Posted: September 16th, 2017
Pressure Source;
When a cylinder is required to exert some force in two directions, it is-necessary to use a
double-acting type. A four-way valve is required topper-ate double-acting cylinders. This
type of valve provides a port for each end of the cylinder, one port for-the pressure supply
line and a port for the return line carrying 011 belflg forced from the eide of the cylinder not
d r ressure. Four-way valves may have a vallety “mt-8.1.1.01“ portmg arrangements. The
un e Pmmon type of four-way valve locks the piston in pos_1t1on,pand elso blocks flow frOm
most CO when it is in center position. Another-type sometimes used 18 the open center
the_P;mrI:loads the pump when cylinder motion is not needed. Stfll another permits the
wliilzde‘: to float when the valve is in the center posxtlon.
Cy
lly accomplished by pro 6
ble’actlng cylinders 15.11011“ . . P 1‘ use of flOW.
Speed control 02d£:w.contro1valve is put inleach of the lines to the Cyllndel‘. Two types of
control vaivgzhonstrated here; metering fluld flowmg m to the cyhnder, and metering fluid
contro ar
leaving the CYlmder’
t o erating pressures, but will not prevent a load fr
Meterinu circmtspertl‘mEeISYEZn (fasted. “Meteroutn mcuits prevent uncontronedom
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