Pilot operated reduction valvePilot operated reduction valve
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Multifunction pressure controlMultifunction pressure control
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Uses of multifunction pre. Control valveUses of multifunction pre. Control valve
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BiBi--directionaldirectional pressure regulationpressure regulation circuit circuit
(a)
1 12
(b)
23 3
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MultiMulti--pressure regulation circuitpressure regulation circuit
(a)
2
3
1
2 3
4
1
(b) (c )
to sy
stem to
syst
em
to sy
stem
BiBi--stage pressure regulation circuit and multistage pressure regulation circuit and multi--stage stage pressure regulation circuit can reduce overflow power loss.pressure regulation circuit can reduce overflow power loss.
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SequenceSequence valvesvalves
Sequence valves cause a hydraulic system to operate in a pressure sequence.
They are used to control the order of various actuators of a hydraulic system.
As soon as the inlet pressure reaches a preset pressure value, the sequence valve will open and let oil pass to a secondary circuit.
Sequence valves have two types—direct-acting and pilot-operated.
They can also be classified as internal control and externalcontrol types according to where the control pressure is from.
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Sequence valve circuitSequence valve circuit
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Sequence valveSequence valve
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PressurePressure ControlControl ValvesValves
(a) (b) (c) (d)
One-way sequence valve and counterbalance valve
(a) One-way internal control sequence valve (b) One-way external control sequence valve(c) One-way internal control counterbalance valve(d) One-way external control counterbalance valve
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Counter balance circuitCounter balance circuit
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Counter balance circuitCounter balance circuit
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Unloading valveUnloading valve
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SummarySummary
No.No. Pressure Pressure valvevalve
Measure and Measure and control quantity control quantity
Outlet Outlet port to port to
leakageleakage symbolsymbol
11 Pressure Pressure relief relief
Inlet pressure Inlet pressure tanktank to have no to have no drain portdrain port
22 Unloading Unloading valvevalve
Pilot pressurePilot pressure tanktank to have no to have no drain portdrain port
33 Pressure Pressure reducing reducing valvevalve
Outlet pressureOutlet pressure actuatoractuator to have a to have a drain portdrain port
44 Sequence Sequence valvevalve
Inlet/pilot Inlet/pilot pressurepressure
actuatoractuator to have a to have a drain portdrain port
55 CounterbaCounterbalance lance
Inlet/pilot Inlet/pilot pressurepressure
tanktank to have no to have no drain portdrain port
66 Pressure Pressure switchswitch
Inlet port Inlet port pressurepressure
T
p pK
T
K
T
p
P2
1P
L
P2
LLP1 P1
K
P2
P P
K
T T