Understanding Manual Butterfly Valves: Exploring Soft Sealing and Double Eccentric Variants

Dec 13, 2023 | News

Manual butterfly valves provide efficient and cost-effective flow control solutions in numerous industrial applications. Soft sealing butterfly valves, with their excellent sealing performance and low torque requirement, offer reliable shut-off capabilities without the need for automation. On the other hand, double eccentric butterfly valves provide enhanced sealing performance, reduced operating torque, and extended service life, making them suitable for applications that require higher performance and tighter shut-off.

Manual Butterfly Valves: Overview and Functionality

DC Series Soft Sealing Eccentric Butterfly Valve 2

Manual butterfly valves are quarter-turn valves that regulate the flow of fluids, gases, or slurries by rotating a disc (referred to as the “butterfly”) within a pipe. These valves operate through a manual hand lever or gear operator, allowing for easy and precise control of flow rates.

Key characteristics and functionalities of manual butterfly valves include:

a. Quarter-Turn Operation: Manual butterfly valve require only a quarter turn (90 degrees) to open or close the valve, enabling quick and efficient flow control.

b. Simple Design: These valves consist of a disc, a stem, and a body, making them relatively simple in structure and easy to install.

c. Cost-Effective Solution: Manual butterfly valves are cost-effective compared to other types of valves, making them popular choices for applications where automation is not required.

d. Flow Control Capability: These valves offer excellent flow control performance, providing the ability to regulate the flow rate precisely.

e. Low Pressure Drop: Manual butterfly valves have a low-pressure drop across the valve, minimizing energy consumption and optimizing system efficiency.

Soft Sealing Butterfly Valves: Features and Benefits

Soft sealing butterfly valve, also known as resilient seated butterfly valves, are designed with a soft elastomeric material, such as EPDM or NBR, on the valve seat and disc. This design provides a tight seal when the valve is closed, preventing leakage and ensuring reliable shut-off.

Advantages of soft sealing butterfly valves include:

a. Excellent Sealing Performance: The soft elastomeric seat and disc offer excellent sealing capabilities, minimizing the potential for leakage even in low-pressure applications.

b. Bubble-Tight Shut-Off: Soft sealing butterfly valves provide bubble-tight shut-off, ensuring reliable isolation of the flow media.

c. Low Torque Requirement: These valves require lower operating torque, allowing for easier manual operation and reducing wear on the valve components.

d. Versatile Applications: Soft sealing butterfly valves are suitable for a wide range of applications, including water treatment, HVAC systems, chemical processing, and food and beverage industries.

e. Cost-Effective Solution: Soft sealing butterfly valves offer a cost-effective option for applications that require reliable shut-off capabilities without the need for automation.

Double Eccentric Butterfly Valve: Features and Benefits

Double eccentric butterfly valves, also known as high-performance butterfly valves, feature a unique design that reduces friction and wear between the seat and disc during operation. These valves are suitable for applications that require higher performance and tighter shut-off than standard butterfly valves.

Advantages of double eccentric butterfly valves include:

a. Reduced Operating Torque: The double eccentric design minimizes the operating torque required to open and close the valve, providing smoother operation and extending the valve’s lifespan.

b. Improved Sealing Performance: The eccentric disc’s off-center rotation reduces friction with the seat during opening and closing, enhancing the valve’s sealing performance and reducing the potential for leakage.

c. High Flow Capacity: Double eccentric butterfly valves offer increased flow capacity due to their streamlined disc design, making them suitable for applications that require high flow rates.

d. Wide Temperature and Pressure Range: These valves can handle a wide range of temperatures and pressures, making them versatile for various industries and applications.

e. Extended Service Life: The reduced friction and wear between the seat and disc result in longer service life and reduced maintenance requirements.