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

Manual butterfly valves are essential components in fluid control systems, offering a reliable and cost-effective solution for various industrial applications. This article delves into the manual butterfly valve's features, advantages, technical specifications, and its role in modern engineering. Whether you're a manufacturer, engineer, or industry professional, this guide will provide you with in-depth insights into the functionality and benefits of manual butterfly valves.

What is a Manual Butterfly Valve?

A manual butterfly valve is a type of quarter-turn valve that uses a disc to regulate flow. Unlike pneumatic or electric actuators, manual butterfly valves are operated by hand, making them ideal for applications where simplicity and cost-efficiency are prioritized. They are commonly used in systems requiring frequent adjustments, such as water supply, HVAC, and chemical processing.

According to the National Institute of Standards and Technology (NIST), manual valves play a critical role in ensuring the accuracy and reliability of fluid control systems. Their design adheres to industry standards like API 609 and EN 593, ensuring compatibility and performance across diverse environments.

Key Features and Advantages

Manual butterfly valves are renowned for their manual operated butterfly valve simplicity and durability. Here are some of their standout features:

• Simple Structure: The manual design eliminates the need for complex actuation systems, reducing maintenance requirements.
• Lightweight and Compact: These valves are designed for easy installation and space-saving applications.
• Cost-Effective: Their straightforward mechanism makes them an economical choice for many industries.
• Quick Operation: With a quarter-turn motion, manual valves allow for rapid flow control.

Compared to gear-operated butterfly valves, manual valves are more accessible for on-the-spot adjustments, though they may not suit high-pressure or high-temperature environments.

Technical Specifications

The manual butterfly valve is engineered to meet rigorous industry standards. Below is a detailed breakdown of its technical specifications:

Material	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
Pressure Rating	CLASS 125/150; PN10/16/25; 5K/10K/16K
Standards Compliance	API 609, BS 5155, MSS SP-67/68, EN 593
Installation Requirements	Space flanges to allow the valve to pass easily. The disc should be in a half-opened position. Avoid using gaskets between flanges. Install bolts with the disc in a half-opened position, but do not tighten the nuts yet. Open the valve fully to verify pipeline alignment, then tighten the nuts.

Applications of Manual Butterfly Valves

Manual butterfly valves are versatile and find applications in a wide range of industries. Their ability to handle various media, including water, gases, and chemicals, makes them suitable for:

• Water Treatment: Controlling flow in municipal water supply and wastewater systems.
• HVAC Systems: Regulating air and fluid flow in heating and cooling systems.
• Chemical Processing: Managing the flow of corrosive or non-corrosive liquids.
• Power Generation: Supporting boiler feedwater and cooling systems.

As noted by NIST, the design of manual butterfly valves aligns with international standards, ensuring their reliability in critical applications. For example, the manual wafer butterfly valve DN150 is often used in industrial pipelines where space constraints are a concern.

Installation and Maintenance

Proper installation is crucial for the optimal performance of manual butterfly valves. Follow these steps to ensure a seamless setup:

1. Position the valve between flanges, ensuring the disc is in a half-opened state.
2. Insert bolts without tightening them immediately.
3. Open the valve fully to check for pipeline alignment.
4. Tighten the nuts securely after verification.

Regular maintenance, such as lubricating the stem and inspecting the seat for wear, ensures longevity. For complex systems, consulting the manual butterfly valve manufacturer's guidelines is recommended.

Frequently Asked Questions

1. What is a Manual Butterfly Valve?

A manual butterfly valve is a type of valve operated by hand, typically using a lever or gear mechanism. It is commonly used in applications where manual control is sufficient, such as in low-pressure or low-temperature environments.

2. What are the Advantages of Manual Butterfly Valves?

Manual butterfly valves offer manual operated butterfly valve simplicity, cost-effectiveness, and ease of installation. Their compact design reduces the need for extensive piping, making them ideal for space-constrained systems.

3. How Do I Choose the Right Manual Butterfly Valve?

Consider factors such as material compatibility, pressure ratings, and industry standards. For example, stainless steel valves are suitable for corrosive environments, while carbon steel valves are ideal for high-pressure applications.

About the Manufacturer: Ningjin Thriveon Valve Co., Ltd.

As a leading manual butterfly valve manufacturer, Ningjin Thriveon Valve Co., Ltd. has established itself as a trusted name in the industry. With a focus on innovation and quality, the company provides a wide range of butterfly valves tailored to meet diverse operational needs. Their commitment to adhering to international standards ensures that their products are reliable and efficient.

Conclusion

Manual butterfly valves are indispensable in modern engineering, offering a balance of simplicity, durability, and cost-efficiency. Whether you're managing a water treatment plant or a chemical processing facility, understanding the specifications and applications of these valves is essential. For more information, visit the manual butterfly valve page or contact Ningjin Thriveon Valve Co., Ltd. directly.

References

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