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The Valve Disc Material of Concentric Type Butterfly Valve

The common valve disc materials for middle-line butterfly valves are as follows, with each material suitable for different working environments and media:

Ductile Iron: Known for its good strength, toughness, and impact resistance, ductile iron is commonly used in general industrial applications involving media such as water and gas. It is cost-effective, but its corrosion resistance is relatively poor.

304 Stainless Steel: A widely used stainless steel material, 304 offers good corrosion resistance and is suitable for less aggressive corrosive media, such as water, air, and oil.

316 Stainless Steel: Compared to 304, 316 stainless steel offers better corrosion resistance, especially in environments with more aggressive media like seawater, acidic substances, or saltwater.

C95400 Aluminum Bronze: This material provides excellent corrosion resistance, wear resistance, and mechanical strength, and is widely used in marine, shipbuilding, and chemical industries. It is suitable for highly corrosive media such as seawater and saltwater.

C95800 Aluminum Bronze: With higher strength and enhanced corrosion resistance, C95800 is particularly suitable for marine environments and applications involving corrosive media like acids and chlorides.

These materials are selected based on specific application requirements such as temperature, pressure, and the corrosiveness of the media, ensuring the most suitable valve disc material for optimal performance.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:   https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Electroplating of Single Plate Check Valves

Electroplating is a surface treatment process for single-plate check valves that aims to enhance their corrosion resistance, wear resistance, and aesthetic appeal. This process is particularly suited for valves operating in corrosive environments for extended periods. Below is an overview of the electroplating process and key considerations for single-plate check valves:

Common Electroplating Types

Zinc Plating

  1. Features: Economical and practical; suitable for low-corrosion environments.
  2. Applications: Commonly used in indoor or mildly corrosive conditions.

Nickel Plating

  1. Features: Excellent corrosion resistance and decorative finish with a smooth surface.
  2. Applications: Ideal for medium-corrosion environments with higher demands.

Chrome Plating

  • Features: High wear resistance, hardness, and surface gloss.
  • Applications: Used in industrial environments with high wear and corrosion.

Zinc-Aluminum Alloy Plating

  • Features: Combines the advantages of zinc and aluminum for superior corrosion resistance.
  • Applications: Suitable for harsh environments, such as marine climates or chemical plants.

Multilayer Composite Plating

  • Features: Combines multiple metal layers to enhance overall performance.
  • Applications: High-demand scenarios, such as aerospace and marine industries.

Electroplating Process

Pre-treatment

  1. Degreasing: Cleans oil and grease from the surface using an alkaline solution.
  2. Rust Removal: Removes surface rust via acid pickling or mechanical methods.
  3. Surface Activation: Improves plating adhesion.

Electroplating Stage

  1. Primary Electroplating: The valve is placed in an electrolyte solution, where a chemical reaction deposits the metal layer.
  2. Post-Plating Treatment: Includes passivation to enhance corrosion resistance.

Inspection and Post-Treatment

  1. Plating Thickness Check: Ensures the layer meets design specifications.
  2. Appearance Check: Inspects for defects such as bubbles or cracks.
  3. Sealing Treatment: Seals the plating layer to improve corrosion resistance.

Key Considerations

Material Selection
The substrate material of the single-plate check valve must be identified before electroplating. Common materials include cast iron, stainless steel, and carbon steel, which may require different plating processes.

Plating Thickness
Determine the plating thickness based on the operating environment, typically ranging from 5 to 25 microns.

Environmental Compliance
Some electroplating processes involve hazardous substances (e.g., hexavalent chromium). Compliance with environmental regulations is essential, and eco-friendly plating options should be prioritized.

Adhesion Testing
Ensure strong adhesion between the plating and substrate to prevent peeling or flaking.

Corrosion Resistance Testing
Validate the plating’s corrosion resistance through salt spray tests and other methods.

Conclusion

Electroplating significantly improves the service life and performance of single-plate check valves. Selecting the appropriate plating process and ensuring stringent quality control are critical. For customized electroplating solutions, consult a professional surface treatment provider or manufacturer.

Corrosion Prevention Methods for WCB Material Valve Bodies in Marine Valves

WCB material (carbon steel castings) is prone to corrosion in certain environments, especially in marine applications. To enhance the service life of WCB valves, effective corrosion prevention methods are necessary. Here are some common approaches:

1. Cathodic Protection

  • Principle:Install sacrificial anodes (e.g., zinc or magnesium blocks) on the valve body to protect it from corrosion through electrochemical reactions.
  • Application:Commonly used in seawater pipelines on ships to prevent salt-induced corrosion.

2. Surface Coating Protection

  • Anti-corrosion Coatings:Apply protective coatings, such as epoxy resin or polyurethane, to the valve surface to create a barrier against corrosive media.
  • Metallic Coatings:Use thermal spraying to apply a corrosion-resistant metal layer (e.g., aluminum or zinc alloys) on the surface.
  • Key Requirement:The coating should be uniform, durable, and provide strong adhesion, especially in areas like threads and internal surfaces.

3. Internal Lining with Corrosion-resistant Materials

  • Method:Line the internal surfaces of the valve with corrosion-resistant materials, such as rubber, fluoroplastics (PTFE), or lead.
  • Advantages:Directly protects the valve from contact with corrosive media, significantly extending its service life.
  • Application:Ideal for systems handling highly acidic or alkaline fluids.

4. Application of Anti-rust Oil or Lubricants

  • Regular Maintenance:Apply anti-rust oil or lubricants to the valve surface, especially for valves that are not in regular use.
  • Application:Effective in humid or salt-laden environments typical in marine settings.

5. Material Modification or Upgrades

If the environment involves severe corrosion (e.g., sulfur gases, acidic water), WCB material can be treated or upgraded:

  • Chromium or Nickel Surface Treatment:Enhances oxidation and corrosion resistance.
  • Use of Alloy Materials:Opt for higher-grade materials like CF8 or CF8M (stainless steel valve bodies) for better performance.

6. Electroplating

  • Methods:Apply zinc, nickel, or chromium plating to the WCB valve body using electroplating techniques.
  • Advantages:Provides a dense, wear-resistant, and corrosion-resistant surface with a polished appearance.

7. Environmental Control

  • Reduce Exposure:Minimize direct contact with high-salinity air or water.
  • Cleaning and Maintenance:Regularly clean salt, dirt, or corrosive deposits from the valve surface to keep it in optimal condition.

8. Combination of Methods

  • Coating + Cathodic Protection:Combining surface coatings with cathodic protection can effectively address different types of corrosion and provide comprehensive protection.

Selection Criteria for Corrosion Prevention

  • Environmental Conditions:Whether the valve is exposed to seawater or acidic/alkaline environments.
  • Media Type:The corrosiveness of the fluids being handled.
  • Valve Type and Parts:Different requirements for internal passages and external valve body protection.
  • Cost-effectiveness:Balancing the cost of corrosion prevention with the expected service life.

In the marine industry, a combination of coatings and cathodic protection is widely used to ensure the durability of WCB material valves. If you have specific application scenarios, the prevention strategy can be further optimized.

Corrosion Resistance of Marine Butterfly Valves

The corrosion resistance of marine butterfly valves is a critical factor in their selection and application, especially in marine environments. Due to the presence of salt spray, high humidity, and seawater’s corrosive nature, marine equipment requires superior corrosion-resistant properties. Below are key aspects related to the corrosion resistance of marine butterfly valves:

1. Material Selection

Material plays a crucial role in determining the corrosion resistance of marine butterfly valves. Common materials include:

  • Stainless Steel(e.g., 316, 316L): Offers excellent resistance to corrosion and is suitable for saltwater and corrosive chemical media.
  • Bronze: Resists saltwater corrosion and is commonly used in seawater piping systems.
  • Duplex Stainless Steel: Combines high strength with resistance to pitting and crevice corrosion, making it ideal for harsh marine environments.
  • Plastic Linings(e.g., PTFE, PVDF): Plastic-lined valves enhance corrosion resistance, making them suitable for handling highly corrosive media.

2. Coating and Protection

Marine butterfly valves often feature coatings or surface treatments to improve corrosion resistance:

  • Epoxy Coatings: Enhance resistance to corrosion, particularly in seawater contact areas.
  • Thermal Spray Coatings: Application of corrosion-resistant alloys (e.g., nickel-based alloys) provides additional protection.
  • Anodizing(for aluminum alloys): Improves surface hardness and resistance to oxidation.

3. Design Features

  • Seal Material Selection: Resistant materials such as EPDM or fluororubber are often used for seals to prevent failures due to corrosion.
  • Optimized Structure: Minimizing gaps and dead zones reduces the accumulation of corrosive substances.

4. Environmental Impact

  • In marine environments, salt spray and electrochemical corrosion require special attention to pitting and crevice corrosion resistance.
  • For valves submerged in seawater for extended periods, electrochemical corrosion prevention methods such as cathodic protection are essential.

5. Standards and Certifications

The materials and corrosion resistance of marine butterfly valves must comply with international or industry standards, such as:

  • ISO 15156(Standards for materials resistant to sulfide stress corrosion).
  • DNV GL, ABS, BV Certifications: International classification societies impose stringent requirements for corrosion protection in marine equipment.

6. Maintenance and Care

Regular inspection and cleaning of the valve surface, along with timely replenishment or replacement of coatings, can effectively extend the service life of marine butterfly valves.

In summary, the corrosion resistance of marine butterfly valves depends primarily on material selection, surface treatment technologies, and appropriate adaptation to specific environmental conditions. During design and selection, it is crucial to consider factors such as media properties, operating temperature, and pressure comprehensively.

Shaft Materials in Marine Valve

Shafts in marine valves are critical components that connect the actuator or handwheel to the valve’s internal components, allowing for control of fluid flow. The material selection for marine valve shafts depends on the application, operating environment, and fluid type. Common shaft materials in marine valve applications include:

1. Stainless Steels

  • Grade 316/316L:
    • High corrosion resistance, particularly against seawater and marine atmospheres.
    • Suitable for most marine applications, including those handling water, oils, and certain chemicals.
  • Duplex Stainless Steels (e.g., 2205):
    • High strength and superior corrosion resistance.
    • Excellent performance in environments with high chloride concentrations (e.g., seawater).
  • Super Duplex Stainless Steel (e.g., 2507):
    • For highly aggressive environments, including high-pressure seawater systems.

2. Bronze and Brass Alloys

  • Aluminum Bronze (e.g., C95400, C95800):
    • Excellent resistance to marine corrosion and biofouling.
    • Commonly used in seawater applications.
  • Nickel-Aluminum Bronze:
    • Provides higher strength and wear resistance.
    • Often used in valves for seawater and hydraulic systems.

3. Monel (Alloy 400)

  • High resistance to corrosion, particularly in saltwater and acidic conditions.
  • Ideal for highly corrosive environments, including marine chemical systems.

4. Hastelloy (e.g., C276, C22)

  • Exceptional resistance to chemical corrosion.
  • Used in marine environments with aggressive chemicals or extreme conditions.

5. Titanium

  • Excellent resistance to seawater corrosion and lightweight.
  • Used in specialized, high-performance applications (e.g., submarines, desalination systems).

6. Carbon Steel (with coatings)

  • Less expensive but requires protective coatings (e.g., epoxy, galvanizing) to prevent corrosion in marine environments.
  • Typically used in less demanding applications.

7. Nickel Alloys

  • Provides excellent resistance to oxidation and chloride-induced corrosion.
  • Often used in valves for extreme marine environments.

Material Selection Factors:

  • Corrosion Resistance: Seawater and chlorides are particularly aggressive.
  • Strength and Durability: High-pressure systems require stronger materials.
  • Temperature Resistance: Some applications involve elevated temperatures.
  • Chemical Compatibility: Fluids handled by the valve may demand specific material compatibility.
  • Cost: Balancing performance with budget constraints.

When designing or selecting shafts for marine valves, proper consideration of operating conditions and regulatory standards (e.g., ABS, DNV, or IMO) is crucial to ensure reliability and compliance.

Rubber Seats in Marine Butterfly Valves

Rubber seats are widely used in marine butterfly valves, particularly in the design of centerline butterfly valves. These rubber seats offer excellent sealing performance, prevent medium leakage, and resist corrosion and wear in the marine environment. Below are some key characteristics and applications of rubber seats in marine butterfly valves:

marine valve seat

marine valve seat

1. Excellent Sealing Performance

Due to their flexible material, rubber seats can tightly fit the valve disc, ensuring good sealing. Even under low-pressure conditions, they effectively prevent leakage, which is crucial for the safety of ship systems.

2. Corrosion Resistance

As ships operate in marine environments, their piping systems are often exposed to seawater. Rubber seats, typically made from materials such as neoprene (CR), EPDM, and nitrile rubber (NBR), offer excellent corrosion resistance and can withstand exposure to seawater, oils, and other mediums, thereby extending the valve’s service life.

3. Wear Resistance and Aging Resistance

Rubber seats in marine butterfly valves are typically resistant to wear and aging. This allows the valve to maintain good sealing performance over long periods without aging or failure, making them especially suitable for systems with frequent opening and closing operations.

4. Easy Replacement and Maintenance

The design of rubber seats makes them easy to replace, particularly in the maintenance of marine piping systems. Due to the elasticity of the rubber material, installation and removal are relatively simple, reducing maintenance time and cost.

5. Adaptability to Different Temperatures and Pressures

Rubber seats used in marine systems are typically capable of handling a wide range of temperatures and pressures, making them suitable for various ship applications, including cooling water systems, ballast water systems, and firefighting systems.

Common Materials and Applications

  • Neoprene (CR): Suitable for seawater, oils, and other mediums, widely used in seawater cooling and ballast water systems.
  • EPDM: Offers excellent acid, alkali, and heat resistance, making it ideal for freshwater and air systems.
  • Nitrile Rubber (NBR): Has strong oil resistance, suitable for fuel systems.
  • fluororubber (Viton or FKM):typically withstanding temperatures above 200°C, making it suitable for high-temperature piping systems.

Rubber seats are an essential component in marine butterfly valves. Their sealing performance, corrosion resistance, wear resistance, and ease of maintenance make them indispensable in the marine industry.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:   https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

The Booming Development of China’s Shipbuilding Industry

China’s shipbuilding industry has experienced remarkable growth in recent years, establishing itself as a global leader. Several key factors are driving this rapid expansion:

Policy Support: The Chinese government has provided strong policy support to the shipbuilding industry, viewing it as a vital strategic sector, particularly under initiatives like the “Belt and Road” and “Maritime Power” strategies. A range of supportive policies, such as financial subsidies, favorable financing, and R&D support, encourage the development of large ships, high-value vessels, and eco-friendly ships.

Technological Innovation and R&D: Chinese shipbuilders have steadily increased their investment in technological innovation, establishing an advanced shipbuilding technology system. In recent years, they have made significant strides in high-end ships such as LNG carriers and very large crude carriers (VLCCs). In addition, progress in intelligent vessels and autonomous ships has propelled technological upgrades across the industry.

Production Capacity and Economies of Scale: China’s shipbuilding industry has extensive production capacity and economies of scale, allowing for mass production of various types of vessels to meet global demands. The country’s top three shipbuilding groups—China State Shipbuilding Corporation (CSSC), China Shipbuilding Industry Corporation (CSIC), and China Merchants Heavy Industry—play a pivotal role in the global market, with strong production capacity and large-scale operations.

Market Demand and Globalization: With the growth of global trade, especially in the Asia-Pacific and African regions, demand for large transport vessels continues to rise. Additionally, the global shift towards green shipping has driven the research and production of low-emission, energy-efficient ships. China’s shipbuilding industry actively engages in international collaboration and mergers, continuously expanding its market share.

Complete Industry Chain: China has a comprehensive shipbuilding supply chain, covering steel, electrical equipment, communication, and automation industries, ensuring efficient integration of materials and equipment. Moreover, related logistics, ports, and service facilities are continuously improving, creating a complete ecosystem for shipbuilding.

China’s share in the global market is steadily rising, with shipbuilding orders in 2023 surpassing those of South Korea and Japan, reflecting the industry’s competitive strength. It also highlights Chinese enterprises’ breakthroughs in high-end and green shipping sectors. As China advances in smart manufacturing and green energy, its shipbuilding industry is expected to continue expanding its influence on the global stage.

Disc Materials of Butterfly Check Valve（dual plate check valve)

The disc of a butterfly check valve plays a crucial role in controlling the flow of fluids by pivoting on a central axis to either open or close the valve. Depending on the application, pressure, and the fluid being handled, different materials are used for manufacturing the disc. Below are common materials used for butterfly check valve discs:

1. Stainless Steel

  • Grades: 304, 316, 316L
  • Characteristics: High resistance to corrosion, good mechanical properties, and durability. Suitable for water, steam, chemical, and food-grade applications.
  • Common Uses: Petrochemical, food and beverage, and water treatment industries.

2. Carbon Steel

  • Characteristics: Strong and cost-effective, but less corrosion-resistant than stainless steel. Usually requires coatings for corrosion protection.
  • Common Uses: General-purpose industrial applications where corrosion resistance is not a primary concern.

3. Ductile Iron

  • Characteristics: Combines strength and flexibility, offering good toughness and ductility. Requires coating (e.g., epoxy) for corrosion resistance.
  • Common Uses: Water distribution, wastewater, and low-pressure applications.

4. Aluminum Bronze

  • Characteristics: High corrosion resistance, particularly in seawater and marine environments. Good strength and wear resistance.
  • Common Uses: Marine, seawater handling, and desalination plants.

5. Nylon-Coated Disc

  • Characteristics: Nylon coating provides enhanced wear resistance and some degree of corrosion protection. Suitable for mildly corrosive environments.
  • Common Uses: Low-pressure industrial applications.

6. Elastomer-Lined Disc (Rubber)

  • Materials: EPDM, NBR (Nitrile), FKM (Viton)
  • Characteristics: The disc is typically coated with elastomeric materials to provide a bubble-tight seal and resist specific chemicals. Different elastomers offer various resistances to temperature, chemicals, and abrasives.
  • Common Uses: Applications requiring chemical resistance or sanitary conditions, like food processing and chemical plants.

7. Hastelloy

  • Characteristics: Highly resistant to corrosive and harsh chemical environments, particularly acids and oxidizing agents.
  • Common Uses: Chemical processing, pharmaceuticals, and industries dealing with corrosive fluids.

8. Monel

  • Characteristics: Extremely resistant to corrosion, particularly from acids, alkalis, and seawater. Excellent mechanical strength.
  • Common Uses: Marine, oil & gas, chemical, and heat exchanger applications.

9. Titanium

  • Characteristics: Exceptional resistance to corrosion in seawater, chlorides, and acidic environments. Lightweight and highly durable.
  • Common Uses: Aerospace, marine, chemical, and desalination applications.

The selection of disc material in a butterfly check valve is based on factors like the type of fluid being handled, the operating temperature and pressure, and the desired longevity of the valve.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:   https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Body Materials of Butterfly Check Valve

Butterfly check valves, used to prevent backflow in piping systems, are made from various materials depending on the application, fluid type, and operating conditions. The most common body materials for butterfly check valves include:

  1. Cast Iron:

Usage: Often used in general water applications, HVAC, and non-corrosive fluid systems.

Properties: Economical, good strength, and durability, but prone to corrosion if not coated.

2. Ductile Iron:

  • Usage:Preferred in water and sewage systems, oil and gas applications.
  • Properties:Stronger and more flexible than cast iron, offers better corrosion resistance and can handle higher pressures.

3. Carbon Steel:

  • Usage:Suitable for high-pressure and high-temperature applications such as oil, gas, and steam systems.
  • Properties:Strong and durable, but requires corrosion protection (e.g., coatings or linings) when used with corrosive media.

4. Stainless Steel (304, 316):

  • Usage:Common in corrosive environments, such as chemical processing, food, and pharmaceutical industries.
  • Properties:Excellent corrosion resistance, especially in environments involving chemicals or saltwater. More expensive but ideal for long-term durability in harsh conditions.

5. Aluminum Bronze:

  • Usage:Often used in marine applications or systems involving seawater.
  • Properties:High corrosion resistance, particularly in seawater and other saline environments.

6. PVC (Polyvinyl Chloride) / Plastic:

  • Usage:Frequently used in low-pressure systems, particularly in chemical or water treatment applications.
  • Properties:Lightweight, corrosion-resistant, and economical, but limited by temperature and pressure constraints.

7. Titanium:

  • Usage:Used in highly corrosive environments, such as in the chemical industry.
  • Properties:Excellent corrosion resistance and high strength-to-weight ratio, but expensive.

Each material is selected based on the specific application requirements, such as pressure, temperature, fluid type, and environmental conditions.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:   https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Feature of Concentric Type Butterfly Valve with Carbon Steel Body

A concentric butterfly valve with a carbon steel body is a common type of valve used in industrial applications for regulating or isolating the flow of fluids. The concentric design means that the valve disc and stem are aligned on the same axis, making it suitable for low-to-moderate pressure applications. Below are the key features of this type of valve:

  1. Concentric Design (Centerlined)

Shaft and Disc Alignment: The shaft (or stem) is centrally located in the valve body, and the disc rotates on the same axis as the shaft. This allows for even pressure distribution on the valve seat.

No Offsets: Unlike offset butterfly valves, concentric valves have no displacement of the shaft relative to the seat and disc, making them simpler and easier to maintain.

  1. Carbon Steel Body

Material Strength: Carbon steel is strong and durable, suitable for applications that involve moderate pressure and temperature.

Corrosion Resistance: Carbon steel provides moderate corrosion resistance but may require external coatings (such as epoxy) or internal linings to protect against aggressive chemicals or moisture.

Temperature Tolerance: Carbon steel can withstand relatively high temperatures (up to approximately 425°C or 800°F), making it appropriate for steam, oil, or gas applications.

Cost-Effective: Carbon steel is less expensive compared to stainless steel, making it a cost-effective solution for many industrial applications.

  1. Soft Seat

Elastomeric Seat: Concentric butterfly valves typically use soft seats made from elastomeric materials like EPDM, Nitrile (Buna-N), or PTFE. These materials provide a bubble-tight seal, especially in low-pressure applications.

Replaceable Seat: The seat is often replaceable, which allows for easy maintenance and longer valve life.

Leakage Protection: Soft seats offer good sealing performance and can achieve zero leakage (Class VI shutoff).

  1. Disc Design

Material: The disc is typically made of stainless steel, ductile iron, or other alloys to provide enhanced corrosion resistance in different environments.

Low Flow Resistance: When the valve is fully open, the disc is parallel to the flow of the fluid, resulting in minimal flow resistance and a low-pressure drop.

Tight Shutoff: The disc is designed to provide tight shutoff, making the valve ideal for applications where leakage prevention is critical.

  1. Bi-Directional Flow

The concentric butterfly valve is capable of controlling the flow of fluids in both directions, enhancing its versatility in piping systems.

  1. Low Torque Requirement

The concentric design requires low torque for operation. This makes the valve easier to operate manually and reduces the power needed for actuation when automated.

  1. Compact and Lightweight

Space-Saving: Butterfly valves are compact and lightweight compared to other valve types like gate or globe valves. This makes installation easier and reduces the weight on piping systems, especially in larger diameter applications.

  1. Wafer or Lug Type Connection

Wafer Type: Designed to fit between two flanges using long bolts that pass through both flanges and the valve body.

Lug Type: Features threaded inserts, allowing the valve to be installed between flanges and secured with bolts on each side. This enables removal of downstream piping without disturbing the upstream piping.

  1. Operation Options

Manual Operation: Operated using a handwheel or lever for simple, on/off control.

Automated Operation: The valve can be equipped with pneumatic, electric, or hydraulic actuators for remote or automated control.

  1. Applications

Suitable for low-to-moderate pressure and temperature applications in industries like:Water Treatment: Used in pipelines for water distribution and wastewater treatment.

HVAC Systems: Applied in heating, ventilation, and air conditioning systems for flow regulation.

Oil & Gas: Used in gas transmission pipelines, oil refineries, and other industrial applications involving non-corrosive fluids.

Chemical Processing: Ideal for handling non-corrosive chemicals, light acids, and alkaline solutions.

Power Generation: Common in cooling water and steam lines.

  1. Easy Maintenance

The simple design of the concentric butterfly valve with fewer moving parts allows for easy maintenance. The seat and disc are generally replaceable, reducing downtime and operational costs.

  1. Pressure and Temperature Range

Pressure Rating: Typically suitable for low to medium pressure applications (up to 300 PSI or higher depending on the design).

Temperature Range: Can handle a wide range of temperatures, especially when paired with appropriate seat materials. However, soft-seated valves are more suitable for moderate temperature ranges.

  1. Cost-Effective Solution

Concentric butterfly valves with carbon steel bodies offer an economical solution for applications where high durability, moderate pressure handling, and cost-efficiency are required, making them popular for general-purpose use in industries like water treatment, HVAC, and oil and gas.

Summary of Key Benefits:

Cost-Effective: Carbon steel is affordable, and concentric valves are simpler in design.

Durable: Withstands moderate temperature and pressure applications.

Compact: Saves space and reduces the overall weight of the piping system.

Easy to Maintain: Simple design with replaceable parts.

Versatile: Suitable for water, gas, steam, and light chemical handling.

 

These features make concentric butterfly valves with carbon steel bodies ideal for a variety of applications that require reliability, cost-efficiency, and easy maintenance.

 

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:   https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

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