How do you service a butterfly valve?

Make sure there is no welding residue, waste, rust or other debris in the pipe before installation. Wash with water or a mild detergent if needed. Clean the surface of the flange that will come in contact with the butterfly valve to ensure it is free of rust and debris. Wash with water or a mild detergent if needed.

Can a butterfly valve be repaired?

Since 1984, we provide complete reconditioning and repair of butterfly valves, instrumentation, accessories and parts within the U.S. and abroad. Our Class-A repair & reconditioning process ensures that all of your butterfly valves are maintained and will operate at peak efficiency.

Are butterfly valves air tight?

A butterfly valve is often the best choice as a general shut-off valve above 1.5”-148”. Their simple design allows them to take up less space and less weight than other types of valves. These valves provide a tighter seal than a gate of globe valve and are usually bubble tight.

Can you throttle a butterfly valve?

BUTTERFLY VALVES They are generally used for handling large flows of gases or liquids, including slurries, but should not be used for throttling for extended periods of time. They are also very compact relative to flanged gate and ball valves.

How do you test a butterfly valve?

To test a butterfly valve’s sealing performance, the test medium should be introduced from the medium inflow end. Make sure the butterfly plate is opened, the other end closed, and inject the test medium at the pressure specified by your testing requirements.

What is the main disadvantage of butterfly valve?

Disadvantages of butterfly valves The first disadvantage is that even when fully opened a portion of the disc is presented to the flow. Because of this, the butterfly valve always results in a pressure switch across the valve, regardless of the setting. Thicker liquids may also stop the movement of the disc.

What is a hydro test for valves?

In a hydrostatic test, the valve body is filled with testing fluid and then pressure is applied for a specified length of time. The valve is then inspected for any leakage. Learn more about valve leakage tests.