Chapter 5 Flow Control Valve
中文 Orang
indonesia
Types and applications of flow
control valves
Throttle (Throttle
Valve)
With Throttle-Check
Valve
Pressure
Compensated Throttle Valve
Temperature
Compensated Throttle Valve
Temperature-Pressure
Compensated
Throttle Valve)
Reduction valve (Deceleration
Valve)
A diverter valve (Divid
Flow Valve)
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The flow control valve can reduce
the flow into the hydraulic cylinder and reduce the speed of the hydraulic
cylinder. P431
The throttle valve controls
the flow rate through the throttle port based on the size of the throttle
port. As shown
in Figure 5-2
In the processing machinery,
when the cutting action is performed, the hydraulic cylinder feeds slowly.
To save time, the backward stroke is quickly retracted. To achieve this
action, a check valve can be added. As shown
in Figure 5-3 ,
the forward stroke is the same as the throttle valve, while the reverse
stroke, the check valve seat is pushed up, and the hydraulic oil quickly
bypasses (by
pass) back
to the inlet side.
(Pressure
Compensated Flow Control Valve)
the
flow rate of the throttle is proportional to the square root of the
pressure difference before and after the throttle
( 1 ) Pressure
compensation structure
( 2 ) Pressure-compensated flow
control
P435
5-1-4 temperature-compensated
flow control valve P437
(Temperature
Compensated Flow Control Valve)
Use orifice type throttle
to reduce the influence of viscosity
5-1-5 temperature
and pressure compensation type flow control valve P438
(Temperature-Pressure
Compensated Flow Control Valve)
In general processing
machinery such as drilling machines or lathes, the cutters are usually
fast-fed to save time when they are not close to the work. When the cutters
are close to the work for cutting, they should be fed slowly, otherwise the
cutters will be damaged.
Application example of reduction
valve
P439
If you want to get two hydraulic
cylinders to move synchronously ,
you can connect the inlet oil to the diverter
valve to make
the hydraulic oil flow into the two hydraulic circuits quantitatively. The
flow is distributed to each hydraulic circuit (see Figure 5-16) . If
classified according to the function of the diverter valve, it can be
divided into (1) equal
volume diverter valve ; (2) proportional
diverter valve and(3) bypass
diverter valve . Figure 5-17
shows the
application example of the equal volume diverter valve.
GO TO Chapter
6 Directional Control Valve
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