A Normally Closed (NC) Solenoid Valve is an electromechanical device designed to restrict fluid or gas flow in its de-energized state. Upon receiving an electrical signal, the electromagnetic coil generates a magnetic field, attracting the plunger against the internal spring tension, thereby opening the orifice. This operational dynamic makes NC solenoid valves the gold standard for fail-safe safety mechanisms, emergency shutdown systems (ESD), and automated process controls across a myriad of high-hazard industries.
Direct-acting valves rely solely on electromagnetic force to lift the plunger, functioning efficiently from zero-differential pressure. In contrast, pilot-operated designs utilize the system line pressure to assist in moving the diaphragm, making them ideal for high-flow, high-pressure environments.
Utilizing premium alloys like Stainless Steel (316L) and high-density Brass ensures superior corrosion resistance. The integration of high-grade elastomer seals, including FKM, NBR, and EPDM, allows the valves to withstand extreme operational temperatures and abrasive chemical media.
Designed to isolate internal electrical arcs from flammable atmospheric vapors, complying with ATEX, IECEx, and China Compulsory Certifications (CCC). Essential for petrochemical storage facilities, LNG distribution networks, and underground utilities.
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 internatinal approvals as CE, 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.
A journey of innovation, reliability, and growth in gas safety solutions since 2003.
● Established on April 17th, 2003.
● Launched the 1st generation of gas leak alarm & fire fighting products.
● Started gas safety valve production.
● Expanded OEM business and moved to the Longtan industrial park office building.
● Achieved 10 million units in gas detector sales.
● Relocated into Chengdu factory. Completed national sales & service network.
● Launched self-developed IoT safety platform.
● Qualified as an official supplier of China's top 5 gas groups. High-Tech Enterprise Certificate.
● Commenced Deyang factory construction.
● Established Petrochemical Division. Awarded Sichuan Provincial Technology Center.
● Deyang factory online. Launched urban gas monitoring, wireless detectors, and AI safety valves.
Procuring normally closed solenoid valves on an industrial scale requires a rigorous alignment with global engineering specifications. Procurement directors in multinational chemical corporations, heavy machinery OEMs, and engineering, procurement, and construction (EPC) companies require valves that minimize down-time, satisfy localized environmental laws, and offer failsafe longevity. Our production line targets these stringent standards directly by providing custom solutions for specific pressure differentials, flow rates, and safety zones.
| Specification Parameter | Direct-Acting Series | Pilot-Operated Series | Intelligent Valve Series (AI) |
|---|---|---|---|
| Operating Pressure Range | 0 to 10 Bar (0 - 145 PSI) | 0.5 to 40 Bar (7.2 - 580 PSI) | 0 to 16 Bar (Smart-Modulated) |
| Response Time (Closure) | < 20 Milliseconds | 50 to 500 Milliseconds | Configurable (Anti-Water Hammer) |
| Medium Compatibility | Natural Gas, Air, Light Oils, Water | High Flow Fuel Gas, Corrosive Liquid | Natural Gas, Hydrogen-Blends, LPG |
| Available Core Materials | Brass, Stainless Steel 304 | Stainless Steel 316L, Forged Brass | Stainless Steel 316L |
| Safety Certifications | CE, RoHS, CCC | SIL 3, Ex d IIC T6, ATEX, IECEx | SIL 3, Ex d IIC T6, IoT Smart Hub |
Modern environmental benchmarks demand low carbon footprints. Our solenoid coils are engineered for high-duty continuous operation utilizing energy-saving electronic modules that reduce holding current by up to 60%, minimizing thermal stress and maximizing coil life.
With the shift towards green energy, our materials testing division is actively validating NBR and FKM compositions against hydrogen gas permeation, positioning our products as the core isolation mechanism for the next generation of gas grids.
Every commercial application presents unique spatial constraints and environmental dynamics. We provide customized manifold systems, customized electrical connection types (DIN plug, leaded wires, junction box), and specific KV flow factors to match mechanical envelopes.
Normally closed solenoid valves are not standalone apparatus; they constitute the physical muscle of integrated industrial architectures. When a sensor detects gas accumulation, the safety controller immediately commands the solenoid valve to interrupt the gas line. Our system design integrates with multiple gas monitoring nodes to deliver absolute structural protection.
In hazardous oilfields and refinery environments, high-performance explosion-proof gas detectors constantly monitor combustible concentrations. At the moment a leak is sensed, the system triggers the heavy-duty NC solenoid valves to isolate pressure zones instantly, preventing catastrophic ignition.
Our low-voltage battery-operated gas solenoid valves offer a smart safeguard for high-rise commercial structures and residential complexes. Connected directly to local alarms, they lock tight within milliseconds if a carbon monoxide or natural gas hazard occurs.
In blast furnaces, automotive welding plants, and pharmaceutical production sites, our networked bus-type system reports operational metrics back to central SCADA systems, ensuring preventative actions are initiated before thresholds are breached.
Technical considerations and guidelines for installing, designing, and operating Normally Closed Solenoid Valves.
