Choosing a gas solenoid valve for a gas train (burner system) is mainly about safety, compatibility, and correct sizing. In industrial combustion systems, the solenoid valve acts as a safety shut-off device, quickly stopping gas flow if the control system detects a fault or shutdown condition.

Below are the key factors engineers usually consider.

1. Gas Type (Medium Compatibility)

First confirm the type of gas used in the burner system.

Examples:

• Natural gas

• LPG / propane

• biogas

• hydrogen

The valve body and seal material must be compatible with the gas to avoid corrosion or leakage. For example:

• Brass → common for natural gas

• Stainless steel → corrosive or special gases

• NBR / FKM seals → hydrocarbons and fuels

2. Working Pressure Range

Check the minimum and maximum gas pressure in the gas train.

Selection rule:

• Valve pressure rating should be 25–50% higher than system pressure to handle pressure spikes.

Example

• Gas train pressure: 200 mbar

• Recommended valve rating: ≥300 mbar

Also determine:

• Maximum inlet pressure

• Differential pressure requirement

3. Flow Capacity (Kv or Cv)

The solenoid valve must pass enough gas for the burner capacity.

Important parameters:

• Kv / Cv value

• Valve orifice size

• Pipeline diameter (DN)

If the valve is too small:

• gas flow is restricted

• burner output becomes unstable

If it is too large:

• poor control and unstable combustion may occur.

4. Valve Type (Direct or Pilot Operated)

Direct-acting

• Works at zero pressure

• Suitable for small pipe sizes

• Faster response

Pilot-operated

• Requires pressure difference

• Better for large flow and larger DN pipelines

Industrial gas trains commonly use pilot-operated valves.

5. Valve Function (Safety Mode)

Two main options:

Normally Closed (NC) – most common

• Valve closes when power is lost

• Ensures automatic gas shut-off

Normally Open (NO)

• Used only in special applications

For burner gas trains, NC is standard for safety systems.

6. Electrical Specifications

Check compatibility with the control system:

• Coil voltage (24V DC / 110V / 220V AC)

• Power consumption

• Response time

• IP protection rating

• Explosion-proof coil (if hazardous area)

7. Certifications and Safety Standards

Gas train valves must comply with safety regulations.

Common certifications:

• CE

• DVGW

• ATEX (explosion-proof areas)

• ISO / ANSI fuel gas standards

8. Gas Train Safety Configuration

Industrial burner gas trains usually install:

• Two solenoid safety shut-off valves in series

• Gas pressure switch

• leak detection system (for large burners)

This arrangement ensures gas is completely shut off if a fault occurs.

✅ Typical selection example

💡 Simple rule used by many engineers:
Choose a gas solenoid valve based on Gas type + Pressure + Flow + Pipe size + Safety certification.

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