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.
In high-pressure and large-flow gas delivery networks, the 4 inch gas valve (DN100) acts as a primary control point. These systems require strict engineering specifications, robust seals, and rapid-response actuators to manage pressure fluctuations and isolate pipeline segments during emergencies. Whether managing municipal natural gas distribution networks or industrial chemical production pipelines, selecting the right 4-inch gas valve directly affects operational safety and compliance with international standards.
Capable of managing large volumes of natural gas, LPG, and LNG. 4-inch gas valves maintain flow control and minimize pressure drops in high-flow pipelines.
Designed to shut down gas flow during leak detection. Our valves interface with gas detection controllers to automatically close within milliseconds.
Built for hazardous industrial zones. Features explosion-proof solenoid enclosures and electrical components certified to global safety standards.
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.
Our Deyang and Chengdu production facilities integrate automated casting, CNC machining, and automated testing lines. This scale allows us to maintain stable lead times even during high production volumes.
From cast steel bodies and NBR seals to explosion-proof coils, our localized industrial supply chain reduces raw material costs and production cycle times, offering cost efficiencies for global buyers.
We provide full customization options for connection standards (ANSI, DIN, JIS), body materials (Cast Steel WCB, Stainless Steel 304/316), and voltage specifications to meet local regulatory needs.
| Technical Parameter | Standard Specification | Custom Options Available |
|---|---|---|
| Nominal Diameter | DN100 (4 Inch) | DN15 to DN300 |
| Body Material | WCB Carbon Steel / Cast Iron / Ductile Iron | Stainless Steel (SS304, SS316, SS316L) |
| Connection Type | Flanged (ANSI B16.5 Class 150, PN16, PN25) | Threaded / Welded End Connections |
| Working Pressure | 0 - 0.6 MPa (Low / Medium Pressure) | High Pressure (up to 4.0 MPa / Class 300) |
| Sealing Material | NBR (Nitrile Butadiene Rubber) / Viton | PTFE / FKM for aggressive media |
| Operating Voltage | DC24V / AC220V, Pulse Triggering | DC12V, Custom DC/AC options |
Cast iron is commonly used in low-pressure applications, such as domestic utility lines. Cast Steel (WCB) offers higher mechanical strength, impact resistance, and pressure-temperature ratings, making it suitable for industrial systems, gas storage, and transport terminals.
Our solenoid-controlled 4-inch gas valves feature pulse-trigger mechanisms. When a gas detector senses concentration levels exceeding safety thresholds, it sends a DC24V pulse to the valve. This releases the internal latch, closing the valve and stopping flow in under one second.
Exporting to Europe requires CE Marking and compliance with the Pressure Equipment Directive (PED) along with SIL Certification. North American markets typically require UL, CSA, or FM approvals for explosion-proof safety requirements.
Standard NBR seals perform well in temperatures from -15°C to 60°C. For extreme low temperatures or corrosive gases, we supply Viton or fluorocarbon seals, which maintain structural integrity and prevent leakage in harsh environments.
By using automated casting and CNC milling lines at our Deyang and Chengdu factories, we maintain control over raw material machining. Our in-house CNAS-accredited calibration laboratory tests every batch of valves to ensure they meet international performance standards, which streamlines export inspection times.
We recommend monthly operational tests (triggering closure and manual resetting) to prevent mechanical binding. Additionally, annual seal inspections and dust/moisture clearing from the explosion-proof solenoid enclosure help maintain system reliability.
