ASCO™ Series HV427 Gas Shutoff Valves

The ASCO Series HV426 is a line of low-temperature stainless steel fuel gas shutoff valves for commercial and industrial gas burners in harsh environments. Its DC peak-and-hold constructions offer low power consumption, and robust construction provides consistent and reliable operation. The valves have resilient soft seating for tight shutoff and require zero minimum pressure differential. Suitable for applications such as tank heaters, line heaters, incinerators and flare stacks.

• Ambient temperature range of -40° F to 125° F (-40° C to 52° C) for a wide range of applications
• Explosionproof Class I Div I enclosure standard
• Maximum operating pressure differential up to 50 psi (3.4 bar)
• Meets Automatic Gas Valves Z21.21, CSA 6.5 C/I Safety Shutoff standard
• Complies with ANSI/ISA-12.27.01.2003 single-seal requirements
• Meets the metallurgical requirements of NACE MR-0175 (DC only)
• Offered in 1/4", 3/8", 1/2", 3/4" and 1" pipe sizes
• Available in AC and DC voltages

Safety & Reliability

· Fail-Safe Design: Automatically closes during power loss to prevent gas leakage

· Dual Sealing: Primary and secondary sealing systems ensure zero leakage

· Comprehensive Certifications: Complies with global safety standards including NFPA, ISO

· Redundant Design: Configurable with redundant coils or control systems

Performance Benefits

· High Pressure Capability: Specifically designed for high-pressure gas systems with stable performance

· Fast Response: Millisecond-level shutoff time minimizes risk exposure

· Low Power Consumption: Energy-efficient design suitable for continuous operation

· Long Service Life: High-quality materials and precision manufacturing ensure long-term reliability

Installation & Maintenance Convenience

· Compact Design: Saves installation space

· Multiple Mounting Orientations: Supports horizontal or vertical installation

· Easy Maintenance: Modular design facilitates field maintenance

· Strong Compatibility: Standard interfaces for easy integration into existing systems

Cost-Effectiveness

· Reduced Insurance Costs: Certified safety equipment may lower insurance premiums

· Minimized Downtime: High reliability reduces unplanned downtime

· Extended Maintenance Intervals: Reduces maintenance frequency and costs

Industrial Combustion Systems

· Industrial Boilers: Main fuel safety shutoff for gas-fired boilers

· Process Heaters: Gas control for heaters in petrochemical and chemical industries

· Heat Treatment Equipment: Gas safety systems for metal heat treatment furnaces

· Kiln Equipment: Gas supply control for furnaces in ceramic and glass industries

Commercial Applications

· Commercial Kitchens: Emergency gas shutoff for large restaurant and hotel kitchens

· Hospital Facilities: Gas safety control for hospital steam boilers and sterilization equipment

· Educational Institutions: Gas safety management for school cafeterias and heating systems

Energy Facilities

· Gas Generator Sets: Gas supply control for backup generators

· Gas Pressure Regulation Stations: Safety shutoff systems for district regulation stations

· CNG/LNG Fueling Stations: Safety control for compressed/liquefied natural gas fueling stations

Special Applications

· Laboratory Equipment: Precise control for gas equipment in research laboratories

· Semiconductor Manufacturing: Special gas control for process equipment

· Food Processing: Gas control for food baking and drying equipment

Safety System Integration

· Fire Alarm Integration: Automatic gas shutoff linked with fire protection systems

· Gas Leak Detection: Automatic shutoff triggered by gas detectors

· Process Safety Systems: Integration into Safety Instrumented Systems (SIS)

· Building Automation: Integration with Building Management Systems (BMS)

Key Selection Parameters

· Gas Type: Natural gas, LPG, propane, specialty gases

· Operating Pressure: Maximum system working pressure

· Pipeline Size: Inlet/outlet pipe diameter

· Voltage Supply: Available voltage types on site

· Environmental Conditions: Temperature, humidity, hazardous area classification

· Certification Requirements: Required safety certification standards

Configuration Options

· Standard Models: Basic safety shutoff functionality

· With Position Feedback: Provides valve position switch signals

· Manual Reset Type: Requires manual reset after shutoff

· Explosion-Proof Models: For hazardous areas

· High-Temperature Versions: For high-temperature environments

· Special Seals: For corrosive or specialty gases

Installation Considerations

· Perform pipeline purging before installation to ensure cleanliness

· Install according to arrow direction for correct flow orientation

· Provide adequate support to avoid pipeline stress

· Ensure electrical connections comply with explosion-proof requirements (if applicable)

· Perform leakage testing after installation

Maintenance Recommendations

· Regular functional testing (recommended monthly)

· Seal performance inspection (annual)

· Clean external surfaces to prevent corrosion

· Check electrical connection integrity

· Document maintenance history and establish preventive maintenance plans

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