Explore our range of high-performance gas safety instrumentation, controllers, and industrial solenoid valves certified for hazardous locations.
Solenoid valves act as critical actuators in automated system control. Selecting the correct solenoid valve sizing is crucial to achieving optimal flow rate control, avoiding excessive pressure drop, and ensuring the safety of industrial pipelines. Port diameter, internal orifice dimensions, and flow coefficient (Cv/Kv values) directly determine whether a valve can handle specific media flow rates under target pressure drop thresholds.
Under-sizing a valve creates restrictive bottlenecks, triggering system inefficiency and premature coil failure due to excess load. Conversely, choosing an over-sized solenoid leads to high procurement costs, sluggish activation times, and risk of chatter due to insufficient pressure differential. As a specialized OEM manufacturer, we provide customized sizing matrices tailored to specific medium viscosity, pressure levels, and fluid velocities.
To accurately calculate the appropriate valve dimensions, engineers rely on precise formulas integrating flow coefficient parameters:
Chengdu Factory & Office
Deyang Factory
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.
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.
Review the standardized dimensions, pressure limits, and seal compatibilities for default gas safety and control applications.
| Nominal Size (DN) | Orifice Diameter (mm) | Pipe Thread (NPT/G) | Flow Coefficient (Kv m³/h) | Max Pressure (Bar) | Body Material Options | Applicable Media |
|---|---|---|---|---|---|---|
| DN15 | 15.0 | 1/2" | 4.5 | 0.5 - 10 | Brass / Stainless Steel | Natural Gas, LPG, Air, Water |
| DN20 | 20.0 | 3/4" | 7.6 | 0.5 - 10 | Brass / Stainless Steel | Natural Gas, LPG, Air, Water |
| DN25 | 25.0 | 1" | 11.0 | 0.5 - 6.0 | Brass / Cast Aluminum | Natural Gas, Manufactured Gas |
| DN32 | 32.0 | 1-1/4" | 18.0 | 0.5 - 6.0 | Cast Aluminum / Alloy | Non-corrosive Gases, Air |
| DN40 | 40.0 | 1-1/2" | 27.0 | 0-4.0 | Cast Aluminum / Brass | Gaseous Fuels, Dry Air |
| DN50 | 50.0 | 2" | 40.0 | 0-4.0 | Cast Aluminum / Alloy | Town Gas, Combustible Gases |
| DN65 | 65.0 | Flanged DN65 | 68.0 | 0-2.0 | Ductile Iron / Aluminum | Pipeline Industrial Gas |
| DN80 | 80.0 | Flanged DN80 | 95.0 | 0-2.0 | Ductile Iron / Aluminum | Low-pressure Industrial Gas |
Our Deyang and Chengdu factories are strategically situated adjacent to major metallurgical and industrial clusters. This local proximity gives us direct access to high-grade virgin brass, premium aluminum alloys, specialized seal materials (Viton, NBR, EPDM), and electromagnetic steel. Minimizing transit times for raw materials enables us to maintain robust production schedules, absorb market volatility, and guarantee stable unit pricing for high-volume international buyers.
Xinhaosi features fully integrated manufacturing capabilities, including CNC precision machining shops, automatic coil winding workstations, and state-of-the-art leak testing lines. Maintaining in-house controls over critical assembly procedures ensures high dimensional consistency across custom solenoid valve sizes. Automation drives down production errors, achieves tight tolerances, and delivers significant cost savings that we pass directly to our partners.
Whether you require custom connection types (such as special threads or bespoke flanges), customized voltage ratings, or unique coil enclosures for highly corrosive offshore environments, our engineering division has you covered. With a deep bench of professional designers and an ISO/IEC 17025 certified laboratory, we fast-track prototypes from concept to production-ready units while securing CE, SIL, and explosion-proof compliance.
Navigating global safety rules requires strict adherence to localized directives. Our entire solenoid valve family is engineered and validated to satisfy major international regulatory frameworks:
For multinational gas utilities and engineering procurement companies, sourcing is only the first step. Xinhaosi backs up manufacturing with global technical support and local integration solutions:
Review the implementation standards for sizing and selecting solenoid systems across various demanding operating environments.
In municipal gas networks, high flow volumes require large-sized solenoid valves (e.g., DN50 to DN100) that operate with minimal pressure drop. The valves function as safety interlocks that trip during seismic events or sudden overpressure conditions. Integrated flow sensors and monitoring systems enable operations teams to execute predictive maintenance and identify minor gas leaks before they escalate into emergencies.
Petrochemical refining handles high temperature, high pressure, and corrosive fluids. In these settings, explosion-proof solenoid valves with stainless steel housings and Viton or PTFE seals are standard. Sizing calculations must account for the density and viscosity of the process fluids to prevent cavitation and ensure the valve opens or closes within safety timing window limits.
For homes and multi-family developments, safety systems require compact, cost-effective solutions. Typically, a DN15 or DN20 aluminum or brass solenoid valve is installed at the main gas entry point. The valve is wired directly to a household combustible gas detector. If the detector senses methane or LPG, it outputs a pulse signal that triggers the valve to shut off the gas supply, preventing potential fires or explosions.
To choose the correct size, you need to calculate the flow coefficient (Cv or Kv) based on inlet pressure, allowable pressure drop, gas density, and the maximum volumetric flow rate of the system. Once calculated, match this value with a valve size that has a rated Cv/Kv higher than the target, ensuring it operates within limits without restricting flow.
Line size refers to the connection thread or flange dimension (e.g., a 1/2" NPT or DN15 connection). Orifice size refers to the internal opening diameter through which the gas flows. A valve with a larger line size can have a smaller internal orifice to restrict flow or regulate pressure, so checking both dimensions is necessary.
Pilot-operated solenoid valves use the fluid pressure in the pipeline to help actuate the internal diaphragm or piston. If the pressure difference between the inlet and outlet is too low, the valve will not open or close fully. In low-pressure systems, direct-acting or direct-lift solenoid valves are used instead because they do not require a minimum pressure drop to function.
Seal materials must be chemically compatible with the medium and matched to the system operating temperature. NBR is suitable for standard fuel gases at moderate temperatures. Viton (FKM) offers better resistance to high temperatures and corrosive chemicals, while PTFE is preferred for cryogenic applications or aggressive media.
Browse our selection of transmitters, monitors, household gas alarms, and advanced solenoid valves for industrial gas control applications.
