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Spool type symbol<br />

2 position valve<br />

Number of<br />

positions<br />

Position<br />

holding method<br />

2<br />

Spring offset<br />

type<br />

( )<br />

Spool<br />

type symbol<br />

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Hydraulic<br />

symbols<br />

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Transient state<br />

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Solenoid operated directional valve<br />

2 positions<br />

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1<br />

No spring type<br />

with detent<br />

( )<br />

<br />

<br />

<br />

3 position valve<br />

Number of<br />

positions<br />

Position<br />

holding method<br />

Spool<br />

type symbol<br />

Hydraulic<br />

symbols<br />

Transient state<br />

When neutral position and one side position of the<br />

3 position valve are used together<br />

With reference to the 3 position valve, two types of the 2 position<br />

valve are available: the valve that uses the neutral position and<br />

sol.a excitation position of the 3 position valve (2**A) and the one<br />

that uses the neutral position and sol.b excitation position (2**B).<br />

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Number of<br />

positions<br />

Position<br />

holding method<br />

Spool<br />

type symbol<br />

Hydraulic symbols<br />

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3 positions<br />

1<br />

Spring center<br />

type<br />

<br />

2<br />

( ) <br />

2 positions<br />

( Spring offset<br />

type )<br />

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1-3

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