Key Differences Between Solenoid Valves
Here’s Ekgas a clear and helpful explanation of Solenoid Valve Differences — focusing on the most common ways solenoid valves differ: by operation method, function, power type, structure, and application.
🔍 Key Differences Between Solenoid Valves
1️⃣ Operating Principle
| Type | How it Works | Features | Applications |
|---|---|---|---|
| Direct-Acting | Coil directly lifts the valve plunger to open/close flow | Works at zero pressure, fast response | Small systems, low flow, vacuum |
| Pilot-Operated | Uses system pressure and pilot hole for operation | Requires minimum pressure, larger flow | HVAC, water systems, industrial pipelines |
| Semi-Direct | Combination of both types | Can work at low pressure, more flow | Versatile, better performance |
2️⃣ Function (Flow Control)
| Function | Description | Usage |
|---|---|---|
| 2-Way | Open or close fluid flow | On/off control (air, water, gas) |
| 3-Way | Switch between two outlets or exhaust | Pneumatic actuator control |
| 4-Way | Controls double-acting cylinders | Automation and pneumatic system direction |
3️⃣ Power Supply Differences
| Power Type | Features | Pros | Cons |
|---|---|---|---|
| DC (12V/24V) | Stable, lower heat | Safe, battery-friendly | Slower response |
| AC (110V/220V) | Strong magnetic force | Faster action | Generates heat & noise |
4️⃣ Normally Open (NO) vs Normally Closed (NC)
| Type | Status Without Power | Common Use |
|---|---|---|
| Normally Closed (NC) | Valve closed | Most common, safe shutdown |
| Normally Open (NO) | Valve open | Cooling, venting, continuous flow |
5️⃣ Body Material
| Material | Features | Application |
|---|---|---|
| Brass | Affordable, good durability | Air, water, oil |
| Stainless Steel (SS304/316) | Corrosion resistant | Food, gas, chemical |
| Plastic (PVC/PTFE) | Chemical resistance | Corrosive fluids, low pressure |
| Cast Iron | Strong but heavy | High-flow industrial |
6️⃣ Sealing Material (Media Compatibility)
| Seal Type | Features | Suitable Media |
|---|---|---|
| NBR | Oil resistant | Air, oil, gas |
| EPDM | Heat/water resistant | Hot water, steam |
| Viton | Chemical & heat resistant | Acid, chemical gas |
| PTFE | High chemical resistance | Aggressive chemical fluids |
7️⃣ Application Differences
| Industry | Typical Solenoid Valve |
|---|---|
| Water Treatment | Pilot-operated, stainless steel |
| Pneumatics | 3-way or 5-way, direct-acting |
| Gas Systems | Explosion-proof solenoid valve |
| Medical | Small DC low-power valve |
| HVAC | Normally closed water control valve |
📝 Summary Table
| Category | Main Options |
|---|---|
| Operation | Direct, Semi-Direct, Pilot |
| Function | 2-way, 3-way, 4-way |
| Power Type | AC, DC |
| Default State | Normally Open, Normally Closed |
| Body | Brass, SS, Plastic |
| Seal | NBR, EPDM, Viton, PTFE |
| Application | Water, Gas, Chemical, Pneumatic |
Categories
Popular tags
Latest Posts
July 28, 2025
Do you know electric actuator?
February 12, 2026
How to use an industrial gas proportional valve
February 11, 2026
How to use an industrial gas solenoid valve
February 10, 2026
How to use an industrial gas filter
February 9, 2026
How to turn on an industrial gas burner
February 7, 2026
Leave a comment