Introduction of Hydraulic Circuits
Modular Valve Circuit Edition

Meter-Out ControlCircuit

YUKEN KOGYO CO., LTD.

Meter-Out Control Circuit
Circuit using a Throttle and Check Modular
Valve for Meter-outThrottle and check
modular valve formeter-out

The circuit shown in Fig. 3-6 is an example of themeter-out control circuit using a modular valve. The
speed during both forward and backward
movements of the cylinder can be adjusted
separately by using the throttle and check modular
valve for meter-out and the solenoid operated
directional valve to adjust the valve openings of Aand B ports. The flow rate flowing out of thecylinder is adjusted, allowing the control of thecylinder speed while applying brakes, even under aload where the cylinder rod is pulled. In otherwords, the circuit can be used for both directions ofloads: resistance loads and self-weight loads. In
the case of self-weight loads, note that the backpressure on the cylinder outlet side may be higher
than the pump discharge pressure (Note 1)
In addition, the brake valve may be required forinertial loads.

(Note 1) See Flow Control Circuit Edition Meter-OutControl Circuit (S2002-E).
Backward

ForwardFig. 3-6

S3002-EⒸ YUKEN KOGYO CO., LTD. All Rights Reserved.

Meter-Out Control Circuit
The circuits shown in Fig. 3-7 and 3-8 areexamples of using the throttle and check modular
valve for meter-out. The speed during both forward
and backward movements of the cylinder iscontrolled by meter-out control.

Position Holding

The circuit shown in Fig. 3-7 is in combination
with the solenoid operated directional valve of all
ports blocked at the neutral point. When thesolenoid operated directional valve is in the neutral
position, the cylinder position can not be heldcompletely due to internal leakage in the solenoid
operated directional valve.
The circuit shown in Fig. 3-8 is for holding theposition in the middle of the cylinder stroke. Thecylinder position can be held by using the solenoid
operated directional valve of ABT connection in theneutral position type and combining it with the pilot
operated check valve.
The concept of the circuit relating to the position
holding is similar to that of the meter-in circuit (Note2).
Backward

ForwardFig. 3-7

S3002-E

Backward

Forward(Note 2) See Modular Valve Circuit Edition Meter-In
Control Circuit (S3001-E).

Fig. 3-8Ⓒ YUKEN KOGYO CO., LTD. All Rights Reserved.

Meter-Out Control Circuit
Position Holding and the Reducing Valve for PLine

The circuits shown on this page are meter-out
control circuits, capable of position holding in themiddle of the cylinder stroke. In addition, thepressure of the circuit can be reduced.
The circuit shown in Fig. 3-9 is an example ofadding the reducing modular valve (reducingvalve) for P-line to the meter-out control circuit for
position holding shown in Fig. 3-8. This reducingvalve regulates the pressure during both forward
and backward movements of the cylinder.
The circuit shown in Fig. 3-10 is an example ofvertically installing the cylinder. Although the load isself-weight, the speed can be controlled by themeter-out control without the cylinder running on its
own during the downward movement of thecylinder.

UpwardBackward
Fig. 3-9
S3002-E

ForwardFig. 3-10

DownwardⒸ YUKEN KOGYO CO., LTD. All Rights Reserved.

Meter-Out Control Circuit
Position Holding and the Reducing Valve for BLine

The circuit shown in Fig. 3-11 is an example ofadding the reducing modular valve (reducingvalve) for B-line to the meter-out control circuit for
position holding shown in Fig. 3-8. This reducingvalve can vary the pressure during the forward
movement of the cylinder.
When the reducing valve is installed below thethrottle and check modular valve, pressure isgenerated in the pilot line of the reducing modularvalve (reducing valve) for B-line due to the throttle
effect of the throttle and check modular valve
during the backward movement. Therefore, thereducing modular valve (reducing valve) for B-line
is operated, resulting in a lack of power output of
the cylinder and interfering with the smooth
operation.

UpwardBackward

ForwardFig. 3-11
S3002-E

The circuit shown in Fig. 3-12 is used when thepressing force is to be varied under self-weightloads during operations such as adjusting thepressure drop of rolls. In this case, the cylinder
position can not be held.

Downward
Fig. 3-12 (Pressurized)Ⓒ YUKEN KOGYO CO., LTD. All Rights Reserved.

The hydraulic circuits shown in this document are limited to typical ones.
Refer to this document when creating hydraulic circuits.
If you require assistance with hydraulic circuit considerations or any other hydraulics-related questions,please contact us.

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