RM 358.00
Electric 3/2-way monostable on/off valve with a piston gate design. Features 24V DC operation, 2.5 to 16 bar pressure range, and G1/4 exhaust port.
The HEE-D-MIDI-24 is an electrically actuated, pilot-operated 3/2-way monostable on/off valve designed for compressed air preparation systems. Part of the Festo Classic series, it features a piston gate valve design with a soft sealing principle and a mechanical spring reset. This valve supports operating pressures between 2.5 and 16 bar and is constructed from a robust die-cast aluminum housing with NBR seals. It includes a detenting manual override for manual control and is designed for in-line installation or mounting with accessories. Note: This product is scheduled for discontinuation starting January 2027.
| Parameter | Value |
|---|---|
| Design | Piston gate valve |
| Type of actuation | Electric |
| Sealing principle | Soft |
| Exhaust-air function | Without flow control option |
| Manual override | Detenting |
| Type of reset | Mechanical spring |
| Type of piloting | Pilot actuated |
| Symbol | 00991008 |
| Valve function | 3/2-way, closed, monostable |
| Operating pressure (MPa) | 0.25 MPa ... 1.6 MPa |
| Operating pressure (bar) | 2.5 bar ... 16 bar |
| lap | Overlap |
| Duty cycle | 100% |
| Characteristic coil data | 24 V DC: 2.5 W |
| Permissible voltage fluctuations | +/- 10 % |
| Operating medium | Compressed air to ISO 8573-1:2010 [7:4:4] Inert gases |
| Note on operating and pilot medium | Lubricated operation possible (in which case lubricated operation will always be required) |
| Corrosion resistance class CRC | 2 - Moderate corrosion stress |
| Note on materials | RoHS-compliant |
| LABS (PWIS) conformity | VDMA24364-B1/B2-L |
| Media temperature | -10 °C ... 60 °C |
| Ambient temperature | -10 °C ... 60 °C |
| Type of mounting | In-line installation With accessories |
| Mounting position | optional |
| Flow direction | Non-reversible |
| Product weight | 500 g |
| Pneumatic connection, port 3 | G1/4 |
| Air purity class at output | Compressed air to ISO 8573-1:2010 [7:4:4] Inert gases |
| Electrical connection | Type C Plugs To DIN EN 175301-803 |
| Signal status display | With accessories |
| Material seals | NBR |
| Material housing | Die-cast aluminium |
Integration into the main service unit (FRL assembly) of a high-speed form-fill-seal packaging machine to manage primary air supply.
Enables remote pneumatic startup via PLC only when safety conditions are met and ensures rapid system depressurization (exhausting air to atmosphere) during stops to prevent dangerous actuator drift.
Installed at the manifold inlet of a robotic welding cell to control compressed air supply to pneumatic clamping fixtures.
Allows specific machine zones to be electrically isolated and vented for safe operator access without shutting down the entire facility's ring main, utilizing the detenting manual override for maintenance checks.
Functions as the primary safety dump valve for a pneumatic press or stamping machine circuit.
Instantly exhausts system pressure upon power failure or emergency stop (monostable spring return), removing potential energy to stop the press ram and comply with industrial safety protocols.
