Selecting an industrial gas solenoid valve for a gas train is mainly about safety, compatibility, and correct sizing. In combustion systems, the solenoid valve is a critical safety shut-off device, so the selection must follow both engineering logic and safety standards.

Here’s a clear, practical selection guide 👇

1. Understand the role in a gas train

In a typical gas train:

• Solenoid valves are automatic shut-off valves

• Usually installed in series (double safety valves)

• They close instantly on fault (flame failure, power loss, etc.)

👉 So the valve must be fail-safe, fast-acting, and certified for gas use

2. Key selection parameters

(1) Gas type (medium compatibility)

• Natural gas, LPG, biogas, hydrogen, etc.

• Ensure:

  • Seal material compatibility

  • Body material suitability (brass, aluminum, stainless steel)

👉 Example:

• Hydrogen → avoid copper alloys

• Corrosive gas → stainless steel

(2) Pressure rating (very important ⚠️)

• Valve max pressure ≥ 1.25–1.5 × system pressure

• Check:

  • Inlet pressure

  • Differential pressure

  • Shut-off pressure capability

👉 Wrong pressure selection = leakage or failure

(3) Flow capacity (Kv / Cv sizing)

• Must match burner demand

• Undersized valve → pressure drop, poor combustion

• Oversized valve → unstable control

👉 Always calculate:

• Required gas flow (Nm³/h)

• Pressure drop across valve

(4) Valve type (working principle)

Direct-acting

• Works at 0 pressure

• Small flow systems

Pilot-operated

• Requires pressure difference

• Better for large flow / gas train systems

👉 Most industrial gas trains use pilot-operated valves

(5) Function (fail-safe mode)

Normally Closed (NC) ✅ (most common)

• Closes when power is lost

• Used for safety shut-off

Normally Open (NO)

• Rare in gas trains

• Used only in special processes

👉 Gas systems almost always use NC valves for safety

(6) Pipe size & connection

• Match pipeline DN size

• Connection types:

  • Threaded (small sizes)

  • Flanged (DN50+)

(7) Temperature conditions

Check both:

• Gas temperature

• Ambient temperature

Typical:

• Standard: −20°C to 80°C

• High-temp burners → special seals required

(8) Electrical specifications

• Voltage: 24V DC, 110V/230V AC

• Frequency

• Power consumption

• IP protection (IP65+ recommended)

👉 For hazardous areas:

• Explosion-proof coil (ATEX)

(9) Safety standards & certifications 🚨

For industrial gas trains, this is non-negotiable:

• CE / PED (Europe)

• ATEX (explosive zones)

• DVGW (gas approval in Germany)

• SIL / IEC 61508 (for safety systems)

👉 Without certification → not acceptable for industrial burners

(10) Switching performance

• Fast closing time (milliseconds)

• High cycle life

• Stable repeatability

👉 Critical for:

• Emergency shutdown

• Burner sequencing

3. Special requirements for gas trains

Double safety valves

• Always use 2 solenoid valves in series

• Often combined with:

  • Valve proving system (leak test)

Optional features

• Position feedback switch

• Manual reset

• Soft opening (to avoid pressure shock)

4. Simple selection checklist ✅

Before choosing, confirm:

• Gas type: __________

• Max pressure: __________

• Flow rate (Nm³/h): __________

• Pipe size (DN): __________

• Voltage: __________

• Safety standard required: __________

• Hazardous area (ATEX?): Yes / No

5. Practical recommendation (engineering rule)

For most industrial burner gas trains:

• Type: Pilot-operated, Normally Closed

• Configuration: Double solenoid valves

• Certification: CE + ATEX + DVGW

• With: Valve proving system (for large systems)

6. Common mistakes to avoid ❌

• Undersizing flow capacity

• Ignoring pressure spikes

• Using non-certified valves

• Choosing NO instead of NC

• Ignoring hazardous area classification

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