Butterfly valves are typically selected for applications that have space constraints, as their body designs are among the narrowest in the industry. , The designed butterfly valves can be used for Slurry, mine and slag cement. but erosive slurry will be accelerated around both sides of the butterfly disc, significantly reducing the valve’s service life.

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Butterfly Valve Maintenance instructions

Mounting
1.Remove any protective flange covers from the valve
2. Inspect the valve to be certain the waterway is free from dirt and foreign matter.
3. Be certain the adjoining pipeline is free from any foreign material such as rust and pipe scale or welding slag that could damage theseat and disc sealing surfaces.
4. Any actuator should be mounted on the walve prior to installationto facilitate proper alignment of the disc in the valve seat.
5. Check the valve identification tag for materials, and operating pressure to be sure they are correct for the application.
6. Check the flange bolts or studs for proper size, threading and length,
7. Thoroughly clean all parts.Inspect components for any defects.
8. Apply a small amount of silicone grease to the inside surfaces of thebody, including the upper and lower shaft holes.
9. Insert the shaft bushings into the body being careful not to allowintrusion into the body seat bore.
10. Install the seat into the center of the body, making, sure the shaftholes in the seat line up with the holes in the body.

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Dismounting?

1. Position the valve flat with the disc in the closed position.

2. Loosen the taper pin from the valve disc using, a hammer and punch.

Note: Punch should be of same size or larger diameter as small end of taper pin to avoid mushrooming, of taper pin.

3. Remowe taper pin from disc. Extract the valve shaft from the bodyusing a twisting motion.Remove the valve disc from body making sure not to damage theseat or disc sealing, edge.

4. Cartridge seat removal can be accomplished from either direction by applying pressure evenly on one face to push the seat throughthe body.

5. lf the valve is of dead end service design, remove sets crews around periphery of body extending into seat prior to seat removal.

6.Remowe shaft bushings from body as required