ISO Hydraulic Check Valve and Pilot Control Schematic Symbols

ISO Hydraulic Schematic Symbols
Hydraulic and Pneumatic Knowledge

The following are ISO hydraulic check and pilot valve symbols commonly used on technical schematics.

Description ISO Schematic Symbol
Hydraulic Check Valve, not Spring Loaded Hydraulic Check Valve, not Spring Loaded

Hydraulic Check Valve, Spring Loaded Hydraulic Check Valve, Spring Loaded

Hydraulic Check Valve, Pilot Controlled Hydraulic Check Valve, Pilot Controlled

Hydraulic Check Valve, Pilot Controlled Opening Hydraulic Check Valve, Pilot Controlled Opening

Hydraulic Check Valve, Pilot Controlled Closing Hydraulic Check Valve, Pilot Controlled Closing

Hydraulic Check Valve, Pilot Controlled Closing Simplified

Hydraulic Check Valve, Pilot Controlled Closing Simplified

Where:

A = Work Line
B = Work Line
L = Drain Line
Z = Pilot Control