1. Overview
The Festo MHE3-MS1H-3/2O-QS-6 is a compact solenoid valve from Festo’s MHE3 series, designed for fast-switching pneumatic control in automation systems.
It is a 3/2-way, normally open, monostable valve — meaning when power is off, the valve remains open, and when energized, it switches to the alternate position.
This valve is commonly used as a pilot control valve or for direct control of small pneumatic actuators, offering fast response, high reliability, and low power consumption.
The “QS-6” indicates that it is fitted with Festo’s 6 mm quick-connect fittings, allowing easy integration into air supply lines.
2. Specifications (Typical for Model 525171)
| Parameter | Description / Typical Value |
|---|---|
| Valve type | 3/2-way, normally open (monostable) |
| Function | Opens air flow when de-energized; closes when energized |
| Actuation | Solenoid, electrically operated |
| Reset type | Spring return (mechanical) |
| Nominal size | 3 mm orifice |
| Flow rate | Approx. 200 L/min at 6 bar |
| Operating pressure | –0.09 MPa to 0.8 MPa |
| Proof pressure | 1.2 MPa |
| Medium | Compressed air, filtered, lubricated or non-lubricated |
| Sealing principle | Soft-seated poppet valve |
| Mounting position | Any orientation |
| Ambient temperature | –5 °C to +60 °C |
| Media temperature | –5 °C to +60 °C |
| Electrical connection | Plug-in coil with QS-6 quick fitting |
| Voltage | 24 V DC (typical) |
| Power consumption | Around 2 W |
| Switching time | 2–3 ms typical |
| Switching frequency | Up to 200–300 Hz |
| Manual override | Momentary (non-locking) manual push override |
| Protection rating | IP65 (with correctly fitted connector) |
| Materials | Aluminum body, brass or stainless internal parts, nitrile seals |
| Weight | Approx. 100 g (varies slightly with configuration) |
Specification
Specifications (Typical for Model 525171)
| Parameter | Description / Typical Value |
|---|---|
| Valve type | 3/2-way, normally open (monostable) |
| Function | Opens air flow when de-energized; closes when energized |
| Actuation | Solenoid, electrically operated |
| Reset type | Spring return (mechanical) |
| Nominal size | 3 mm orifice |
| Flow rate | Approx. 200 L/min at 6 bar |
| Operating pressure | –0.09 MPa to 0.8 MPa |
| Proof pressure | 1.2 MPa |
| Medium | Compressed air, filtered, lubricated or non-lubricated |
| Sealing principle | Soft-seated poppet valve |
| Mounting position | Any orientation |
| Ambient temperature | –5 °C to +60 °C |
| Media temperature | –5 °C to +60 °C |
| Electrical connection | Plug-in coil with QS-6 quick fitting |
| Voltage | 24 V DC (typical) |
| Power consumption | Around 2 W |
| Switching time | 2–3 ms typical |
| Switching frequency | Up to 200–300 Hz |
| Manual override | Momentary (non-locking) manual push override |
| Protection rating | IP65 (with correctly fitted connector) |
| Materials | Aluminum body, brass or stainless internal parts, nitrile seals |
| Weight | Approx. 100 g (varies slightly with configuration) |
