manual butterfly valve manufacturer|Features, Applications

Introduction to Manual Butterfly Valves

Butterfly valves are essential components in fluid control systems, offering a reliable and efficient means of regulating flow. Among the various types of butterfly valves, the manual butterfly valve stands out for its simplicity, cost-effectiveness, and ease of operation. Unlike pneumatic or electric actuated valves, manual butterfly valves are operated by hand, making them ideal for applications where automation is unnecessary or impractical. This article delves into the features, advantages, technical specifications, and applications of manual butterfly valves, with a focus on their design, material composition, and industry relevance.

Key Features of Manual Butterfly Valves

Manual butterfly valves are characterized by their simple structure, lightweight design, and ease of installation. These valves are typically operated using a lever or gear mechanism, allowing users to manually open or close the valve. The lever-operated and gear-operated variants are the most common types of manual butterfly valves, each offering distinct advantages depending on the application requirements.

One of the primary benefits of manual butterfly valves is their low maintenance and cost-effective operation. The absence of complex actuation systems reduces the likelihood of mechanical failures and minimizes repair costs. Additionally, their compact size makes them suitable for installations with limited space, such as in industrial pipelines or HVAC systems.

Manual butterfly valves are also known for their versatility in handling a wide range of fluids, including water, gases, and various chemicals. The choice of materials used in their construction ensures durability and resistance to corrosion, making them suitable for both general and specialized applications.

Materials and Construction

The materials used in the construction of manual butterfly valves are critical to their performance and longevity. The following are the key components and materials typically employed:

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

The selection of materials depends on the specific operating conditions, such as temperature, pressure, and the type of fluid being controlled. For instance, stainless steel and nickel-plated ductile iron are often used in corrosive environments, while metal-seated valves are preferred for high-temperature applications.

Pressure Ratings and Standards

Manual butterfly valves are designed to meet a wide range of pressure requirements, ensuring compatibility with various industrial systems. The pressure ratings typically include:

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

These pressure ratings are aligned with international standards such as API 609, BS5155, MSS SP-67/68, and EN593, which govern the design, testing, and installation of butterfly valves. Compliance with these standards ensures that the valves meet rigorous quality and safety requirements, making them suitable for critical applications in industries like oil and gas, water treatment, and chemical processing.

Installation and Maintenance

Proper installation is crucial to the optimal performance of manual butterfly valves. The following steps are recommended:

1. Space out the flanges to ensure the valve can pass through easily. The disc should be in a half-opened position during installation.
2. Do not fit gaskets between the flanges to avoid misalignment.
3. With the disc in a half-opened position, insert all the bolts without tightening the nuts initially.
4. Open the valve fully to verify that the pipeline is correctly aligned. Once confirmed, tighten the nuts securely.

Regular maintenance, such as lubrication of the stem and inspection of the seat for wear, is essential to prolong the valve's lifespan. The manual operation of these valves allows for easy access to internal components, simplifying maintenance tasks.

Advantages of Manual Butterfly Valves

Manual butterfly valves offer several advantages over their automated counterparts:

• Cost-Effective: The absence of actuators and control systems reduces both initial costs and long-term maintenance expenses.
• Simple Operation: Users can manually adjust the valve without the need for external power sources or complex controls.
• Compact Design: Their lightweight and space-saving structure makes them ideal for installations with limited space.
• Reliability: With fewer moving parts, manual valves are less prone to mechanical failures.

These advantages make manual butterfly valves a preferred choice for applications where simplicity and reliability are paramount.

Applications of Manual Butterfly Valves

Manual butterfly valves are widely used across various industries due to their versatility and durability. Key applications include:

• Water Treatment: Controlling flow in municipal water supply systems and wastewater treatment plants.
• HVAC Systems: Regulating air and water flow in heating, ventilation, and air conditioning systems.
• Chemical Processing: Managing the flow of corrosive and non-corrosive chemicals in industrial pipelines.
• Oil and Gas: Controlling fluid flow in low-pressure environments, such as in storage tanks and distribution systems.

For more information on specific applications, visit the manual butterfly valve product page.

Company Background: Ningjin Thriveon Valve Co., Ltd.

Ningjin Thriveon Valve Co., Ltd., based in Hebei, China, is a leading manufacturer of manual butterfly valves and other industrial valve solutions. With a focus on quality, innovation, and customer satisfaction, the company has established itself as a trusted supplier in the global market. Their expertise in valve design and manufacturing ensures that their products meet the highest standards of performance and reliability.

For more details about the company, visit the Ningjin Thriveon Valve Co., Ltd. website.

Product Specifications Table

FAQs About Manual Butterfly Valves

Q1. What is a Manual Butterfly Valve?

A manual butterfly valve is a type of valve that is operated by hand, typically using a lever or gear mechanism. It is commonly used in applications where automation is not required. For more details, visit the manual butterfly valve product page.

Q2. What are the Advantages of Manual Butterfly Valves?

Manual butterfly valves offer a simple structure, lightweight design, and cost-effective operation. They are easy to install and maintain, making them ideal for a wide range of industrial applications.

Conclusion

Manual butterfly valves are a reliable and cost-effective solution for fluid control in various industries. Their simple design, versatile applications, and compliance with international standards make them a preferred choice for engineers and technicians. Whether used in water treatment, HVAC systems, or chemical processing, manual butterfly valves provide efficient and durable performance. For more information on manual butterfly valve manufacturers or specific product details, visit the manual butterfly valve product page or the Ningjin Thriveon Valve Co., Ltd. website.

References

1. National Institute of Standards and Technology (NIST). (n.d.). Standards and Measurements. Retrieved from https://www.nist.gov/

2. NIST. (2025). Driving Innovation. Retrieved from https://www.nist.gov/

3. NIST. (2025). What we do. Retrieved from https://www.nist.gov/