Hydraulic Valves A Flashcards
Relieves maximum pressure in a system in case of an overload
maximum pressure valve
Relives all pressure under normal operation
unloading valve
relief valve to handle small flows, accurate control of pressure is not important, quick acting
direct acting or simple relief valve
the difference between full flow pressure and cracking pressure
pressure overide
what is the pressure override if cracking pressure and full flow pressure is the same
0
relief valve for pressures above 500 psi, energy effiecient by minimizing pressure override, 20 psi light spring
pilot operated relief valve
unloading valve used in accumulator circuits
unloading relief valve
unloading valve installed in pressure line from the accumulator can serve to unload the system when the pump is shut down
on/off valve
unloading valves provides a means of unloading hydraulic system from remote location
vented relief valve
unloading valve used in high and low volume pump system. both pumps work to clamp workpiece and low pump maintains flow to develop high pressure for clamping
pilot operated unloading valve
valve used when one needs to operate only one branch of a circuit below the setting of the maximum pressure relief valve
pressure reducing valve
the sequence valve needs to be set higher or lower than the clamping pressure
lower
the sequence valve needs to be set higher or lower then the second cylinder
higher
drain type on counterbalance valve
internal
drain type on sequence valve
external
