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Our Advantage

Why Global Customers Choose SLVCN?
Why SLV Is Trusted By So Many Globel Importer?
Direct Factory
We have our own R&D dept with self-developed mould and our own production line.
Full-range Product
Our product suitable for various fields and we can provide diversified choices according to different working conditions.
Guaranteed Quality
High quality standards, one purchase with lifetime service, quality assurance is unequivocal.
Service Team
Professional service team with timely reply and detailed answer.

Double Block and Bleed Ball Valve
Class 300 Trunnion-mounted Forged Steel Ball Valve
Class 900 Reduced Port Ultra-Low-Temperature Ball Valve
Class 1500 High Pressure Ball Valve
Class 2500 High Pressure Ball Valve

Shoulong Valve Applications In Multiple Industries

We specialize in manufacturing a wide variety of valves, including ball valves, butterfly valves, globe valves, gate valves, check valves, and solenoid valves.
Company News
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SLVCN completed the shipment of DN40 and DN50 pneumatic PTFE-lined wafer butterfly valves with double acting pneumatic actuators, limit switches, and DC24V solenoid valves for a customer in Southeast Asia.

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Discover the main classifications of ball valves — by actuation, structure, connection, and application — with selection tips to choose the right valve for your pipeline.

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industry news
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2025/09/23

Choosing the right butterfly valve body material is critical for performance and service life. This article explains the strengths and limitations of the most common materials — including cast iron (FC), ductile iron (FCD, GGG40, GGG50, DI), carbon steel (WCB, A105), stainless steel (CF8/CF8M), duplex stainless steel (2520, 2507), aluminum bronze, and plastics (PVC, CPVC, PVDF). We cover where each material fits best: from water and HVAC pipelines to chemical, marine, and high-temperature applications. A quick selection guide with corrosion resistance ratings helps buyers make faster, smarter decisions.

2025/09/23

Choosing the right butterfly valve body material is critical for performance and service life. This article explains the strengths and limitations of the most common materials — including cast iron (FC), ductile iron (FCD, GGG40, GGG50, DI), carbon steel (WCB, A105), stainless steel (CF8/CF8M), duplex stainless steel (2520, 2507), aluminum bronze, and plastics (PVC, CPVC, PVDF). We cover where each material fits best: from water and HVAC pipelines to chemical, marine, and high-temperature applications. A quick selection guide with corrosion resistance ratings helps buyers make faster, smarter decisions.

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2026/03/27

Learn how lug butterfly valves enable easy maintenance and reliable pipeline isolation. Discover key features, applications, and size options for industrial systems.

2026/03/27

Learn how lug butterfly valves enable easy maintenance and reliable pipeline isolation. Discover key features, applications, and size options for industrial systems.

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2026/03/12

Discover the reliability and durability of flanged butterfly valves, designed for high-pressure pipeline systems in industries like oil & gas, power generation, and chemical processing. With superior sealing, corrosion resistance, and enhanced performance, these valves are ideal for demanding applications. Learn about their key advantages, applications, and how SLVCN offers customized solutions tailored to your specific needs.

2026/03/12

Discover the reliability and durability of flanged butterfly valves, designed for high-pressure pipeline systems in industries like oil & gas, power generation, and chemical processing. With superior sealing, corrosion resistance, and enhanced performance, these valves are ideal for demanding applications. Learn about their key advantages, applications, and how SLVCN offers customized solutions tailored to your specific needs.

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2026/03/06

This article introduces wafer butterfly valves, including their design features, advantages, common industrial applications, and how they compare with other butterfly valve types.

2026/03/06

This article introduces wafer butterfly valves, including their design features, advantages, common industrial applications, and how they compare with other butterfly valve types.

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2026/02/03

Clamp ball valves are essential for both hygienic and industrial piping systems, offering quick installation, easy maintenance, and reliable performance. Semi-encapsulated valves are ideal for industrial use, while full-encapsulated valves excel in hygienic applications. SLVCN supplies high-quality valves to over 100 countries, ensuring global reliability and performance.

2026/02/03

Clamp ball valves are essential for both hygienic and industrial piping systems, offering quick installation, easy maintenance, and reliable performance. Semi-encapsulated valves are ideal for industrial use, while full-encapsulated valves excel in hygienic applications. SLVCN supplies high-quality valves to over 100 countries, ensuring global reliability and performance.

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2026/01/28

This guide helps engineers and buyers select the right clamp ball valve for sanitary and industrial pipelines. It covers structural types, materials, seat & gasket options, actuation methods, and vacuum applications for reliable, hygienic, and long-term performance.

2026/01/28

This guide helps engineers and buyers select the right clamp ball valve for sanitary and industrial pipelines. It covers structural types, materials, seat & gasket options, actuation methods, and vacuum applications for reliable, hygienic, and long-term performance.

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2026/01/22

A clamp ball valve, also known as a sanitary ball valve, features a clamp connection for quick installation and easy maintenance. Compared with threaded, flanged, and welded ball valves, it offers superior flexibility and hygiene. With full-encapsulated and semi-encapsulated designs available, clamp ball valves are widely used in sanitary stainless steel valve systems for food, pharmaceutical, and industrial applications.

2026/01/22

A clamp ball valve, also known as a sanitary ball valve, features a clamp connection for quick installation and easy maintenance. Compared with threaded, flanged, and welded ball valves, it offers superior flexibility and hygiene. With full-encapsulated and semi-encapsulated designs available, clamp ball valves are widely used in sanitary stainless steel valve systems for food, pharmaceutical, and industrial applications.

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2025/12/31

Welded ball valves are crucial for many industrial applications, but like all valves, they require regular maintenance. Learn the common problems with welded ball valves, such as leaks, actuator issues, and flow inconsistencies, along with easy solutions to keep your valve running smoothly. Find out how to solve common welded ball valve issues including leaks, actuator malfunctions, and pressure loss. Our expert solutions help you ensure reliable performance and extend valve lifespan.

2025/12/31

Welded ball valves are crucial for many industrial applications, but like all valves, they require regular maintenance. Learn the common problems with welded ball valves, such as leaks, actuator issues, and flow inconsistencies, along with easy solutions to keep your valve running smoothly. Find out how to solve common welded ball valve issues including leaks, actuator malfunctions, and pressure loss. Our expert solutions help you ensure reliable performance and extend valve lifespan.

Cooperative Partners

Over the years, we have established cooperative relationships with more than 1500 customers from over 100 countries.
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Contact Us
  Tel: +86-180-6165-9285
  Phone: +86-25-5885-5535
  E-mail: info@slv-cn.com
  Address: No.22, Liuzhou North Road, Pukou District, Nanjing, Jiangsu, China

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