Explore our top-performing detection units, controller modules, and industrial solenoid valves engineered for safety and absolute reliability.
An engineering analysis of fluid dynamics, flow capabilities, and system safety integration.
In municipal gas networks, chemical pipelines, and power generation systems, the 4-inch (DN100) valve acts as a primary control junction. It balances structural resilience and flow capacity. A 4-inch valve manages significant flow volumes without generating excessive pressure drops or pipeline turbulence, making it a reliable standard in design specifications worldwide.
Choosing a 4-inch size is crucial for systems requiring high flow and safety control, such as industrial gas supply hubs. A 4-inch solenoid valve must open and close quickly, especially during emergency shutdowns. Manufacturers must ensure these valves function reliably under varying thermal conditions and corrosive environments, demanding advanced engineering and strict quality control.
Engineered internal flow paths maximize the Flow Coefficient (Cv), reducing friction loss and saving energy in high-throughput chemical and gas transmission pipelines.
Designed to operate reliably at Class 150, Class 300, PN16, and PN25 ratings. This ensures stable seals and long-term durability in high-pressure networks.
Integrates seamlessly with automatic emergency shutdown systems (ESD) and gas detection loops, certified for SIL 2 and SIL 3 safety compliance.
20+
Years Industry Experience
50+
Patents & Copyrights
10M+
Annual Production Capacity
100%
CNAS Testing Coverage
How Chinese valve suppliers combine advanced supply chains, materials engineering, and automation to deliver competitive products globally.
Chinese industrial zones house raw casting foundries, precision CNC machining shops, and seal manufacturers in close proximity. This allows Chinese factories to control material quality from raw ingots to final testing while maintaining lead times that outperform Western competitors.
Factories offer various metallurgy grades to match project requirements. Whether you require standard Carbon Steel (WCB) for dry natural gas, CF8 (SS304) or CF8M (SS316) Stainless Steel for corrosive chemicals, or Duplex Stainless Steel for offshore pipelines, our processes meet strict ASTM standards.
Top China-based suppliers feature CNAS accredited testing labs. These labs perform non-destructive testing (NDT), helium leak testing, high-temperature cycle testing, and low-temperature cryogenic evaluations, ensuring each valve conforms to standards like EN 12266-1 and API 598 before shipment.
Chengdu Factory & Office - Center of Research and Safety System Development
Deyang Factory - Heavy Valve Manufacturing & High-Volume Intelligent Assembly Line
Founded in 2003, Xinhaosi is one of the most influential and trusted brands in the global gas safety industry. Over the past two decades, we have steadily built a robust and comprehensive production and service system, which integrates cutting-edge R&D, intelligent manufacturing with advanced automation equipment, digital marketing across global channels, professional after-sales support with an experienced technician team, flexible OEM/ODM services, as well as CNAS-Accredited laboratory calibration services that meet international standards.
Our diversified product portfolio covers industrial & residential gas detection & alarm systems, industrial & household gas solenoid valves, and urban gas pipeline network monitoring systems—all engineered to adapt to complex working environments and strict safety requirements. We produce and sell tens of millions of units annually, catering to a wide range of industries that demand reliable gas detection solutions, including oil & gas exploration and production, petrochemicals, urban gas distribution, automotive manufacturing, pharmaceuticals, new energy, steel production, and beverage processing.
Guided by the core mission of “Making Gas Safety Accessible Everywhere,” we consistently deliver high-performance, reliable products and customized solutions tailored to each client’s unique needs. Every item we manufacture undergoes rigorous quality control tests, and every service we provide is backed by our professional technical team, fully embodying our unwavering commitment to safeguarding gas safety across both industrial workplaces and residential environments, and striving to build a safer world with sustainable gas safety technologies.
Adhering to ISO9001 quality management system standards, Xinhaosi's core products have obtained a full range of authoritative certifications, including national compulsory Products Certification, explosion-proof certification, fire product certification, CPA measurement instrument type approval certificate, and international approvals such as CE and SIL. Additionally, Xinhaosi holds honors such as "National Quality Integrity Benchmark Enterprise", "National Quality Leading Enterprise in the Gas Alarm Industry," member of the China Fire Protection Association, and the main drafting organization for the national standard of solenoid valves, further confirming its industry influence and reputation.
In the field of intellectual property, Xinhaosi has built a robust innovation system with over 50 patents and software copyrights. These patents cover core technological areas, including a graphical monitoring system for gas detection and alarm, which enables predictive maintenance based on historical data to reduce equipment failure rates by over 30%, and a solenoid valve with flow monitoring functionality that integrates flow detection and alarm capabilities. The company also pioneered China's first networked bus-type gas leakage monitoring system and the only maximum-point gas leakage monitoring system certified by the Ministry of Public Security, demonstrating its leading position in cutting-edge technological research.
Our in-house laboratory is accredited by the China National Accreditation Service for Conformity Assessment (CNAS), recognized both domestically and internationally under the ILAC-MRA framework. It operates in accordance with ISO/IEC 17025, the international standard for testing and calibration laboratories. It provides reliable and traceable testing services for gas detection and alarm products, solenoid valves, and related safety equipment. Test reports issued by the CNAS-accredited laboratory are widely accepted by regulatory authorities, certification bodies, and customers in China and overseas, helping to ensure product quality, safety compliance, and market access.
Insights into technology and systems integration for industrial safety and process automation.
Modern plants require more than manual shut-off valves. Sourcing trends highlight demand for 4-inch smart valves equipped with sensors that monitor internal pressure, temperature, and open/close cycles in real time. These data feeds connect to IoT control platforms, helping engineers predict wear and schedule preventative maintenance before system issues arise.
With industrial regulations tightening globally, 4-inch solenoid and control valves must integrate into safety PLC loops. Meeting SIL 2 or SIL 3 standards ensures that if a hazardous gas leak is detected, the emergency shutdown valves shut off fuel lines within fractions of a second, preventing localized leaks from escalating.
Reducing fugitive emissions is a key focus for energy companies. Modern valve stem seals, bellows containment systems, and low-leak packing technologies keep gases enclosed in the line. This helps plants comply with environmental regulations and reduces product loss during transport.
How 4-inch valves serve key roles across municipal, refining, and manufacturing systems.
At urban gas regulator stations, 4-inch solenoid valves serve as main emergency safety valves. Connected to central gas leak alarm arrays, they automatically stop natural gas flow in the event of pipeline damage or line pressure drops, protecting residential areas and municipal pipelines.
Petrochemical environments demand explosion-proof electrical systems. We equip our 4-inch safety valves with explosion-proof solenoids (Ex d IIC T6). Combined with robust metal-to-metal seating, these valves control volatile organic compounds, solvents, and fuel lines safely under extreme temperatures.
Steel mills, glass manufacturers, and chemical producers use fuel-burning boilers. In these facilities, a 4-inch rapid-shutdown valve provides key safety backup, shutting down gas feed loops immediately if flame-outs occur or the furnace temperature climbs too high.
Crucial checkpoints for procurement managers, EPC contractors, and safety engineers when selecting 4-inch OEM valves.
Purchasing valves for major chemical plants or city gas networks requires thorough technical verification. To help procurement teams minimize risks and ensure reliable operation, we suggest checking the following key criteria:
Over 20 years of dedication to technical innovation, safety engineering, and reliable gas control system manufacturing.
Start Up: Established in April 2003. Launched our first generation of gas leak alarms and fire fighting products, establishing a strong foundation in the domestic industrial safety market.
Initial Scale: Started gas safety valve production and expanded into the OEM/ODM sector. Moved our main corporate headquarters to the office facility in Longtan Industrial Park to handle growing demand.
Rapid Growth: Reached 10 million units in gas detector sales. Moved to our primary Chengdu factory and completed our comprehensive sales and technical service network across China.
Leading Up: Launched our self-developed IoT platform. Expanded our product lines into automatic fire alarms, emergency lighting, and evacuation systems. Certified as a national High-Tech Enterprise.
Steady Development: Began construction on our modern Deyang manufacturing facility. Established the specialized Petrochemical and International Business Divisions, and awarded the Sichuan Provincial Technology Center title.
Embracing the Future: Deyang factory completed and fully operational. Launched advanced urban gas pipeline monitoring products, wireless detection systems, and AI-enabled smart safety valves.
Expert answers to common questions about selection, application, and compliance in industrial safety operations.
Direct-acting solenoid valves use the electrical coil's magnetic force to lift the valve disc directly. This mechanism is fast and operates at zero differential pressure, but requires significant power for larger pipe diameters like 4 inches. In contrast, pilot-operated valves utilize line pressure to actuate the main piston. They require less power and are ideal for high-pressure systems, but need a minimum differential pressure to function properly.
For sour gas applications containing hydrogen sulfide (H2S), compliance with NACE MR0175/ISO 15156 is critical to prevent sulfide stress cracking. We recommend CF8M (316 Stainless Steel) or special duplex alloys for the valve body and internal parts, combined with high-grade fluoroelastomers (FKM) or PTFE for seals, ensuring reliable performance in harsh chemical environments.
CNAS accreditation (under ISO/IEC 17025) confirms that our laboratory's equipment, procedures, and technicians comply with rigorous international standards. Tests performed here, including gas leakage tests, fire-safe testing to API 607, cycle lifetime analysis, and chemical composition checks, are recognized globally under the ILAC-MRA framework, streamlining the import and compliance process for international projects.
European projects typically require the CE mark, the Pressure Equipment Directive (PED 2014/68/EU), and ATEX certification for explosive environments. North American projects often request UL/FM approvals for fire line safety and compliance with ASME B16.34 standards. For automated safety instrumented loops, functional safety certification to IEC 61508 (SIL 2 or SIL 3) is commonly required.
We integrate smart sensors into our 4-inch valves to track stem position, operating temperature, and flow velocity. This data is transmitted back to our IoT monitoring platform via wired RS485 Modbus or wireless protocols (LoRaWAN, NB-IoT). The platform analyzes valve performance and alerts operators to abnormal conditions, enabling predictive maintenance that can reduce equipment downtime by up to 30%.
Yes, we customize our valves to match your system safety needs. Normally Closed (NC) valves open when powered and close during power failures, which is ideal for isolating hazards. Normally Open (NO) valves remain open under normal operation and close when electrical power is applied, making them suitable for ventilation bypasses or relief lines.
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