Table 5 Standard Hydraulic Symbols-continued

TM 5-5420-279-23

Table 5 Standard Hydraulic Symbols (continued)

Designation

Description

Symbol

Two controlled connections, two

switch positions.

2/2-way valve

Example: operation by muscle

power

Three controlled connections, three

switch positions.

Example: operation by oil pressure.

3/2-way valve

Hand operation by oil

pressure acting against

return spring

Four controlled connections, three

switch positions.

Example: operation by oil pressure.

4/3-way valve

Hand operation with

spring centring in zero

position

Pressure limiting

Supply pressure limiting by opening

(excess pressure)

relief aperture against adjustable

valve

return force

Pressure regulating

Constant output pressure despite

(reducing) valve

variable, and higher, input pressure

Line break protection - and

Load retaining valve

secondary - valve

Appendix J Page 10