Gas Emergency Shut-off Valve | Auto Cut-off on Leak/Fire | DN15–300 | ≤1s Closing | SIL3 | Ex

Gas ESD Valve - safety device cutting gas on leaks/overpressure/fire. Normal open; closes on detector/power failure/manual - prevents explosions/fires/poisoning. For natural gas, LPG, artificial gas, CNG. Shut-off ≤1s (small) / ≤10s (DN80+). Fail-safe closed on power loss. Configs: NC, hold-NC, hold-NO. Premium WCB/LCB/SS304/316/cast iron body, corrosion-resistant trim, PTFE/NBR/EPDM gas-resistant seals - strict pressure/airtightness tests, zero leakage. Certs: ISO23551-11, UL1477, IEC61508 SIL3, Ex, IP65/67, CE, GB. DN15–300, PN25–40/Class150–300, 6300kPa, -46~+80°C. Flange/thread/welded. Visual indicator, manual reset, low-maintenance. Homes, restaurants, factories, gas stations, industrial, public. China factory, OEM/ODM.

1. Rapid Emergency Response - ≤1 Second Closing for Small Sizes: Achieves full shut-off in as fast as 1 second (depending on model/size), far exceeding manual operation speed. For small sizes (DN15–DN50), the lightweight disc and high-response actuator enable near-instantaneous closure; for DN80 and above, closing time is ≤10 seconds (adjustable via flow control orifice to prevent water hammer). This quick response minimizes the spread of gas leaks and reduces the risk of catastrophic incidents - providing critical protection when every second counts. In a gas leak scenario, the volume of gas released before isolation is directly proportional to closing time - a 1-second closure can reduce released gas volume by 90% compared to a 10-second manual valve. The rapid response also makes the valve suitable for earthquake-prone areas where seismic gas shut-off is required - combined with a seismic sensor or gas detector, the valve can isolate gas supply within seconds of an earthquake, preventing post-quake gas fires and explosions (a major cause of secondary disaster damage). The actuator is engineered for consistent closing force and speed over thousands of cycles, ensuring reliable rapid response even after long periods of inactivity (months or years between activations). Closing time is 100% verified during factory testing, with test records available for each valve.

2. Multi-Scenario Activation Modes - Automatic + Manual + Fail-Safe: Supports automatic activation (via gas detector signal, overpressure sensor, or fire temperature sensor) and manual activation (local button/lever or remote switch). It also features a fail-safe design - defaulting to a closed position in case of power loss or system failure, ensuring safety even in unexpected situations. Available in three configurations to meet diverse application needs: (a) Normally Closed (NC): spring-return closed when de-energized; power/solenoid holds valve open during normal operation. On power loss or signal, spring closes - true fail-safe. (b) Hold-type Normally Closed (hold-NC): mechanically latched in open position by a solenoid/latch mechanism; on emergency signal, latch releases and spring closes. Lower power consumption (only needs power to open/close, not to hold). Fail-safe on power loss if configured. (c) Hold-type Normally Open (hold-NO): mechanically latched open; on emergency signal, latch releases and valve closes (may be spring-assisted or gravity). Suitable for applications where continuous power is not desired but automatic closure on signal is needed. The activation modes can be combined - e.g., gas detector signal + overpressure + fire temperature + manual + power-loss fail-safe - providing multiple independent safety layers. The valve accepts both dry-contact and voltage signals from gas detectors, fire alarm panels, PLC/SIS systems, and building management systems (BMS). For residential use, it pairs with standard home gas detectors (natural gas or LPG) via relay output. For industrial SIS, it integrates with safety PLCs per IEC 61511.

3. High-Quality & Durable Construction - Zero Gas Leakage: Crafted from premium materials - WCB (carbon steel), LCB (low-temp carbon steel), 304/316 stainless steel, cast iron - with corrosion-resistant internal trim, ensuring long-term stable operation in harsh environments. The valve body undergoes strict pressure resistance and airtightness tests (100% of valves), with excellent sealing performance to prevent gas leakage even after long-term use. Non-metallic components (seals, gaskets, electrical insulation) meet gas resistance standards - resistant to natural gas, LPG, and artificial gas components (methane, propane, butane, hydrogen sulfide trace), further enhancing durability. The PTFE/NBR/EPDM gas-resistant seals provide excellent compression set resistance and low gas permeation - critical for gas service where even minor leakage can create explosive mixtures. The disc/seat interface is precision-machined for metal-to-metal or soft-seated tight shut-off (bubble-tight per API 598 / ISO 5208). The body is designed and tested per GB/T 13927 (industrial valve pressure testing) and relevant gas valve standards. LCB (low-temperature carbon steel) body option extends service to -46°C for cold climate/Arctic applications. SS304/316 bodies provide corrosion resistance for humid, coastal, or chemically aggressive environments. Cast iron bodies are a cost-effective option for low-pressure residential/commercial service. The yellow gas-industry standard exterior coating provides corrosion protection and high visibility (universal gas piping color code). All pressure-containing parts have material traceability (MTR).

4. Global Safety Certifications - ISO 23551, UL 1477, IEC 61508 SIL3, Ex, IP: Complies with international standards including ISO 23551-11:2024 (gas burners and gas appliances - safety and control devices, automatic shut-off valves), UL 1477 (gas shut-off valves for use with gas detectors and alarm systems), IEC 61508 (functional safety - SIL 3 capable), and GB standards (Chinese national gas valve standards). Certified for explosion-proof (Ex) performance per IEC 60079 (ATEX/IECEx for hazardous areas - Zone 1/Zone 2 for gas) and protection (IP) performance (IP65/IP67 - dust-tight, water-jet/immersion protected), making it suitable for hazardous locations and meeting the safety requirements of various countries and regions. The SIL 3 capability (per IEC 61508) makes the valve suitable for high-demand safety instrumented functions in industrial gas systems - where a failure to close on demand could result in catastrophic loss. SIL certification is available with third-party verification (TÜV, Exida, BV) on request. The UL 1477 certification is specifically for gas shut-off valves used with gas detectors and alarm systems - confirming compatibility and performance for residential/commercial gas detection systems. The ISO 23551-11 certification confirms compliance with European/International gas appliance safety standards. CE marking confirms conformity with European directives (Pressure Equipment Directive/PED, ATEX for explosion-proof, EMC for electrical). GB standards compliance ensures acceptance for China domestic gas projects (urban gas, residential, commercial). The combination of certifications makes the valve suitable for global projects - from North America (UL/CSA) to Europe (CE/ATEX/ISO) to Asia (GB/IEC) to the Middle East (SIL/Ex for oil & gas). Third-party inspection (BV, SGS, DNV, ABS) available on request. For hazardous area installation, the Ex-rated actuator enclosure eliminates the need for expensive purging or intrinsic safety barriers.

5. Easy Installation & Maintenance - Standard Connections, Visual Indicator, Manual Reset: Designed with standard flange or thread connections (GB/T 9113, JB/T 79 for flange; NPT, BSPT for thread; welded option) for seamless integration with existing gas pipelines. The valve features a visual position indicator (clear cap with red/green or open/closed flag) for easy status checking at a glance - operators can immediately confirm whether the valve is open or closed without electrical feedback. Manual reset functionality allows for quick recovery after an emergency - after the gas leak/fire is cleared and verified safe, the operator resets the valve via a manual button/lever (no tools required in most configurations), re-latching or re-energizing the actuator to lift the disc open. The unique bonnet design eliminates the need for frequent packing adjustments - the stem sealing system is designed for long-term zero-leakage service without periodic packing tightening, reducing maintenance costs and effort. For retrofit installations, the valve can replace existing manual gas valves using standard flange-to-flange dimensions (face-to-face per GB/T 12221 or applicable standard), minimizing piping modifications. The actuator is compact and top-mounted, requiring minimal clearance above the valve. Electrical connections use standard cable glands (Ex-rated for hazardous areas) for simple field wiring. Routine maintenance includes: visual inspection, position indicator check, periodic manual test (partial or full stroke), seal inspection/replacement, and electrical connection check. The valve supports partial stroke testing (PST) for SIS applications - allowing functional verification without full closure, reducing the need for process shutdown during proof testing. Spare parts (seals, actuator components, reset buttons, position indicators) are readily available. The low-maintenance design reduces total cost of ownership over the valve's service life.

6. Wide Application Range - DN15–DN300, PN25–PN40, -46~+80°C: Suitable for maximum working pressures from low to high (up to 6300 kPa) and nominal sizes from DN 15 to DN 300 (NPS 1/2 to NPS 12). Adapts to ambient temperatures ranging from -46°C to +80°C (-50°F to +180°F), making it ideal for both indoor and outdoor use, as well as cold and high-temperature environments. The wide size range covers everything from small residential gas meter connections (DN15/DN20) to large industrial gas pipeline headers (DN300). The pressure range (PN25–PN40 / Class 150–Class 300, up to 6300 kPa) covers standard residential/commercial gas distribution (low pressure) to high-pressure industrial gas pipelines and CNG/LPG service. The -46°C low-temperature rating (with LCB body option) makes the valve suitable for cold climate regions - Northern Europe, Russia, Canada, Northern China, Arctic installations - where standard carbon steel valves may become brittle. The +80°C ambient rating covers outdoor installations in hot climates and near heat-generating equipment. The valve is suitable for natural gas, LPG (liquefied petroleum gas), artificial gas (town gas), CNG (compressed natural gas), and other non-corrosive fuel gases. For special gas compositions (high hydrogen sulfide, biogas with moisture, syngas), consult factory for material/seal compatibility. The wide application range means one valve platform can serve residential, commercial, industrial, and public facility gas safety needs - simplifying procurement, spare parts inventory, and maintenance training across a facility or gas utility's entire network. The valve is suitable for both above-ground and (with appropriate protection) underground/buried installations (gas valve vaults). For outdoor installations, the IP65/IP67 rating and corrosion-resistant coating ensure reliable operation in rain, snow, dust, and humidity.

Gas ESD: normal - actuator holds disc open (power/latch), gas flows. Emergency - detector (leak/overpressure), fire temp, power failure, or manual → actuator releases → spring drives disc closed ≤1s (small) / ≤10s (DN80+). Fail-safe: power loss = spring closes (NC). Configs: NC (power opens), hold-NC (latch holds open, fail-safe closed), hold-NO (latch holds open). Reset: manual button/lever re-latches, lifts disc. Visual indicator shows open/closed. Body WCB/LCB/SS, PTFE/NBR/EPDM gas-resistant seals - zero leakage. Ex enclosure, IP65/67. DN15–300, PN25–40, -46~+80°C. Flange/thread/welded. SIL3 per IEC61508.

Residential Use - Homes, Apartments, High-Rises, Earthquake-Prone Areas: Ideal for homes, apartments, and high-rise residential buildings, especially in earthquake-prone areas. Works with home gas detectors (natural gas or LPG) to automatically cut off gas supply when leaks are detected, protecting families from gas poisoning and fires. In high-rise buildings, a gas leak on one floor can quickly spread to other floors via stairwells, shafts, or ventilation - rapid automatic shut-off at the meter/riser limits the leak source. In earthquake-prone regions (Japan, California, Taiwan, Western China, Turkey), seismic activity can rupture gas pipes or fittings; combined with a seismic sensor or earthquake early-warning system, the gas ESD valve automatically shuts off gas supply during/after an earthquake, preventing post-quake gas explosions - one of the leading causes of secondary disaster damage and casualties. The valve is typically installed at the gas meter outlet, main riser, or individual apartment shut-off point. The visual position indicator allows residents to quickly confirm gas status after an emergency. The manual reset (after professional inspection and leak check) restores service. For residential use, the normally-closed (NC) fail-safe configuration is standard - power loss closes the valve. The compact size (DN15–DN25) and quiet operation are suitable for indoor installation. UL 1477 certification ensures compatibility with standard residential gas detector systems. The valve provides peace of mind for families - even when no one is home, a gas leak triggers automatic shut-off before gas reaches explosive concentrations (5–15% for natural gas in air).

Commercial Use - Restaurants, Hotels, Canteens, Shopping Malls, Hospitals: Perfect for restaurants, hotels, canteens, shopping malls, hospitals, and commercial kitchens - places with high gas consumption and dense crowds. Commercial kitchens use large volumes of natural gas or LPG for cooking (woks, ovens, grills, boilers); a gas leak in a commercial kitchen can rapidly reach explosive concentrations, and the presence of open flames/ignition sources makes fire/explosion risk extremely high. The gas ESD valve, paired with kitchen gas detectors and fire alarm systems, automatically shuts off gas at the main supply when a leak or fire is detected - protecting staff, customers, and property. In hotels and shopping malls, gas service may feed multiple tenants/floors; a central gas ESD valve at the building gas service entrance provides whole-building isolation in an emergency. Hospitals use gas for sterilization, heating, and laboratory applications - automatic shut-off protects patients (many of whom may be immobile or on life support) and staff. Complies with commercial safety regulations (many jurisdictions require automatic gas shut-off valves in commercial kitchens and public assembly buildings). The hold-type configurations (hold-NC/hold-NO) may be used for commercial applications where continuous power consumption is a concern. The rapid ≤1s closing (for typical commercial sizes DN25–DN50) minimizes gas release. The Ex/IP ratings allow installation in mechanical rooms and outdoor gas meter enclosures. For restaurants, the valve can be interlocked with the kitchen fire suppression system (Ansul/Range Guard) - fire suppression activation triggers gas shut-off.

Industrial Use - Gas Power Plants, Chemical Factories, Gas Storage Stations, Pipeline Networks: Suitable for gas-fired power plants, chemical factories, gas storage stations, compressor stations, and gas pipeline networks. Withstands high pressure (up to 6300 kPa) and harsh industrial environments, ensuring the safety of workers, equipment, and the surrounding environment. Meets industrial safety codes and SIL 3 requirements for critical applications. In gas-fired power plants, ESD valves on fuel gas lines to boilers/gas turbines provide automatic isolation on turbine trip, boiler fire, or gas leak - preventing unburned gas accumulation and explosions. In chemical factories, gas feed lines to reactors, furnaces, and process units use ESD valves as part of the SIS - closing on high/low pressure, fire, or operator ESD command to prevent hazardous gas release. In gas storage stations (above-ground tanks, underground storage, LPG/CNG storage), ESD valves on inlet/outlet lines provide fire-safe isolation (fusible plug or thermal trigger) and emergency shutdown. In long-distance gas pipeline networks, ESD valves at regular intervals and major junctions isolate ruptured sections - minimizing gas release and enabling faster repair; the pressure drop rate monitoring (where configured) detects rupture faster than conventional pressure switches. The SIL 3 capability (per IEC 61508/61511) makes the valve suitable for high-demand safety functions where failure to close on demand is catastrophic. The WCB/SS bodies, wide temperature range (-46~+80°C), and Ex/IP ratings handle outdoor industrial installations. For large industrial sizes (DN100–DN300), the ≤10s closing time (with adjustable orifice for water hammer control) provides rapid isolation without damaging the pipeline.

Public Facilities - Schools, Nursing Homes, Transportation Hubs, Government Buildings: Used in schools, nursing homes, public transportation hubs (train stations, airports, bus terminals), government buildings, libraries, museums, and sports arenas - providing comprehensive gas safety protection for vulnerable groups and large crowds. In schools, gas may be used for heating, cooking (cafeterias), and laboratories; automatic shut-off protects students and staff - especially important because children may not recognize gas odor or know how to respond. In nursing homes and assisted-living facilities, many residents are elderly or have mobility impairments - they cannot evacuate quickly in a gas emergency; automatic shut-off reduces the risk of gas poisoning and fire for this vulnerable population. In transportation hubs (airports, train stations, subway stations), large crowds and complex gas systems (heating, food service, maintenance) require robust automatic gas safety; ESD valves integrated with building fire alarm/gas detection systems provide rapid isolation. In government and public buildings, gas safety is a regulatory priority - automatic ESD valves demonstrate compliance and protect public assets. The visual position indicator allows facility managers to quickly verify gas status during inspections or emergencies. The valve can be integrated with building management systems (BMS) and fire alarm panels for centralized monitoring and control. For public facilities, the fail-safe (NC) configuration is standard - any power loss or system fault results in safe gas shut-off. The wide size range (DN15–DN300) covers small service connections to main building gas headers. The low-maintenance design (no frequent packing adjustment) reduces facility management workload.

Gas Stations & Fueling Facilities - CNG/LPG Stations, Gas Regulating Stations, Gate Stations, Gas Boilers/HVAC: Specifically designed for CNG (compressed natural gas) and LPG (liquefied petroleum gas) refueling stations, gas pressure regulating stations, urban gas gate stations, gas storage and distribution facilities, gas-fired boilers, and gas HVAC systems. At CNG/LPG refueling stations, gas is stored and dispensed at high pressure - a leak or fire at the dispenser, storage tank, or compressor can escalate rapidly; the gas ESD valve on the main supply/storage outlet provides automatic emergency shut-off on gas detection, fire (fusible plug/thermal), or operator ESD command - isolating the fuel source and preventing escalation. At gas pressure regulating stations and urban gate stations, ESD valves on inlet/outlet headers protect downstream distribution networks from upstream overpressure, fire, or equipment failure. At gas-fired boiler plants and central HVAC systems, ESD valves on the fuel gas main provide automatic shut-off on boiler fire, flue gas failure, or gas leak - preventing unburned gas accumulation in the boiler/ductwork (a major explosion hazard). For CNG service (up to 6300 kPa), the high-pressure rating and SS316 body option provide compatibility with compressed natural gas. For LPG service, NBR/PTFE seals handle propane/butane. The Ex explosion-proof rating is essential for these fueling/storage facilities (hazardous area classification Zone 1/Division 1). The rapid closing and fail-safe design ensure that even if power is lost during a station emergency, the valve closes safely. For gas boiler applications, the valve can be interlocked with boiler safety controls (flame failure, high steam pressure, low water) - any boiler fault triggers gas shut-off. This application category was added to cover the extensive gas fueling and distribution infrastructure that requires dedicated gas ESD protection.

Every Gas ESD Valve: Material cert - WCB, LCB, SS, cast iron, MTR. Seal - PTFE/NBR/EPDM gas-resistant, per ISO7619, permeation test. Pressure - 100% shell 1.5×, seat 1.1× gas, zero leakage; 6300kPa test. Functional - closing ≤1s/≤10s; actuator cycle; fail-safe; detector; reset. Electrical - Ex IEC60079, IP65/67, dielectric. Connection - flange GB/T9113/JB/T79, thread NPT/BSPT. Surface - paint corrosion (salt spray), SS pickled/passivated, yellow gas coating. Marking - permanent material/size/pressure/SIL/Ex/IP/serial. Packaging - end caps, bubble wrap, cartons, actuator protection. ISO23551-11, UL1477, IEC61508 SIL3, Ex, CE. Batch traceable. Warranty.

Q1: What is a gas emergency shut-off valve, and how does it work?

A: A gas emergency shut-off valve (Gas ESD Valve) is an advanced safety device engineered to automatically cut off gas supply when dangerous conditions are detected - such as gas leaks, excessive pressure, or fire. Unlike standard manual gas valves (ball valves, plug valves) that require a person to turn a handle, the gas ESD valve operates automatically in response to signals from safety systems. Normal operation: the valve is held in the open position (by solenoid power or mechanical latch), allowing gas to flow to appliances, boilers, or process equipment. Emergency closure: when a dangerous condition is detected - (a) gas detector senses gas concentration above threshold (typically 20% of LEL - lower explosive limit), (b) overpressure sensor detects pipeline pressure above safe limit, (c) fire temperature sensor/fusible plug detects elevated temperature, (d) power failure (for fail-safe NC type), or (e) manual activation (emergency button, fire alarm pull station, remote switch) - the actuator releases, and a compressed spring drives the valve disc closed, cutting off gas flow. Closing speed: ≤1 second for small sizes (DN15–DN50), ≤10 seconds for DN80 and above (adjustable). This rapid closure minimizes the volume of gas released before isolation, preventing the gas from reaching explosive concentrations (natural gas: 5–15% in air; LPG: 2–10%) and preventing escalation to fire, explosion, or gas poisoning. After emergency: once the hazard is cleared and the system is inspected (leak check, ventilation), the valve is manually reset via a button/lever - re-latching or re-energizing the actuator to lift the disc open. The valve is suitable for natural gas, LPG, artificial gas, CNG. It is widely used in homes, restaurants, factories, gas stations, and public facilities. The key advantage over manual valves: it operates 24/7 automatically, even when no one is present, and responds in seconds - far faster than any human could detect a leak and manually close a valve. For SIS applications, it provides SIL 3 capable safety function per IEC 61508/61511.

Q2: What activation modes and configurations are available, and which should I choose?

A: Activation modes (can be used alone or in combination): (1) Automatic via gas detector: accepts dry-contact or voltage signal from gas detectors (natural gas methane, LPG propane/butane). When gas concentration exceeds the alarm threshold (typically 20% LEL pre-alarm / 50% LEL alarm), the detector relay closes and triggers valve closure. This is the most common residential/commercial mode. (2) Overpressure: built-in or external pressure sensor monitors pipeline pressure; if pressure exceeds the safe setpoint (indicating regulator failure or blockage), the valve closes. (3) Fire/temperature: fusible plug (melts at set temperature - e.g., 84°C/95°C/124°C) or thermal sensor triggers closure in a fire - operates independently of electrical systems. (4) Power failure (fail-safe): for normally-closed (NC) type, loss of electrical power causes the valve to close - safe state on power outage. (5) Manual activation: local emergency button/lever or remote switch (from control room, fire alarm panel, BMS). Three configurations: (a) Normally Closed (NC): spring-return closed when de-energized; electrical power/solenoid holds the valve open during normal operation. On power loss or emergency signal, spring closes. True fail-safe - any power loss = safe closure. Best for critical safety applications where fail-safe is mandatory. Higher power consumption (continuous power to hold open). (b) Hold-type Normally Closed (hold-NC): mechanically latched in open position by a solenoid/latch; only needs power to open (latch) and close (release). Lower power consumption (no continuous hold current). On emergency signal, latch releases and spring closes. Can be configured fail-safe on power loss (if latch releases on power loss) or non-fail-safe (latch holds through power loss). Best for applications wanting low power consumption. (c) Hold-type Normally Open (hold-NO): mechanically latched open; on emergency signal, latch releases and valve closes (spring-assisted or gravity). Does not close on power loss unless configured. Best for applications where power outage should NOT trigger closure (e.g., critical process gas that must remain flowing during brief power glitches, with backup UPS). Selection guide: (i) Residential, commercial kitchen, public building - NC (fail-safe) is standard and recommended. (ii) Remote/battery-powered sites, low-power requirements - hold-NC. (iii) Critical process where power outage must not shut gas (with UPS backup) - hold-NO, with separate gas detector/fire triggers. Always consult local gas safety codes - many jurisdictions mandate fail-safe (NC) for certain applications. The valve accepts signals from standard gas detectors, fire alarm panels, PLC/SIS, and BMS.

Q3: What are the size, pressure, temperature, material, and connection specifications?

A: Sizes: DN 15 – DN 300 (NPS 1/2" – NPS 12"), covering small residential meter connections to large industrial gas headers. Nominal Pressure: PN 25 – PN 40 (Class 150 – Class 300), up to 6300 kPa (for CNG/high-pressure service). Applicable Medium: Natural Gas, LPG (Liquefied Petroleum Gas - propane/butane), Artificial Gas (town gas/mixed gas), CNG (Compressed Natural Gas), and other non-corrosive fuel gases. For special gases (high H₂S, biogas, syngas, hydrogen), consult factory for material/seal compatibility. Operating Temperature: -46°C ~ +80°C (-50°F ~ +180°F) ambient. LCB (low-temp carbon steel) body required for service below -29°C. For ambient above +80°C (near boilers, furnaces), consult factory for high-temp option. Shut-off Time: ≤1 second for small sizes (DN15–DN50); ≤10 seconds for DN80 and above (adjustable via orifice to control water hammer). Body Materials: WCB (carbon steel, ASTM A216 - standard for most gas service), LCB (low-temp carbon steel, ASTM A352 - for -46°C cold service), 304 Stainless Steel (CF8, ASTM A351 - corrosion-resistant, humid/coastal), 316 Stainless Steel (CF8M, ASTM A351 - chloride/coastal, CNG high-pressure), Cast Iron (cost-effective for low-pressure residential/commercial). Sealing Materials: PTFE (chemical resistance, high-temp), NBR (Nitrile Rubber) (oil/gas resistant - standard for natural gas/LPG), EPDM (hot water/steam, some gas service). All seals are gas-resistant with low permeation. FKM/Viton optional for special high-temp/chemical gas. Connection Types: Flange (GB/T 9113, JB/T 79 - standard for industrial/commercial; ANSI B16.5, EN 1092-1 optional), Thread (NPT, BSPT - for small residential sizes DN15–DN50), Welded (butt-weld or socket-weld - for high-pressure/pipeline). Protection Level: IP65/IP67 (dust-tight, water-jet/immersion protected - customizable). Explosion-proof: Ex per IEC 60079 (ATEX/IECEx - Zone 1/Zone 2 for gas hazardous areas). Installation: Inline, any orientation (vertical preferred for spring-return consistency). Flow Direction: Unidirectional (marked on body). Not suitable for: Oxygen service (without special cleaning/configuration), corrosive gases incompatible with body/seal materials, temperatures outside -46~+80°C (without special configuration), pressures above rated. Always verify material and seal compatibility with your specific gas composition, pressure, temperature, and local gas code requirements.

Q4: What safety certifications apply, and is the valve suitable for hazardous areas?

A: The gas emergency shut-off valve is certified to multiple global safety standards, making it suitable for hazardous areas and international projects: (1) ISO 23551-11:2024 - "Gas burners and gas appliances - Safety and control devices - Part 11: Automatic shut-off valves." This is the key international standard for gas appliance safety shut-off valves, covering design, performance, and testing requirements. (2) UL 1477 - "Gas Shut-Off Valves for Use with Gas Detectors and Alarm Systems." Specifically certifies the valve for use with gas detection and alarm systems - common in North American residential/commercial installations. (3) IEC 61508 - "Functional safety of electrical/electronic/programmable electronic safety-related systems." The valve is SIL 3 capable - suitable for Safety Integrity Level 3 safety instrumented functions (high-demand mode) in industrial gas systems. Third-party SIL certification (TÜV, Exida, BV) available on request. (4) IEC 61511 - "Functional safety - Safety instrumented systems for the process industry sector." Application standard for SIS in process industries (chemical, oil & gas, power). (5) GB standards - Chinese national standards for gas valves (GB/T 13927 pressure testing, GB/T 12221 face-to-face, and relevant urban gas valve standards) - ensuring compliance for China domestic projects. (6) CE - European conformity, covering Pressure Equipment Directive (PED 2014/68/EU) for applicable sizes/pressures, ATEX Directive (2014/34/EU) for explosion-proof, and EMC Directive (2014/30/EU) for electrical components. (7) Explosion-proof (Ex): The actuator electrical enclosure is certified Ex per IEC 60079 (ATEX/IECEx) - suitable for Zone 1 (Class I Division 1) and Zone 2 (Class I Division 2) hazardous areas where flammable gas/air mixtures may be present. This is essential for gas stations, compressor stations, chemical plants, and industrial gas facilities. (8) IP Rating: IP65 (dust-tight, protected against water jets) or IP67 (dust-tight, protected against temporary immersion) - suitable for outdoor installations, valve vaults, and wash-down environments. (9) ISO 9001:2015 - quality management system certification for the manufacturing facility. (10) Third-party inspection: BV, SGS, DNV, ABS, Lloyd's available on request. Hazardous area suitability: Yes - with the Ex-rated actuator enclosure and IP65/67 protection, the valve can be installed in Zone 1/Zone 2 gas hazardous areas without expensive purging or intrinsic safety barriers. The electrical connections use Ex-rated cable glands. For residential/commercial non-hazardous areas (indoor kitchens, boiler rooms with adequate ventilation), the standard enclosure is sufficient. Always verify the hazardous area classification (Zone/Division, gas group, temperature class) of your installation and confirm the valve's Ex certification matches. For oxygen service or special hazardous gas (hydrogen, acetylene), additional certification/configuration may be required - consult factory.

Q5: What is the lead time, warranty, MOQ, and installation/maintenance guidance?

A: Lead Time: Standard valves (common sizes DN15–DN100, WCB body, NC configuration, standard triggers): 20–35 days from order. Custom configurations (large sizes DN150–DN300, LCB/SS body, hold-type, SIL certification, Ex/IP special, third-party inspection): 35–60 days. Sample/prototype: 15–30 days depending on configuration. Rush orders may be accommodated - contact sales. Warranty: 18 months from shipment or 12 months from installation, whichever first. Covers manufacturing defects in materials, workmanship, actuator, and electrical components under normal use and proper installation per our guidelines. Consumable parts (seals, batteries if applicable) covered for 12 months. Does not cover damage from improper installation, misuse, gas incompatibility, exceeding pressure/temperature ratings, water ingress beyond IP rating, or normal wear. For warranty claims: provide valve serial number, PO, photos, failure description, and installation details. MOQ (Minimum Order Quantity): 1 piece - sample orders accepted for evaluation and testing. For OEM/ODM custom branding/packaging: minimum 10–50 pcs depending on customization level. Payment Terms: T/T 30% deposit, 70% before shipment; L/C at sight for large orders. Packaging: End caps, bubble wrap, export cartons, wooden crates for large valves, actuator/electrical connector protection, custom packaging available. Shipping: FOB Shanghai/Ningbo, or CIF/DDP as requested. Supports express (samples), air freight, sea freight. Installation guidance: (1) Install inline with flow direction arrow on body. (2) Ensure adequate clearance above valve for actuator and manual reset (typically 200–300mm). (3) For flange connection: use appropriate gaskets (graphite spiral-wound or PTFE for gas), tighten bolts evenly in cross pattern. (4) For threaded connection: use gas-rated thread sealant (PTFE tape or pipe dope - avoid sealant entering valve interior). (5) Electrical wiring: use Ex-rated cable glands for hazardous areas; connect per wiring diagram (power, detector signal, manual reset, position feedback). (6) After installation: pressure test the pipeline, check for leaks at connections, verify valve opens/closes manually, test gas detector trigger, verify visual position indicator. (7) Initial setup: configure fail-safe mode, closing time (if adjustable), and reset procedure per manual. Maintenance guidance: (1) Routine (monthly/quarterly): visual inspection, check position indicator, verify no external damage/corrosion, check electrical connections. (2) Periodic (annually): full functional test - manually trigger closure (via test button or detector), verify closing time, reset valve, check for leaks at stem/body. For SIS applications, perform proof test per IEC 61511 (partial stroke testing or full stroke). (3) Seal replacement: every 3–5 years or if leakage detected - replace PTFE/NBR/EPDM seals and gaskets with factory spare parts. (4) Actuator: inspect solenoid/latch mechanism, clean if needed, verify electrical resistance. (5) Spare parts: seals, actuator components, reset buttons, position indicators, fuses - available from factory. The low-maintenance bonnet design (no frequent packing adjustment) reduces maintenance workload. Always use qualified gas technicians for installation and maintenance - gas work is regulated and requires certified personnel in most jurisdictions. OEM/ODM: Custom body marking, private label, custom triggers, special materials, custom packaging - our engineering team collaborates on custom designs. Contact us with your application details (gas type, size, pressure, temperature, configuration, triggers, certification needs, quantity) for a formal quotation and lead time.

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