Manual Butterfly Valve - Ningjin Thriveon Valve Co., Ltd. | Features, Applications

Manual butterfly valves are critical components in fluid control systems, offering a reliable and cost-effective solution for a wide range of industrial applications. This article delves into the **features, technical specifications, and practical applications** of manual butterfly valves, while also highlighting the expertise of **Ningjin Thriveon Valve Co., Ltd.**, a leading manufacturer in this domain. Whether you're an engineer, a procurement specialist, or a student of fluid dynamics, this guide provides a comprehensive overview of manual butterfly valves and their role in modern engineering.

Understanding Manual Butterfly Valves

Butterfly valves are a type of quarter-turn valve that regulates flow by rotating a disc within the valve body. When it comes to **manual butterfly valves**, these devices are operated manually, typically through a lever or gear mechanism. Unlike **electric** or **pneumatic actuators**, manual valves rely on direct human input, making them ideal for applications where simplicity, cost-effectiveness, and ease of maintenance are priorities.

The **manual operated butterfly valve** is a subset of this category, encompassing both **lever-operated** and **gear-operated** designs. These valves are characterized by their **simple structure**, **compact size**, and **lightweight** construction, which contribute to their widespread use in industries such as water treatment, HVAC, and chemical processing.

One of the key advantages of **manual butterfly valves** is their **ease of installation**. As outlined in the **manual butterfly valve FAQ**, these valves are designed for straightforward integration into piping systems. The installation process typically involves aligning the flanges, securing the bolts, and ensuring the disc is in the correct position to avoid misalignment issues.

Key Features and Technical Specifications

The **manual butterfly valve** is engineered to meet stringent industry standards, ensuring durability and performance under varying conditions. Below is a detailed breakdown of its **material composition, pressure ratings, and application range**:

Material Composition

The construction of manual butterfly valves involves a combination of **high-quality materials** to ensure longevity and resistance to corrosion. Common materials include:

• Body: Grey Cast Iron, Ductile Cast Iron, Stainless Steel 304/316, Carbon Steel
• Disc: Ductile Cast Iron (Nickel-plated or Nylon coated), Stainless Steel 304/316, Aluminum Bronze
• Stem: Stainless Steel 410/416/304/316
• Seat: EPDM, BUNA-N, PTFE, Viton, Hypalon, Neoprene, Metal Seated

These materials are chosen based on the specific requirements of the application, such as **temperature, pressure, and chemical compatibility**.

Pressure Ratings

Manual butterfly valves are designed to operate under a range of pressure conditions, making them suitable for diverse environments. The pressure ratings include:

• CLASS 125/150
• PN10/16/25
• 5K/10K/16K

These ratings ensure that the valves can handle both low- and high-pressure systems, depending on the design and material selection.

Application Standards

Manual butterfly valves comply with international standards such as:

• API 609
• BS5155
• MSS SP-67/68
• EN593

These standards guarantee that the valves meet the required specifications for performance, safety, and reliability.

Product Specifications Table

Feature	Details
Material	Grey Cast Iron, Ductile Cast Iron, Stainless Steel 304/316, Carbon Steel
Disc Material	Ductile Cast Iron (Nickel-plated or Nylon coated), Stainless Steel 304/316, Aluminum Bronze
Stem Material	Stainless Steel 410/416/304/316
Seat Material	EPDM, BUNA-N, PTFE, Viton, Hypalon, Neoprene, Metal Seated
Pressure Rating	CLASS 125/150, PN10/16/25, 5K/10K/16K
Standards Compliance	API 609, BS5155, MSS SP-67/68, EN593

Applications and Industry Use Cases

Manual butterfly valves are employed in a variety of industries due to their **versatility and efficiency**. Some common applications include:

• Water Treatment: Controlling the flow of water in municipal and industrial water supply systems.
• HVAC Systems: Regulating airflow and water circulation in heating, ventilation, and air conditioning systems.
• Chemical Processing: Managing the flow of corrosive and non-corrosive liquids in chemical plants.
• Oil and Gas: Controlling the flow of gases and liquids in pipelines and storage tanks.

The **manual wafer butterfly valve DN150** is a popular choice for **low-pressure applications** where space constraints are a concern. Its **compact design** and **easy installation** make it ideal for use in **modular systems** and **small-scale operations**.

Advantages of Manual Butterfly Valves

Compared to **electric** or **pneumatic actuators**, manual butterfly valves offer several **distinct advantages**:

• Cost-Effectiveness: Manual valves are generally less expensive to purchase and maintain.
• Simple Operation: The **lever or gear mechanism** allows for straightforward control without the need for external power sources.
• Reliability: With fewer moving parts, manual valves are less prone to mechanical failures.
• Low Maintenance: The **simple structure** reduces the need for frequent servicing.

These benefits make manual butterfly valves a **preferred choice** in environments where **simplicity and durability** are paramount.

Company Background: Ningjin Thriveon Valve Co., Ltd.

**Ningjin Thriveon Valve Co., Ltd.** is a reputable manufacturer of **manual butterfly valves** and other industrial valves. With a focus on **quality, innovation, and customer satisfaction**, the company has established itself as a leader in the valve industry. Their product lineup includes **manual butterfly valves with limit switches**, **hand-operated butterfly valves**, and **manual exhaust butterfly valves**, catering to a wide range of applications.

As a **manual butterfly valve manufacturer**, Ningjin Thriveon Valve Co., Ltd. adheres to **international standards** and employs advanced manufacturing techniques to ensure **precision and reliability** in every product. Their commitment to **customer-centric solutions** has earned them a strong reputation in the global market.

For more information about their products and services, visit the **official product page** or explore their **company website**.

Installation and Maintenance Tips

Proper installation and regular maintenance are essential for the **optimal performance** of manual butterfly valves. Here are some key guidelines:

1. Flange Alignment: Ensure the flanges are spaced correctly to allow the valve to pass easily. The disc should be in a half-opened position during installation.
2. Sealing:** Avoid using gaskets between the flanges to prevent misalignment and leakage.
3. Bolt Tightening: Insert all bolts with the disc in the half-opened position, but do not tighten the nuts immediately. Open the valve fully to check for alignment, then tighten the nuts.
4. Regular Inspections: Periodically check the valve for signs of wear, corrosion, or leakage. Lubricate moving parts as needed.

By following these steps, users can ensure the **longevity and efficiency** of their manual butterfly valves.

Industry Standards and Certifications

Manual butterfly valves are designed to meet **rigorous industry standards** to ensure safety, performance, and compliance. Key standards include:

• API 609: Specifies requirements for butterfly valves used in the petroleum and natural gas industries.
• EN593: Defines the design and testing requirements for butterfly valves in general industrial applications.
• MSS SP-67/68: Provides guidelines for the material, design, and testing of butterfly valves.

These standards are developed by organizations such as the **American Petroleum Institute (API)** and the **European Committee for Standardization (CEN)**, ensuring that valves meet the highest levels of quality and reliability. For more information on these standards, refer to the **National Institute of Standards and Technology (NIST)** website.

Conclusion

Manual butterfly valves are an essential component in modern fluid control systems, offering a **cost-effective, reliable, and easy-to-maintain solution** for a wide range of applications. Their **simple design** and **versatility** make them a preferred choice in industries such as **water treatment, HVAC, and chemical processing**. With the expertise of **Ningjin Thriveon Valve Co., Ltd.** and adherence to international standards, these valves continue to play a critical role in **industrial innovation and efficiency**.

For further details, visit the **manual butterfly valve product page** or explore the **company website**.

References

1. National Institute of Standards and Technology (NIST) – Standards and measurements for industrial valves.

2. Manual Butterfly Valve Product Page – Detailed specifications and applications.

3. Ningjin Thriveon Valve Co., Ltd. – Manufacturer of high-quality manual butterfly valves.