hydraulic valve part B Flashcards
what is the simplest type of directional control valve
a check valve
why are rotary spool valves limited to low pressures and flow rates
higher internal leakage
what is the most common used type of directional control valve
sliding spool valve , can handle high pressure with low leakage
what are the metering notches cut into a sliding spool valve called
feathering notches
two position directional control valves are called
diverter valves
what are the types of directional control valves
open center closed port , open center open port , closed center open port , open center closed port
what is another name for open center open port directional control valve center
motor spool or float center
what is another name for closed center open port
motor or float spool
the most commonly used directional control actuation methods are
mechanical ( lever , foot pedal , push button ) pilot operated ( hydraulic or air ) electrical ( solenoid )
electrical valve actuations offers
a more economical method of remotely controlling a directional control valve
can electric actuation generate as much force as pilot
no . that’s why some manufactures use electric over hydraulic pilot actuations
what is a directional control detent
a device that holds the directional control valve in position
what are the two types of detent controls
mechanical , electrical
most common method of mechanical detent holding
balls springs and a detent notch
load check valves
prevent suspended loads from momentarily dropping
