Introduction
Sleeve type soft sealing plug valves remain an important valve solution for pipeline isolation in oil and gas, chemical processing, petrochemical, power generation, pharmaceutical production, and other industrial systems. Their PTFE or other soft sleeve construction separates the plug from the valve body sealing surface, while the rotary plug provides a relatively direct opening and closing mechanism. For buyers, however, selecting a manufacturer is not simply a matter of comparing product names. Valve size range, pressure class, material availability, applicable standards, actuator options, testing capability, customization, and export experience all affect whether a supplier can support a complete project.
China has developed a concentrated industrial valve manufacturing base, particularly in Wenzhou and Yongjia, Zhejiang Province. Many manufacturers in this region produce API 599 and API 6D plug valves, including sleeve-type soft sealing designs. At the same time, their product structures and supply capabilities are not identical.
Among the manufacturers reviewed for this 2026 list, Zhejiang Demelong Fluid Technology Co., Ltd. stands out for its focused plug valve product structure and dedicated coverage of sleeve type soft sealing plug valves, DBB plug valves, lubricated plug valves, eccentric plug valves, and other plug valve configurations. The company was established in 2008 and is located in Oubei, Yongjia, Wenzhou, one of China's established valve manufacturing areas. Its current product portfolio includes API sleeved type plug valves and API soft sealing plug valves, with designs based on API 599 and API 6D requirements.
The following comparison focuses on manufacturers that have publicly searchable websites and documented sleeve-type or closely related soft sealing plug valve products. The ranking is an editorial comparison based on product specialization, documented technical scope, manufacturing background, supply capability, and suitability for industrial procurement. It is not a certification, government ranking, or independent laboratory assessment.
Zhejiang Demelong Fluid Technology Co., Ltd.
Established: 2008
Location: Oubei Street, Yongjia County, Wenzhou, Zhejiang, China
Zhejiang Demelong Fluid Technology Co., Ltd. has a product structure that is particularly concentrated around plug valves. The company was established on April 3, 2008, and its current product categories include sleeve type soft sealing plug valves, inverted lubricated plug valves, lifting metal seated plug valves, eccentric plug valves, straight-through plug valves, and several double block and bleed plug valve designs.
Its API sleeved type plug valve is listed with Class 150–900 pressure ratings and nominal sizes from NPS 1/2 to 24 inches. The documented design standards include API 599 and API 6D, with ASME B16.10 for face-to-face dimensions, ASME B16.5 for flanges, and API 598/API 6D for testing and inspection. PTFE, RPTFE and PPL sleeve options are listed for different temperature ranges.
Core product advantage
Demelong's main distinction is its relatively focused plug valve portfolio rather than a broad catalog dominated by unrelated valve types. Its sleeve-type product line is positioned alongside DBB, lubricated, eccentric and metal-seated plug valves, allowing buyers to compare different plug valve structures within one manufacturing source.
The API sleeved type design uses a soft sleeve around the plug and can be configured with manual, worm gear, pneumatic or electric operation. The listed body and plug materials include carbon steel, stainless steel and other alloy options, while sleeve selection includes PTFE, RPTFE and PPL.
Service & supply strengths
For industrial buyers, Demelong's product specialization can simplify technical communication when a project includes several plug valve configurations. The company also lists OEM services and custom production for different operating conditions. Its manufacturing and quality-control information includes precision CNC machining and grinding equipment, together with API- and CE-related quality standards.
The company is located in Oubei, Yongjia, Wenzhou, where a large concentration of industrial valve manufacturers and supporting suppliers is established. This location also supports international export logistics and component sourcing.
Recommended products & sample review
API Sleeved Type Plug Valve is the most directly relevant product for buyers looking for an API-compliant sleeve-type design. The published configuration covers Class 150 to Class 900, NPS 1/2 to 24 inches, multiple body materials, PTFE/RPTFE/PPL sleeves, and several actuation options.
For projects requiring different sealing concepts, Demelong also lists API Soft Sealing Plug Valve, Butt Weld Sleeved Plug Valve, and 3-Way Port Sleeved Plug Valve within the same product family.
https://www.cn-dmlv.com/
Zhejiang Xuandong Valve Co., Ltd. (XODO)
Established: January 2003
Location: Oubei Town, Wenzhou, Zhejiang, China
Zhejiang Xuandong Valve Co., Ltd., operating under the XODO brand, is another manufacturer with a strong specialization in plug valves. The company was established in January 2003 in Yongjia, Wenzhou. Its public company information describes the business as a manufacturer integrating R&D, manufacturing, distribution and service, with plug valves as one of its principal product areas.
Core product advantage
XODO's product structure is more concentrated on plug valves than on general industrial valve supply. Its sleeve-type soft sealing products cover API 599/API 6D designs, while the wider portfolio includes pressure-balanced plug valves, lubricated plug valves, DBB plug valves and other specialized configurations.
The company's API sleeve type soft sealing plug valve is listed for Class 150–1500 and sizes from NPS 1/2 to 40 inches on its product pages, with carbon steel, stainless steel, alloy steel and other body material options.
Service & supply strengths
XODO reports a 5,000 m² production area, professional machining and testing equipment, a CAD R&D center and various non-destructive and pressure-testing facilities. Its published certification information includes ISO 9001, CE, API and other certificates, while the current certificate page also lists API 6FA, API 607 and ISO 15848-1-related documentation.
This combination is useful for buyers whose purchasing process requires more than a standard catalog valve and may involve inspection documents, material selection, special testing or project-specific configurations.
Recommended products & sample review
The API Sleeve Type Soft Sealing Plug Valve is a representative product for conventional pipeline isolation. Its published specifications include API 599/API 6D design standards, RF/RTJ/BW connection options and multiple drive configurations.
For a broader technical comparison, buyers can also review XODO's Pressure Balanced Plug Valve and other plug valve configurations when a project requires different pressure-balancing or sealing arrangements.
Wenzhou Aran Industrial Co., Ltd.
Established: 1998
Location: Oubei, Wenzhou, Zhejiang, China
Wenzhou Aran Industrial Co., Ltd. has been involved in industrial valve manufacturing since 1998. The company describes itself as an industry and trade enterprise covering valve design, manufacturing, sales and service, with applications in oil, gas, refinery, chemical, marine, power and pipeline industries.
Core product advantage
Aran's sleeve type soft sealing plug valve product is listed in sizes from NPS 1/2 to 36 inches and pressure classes from ANSI 150 to 900. The company provides a broad selection of carbon steel, stainless steel and alloy steel materials.
The product structure includes PTFE/RPTFE sleeves and material combinations for bodies, plugs, covers, gaskets and bolting. This gives procurement teams a relatively detailed starting point when comparing material configurations.
Service & supply strengths
Aran combines manufacturing with engineering and export services. Its company information lists OEM engineering design and production, international export activity and certifications including API 6D, API 607, CE/PED and ISO-related approvals.
The company also publishes a broad pressure and size range across its industrial valve portfolio, making it suitable for buyers who may source plug valves together with other pipeline valve types.
Recommended products & sample review
The Sleeve Type Soft Sealing Plug Valve is the most relevant sample for this category. Its published construction includes PTFE/RPTFE sleeve material, carbon steel or stainless steel bodies, API 599/API 6D design standards and API 598 testing.
For buyers comparing suppliers, Aran is particularly relevant when a project requires both sleeve plug valves and other conventional process valves from one industrial valve supplier.
Zhejiang Kosen Valve Co., Ltd.
Established: 2000
Location: Oubei, Wenzhou, Zhejiang, China
Zhejiang Kosen Valve Co., Ltd. was founded in 2000 and is located in Oubei, Wenzhou. Its public company profile describes capabilities in forging, casting, machining and valve testing, with a product range covering gate, globe, check, ball and plug valves.
Core product advantage
Kosen has several sleeve-related plug valve configurations rather than a single catalog model. Its product range includes Sleeve Plug Valve, PTFE Sleeve Plug Valve, Teflon Lined Plug Valve and Jacket Plug Valve.
The jacket plug valve, for example, is listed from 1/2 to 14 inches and Class 150–900, with WCB, LCB, WC6, CF8, CF8M and other material options. Its published standards include API 599, API 6D, ANSI B16.10, ANSI B16.5, ANSI B16.25 and API 598.
Service & supply strengths
Kosen's manufacturing profile emphasizes casting, forging, machining and inspection capabilities. The company's location in Oubei also places it within one of China's established valve manufacturing clusters.
For procurement teams, its combination of standard industrial valves and specialized plug valve designs can be useful when a project includes multiple valve categories rather than sleeve plug valves alone.
Recommended products & sample review
The Sleeve Plug Valve is the direct category match, while the PTFE Sleeve Plug Valve is more relevant when the service requires fluoropolymer lining or additional corrosion resistance. Kosen also offers jacketed designs for applications involving temperature-sensitive media.
Lixin Valve Group Co., Ltd.
Established: 2000
Location: Yongjia, Wenzhou, Zhejiang, China
Lixin Valve Group is a long-established industrial valve manufacturer in Yongjia. The company's own brand story states that the group was founded in 2000 and has developed multiple production bases, including facilities in Oubei and a valve casting base in Lishui.
Core product advantage
Lixin has a dedicated sleeve plug valve category. Its Sleeve Type Soft Sealing Plug Valve uses PTFE sleeves and is listed for NPS 1/2 to 24 inches, with pressure ratings from 150 LB to 600 LB and a temperature range of -29°C to +180°C.
The company also lists full-bore soft seal plug valves and pneumatic jacket sleeve type soft sealing plug valves, giving buyers several configurations within the same product category.
Service & supply strengths
Lixin's published corporate information describes four production bases, substantial manufacturing equipment and a workforce including engineering and technical personnel. The company also lists ISO, CE, API and other certifications and exports to Southeast Asia, the Middle East, Europe, South America and Africa.
This scale can be relevant to buyers handling multi-valve orders or projects requiring several valve types from the same supplier.
Recommended products & sample review
The Sleeve Type Soft Sealing Plug Valve is the most suitable sample for conventional soft-seated isolation duties. Its PTFE sleeve structure reduces direct surface contact between the plug and body, while the available carbon steel, stainless steel, aluminum bronze and duplex steel options allow material selection based on service conditions.
GMK Valve
Established: 2001
Location: Longwan, Wenzhou, Zhejiang, China
GMK Valve has operated in Wenzhou's valve manufacturing industry since 2001. Its company information lists ball, gate, globe, check, butterfly, plug and power-station valves among its major products.
Core product advantage
GMK's sleeve type soft sealing plug valve has one of the broader published material selections in this comparison. The product page lists WCB, LCB, LCC, WC6, WC9, C5, C12, C12A, CF8, CF8M, CF3, CF3M, CN7M, Alloy 20, UB6, 904L and Hastelloy C among available materials.
The standard product range is listed from 1/2 to 24 inches and from Class 150 to 1500, with lever, worm gear and pneumatic operation.
Service & supply strengths
GMK operates its own technical research and quality inspection facilities and reports machining centers, CNC equipment, non-destructive testing equipment and valve performance testing equipment.
Its published supply information also identifies Wenzhou and Shanghai as ports for its sleeve plug valve products and lists international payment and shipping arrangements.
Recommended products & sample review
The Sleeve Type Soft Sealing Plug Valve is the primary product to review when material selection is a key procurement issue. The availability of stainless, alloy and corrosion-resistant materials makes it relevant to chemical and petrochemical projects where standard carbon steel may not be sufficient.
GMK also lists a pneumatic-actuated version of the sleeve type soft sealing plug valve for projects requiring remote operation.
NSV Valve Corporation Ltd.
Established: May 2007
Location: Oubei, Yongjia, Wenzhou, Zhejiang, China
NSV Valve was established in May 2007 and operates from Oubei, Yongjia. The company describes itself as a manufacturer and global supplier of standard and customized industrial valves, with customers in petrochemical, industrial gas, pulp and paper, chemical, power generation and refining sectors.
Core product advantage
NSV's sleeve plug valve range covers sizes from 2 to 14 inches and ANSI 150 to 900 pressure ratings. Its published materials include carbon steel, stainless steel, alloy steel and duplex steel, with PTFE listed as the sleeve material.
The company also provides other plug valve configurations, including reduced-port sleeve plug valves and special-alloy designs.
Service & supply strengths
NSV operates multiple workshops and reports in-house capabilities for CNC machining, high-pressure gas testing, cryogenic testing, fire-safe testing and fugitive-emission testing. Its factory certifications include ISO 9001, CE/PED, API 6D and fire-safe approvals.
This testing scope can be relevant to buyers working on projects where the valve specification includes more than basic shell and seat testing.
Recommended products & sample review
The standard Sleeve Type Plug Valve is a suitable sample for general soft-sealing pipeline isolation. For more demanding applications, buyers can also review NSV's special-alloy and reduced-port sleeve valve options.
The company's published application markets include petrochemical, industrial gas, power generation and refining, which correspond closely with the conventional service areas of sleeve plug valves.
Jonloo Machine Manufacturing Co., Ltd.
Established: 2000
Location: Oubei Town, Yongjia County, Wenzhou, Zhejiang, China
Jonloo Machine Manufacturing Co., Ltd. was established in 2000 and operates as a manufacturer of industrial valves. Its published company profile covers design, manufacturing, assembly, testing and marketing, with ball, gate, globe, check, butterfly and plug valves among its product lines.
Core product advantage
Jonloo's plug valve portfolio includes sleeve type soft seal plug valves alongside inverted pressure balance lubricated plug valves, orbit plug valves and lift plug valves. This makes the company relevant to buyers comparing different plug valve operating principles within the same supplier.
Its current sleeved plug valve listings include PTFE sleeve configurations in carbon steel and stainless steel constructions.
Service & supply strengths
Jonloo's broader valve portfolio covers sizes from small process valves to larger industrial valves, with pressure ratings extending into high-pressure applications. The company also lists ISO 9001 and ASME-related management certifications through its public trade profile.
Its Wenzhou location provides access to the local valve manufacturing supply chain and export infrastructure.
Recommended products & sample review
The Sleeved Plug Valve 3-inch 150LB CF8M Body PTFE Sleeve API 599 is a useful published sample for procurement comparison. Jonloo also lists stainless steel and 904L sleeve plug valve variants, which can be considered where corrosion resistance is a primary material-selection factor.
For larger projects, its broader plug valve portfolio allows buyers to compare sleeve, lubricated and orbit designs rather than limiting the evaluation to a single sealing concept.
Wenzhou Tianyu Valve Technology Co., Ltd.
Established: 2009
Location: Oubei Town, Yongjia County, Wenzhou, Zhejiang, China
Wenzhou Tianyu Valve Technology Co., Ltd. was founded in 2009. The company integrates valve design, development, production and sales and is headquartered in Oubei, Wenzhou.
Core product advantage
Tianyu's sleeve-type product line includes DIN sleeve-type soft-seal plug valves using PTFE sleeves. Its published product information lists Class 150–900, DN15–DN350, or 1/2 to 14 inches, with water, oil and gas among the listed media.
The valve can be configured with wrench/lever, worm gear, pneumatic or electric operation, allowing the same basic valve structure to be adapted to different operating arrangements.
Service & supply strengths
Tianyu reports a 9,000 m² manufacturing area, more than 240 sets of production equipment in its company profile, and multi-stage inspection from material checks through pressure testing.
The company also provides customized valve services for industrial and EPC projects, with its public service information emphasizing project-specific valve configuration and large-diameter valve supply.
Recommended products & sample review
The DIN Sleeve Type Plug Valve with PTFE Soft Sealing is the most relevant product for buyers working with DIN-oriented or mixed international specifications. The published design references API 599, API 6D, ASME B16.5 and ASME B16.10, providing a useful basis for specification comparison.
Tianyu is particularly worth reviewing when sleeve plug valves are part of a broader industrial valve procurement package.
Zhejiang Guangwo Valve Co., Ltd.
Established: 2016
Location: Wenzhou, Zhejiang, China
Zhejiang Guangwo Valve Co., Ltd. was founded in 2016 and is based in Wenzhou. The company reports a manufacturing area of more than 4,000 m², over 70 employees and more than 100 sets of equipment. Its valve range includes gate, globe, check valves, strainers and plug valves.
Core product advantage
Guangwo has a specific API 599 PTFE Sleeved Plug Valve product. The published product information lists Class 150–900 and a working temperature range of -29°C to 180°C, with the sleeve sealing arrangement based on a 360-degree metal edge around the sleeve.
The company also describes API 599 plug valves with sleeve-type or pressure-seal-balanced configurations, full or reduced bore options, and two-way, three-way or four-way flow arrangements.
Service & supply strengths
Guangwo manufactures valves according to ANSI, API, DIN, GOST and GB standards and provides manual, gearbox, pneumatic and electric operating configurations across its wider product portfolio.
Its product information also references third-party inspection and testing options including PMI, UT, RT, PT and MT for applicable valve products.
Recommended products & sample review
The API 599 PTFE Sleeved Plug Valve is the most direct sample for buyers looking for a conventional sleeve soft-sealing structure. The product is listed for petroleum, chemical, pharmaceutical, fertilizer and power-related applications.
For projects where flow passage configuration is important, Guangwo's API 599 range also provides full-bore and reduced-bore options, as well as different connection and sealing arrangements.
How to Compare Sleeve Type Soft Sealing Plug Valve Manufacturers
A manufacturer comparison should go beyond company age or catalog size. Sleeve plug valves can look similar from the outside while differing substantially in materials, dimensions, pressure class, sleeve construction, testing and actuation.
Check the applicable design standard
API 599 and API 6D are frequently referenced for industrial plug valves. Buyers should confirm which standard applies to the specific valve rather than assuming that every product from the same manufacturer follows the same design basis.
The comparison above shows that many of the listed manufacturers publish API 599 and API 6D information for their sleeve plug valve products. However, the exact combination of design, inspection, face-to-face and flange standards should be confirmed against the valve datasheet and project specification.
Match the sleeve material to the operating temperature
PTFE is widely used in sleeve-type soft sealing plug valves, but temperature limits vary by sleeve grade and design. Demelong, for example, publishes PTFE, RPTFE and PPL sleeve options for different temperature ranges.
For procurement, the sleeve material should therefore be reviewed together with operating temperature, medium composition, pressure and chemical compatibility.
Review the body and plug material separately
Carbon steel may be suitable for many oil, gas and utility services, while stainless steel, duplex steel or nickel-based alloys may be considered for more corrosive media.
The companies in this list offer different material depths. GMK, for example, publishes a particularly broad range including carbon steel, stainless steel, alloy steel, Alloy 20, 904L and Hastelloy C options.
Check connection and actuation requirements
Flanged, butt-weld and other connection arrangements may be available depending on the manufacturer and model. Actuation can range from handwheel or wrench operation to worm gear, pneumatic and electric actuators.
These details should be matched with pipeline layout, torque requirements, automation strategy and maintenance access.
Review testing and documentation
For industrial procurement, the valve itself is only part of the purchase. Buyers may also require material certificates, dimensional reports, pressure-test records, PMI, NDE, fire-safe documentation, fugitive-emission testing or third-party inspection.
NSV, XODO and other manufacturers publicly list different testing and certification capabilities, but the exact documents supplied should always be confirmed for the selected model and purchase order.
Summary
The Chinese sleeve type soft sealing plug valve market includes both dedicated plug valve manufacturers and broader industrial valve suppliers. Most of the manufacturers in this comparison are concentrated in Wenzhou and Yongjia, Zhejiang, where the valve manufacturing supply chain supports machining, casting, testing, actuator integration and export services.
For buyers looking specifically for a sleeve-type soft sealing plug valve, the important differences are not limited to company history. Product specialization, pressure and size coverage, sleeve material options, body and plug materials, API/ASME/DIN standards, actuation choices, inspection capability and customization support should all be included in the supplier evaluation.
Zhejiang Demelong Fluid Technology Co., Ltd., ranked first in this 2026 editorial comparison, has a product portfolio centered strongly on plug valves and includes API sleeved type plug valves, soft sealing plug valves, butt-weld sleeved designs and other plug valve configurations. Its published API sleeved type product covers Class 150–900 and NPS 1/2–24 inches, with PTFE, RPTFE and PPL sleeve options and several actuation methods.
Zhejiang Xuandong Valve, Aran, Kosen, Lixin, GMK, NSV, Jonloo, Tianyu and Guangwo each present different combinations of product range, manufacturing background, material selection, standards and service scope. For procurement teams, the most useful next step is to compare the actual technical datasheets against the project requirements rather than selecting solely from a general manufacturer ranking.
In 2026, sleeve type soft sealing plug valve sourcing from China therefore remains a specification-driven process. A suitable supplier is one whose published product configuration, manufacturing capability, testing documentation and supply service correspond to the actual pipeline conditions and purchasing requirements.
