Selecting a gas solenoid valve for a gas train is not just about size or price—it’s primarily about safety compliance, correct flow capacity, and matching your burner/control logic. Below is a practical, engineering-focused guide (the way EKGAS and burner OEMs usually do it), plus real product examples for reference.

1) Core selection criteria (most important first)

✅ 1. Safety standard (NON-NEGOTIABLE)

• Must comply with EN 161 (Class A) for automatic shut-off valves in gas systems

• For Europe (like Germany), also consider:

  • EN 746-2 (industrial thermoprocess safety)

  • CE / ATEX if explosive environment

👉 Why it matters:
Gas solenoid valves are safety shut-off devices, closing instantly on failure to prevent leaks

✅ 2. Valve function type

Choose based on burner sequence:

• Normally Closed (NC) → standard safety valve (recommended)

• Normally Open (NO) → for special vent/relief use

• Single-stage / double-stage

• Fast opening vs slow opening

  • Fast: simple ON/OFF burners

  • Slow opening: avoids ignition shock

Example:

• EKGAS series offers:

  • Fast/fast, slow/fast, adjustable flow versions

✅ 3. Flow capacity (VERY critical)

You must match:

• Max gas flow (Nm³/h)

• Pressure drop (ΔP)

• Kv value

👉 Rule of thumb:

• Oversized → unstable control

• Undersized → pressure loss, poor combustion

✅ 4. Pressure range

Typical industrial gas trains:

• 20–360 mbar (common)

• Some up to 500 mbar or higher

Match:

• Inlet pressure (P1)

• Outlet pressure (P2)

✅ 5. Pipe size (DN selection)

Typical mapping:

• DN15–DN25 → small burners

• DN40–DN80 → medium

• DN100+ → large furnaces

Example:

• EKGAS series: DN10–DN65 available

✅ 6. Opening/closing time

• Closing time: <1 second (safety requirement)

• Opening:

  • Fast: <1 s

  • Slow: adjustable (0.5–30 s)

✅ 7. Redundancy (very important for gas trains)

• Use double solenoid valves (two in series)

• Or integrated solutions (e.g., EKGAS)

👉 Reason:

• Provides double safety shut-off

✅ 8. Electrical specs

• Voltage: 230V AC (EU standard), 24V optional

• Coil protection: IP54 / IP65

• Consider:

  • Continuous duty (ED 100%)

  • Replaceable coil

✅ 9. Gas compatibility

Ensure compatibility with:

• Natural gas

• LPG / propane

• Biogas (if needed)

✅ 10. Environment & installation

Check:

• Ambient temperature (-15°C to +60°C typical)

• ATEX if hazardous area

• Mounting orientation

• Vibration resistance

2) Typical industrial-grade valve examples

Industrial standard DN25–DN50 valves

• Different DN sizes (DN25–DN50)

• Voltage options (12V / 24V / 230V)

• Normally open vs closed configurations

⚠️ Note: These are general-purpose valves. For gas trains, always prioritize certified brands (below).

3) Recommended industrial brands (real-world)

From combustion industry practice:

Tier 1 (very reliable)

• EKGAS 

✔ High safety, EN161 compliance
✔ Widely used in burners & furnaces

Tier 2

• Kromschröder

• Brahma

• Madas

• Parker / Bürkert

Example (industrial integrated solution)

• DUNGS MultiBloc:

  • Combines filter + regulator + 2 valves + pressure switch

  • Reduces piping and improves safety

4) Product comparison table (example DN25–DN50 class)

5) Practical selection workflow (engineer approach)

Follow this sequence:

1. Define gas type + flow rate (Nm³/h)

2. Confirm inlet pressure range

3. Calculate required Kv

4. Select:

   • DN size

   • Double valve configuration

5. Choose:

   • Opening type (fast/slow)

   • Voltage

6. Verify:

   • EN161 compliance

   • Brand reliability

7. Add:

   • Valve proving system (if required)

6) Common mistakes (avoid these)

❌ Choosing by pipe size only
❌ Ignoring pressure drop
❌ Using non-certified valves
❌ Using single valve instead of double safety
❌ Wrong opening speed (causes ignition failure)

Bottom line

A “good” gas solenoid valve for a gas train is one that:

• Meets EN161 safety standard

• Matches flow + pressure precisely

• Uses double safety shut-off

• Comes from a reputable combustion brand (EKGAS/ MADAS/DUNGS / Honeywell / Siemens)

Phone: +86 185 6630 3837
WhatsApp: +86 185 66303837
Email: ekelairn@gmail.com
Web.: http://ekgas.com