Detailed Explanation of VQ7-6-FPG-D-3N Solenoid Valve Product
2025-07-101. Product Overview
VQ7-6-FPG-D-3N is a pilot-operated solenoid valve produced by SMC (or similar brands). It features a 5-port 2-position (5/2) or 3-port 2-position (3/2) structure, which is used to control the directional switching action of pneumatic actuators (such as cylinders and pneumatic motors).
Typical applications:
- Automated equipment (manipulators, assembly lines, packaging machines)
- Industrial machinery (presses, auxiliary control for injection molding machines)
- Medical and food equipment (meeting the requirements of oil-free and corrosion resistance)
2. Core Features
✅ Pilot-operated structure: low power consumption (0.5~1.2W) and fast response (switching time ≤20ms)
✅ Multiple passage diameter options: 6mm passage diameter (Cv value is about 1.2), balancing flow rate and compactness
✅ Dust and water resistance: protection class IP65 (suitable for dusty and humid environments)
✅ Various voltage options: DC24V / AC220V ( -3N may represent the voltage model)
✅ Manual override: some models are equipped with manual operation function (for emergency debugging)
3. Model Interpretation (Example)
| Code Segment | Meaning |
|---|---|
| VQ7 | Series name (general series of SMC solenoid valves) |
| 6 | 6mm passage diameter |
| FPG | Pilot-operated, spring return, G-thread interface |
| D | Single solenoid controlled (double solenoid controlled is “D2”) |
| 3N | Voltage/special options (such as DC24V) |
4. Technical Parameters
| Item | Parameter |
|---|---|
| Valve body type | 5-port 2-position (5/2) or 3-port 2-position (3/2) |
| Working pressure | 0.1~0.7MPa |
| Medium | Compressed air (both oil-free and oil-mist lubrication are acceptable) |
| Response time | ≤20ms (advantage of pilot-operated type) |
| Service life | More than 5 million times (depending on the load) |
| Ambient temperature | -5℃~+50℃ (high-temperature resistant type is optional) |
5. Installation and Wiring
(1) Air Circuit Connection
- Inlet port (P): connected to the air source (needs filtering and pressure reduction treatment)
- Outlet port (A/B): connected to the cylinder or actuator
- Exhaust port (R/S): equipped with a muffler (for noise reduction)
(2) Electrical Wiring
- Voltage confirmation: -3N is usually DC24V (needs to verify the label)
- Polarity protection: DC type has positive and negative poles (no action if reversed)
- Waterproof connector: IP65 models need to seal the cable inlet
6. Selection and Alternative Suggestions
- Higher flow rate? Choose VQ10-8 (8mm passage diameter)
- Explosive environment? Choose VQ7-6-EX (with explosion-proof certification)
- Bistable type? Choose VQ7-6-FPG-D2 (double solenoid controlled, no memory function)
7. Common Fault Handling
| Problem | Possible Cause | Solution |
|---|---|---|
| No commutation | Coil burnout / Voltage mismatch | Measure coil resistance with a multimeter |
| Air leakage | Aging of valve core seal / Impurity jamming | Clean or replace the seal |
| Action delay | Blockage of pilot air circuit / Insufficient air pressure | Check that the air source pressure is ≥0.15MPa |
8. Summary
VQ7-6-FPG-D-3N is a cost-effective pilot-operated solenoid valve, suitable for small and medium flow pneumatic control scenarios. Its characteristics of low power consumption, fast response and long service life can meet most automation needs. When selecting the model, attention should be paid to:
- Matching of passage diameter and flow rate (6mm is suitable for ordinary cylinders)
- Voltage specification (specific parameters of -3N need to be confirmed)
- Environmental adaptability (choose IP65 for dusty/humid environments)
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