Pressure build-up valves HEL
Classic
The Festo HEL pressure build-up valves bring system pressure up in a controlled and delayed manner after switch-on. In pneumatic systems where cylinders or valves must remain in a defined position when depressurised, the HEL prevents uncontrolled movements on restart. The range is available in 13 versions with port sizes from G 1/8 to G 1.
Controlled pressure build-up - throttled switching prevents pressure peaks and uncontrolled actuator movements
Port sizes G 1/8 to G 1 - MINI (1/8, 1/4, 3/8), MIDI (3/8, 1/2, 3/4), MAXI (3/4, 1, 1/2)
Manual handwheel - operable without auxiliary energy, for safe manual release
Classic system design - direct mounting in Classic-range compressed air preparation groups
| Type | Port size | Frame size |
|---|---|---|
| HEL-1/8-D-MINI (165076) | G 1/8 | MINI |
| HEL-1/4-D-MINI (165077) | G 1/4 | MINI |
| HEL-3/8-D-MINI (165078) | G 3/8 | MINI |
| HEL-3/8-D-MIDI (165079) | G 3/8 | MIDI |
| HEL-1/2-D-MIDI (165080) | G 1/2 | MIDI |
| HEL-3/4-D-MIDI (165081) | G 3/4 | MIDI |
| HEL-3/4-D-MAXI (165082) | G 3/4 | MAXI |
| HEL-1-D-MAXI (165083) | G 1 | MAXI |
| HEL-1/2-D-MAXI (186522) | G 1/2 | MAXI |
Typical applications: Restart of pneumatic systems after emergency stop or pressure drop, protection of handling systems and grippers against uncontrolled movements on start-up, installation in compressed air distributions with safety requirements in robotics and automotive assembly, and combined use with HE/HEE in service units with soft-start function.
