4 Key Aspects When Selecting Valves for Your Industrial Furnace

Valves are not just another component—they are a critical part of the safety and control system of an industrial furnace. Selecting the correct gas valves is essential for several key reasons, including:

• Operational safety: Valves are the first line of defense against gas leaks and explosions.
• Precise process control: Gas flow must be accurately regulated to maintain the correct air-to-fuel ratio.
• Regulatory compliance: Non-compliance can result in fines, shutdowns, or failed audits.

In this article, we share four key aspects you should understand when selecting the right valves for your industrial furnace.

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1. International Standards and Regulations

The standards that define which valves can be used in industrial combustion systems include:

• NFPA 86 (USA): Requires fast-acting shutoff valves in double block and bleed configurations. Leak testing and certification by organizations such as FM, UL, or CSA are mandatory.
• EN 161 (Europe): Standard for automatic gas shutoff valves, defining pressure limits, safe shutoff requirements, and CE certification.
• ISO 23553-1: Applies to automatic valves used in industrial burners, ensuring safe operation and compatibility with control systems.
• ANSI / CSA Z21: North American standards for automatic gas valves used in industrial equipment.
• UL / FM: Certifications that confirm valves meet rigorous safety and durability testing.
• IEC 61508: Defines Safety Integrity Levels (SIL) for safety-critical components in combustion systems.

These standards determine valve type (fast shutoff, leak-tested, certified), installation requirements, and testing procedures to ensure safety, reliability, and regulatory compliance.

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2. Environmental Conditions

Environmental conditions are a critical factor when selecting valves for an industrial furnace, as they directly impact safety, durability, and performance. Consider the following:

• Ambient temperature: High temperatures near the furnace can damage electric actuators or seals.
• Humidity and corrosion: Humid environments with corrosive vapors require valves with anti-corrosion protection.
• Dust and particulates: Valves with reinforced seals and protected actuators are recommended.
• Vibration and mechanical shock: Valves must withstand vibration and impacts, using robust mounting and secure connections.
• Explosive atmospheres: If combustible gases or metallic dust are present, ATEX-certified or Class I, Div. 2 equipment is required.
• Chemical exposure: Materials must be compatible with any chemicals present in the environment.

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3. Level of Automation

The level of furnace automation directly influences the type of gas valve required, as it defines how flow control and safety functions are managed:

• Manual or semi-automatic systems: Manual valves and simple automatic ON/OFF valves used for isolation and basic start/stop functions.
• Basic automated systems: Normally closed, fast-acting automatic shutoff valves integrated into the control panel to meet safety sequences.
• Highly automated systems (PLC, BMS, PID control): Modulating valves with electric or pneumatic actuators, certified for safety, with shutoff verification and position feedback.

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4. Material Compatibility with the Gas Type

Material selection directly affects valve durability, service life, and safety under extreme operating conditions. Key considerations include:

• Operating temperature
• Gas compatibility
• Corrosion resistance
• Duty cycle and wear
• Applicable standards and certifications

Selecting appropriate materials (such as stainless steel bodies and high-temperature-resistant seals) and certified valves ensures safe operation, long service life, and reduced maintenance—especially in high-temperature or aggressive environments.

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Why Is a Comprehensive Evaluation Essential When Selecting Gas Valves?

A holistic evaluation ensures safety, efficiency, compatibility, and regulatory compliance, preventing operational risks and costly failures.

• System safety: Valves are the primary protection against leaks and explosions.
• Technical compatibility: Valves must match gas type, pressure, flow rate, and furnace operating conditions.
• Environmental suitability: Temperature, humidity, dust, vibration, and corrosive atmospheres influence valve design and materials.
• Frequent cycling: Valves must withstand repeated operation without loss of tightness or reliability. A proper evaluation prevents unplanned downtime and high maintenance costs.
• Regulatory compliance and audits: International standards require certified valves (FM, UL, CE). Poor selection can lead to failed inspections, fines, or legal risks.

If you need assistance selecting the right gas valve for your industrial furnace—or require certified replacement parts—contact us for more information.Our team can help you choose the best solution for your specific process and operating conditions.

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