Used Butterfly Valves

How Do Butterfly Valves Work?

Butterfly valves are simple yet effective devices that regulate the flow of fluids in various systems. They operate with the help of a rotating disc or butterfly, which acts as a closure element. These valves can either allow or restrict the fluid passes. When the disc is turned parallel to the direction of fluid flow, it permits unrestricted flow, and when turned perpendicular, it obstructs the flow. The control is achieved by adjusting the disc angle. This can be done manually or using automated systems. Today, butterfly valves are employed across industries owing to their compact design, quick operation, minimal pressure drop, and more.

Types of Butterfly Valves

Different types of butterfly valves are available to cater to different operational requirements. Here are some important ones.

• Concentric Butterfly Valves: This is the most common type of butterfly valve. They feature a circular disc centered in the pipe bore. These valves are ideal for applications with low-pressure drops.
• Double Offset Butterfly Valves: As the name suggests, they have two levels of offset - one from the center and another from the sealing axis. It provides a tight seal and is used for applications with higher temperatures and pressures.
• Triple Offset Butterfly Valves: These valves offer tight sealing with three offset levels. They are ideal for applications involving corrosive or high-temperature fluids.
• Eccentric Butterfly Valves: They are designed in such a way that the disc is offset from the center of the pipe. This reduces friction and wear during operation. They are preferred in high pressure applications with demanding conditions.
• Wafer Type Butterfly Valves: They are thin and light in weight, with no lugs or flanges. Wafer type butterfly valves are sandwiched between pipe flanges and held-in-place with bolts.
• High-Performance Butterfly Valves: Engineered for demanding conditions, these valves are suitable for applications requiring tight shutoff, high-pressure, and high-temperature capabilities.

Why Consider Used Butterfly Valves Over New Ones?

There are several benefits of used butterfly valves over new ones. Here are some important reasons why you consider using butterfly valves.

1. Cost Savings:This is one of the most compelling reasons to consider using butterfly valves. Compared to new butterfly valves, used valves are more cost effective, and particularly beneficial when working with budget constraints.
2. Availability:There are chances that manufacturers might discontinue specific models of butterfly valves. If your application demands these valves, opting for used valves might be the only way to fulfill your needs.
3. Compatibility:Used valves might be more compatible if you have an older system, reducing the need for extensive modifications.
4. Short-Term Projects:Investing in used butterfly valves can be a cost-effective solution if you are working on a short-term project or a temporary application. These valves can serve your needs without requiring a significant upfront investment.
5. Emergency Replacements:If you experience a valve failure and need a quick replacement, used valves can be a great solution when you require speedy delivery. 
6. Refurbished Options:Some used butterfly valves are refurbished or reconditioned before being sold. These valves can offer performance and reliability equivalent to new valves.
7. Environmental Considerations:Opting for used valves can be more environmentally friendly since it eliminates the energy and resources required for manufacturing new valves.

Applications of Butterfly Valves

Butterfly valves find uses across industries owing to their beneficial features such as cost-effectiveness, compact design, ease of operation, and more. Typical applications of butterfly valves include:

• Aerospace
• HVAC System
• Power Generation
• Mining and Slurry
• Oil and Gas Industry
• Agricultural Irrigation
• Fire Protection Systems
• Pharmaceutical Industry
• Paper and Pulp Industry
• Food and Beverage Industry
• Automotive Manufacturing
• Chemical and Petrochemical Industries
• Water and Wastewater Management

Butterfly Valves Assembly and Installation

The assembly and installation process of butterfly valves requires careful attention to detail to ensure efficient functioning and operation. Here are some important tips on how to assemble and install butterfly valves: 

1. Pre-installation: Clean all the required equipment and close the system using water before installation and operation. Make sure you have the necessary tools and equipment for installation. This includes nuts, gaskets, wrenches, and the valves. Refer to the manufacturer’s documentation and instructions for specific valve models. 
2. Valve Inspection: It is important to inspect the valve for any visible damage, defects, or foreign particles. Ensure all components are clean and free from debris.
3. Flange Preparation: Prepare the flanges on both sides of the system where the valve will be installed. Check and ensure they are clean, flat, and free of any obstructions.
4. Gasket Placement: A gasket should be placed between the flange faces. The gasket should match the material and pressure specifications of the system.
5. Valve Installation: Position the valve between the flanges, aligning the bolt holes on the valve flange with those on the pipeline flanges. Insert bolts through the aligned holes, ensuring they pass through the valve, gasket, and pipeline flange.
6. Tightening Bolts: Begin tightening the bolts evenly to ensure even pressure distribution. Avoid over-tightening, which can distort the valve body or damage the gasket.
7. Verification: Double check the alignment of the gasket and the valve to avoid gaps or misalignments. Confirm all bolts are tightened to the specified torque values.
8. Testing: Conduct a leak test to check if the valve is appropriately sealed. Apply a test medium under controlled pressure and inspect for any leaks. Operate the valve through its full range of motion to verify smooth operation.
9. System Integration: Integrate the valve into the system, connecting the pipeline to the system components as needed.
10. Documentation: Always keep records of the installation process, including leak test results, torque values, and any adjustments made during installation. 
11. Maintenance and Monitoring: Regular inspection of the valve and its components is essential to analyze the wear, corrosion, or damage signs. Also, monitor the valves performance to detect any operational issues.

What Are the Common Butterfly Valves Problems and How to Fix Them?

Like any other mechanical equipment, butterfly valves can experience various problems that may affect their performance over time. Here are some common issues and suggestions on how to fix them.

• Leakage: Leakage can occur owing to issues with the valve seat, gasket, or seal, leading to fluid loss, reduced efficiency, and safety concerns. Inspect and replace damaged gaskets or seals. If leakage persists, check for misalignment, corrosion, or damage to the valve seat and address these issues. 
• Corrosion and Erosion: This is the most common problem butterfly valves experience, as their material may degrade over time and affect the structural integrity and sealing capabilities. Regular inspection may benefit in many ways and help prevent corrosion and wear. Also, material selectin is an important aspect in this regard. It is essential to choose materials resistant to the corrosive nature of the fluid. 
• Poor Sealing: Poor sealing can lead to inefficiency and leakage. Inspect the sealing components such as gasket and seal, for wear or damage. Adjust the valves alignment if necessary.
• Sticking: The valve’s disc can stick or bind, preventing smooth operation and proper flow control. This can be fixed by lubricating the valve components regularly as per the manufacturer’s recommendations. 
• Noise or Vibration: Valve misalignment or improper installation can lead to unwanted noise or vibration issues. Securely aligning the valve with the pipeline may help in addressing this issue.  
• Temperature and Pressure Limitations: Operating the valve beyond its temperature or pressure limits can lead to distortion, leakage, or reduced service life. Therefore, the valve must be used within its specified temperature and pressure range. 

At JM Industrial, our top priority is the satisfaction of our customers. This is why we have become a reliable platform for buying used butterfly valves. Whether you want to buy or sell used butterfly valves, knife gate valves, rotary valves, liquid process valves and more we are a one-stop solution. You can discuss your requirement with our team of experts. They can assist you in selecting the right butterfly valves that would fit your requirement. Contact us to know more about the equipment we offer.