# 大乾国际贸易（海口）有限责任公司
> China DAQIAN Valves (CHNLGVF) is an industrial valve manufacturer specializing in gate, globe, check, ball, butterfly, safety, and special alloy valves for oil and gas, power generation, petrochemical, and water treatment sectors. The company offers engineered solutions meeting API, ASME, and other international standards, with an emphasis on high-temperature, high-pressure, and large-diameter applications, supported by intelligent manufacturing and global project delivery.

The site includes detailed product specifications, project updates, and technical articles, often with bilingual content (Chinese/English). Many valves are custom-engineered for EPC projects, and the website highlights certifications like API, ASME, and EAC for international markets. Product pages typically link to series overviews, while project updates provide real-world application examples.

## Valve Series Overviews
- [Gate Valve Series](https://www.cnlgvf.com/site-page/d44ea6222b564478.html): Overview of gate valves including manual, pneumatic, electric, and gear-driven models for general industrial and high-pressure applications, with material and standard options.
- [Globe Valve Series](https://www.cnlgvf.com/site-page/0dcee1f3a1df4a08.html): Overview of globe valves designed for flow regulation and shut-off in high-pressure and high-temperature systems, covering flanged, butt-weld, and Y-pattern designs.
- [Ball Valve Series](https://www.cnlgvf.com/site-page/a485f46a19ad4e43.html): Overview of ball valves including floating, fixed, trunnion-mounted, and specialty designs for gas, liquid, and high-pressure services, with various seat materials and actuator options.
- [Butterfly Valve Series](https://www.cnlgvf.com/site-page/0f7b2652ccfe4528.html): Overview of butterfly valves featuring soft-seated, metal-seated, triple-offset, and large-diameter designs for water, gas, and corrosive media, with manual, electric, and pneumatic actuation.
- [Check Valve Series](https://www.cnlgvf.com/site-page/5bf82d723a8d443e.html): Overview of check valves including swing, lift, wafer, and dual-plate types for preventing backflow in pipelines, with materials for various temperatures and pressures.
- [Safety Valve Series](https://www.cnlgvf.com/site-page/2056664711d0400f.html): Overview of safety and relief valves including spring-loaded, pilot-operated, and high-temperature models for overpressure protection in steam, gas, and liquid services.
- [Power Station Valve Series](https://www.cnlgvf.com/site-page/75d61528b6ce4b4e.html): Overview of power plant valves (gate, globe, check, and stop) designed for main steam, feedwater, and high-temperature applications up to Class 2500, per ASME and GB standards.
- [Oilfield Valve Series](https://www.cnlgvf.com/site-page/Oilfield-Valve-Series.html): Overview of valves for oil and gas production, including special gate, ball, and check valves for wellhead, manifold, and transmission applications, often with API 6A compliance.
- [Forged Steel Valve Series](https://www.cnlgvf.com/site-page/728ceab8079848f1.html): Overview of forged steel valves (gate, globe, check) for high-pressure and high-temperature service in power plants, petrochemical, and industrial systems, typically NPS 2 and smaller.
- [Corrosion-Resistant (Preservative) Valve Series](https://www.cnlgvf.com/site-page/220b8d6532a84430.html): Overview of valves with fluoropolymer lining and special coatings for highly corrosive media, including lined ball, plug, gate, and globe valves for chemical and acid services.
- [Bellows Valve Series](https://www.cnlgvf.com/site-page/6f6bfb0485d540ba.html): Overview of bellows-sealed globe and gate valves designed for zero-leakage stem sealing in toxic, dangerous, or high-purity media, complying with low-emission standards.
- [Regulating Valve Series](https://www.cnlgvf.com/site-page/048e7231c8404605.html): Overview of control and regulating valves, including pneumatic, electric, and self-operated models for precise flow, pressure, and temperature control in process industries.
- [Needle Instrument Valve Series](https://www.cnlgvf.com/site-page/7bdd6072087642dd.html): Overview of needle valves and instrument manifolds for precise flow metering and isolation in instrumentation, sampling, and hydraulic systems, available in various materials.
- [Copper Valve Series](https://www.cnlgvf.com/site-page/b0cdffcc76f94ff8.html): Overview of copper valves (gate, globe, ball, check) for plumbing, HVAC, and low-pressure industrial applications, offering corrosion resistance and easy installation.
- [Titanium, Nickel, Zirconium Valve Series](https://www.cnlgvf.com/site-page/597bf596f815442c.html): Overview of high-alloy valves made from titanium, nickel, and zirconium for extreme corrosion resistance in chemical processing, seawater, and nuclear applications.
- [Slab & Knife Gate Valve Series](https://www.cnlgvf.com/site-page/a98e2c2b5b834956.html): Overview of slab and knife gate valves for heavy-duty isolation in pulp & paper, mining, wastewater, and oil sands, including manual, pneumatic, and electric drives.
- [Water Power Control Valve Series](https://www.cnlgvf.com/site-page/168738d8e3f54ab6.html): Overview of hydraulic control valves for water supply systems, including pressure reducing, level control, and pump control valves with pilot-operated mechanisms.
- [Special Valve Series](https://www.cnlgvf.com/site-page/e27a0d94a37e4059.html): Overview of custom-engineered valves for unique applications such as high-temperature plug valves, sampling valves, discharge valves, and other non-standard designs.
- [Electric Actuator Series](https://www.cnlgvf.com/site-page/79b5ea8c3a9f4009.html): Overview of electric and pneumatic actuators for valve automation, including multi-turn, quarter-turn, and linear models with explosion-proof and modulating options.

## Featured Project Updates
- [DN500 Bevel Gear Pressure Seal Gate Valve for Main Steam](https://www.cnlgvf.com/dn500-pressure-seal-butt-weld-gate-valve-main-steam): Project delivery of a DN500 bevel gear-operated pressure seal butt-weld gate valve for power plant main steam, designed per ASME B16.34 and JB/T 3595.
- [DN400 Y-Pattern Pressure Seal Globe Valve for Main Steam](https://www.cnlgvf.com/dn400-y-pattern-pressure-seal-butt-weld-globe-valve-main-steam): Delivery of a DN400 Y-pattern pressure seal butt-weld globe valve for 1,000 MW thermal power units, suitable for main steam and hot reheat systems.
- [DN1800 Electric High-Pressure Butt-Weld Gate Valve](https://www.cnlgvf.com/power-plant-dn1800-electric-pressure-seal-gate-valve): Large-diameter DN1800 electric high-pressure butt-weld gate valve for power plant main steam and long-distance pipelines, demonstrating custom manufacturing capabilities.
- [DN600 High-Temperature Pressure Seal Check Valve for Power Plants](https://www.cnlgvf.com/dn600-high-temperature-pressure-seal-check-valve): Project update on a DN600 high-temperature and high-pressure self-sealing check valve designed per ASME B16.34, API 602, and DL/T 531 for power plant applications.
- [Power Plant Valve Procurement Guide for EPC Projects](https://www.cnlgvf.com/epc-valve-procurement-guide): Guide covering risk control, AVL qualification, and lifecycle reliability assessment for EPC valve procurement in power, petrochemical, and energy projects.
- [Research on Gas-Solid Two-Phase Flow and Wear in Gate Valves](https://www.cnlgvf.com/CHNLGVFshu-zhong-guo-da-qian-fa-men-%20Research%20and%20Solution%20Strategies%20on%20Gas-Solid%20Two-Phase%20Flow%20and%20Wear%20in%20Gate%20Valves.html): Technical article presenting research and solutions on erosion wear in gate valves under gas-solid two-phase flow conditions, relevant for oil and gas pipelines.

## Company Information
- [About Us](https://www.cnlgvf.com/about-us.html): Company introduction detailing DAQIAN Valves' mission, manufacturing philosophy, global market presence, and commitment to intelligent manufacturing and quality.
- [Contact Us](https://www.cnlgvf.com/news.html): Contact page providing email and inquiry form for valve pricing, technical support, and cooperation opportunities with DAQIAN Valves.
- [Home](https://www.cnlgvf.com): Main landing page showcasing the full range of DAQIAN industrial valves, latest project updates, and quick links to product series.
- [News](https://www.cnlgvf.com/site-page/f043e1dbd2274848.html): News listing page with company announcements, project deliveries, and technical articles on valve engineering and manufacturing.