Chapter 6 Directional Control Valve

中文 Orang indonesia

6-1 Types of directional control valves

The check valve (check valve, Check Valve) guiding the check valve (Pilot Operated Check Valve)shuttle valve(Shuttle Valve)

Fill valve (Prefill Valve) direction switching valve ( switching valve, the Position the Select Valve)

6-2 Operation mode of directional switching valve

Manually operated directional control valve operation machine direction switching valve of the hydraulic pilot directional control valve

Electromagnetic operation direction switching valve Electromagnetic and hydraulic guide direction switching valve

6-3 Application example of directional control valve

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Goto Zulie teacher teaching network gas hydraulic control practice

The main function of the directional control valve is to control the movement direction of the hydraulic actuator (driver) to achieve the predetermined action, such as forward and backward movement of the hydraulic cylinder, forward and reverse swing of the swing cylinder, forward and reverse rotation of the hydraulic motor, hydraulic pressure The system starts, stops, accelerates, decelerates, etc.

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6-1 Type of directional control valve P443 TOP

n6-1-1 check valve (check valve, Check Valve)

1. Prevent the backflow of hydraulic oil: such as the outlet of the hydraulic pump and the maintenance of the supporting force of the hydraulic cylinder

2. It has the function of maintaining the circuit pressure: the check valve uses a spring to push the valve against the valve seat. If the hydraulic oil pressure fails to overcome the spring force, it cannot pass. This pressure is about 3.5 ~ 5kg _f / cm ² , so The circuit maintains this pressure and can be used as a pilot pressure source for hydraulically operated valves.

3. Used in conjunction with other hydraulic valves: such as flow adjustment valves, sequence valves, etc. whose reverse action is to make the hydraulic oil flow freely, it can be used in conjunction with this valve.

6-1-2 guide valve (Pilot Operated the Check Valve) P445 the TOP some applications may require reverse flow of the hydraulic oil, the pilot valve can be used to achieve.

6-1-3 shuttle valve (Shuttle Valve) P447 the TOP

C = A + B

6-1-4 fill valve (Valve prefill) P448 the TOP feature: with an upper tank to make up the oil shortage in the oil of

6-1-5 Direction Select Valve (Position Select Valve) P452 TOP direction switch valve can control the flow direction of hydraulic oil, and then change the movement direction of the hydraulic cylinder or the rotation direction of the hydraulic motor, such as according to the structure to distinguish, It can be divided into:(1) rotary sliding valve and(2) sliding sliding valve.

( 1 ) Rotary slide valve TOP

This type of valve has large operating force, so it is generally used in low pressure and small capacity occasions.

( 2 ) Sliding slide valve P452 TOP

nIt is a sleeve that fixes the spool in the middle for linear movement, cooperates with the movement of the spool and the groove in the sleeve, so that hydraulic oil can flow in a predetermined direction. occasion.

6-2 Directional switching valve operation mode P455 TOP

n6-2-1 Manual operation direction switching valve

6-2-2 Mechanical operation direction switching valve P457 TOP

6-2-3 Hydraulic guide direction switching valve P457 TOP

6-2-4 Electromagnetic Operation Direction Switching Valve P460 TOP

( 1 ) Single solenoid coil, spring return solenoid valve P461 TOP

( 2 ) Double solenoid coil, spring neutral solenoid valve P462 TOP

Figure 6-29 Double solenoid coil, spring neutral solenoid valve entity diagram

( 3 ) Double solenoid coil, springless solenoid valve P462 TOP

Figure 6-30 Double solenoid coil, springless solenoid valve

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6-2-5 Electromagnetic, hydraulic pilot direction switching valve P463 TOP

Generally, the solenoid valve is directly driven by the solenoid coil to change the valve position, and the electromagnetic force is not large, so it is impossible to change the valve position of large-capacity flow. The electromagnetic and hydraulic directional control valve can improve this shortcoming.

Electromagnetic, hydraulic pilot directional control valve P465 TOP ( 1 ) Spring neutral type

Electromagnetic, hydraulic pilot directional control valve P467 TOP ( 2 ) No spring type

6-3 Application Example of Directional Control Valve P469 TOP

n( 1 ) Manual operation direction switching valve

( 2 ) Mechanical operation directional control valve P469 TOP

( 3 ) Electromagnetic operation direction switching valve P47 1 TOP

GOTO Chapter 7 Flow Control Valve

Goto Zulie teacher teaching network gas hydraulic control practice

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