# 大乾国际贸易（海口）有限责任公司 > Daqian Valves (CHNLGVF / 中國大乾閥門) is a global industrial valve manufacturer offering a comprehensive portfolio of gate, globe, check, ball, butterfly, safety, control, and specialty valves for critical applications in oil & gas, power generation, petrochemical, water treatment, and other process industries. The company emphasizes intelligent manufacturing, international standards compliance (API, ASME, DIN, GB), and engineering-driven solutions, with a strong focus on high-temperature, high-pressure, and corrosive media services. The site targets B2B procurement and engineering professionals. Product pages often contain detailed technical specifications (materials, pressure ratings, standards) in structured HTML with bilingual content. Navigation through product series pages aggregates hundreds of individual valve models. ## Valve Product Series - [Gate Valve Series](https://www.daqianvalves.com/site-page/d44ea6222b564478.html): Browse the full range of gate valves including cast steel, forged steel, stainless steel, knife, slab, and parallel slide types, designed for isolation in high-pressure and high-temperature pipelines. - [Globe Valve Series](https://www.daqianvalves.com/site-page/0dcee1f3a1df4a08.html): Explore globe valves for throttling and flow control, available in Y-pattern, angle, bellows seal, and cryogenic configurations for petrochemical and power services. - [Check Valve Series](https://www.daqianvalves.com/site-page/5bf82d723a8d443e.html): Find swing, lift, axial flow, and dual-plate check valves to prevent backflow, with options for high-temperature, high-pressure, and corrosive media. - [Ball Valve Series](https://www.daqianvalves.com/site-page/a485f46a19ad4e43.html): Discover floating and trunnion ball valves in carbon steel, stainless steel, and exotic alloys, including fully welded and buried designs for gas transmission. - [Butterfly Valve Series](https://www.daqianvalves.com/site-page/0f7b2652ccfe4528.html): Review soft-seated and metal-seated butterfly valves, including triple-eccentric high-performance types for power plants, gas pipelines, and water systems. - [Safety Valve Series](https://www.daqianvalves.com/site-page/2056664711d0400f.html): Examine spring-loaded, pilot-operated, and high-temperature safety relief valves designed to protect pressure systems in accordance with API 526 and ASME standards. - [Regulating Valve Series](https://www.daqianvalves.com/site-page/048e7231c8404605.html): See pneumatic and electric control valves for precise flow, pressure, and temperature regulation in process automation, available with linear and rotary actuators. - [Power Station Valve Series](https://www.daqianvalves.com/site-page/75d61528b6ce4b4e.html): Access high-pressure gate, globe, check, and safety valves specifically engineered for thermal and gas-fired power plants, meeting API 600 and ASME B16.34. - [Oilfield Valve Series](https://www.daqianvalves.com/site-page/Oilfield-Valve-Series.html): View robust oilfield valves including gate valves, check valves, and double block & bleed designs for upstream oil and gas production environments. - [Corrosion-Resistant Valve Series](https://www.daqianvalves.com/site-page/220b8d6532a84430.html): Find fluorine-lined gate, globe, ball, and butterfly valves for aggressive chemical services, featuring PTFE and other fluoropolymer linings. - [Forged Steel Valve Series](https://www.daqianvalves.com/site-page/728ceab8079848f1.html): Explore forged steel gate, globe, and check valves in small bore sizes, typically for high-pressure, high-temperature applications in power and process industries. - [Needle Instrument Valve Series](https://www.daqianvalves.com/site-page/7bdd6072087642dd.html): Review precision needle valves and instrument manifolds for flow control and isolation in instrumentation and sampling systems. - [Electric Actuator Series](https://www.daqianvalves.com/site-page/79b5ea8c3a9f4009.html): Compare electric actuators for valve automation, including multi-turn and quarter-turn models with various torque and control options. - [Titanium, Nickel, Zirconium Valve Series](https://www.daqianvalves.com/site-page/597bf596f815442c.html): Investigate high-alloy valves for extreme corrosive environments, such as titanium ball valves for seawater and chemical processing. ## Project Case Studies - [DN2000-DN2800 Motorized Large Diameter Gate Valve](https://www.daqianvalves.com/dn2000-dn2800-motorized-large-diameter-gate-valve): Details the delivery of DN2000 and DN2800 motorized non-rising stem gate valves for water infrastructure, manufactured to AWWA C509/C515 and EN 1074-2 standards. - [DN600 High-Temperature Pressure Seal Check Valve for Power Plants](https://www.daqianvalves.com/dn600-high-temperature-pressure-seal-check-valve): Highlights a DN600 high-temperature check valve for power plant applications, designed per ASME B16.34 and API 602 with pressure seal bonnet. - [DN1600 Pneumatic Flanged Gate Valves with Handwheel](https://www.daqianvalves.com/dn1600-pneumatic-flanged-gate-valve): Showcases large-diameter pneumatic gate valves from DN400 to DN1600 for municipal and industrial trunk pipelines, with manual override. - [32" API Bevel Gear Globe Valves](https://www.daqianvalves.com/api-bevel-gear-operated-globe-valve-large-size-32inch): Details the successful delivery of 32", 30", and 12" API bevel gear-operated globe valves, tested to API 602 and ASME standards. - [DN400 Safety Valve](https://www.daqianvalves.com/dn400-safety-relief-valve-api526-api520): Presents a DN400 safety relief valve designed and tested per API 526 and API 520 for overpressure protection in industrial systems. ## Technical Insights & R&D - [EAC Certification Research for Russian Market](https://www.daqianvalves.com/CHNLGVFshu-zhong-guo-da-qian-fa-men-'-s-product-development-and-manufacturing-based-on-the-research-on-EAC-valve-certification-standards-in-the-Russian-language-area.html): Examines the development of valve products meeting EAC certification requirements for the Russian-speaking market. - [API Valve Quality Standards Research](https://www.daqianvalves.com/CHNLGVFshu-zhong-guo-da-qian-fa-men-'-s-product-development-and-manufacturing-based-on-the-American-Petroleum-Institute-'-s-API-valve-quality-standard-research.html): Discusses R&D practices for manufacturing high-quality valves compliant with API standards for the petroleum industry. - [Large-Diameter Triple-Eccentric Butterfly Valve R&D](https://www.daqianvalves.com/GHNLGVFshu-zhong-guo-da-qian-fa-men-’-s-R-D-and-manufacturing-of-large-diameter-triple-eccentric-metal-hard-seal-butterfly-valve-fluid-solid-coupling-vibration-characteristics-analysis-and-structural-optimization.html): Analyzes fluid-structure interaction and vibration characteristics for optimizing large-diameter triple-eccentric metal hard-seal butterfly valves. - [Research on Gas-Solid Two-Phase Flow in Gate Valves](https://www.daqianvalves.com/CHNLGVFshu-zhong-guo-da-qian-fa-men--Research-and-Solution-Strategies-on-Gas-Solid-Two-Phase-Flow-and-Wear-in-Gate-Valves.html): Investigates wear mechanisms in gate valves handling gas-solid mixtures and proposes design improvements. ## Company & Contact - [About Us](https://www.daqianvalves.com/about-us.html): Learn about Daqian Valves' company history, manufacturing capabilities, quality philosophy, and global service network. - [Valve Product Introduction](https://www.daqianvalves.com/site-page/cab3c9c0d1df4a56.html): Get an overview of the full valve product portfolio, including gate, globe, check, ball, butterfly, safety, and control valves for various industries. - [Contact Us](https://www.daqianvalves.com/news.html): Find contact details, inquiry form, and email address for valve procurement, technical support, and partnership inquiries. - [News](https://www.daqianvalves.com/site-page/f043e1dbd2274848.html): Read the latest company news, project updates, and product announcements from Daqian Valves.