Name Structure schematic diagram Graphic symbol
(L) 2 / 2-way valve
The two-position two-way directional valve has only two states between the two ports; on or off [see Figure 5.15 (a)]. The automatic reset type (such as spring return) two-position two-way spool valve has two functions: normally closed (O type) and normally open (H type) [see Figure 5.15 (c)]
Figure 5.15 Spool function of 2 / 2-way valve
Table 5.2 Commonly used spool valve function of three-position four-way valve
Type Symbol Status, characteristics and application of neutral port
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