In today's industrial landscape, operational reliability, environmental compliance, and safety are more than requirements — they are imperatives. KOSEN Valve Co., Ltd., headquartered in Oubei, Zhejiang, China, positions itself at the forefront of this challenge. Since its founding, KOSEN has focused on developing industrial valve solutions that combine precision engineering, material science, and process optimization, providing clients worldwide with components capable of performing under the most demanding conditions.

Industries such as oil & gas, petrochemicals, power generation, LNG, water treatment, and mining face complex operational pressures. Pipelines, reactors, and fluid systems demand valves that can withstand high pressures, extreme temperatures, corrosive media, and abrasive materials, while maintaining tight sealing and minimal leakage.

Traditional valve designs often struggle with material degradation, emission control, and automation integration, creating risks for both operational efficiency and environmental compliance. KOSEN recognized that overcoming these challenges required a holistic approach: not just better manufacturing, but advanced materials, precision engineering, and rigorous testing combined with global standards adherence.

KOSEN's approach begins with research-driven engineering. The company integrates mechanical analysis, fluid dynamics, materials science, and automation readiness to optimize valve design. Key areas of innovation include:

Advanced Materials: Selection of stainless steel, Cr–Mo alloys, duplex stainless steel, high-nickel alloys, Monel, Hastelloy C, and cryogenic steels to resist corrosion, wear, and thermal extremes.
Flow Optimization: Designing valves for minimal pressure drop, controlled turbulence, and efficient flow regulation, critical in pipelines transporting gas, oil, or chemical fluids.
Sealing and Leak Control: Development of high-performance gaskets, stem packing, and metal-seated designs to achieve fugitive emission reduction and tight shutoff performance.
Automation Integration: Pneumatic and electric actuation compatibility ensures valves can operate in automated process control systems, supporting Industry 4.0 standards.

Through these innovations, KOSEN addresses long-term operational reliability, environmental protection, and industrial safety, making its valves suitable for critical applications worldwide.

KOSEN's product portfolio reflects its commitment to solving industrial challenges through adaptable, high-performance valves:

• Ball Valves: Floating, trunnion-mounted, top-entry, metal-seated, multi-way, and double-block & bleed (DBB) designs deliver tight shutoff, leak-proof performance, and operational flexibility, supporting both manual and automated systems.
• Gate Valves: Engineered for full-flow shutoff, KOSEN's gate valves are ideal for high-pressure pipelines where reliability under extreme conditions is essential.
• Globe Valves: Optimized for flow regulation and throttling, these valves control fluid velocity while minimizing wear on internal components.
• Butterfly Valves: Available in double or triple offset configurations, they provide large-diameter flow control with high precision and low torque operation.
• Plug Valves: Lubricated and sleeved designs support medium-flow control and rapid shutoff in corrosive or abrasive environments.
• Check Valves: Swing, wafer, axial-flow, and tilting-disc designs prevent backflow and pressure surges, safeguarding pipelines and equipment.
• Cryogenic and Specialty Valves: Designed for ultra-low temperature applications down to −196 °C, commonly used in LNG, gas processing, and low-temperature chemical operations.
• Knife Gate and Marine Valves: Ideal for abrasive slurries and marine conditions, delivering corrosion resistance and long service life.
• Pipe Strainers & Accessories: Protecting pipelines from debris and supporting system longevity and efficiency.

Each product is engineered with safety, durability, and minimal maintenance in mind, making KOSEN valves a dependable choice for mission-critical operations.

KOSEN's commitment to quality and reliability is embedded in its manufacturing philosophy. The company employs multi-stage inspection protocols to verify material integrity and functional performance:

• Material Testing: Chemical composition analysis, hardness, and impact tests ensure raw materials meet design specifications.
• Non-Destructive Testing: Ultrasonic (UT), magnetic particle (MT), and liquid penetrant (PT) testing identify internal or surface defects before assembly.
• Operational Testing: Pressure and leak tests simulate real-world pipeline conditions, validating valve performance under extreme pressure, temperature, and flow scenarios.
• Cryogenic Validation: Specialized testing ensures cryogenic valves operate reliably at ultra-low temperatures without material failure.

Certifications such as ISO 9001 and CE confirm adherence to international standards, reinforcing KOSEN's position as a trusted global supplier. These measures guarantee product consistency, long-term reliability, and regulatory compliance across all sectors.

KOSEN valves are applied in industries where failure is not an option:

• Oil & Gas: Valves provide high-pressure, high-temperature isolation, with tight shutoff for upstream, midstream, and downstream operations.
• Petrochemical & Refining: Resistant to corrosive chemicals, heat, and fluctuating pressures, ensuring safe and efficient plant operation.
• Power Generation: Steam, water, and thermal valves support fossil, renewable, and nuclear applications with high reliability under cyclic loads.
• LNG & Cryogenics: Ultra-low temperature valves are tested for leak-tight performance, minimizing operational risk in critical storage and transport systems.
• Water Treatment & Utilities: Valves optimize flow control and maintenance cycles, extending system lifespan.
• Mining & Metallurgy: Withstand abrasive slurry and high-pressure conditions, ensuring system durability and operational safety.

By tailoring solutions to each sector, KOSEN addresses technical, operational, and regulatory challenges with confidence and precision.

KOSEN emphasizes partnership with clients, not just supply:

• Technical Support: Engineers assist in valve selection, installation guidance, and troubleshooting to ensure seamless integration into systems.
• Maintenance & Lifecycle Management: Programs extend valve life and reduce downtime through preventive maintenance and spare parts supply.
• Training Programs: On-site and remote training educate engineers and technicians on operational safety, maintenance, and valve handling.
• Warranty and Reliability Assurance: An 18-month warranty ensures operational confidence and reinforces trust.

This customer-focused model positions KOSEN as a solutions partner, rather than a conventional supplier, addressing the full lifecycle of industrial fluid control systems.

Research and innovation are central to KOSEN's long-term strategy. The company continuously explores:

• Material Advancements: Use of high-performance alloys, coatings, and engineered composites to improve durability and corrosion resistance.
• Automation and Integration: Development of pneumatic and electric actuation for automated industrial systems.
• Process Simulation: Computational fluid dynamics (CFD) and finite element analysis (FEA) predict pressure, flow, and thermal stresses, informing better design decisions.
• Custom Engineering: Solutions tailored to unique industrial challenges, combining technical precision with practical usability.

Through ongoing innovation, KOSEN strengthens its ability to solve emerging industrial challenges while supporting sustainable and efficient operations.

Though headquartered in China, KOSEN serves clients worldwide, providing valves for projects in:

• Asia, Europe, North America, and the Middle East
• Large-scale petrochemical, LNG, and power generation facilities
• Critical water treatment and municipal infrastructure
• Specialty industrial and marine projects

By maintaining strict quality control, international certification compliance, and technical support, KOSEN ensures its valves meet the highest global standards, strengthening its reputation as a trusted partner in industrial fluid management.

KOSEN Valve Co., Ltd. stands as a solutions-driven industrial valve provider, committed to addressing the complex demands of modern industrial operations. Through innovative engineering, precise manufacturing, advanced material utilization, and comprehensive customer support, KOSEN delivers valves that operate reliably under extreme pressures, temperatures, and corrosive conditions.

Its extensive product range — including ball, gate, globe, butterfly, plug, check, cryogenic, and specialty valves — supports industries where safety, efficiency, and environmental compliance are critical. By combining technical expertise, quality assurance, and a customer-centric approach, KOSEN positions itself not just as a manufacturer, but as a global partner capable of solving complex fluid control challenges, driving operational excellence, and enabling industrial growth worldwide.

Magpie Valves (officially Magpie Valve Packing Gasket Co., Ltd.) is a technology‑driven industrial manufacturer headquartered in Wenzhou, Zhejiang, China, that specializes in high‑performance valve solutions, sealing systems, and related engineered products. The company has established itself as a leader in precision valve manufacturing with a particular focus on low emission technology, advanced sealing science, and rigorous performance validation.

Since its founding in 2008, Magpie Valves has steadily evolved from a conventional valve maker into a research‑oriented enterprise that bridges academic research and real‑world industrial applications. Its multidisciplinary team includes specialists in sealing engineering, materials science, mechanics, and electromechanical systems.

Magpie's corporate vision centers on redefining valve performance by addressing core technological bottlenecks in traditional valve design — especially those related to sealing integrity and non‑metallic material behavior. According to the company, while most of the global valve industry once focused primarily on machining and conventional manufacturing, the real frontier lies in deep material research and surface science to enhance long‑term reliability and sustainability.

This philosophy is crystallized in how Magpie bridges academic research with industrial production, collaborating with research institutions such as Lanzhou University of Technology's National Key Friction Laboratory, Ningbo Institute of Materials, East China University of Science and Technology, and the Shanghai Institute of Ceramics to study graphite sealing and friction/wear mechanisms at a fundamental level.

• 2008 – Founding: The company was founded with a focus on API‑standard valve manufacturing, marking its entry into the global valve industry.
• 2010 – Sealing Innovation Initiation: Responding to growing demands from clients in the U.S. market, Magpie began research into low‑leakage graphite sealing packing, a move that would shape its future technological focus.
• 2010–2019 – Academic R&D Collaboration: Over nearly a decade, Magpie partnered with leading research bodies to analyze material properties and causes of sealing failure, driving enhancements in product performance.
• 2019 – First API 622 Certification: The company obtained TÜV‑witnessed API 622 certification (for low emission stem packing performance), a significant milestone that validated its technology at the international level.
• 2019–2024 – Expanded Certifications: With continued third‑party testing by TÜV SÜD and TÜV Rheinland, Magpie earned additional certifications including API 624, ISO 15848‑1, TA‑LUFT, and API 641, ensuring consistent performance across valve types and operating conditions.
• 2025 – ISO 15848‑1 CC3 Certification: Under TÜV Rheinland's witness, the company gained the advanced ISO 15848‑1 CC3 certification, confirming its leadership in low‑leakage valve technology.

Magpie's competitive edge stems from its emphasis on precision engineering and sealing performance — especially in low‑emission environments. The company has invested heavily in understanding the mechanical behavior of non‑metallic materials, surface coating technologies for sealing components, and friction and wear mechanisms, which it identifies as the key determinants of long‑term valve performance.

Its internal R&D and engineering teams integrate disciplines including:

• Nuclear‑grade sealing and packing engineering
• Advanced material science and nanotechnology
• Thermal and cryogenic performance design
• Mechanical and frictional behavior analysis
• Third‑party validated performance testing

Magpie's technical approach emphasizes scientific analysis, iterative product validation, and close collaboration between design and manufacturing functions. This enables consistent delivery of products that not only meet but often exceed industry standards for sealing and operational reliability.

Magpie Valves offers a diversified product range engineered for low emission performance, complex operating conditions, and critical safety‑oriented applications. Its major product categories include:

Designed to maintain ultra‑low fugitive emissions, these products use specialized packing, mid‑seat gaskets, and stem seal solutions to minimize leakage of gases or harmful media. They are applicable in environments with strict safety and environmental regulations.

Magpie manufactures a range of valve types, including:

• Cryogenic Floating Ball Valves – engineered for extreme low‑temperature environments (down to −196 °C).
• Pneumatic Control Valves – suited for automated control systems with high accuracy and reliability.
• Gate and Globe Valves – customized for various pressure classes and industrial standards.

Advanced graphite components such as M800 combined packing and high‑purity graphite gaskets are engineered for dynamic applications requiring extremely low leakage and long service life.

Complementary pump solutions designed to work in tandem with Magpie valve products for fluid handling, transfer, and control applications.

Magpie's commitment to quality is underscored by its achievement of industry‑recognized certifications that validate product performance across multiple standards:

• API 622: stem packing performance for low fugitive emissions.
• ISO 15848‑1: fugitive emissions testing standard with stringent leakage requirements.
• TA‑LUFT: German standard for air pollutant control.
• API 624 & API 641: performance standards for refinery and general valve testing.
• ISO 15848‑1 CC3: advanced leakage class certification achieved in 2025.

The company conducts extensive internal and third‑party testing on hundreds of valve models covering extreme temperature ranges (−196 °C to 400 °C) and pressure classes (Class 150 LB to Class 2500 LB).

Magpie's products support a broad range of industrial sectors, including:

• Oil & Gas: upstream, midstream, and downstream applications requiring stringent safety and emission controls.
• Chemical Processing: resistant to corrosive and high‑temperature media.
• Water & Wastewater: precision flow control and leak‑resistant components.
• Mining: durable valves for abrasive and high‑pressure environments.
• Liquefied Natural Gas (LNG): cryogenic valve solutions for low‑temperature service.
• Power Generation: including fossil, renewable, and thermal power systems.

By aligning product development with shifting environmental and regulatory landscapes, Magpie continues to deliver industry‑specific engineered valve solutions that meet evolving global demands.

Although headquartered in China, Magpie serves a global customer base through direct exports and localized partnerships. Its adherence to international standards and third‑party verified performance has strengthened its competitiveness in markets that require zero‑leakage and high‑reliability valve solutions.

The company's products are widely applied in projects with demanding operational profiles where safety, environmental compliance, and system longevity are key priorities — from petrochemical plants to large‑scale industrial installations.

Recognizing the importance of accessible technical information, Magpie offers a downloads hub providing catalogs, technical data sheets, test reports (ISO 15848‑1 and other standards), and product manuals to support engineers and purchasers in selection and specification processes.

This extensive documentation reflects the company's commitment to transparency and informed decision‑making for clients across industries.

Magpie Valve Packing Gasket Co., Ltd. has established a distinguished presence in the global industrial valve and sealing market by focusing on innovation, quality, and performance verification. Driven by deep material research and engineering excellence, the company delivers high‑integrity products that align with modern industrial standards — particularly in environments with strict leakage control and safety requirements.

With a strong R&D foundation, robust certification portfolio, and wide industry applications, Magpie positions itself not just as a manufacturer but as a technical partner capable of meeting evolving challenges in advanced valve technology.

 

ZHEJIANG VERVO VALVE CO., LTD is one of the largest industrial valve manufacturers in China, specializing in a wide range of high-quality valves, including floating ball valves, trunnion ball valves, cast and forged steel gate valves, pressure seal gate valves, globe valves, cryogenic globe valves, check valves, API 609 butterfly valves, steel plug valves, and Y-strainers. With over 15 years of experience, VERVO has earned a reputation for engineering excellence, superior quality, and reliable service in the global valve industry.

VERVO manufactures and supplies an extensive array of industrial valves to meet the diverse needs of the oil and gas, petrochemical, refinery, power generation, and other heavy industries. Their product line includes:

• Ball Valves: Floating and trunnion-mounted designs for high-pressure and industrial applications.
• Gate Valves: Cast steel, forged steel, and pressure seal types for precise flow control.
• Globe Valves: Standard and cryogenic models for high-temperature or low-temperature applications.
• Check Valves: Swing, dual plate, and forged steel options for backflow prevention.
• Butterfly Valves: API 609 certified for large-diameter applications.
• Plug Valves and Strainers: For special industrial applications requiring robust performance.

All products are designed, engineered, and manufactured according to international standards including API 6D, API 6FA, API 6A, API 600, API 602, API 603, API 609, ASME B16.34, ANSI, DIN, BS, JIS, ISO 9001, CE (PED), and GOST.

With a strong export orientation, VERVO serves markets across North America, South America, Western and Eastern Europe, Eastern and Southeast Asia, the Middle East, Africa, and Oceania. Export sales account for 90–100% of total revenue, reflecting the company's worldwide recognition and trust in its products.

Founded in 2008, VERVO has rapidly expanded its manufacturing capabilities. The company operates approximately 15,000㎡ of covered workshops, equipped with state-of-the-art machinery and equipment. This expansion enables VERVO to meet the evolving demands of the market while maintaining exceptional product quality and production efficiency.

VERVO places quality at the heart of its operations. The company owns a proprietary forging facility, producing raw materials with superior quality and competitive pricing. All valves are manufactured under ISO9001 and API Q1-certified quality management systems, ensuring consistent reliability and durability. Rigorous inspection and testing procedures guarantee that every product meets or exceeds client expectations.

VERVO has built a strong engineering team, attracting top talent in design, R&D, project support, and after-sales service. This expertise allows the company to provide custom solutions for special applications, including HF acid service, sour gas, cryogenic, chlorine, and oxygen applications. The technical team supports clients at every stage of a project, ensuring solutions are safe, efficient, and cost-effective.

VERVO emphasizes customer satisfaction, offering fast and reliable service worldwide. Their comprehensive product range, combined with engineering support and technical expertise, ensures that clients receive the right solution for every industrial challenge. VERVO continues to expand strategically, opening offices and service centers to provide localized support and faster response times for regional markets.

The company's mission is to provide the best quality valves while optimizing cost and performance for clients. By continuously improving engineering processes, production methods, and management systems, VERVO strives to deliver products that combine high quality, innovation, and economic value.

ZHEJIANG VERVO VALVE CO., LTD has established itself as a trusted global partner in the industrial valve industry. With its comprehensive product portfolio, advanced manufacturing capabilities, commitment to quality, and expert technical support, VERVO is well-positioned to meet the needs of clients worldwide. Whether for standard or specialized valve applications, VERVO remains dedicated to delivering innovative, reliable, and cost-effective solutions.

Key Highlights

• Founded: 2008 | Employees: 100–150 | Annual Sales: >$10,000,000
• Export Orientation: 90–100% | Global Market Reach
• Certifications: API, ASME, ANSI, DIN, BS, JIS, ISO, CE, GOST
• Products: Ball, Gate, Globe, Check, Butterfly, Plug Valves, Strainers