Butterfly Valve Maintenance Checklist Catalog Library Installation, operation, & maintenance bv bv d butterfly valves maintenance other notes api bv bv d butterfly valves require only minimal regular maintenance. the following represents a preventive checklist: 1. check (and adjust if necessary) that the valve is operating properly in the full closed and full open position. 2. To reassemble, place the disc inside the seat in the open position. align the stem hole thru the body and disc. insert the stem into the body and disc, making sure to align the geometric drive flats between the stem and disc. replace both stem and body o ring seals on the collar bushing and insert over the stem.
Manual Butterfly Valve 4matic Catalogue All delta t series resilient seated butterfly valves have an identification tag attached to the valve body. please see figure 1, showing an example of the typical information provided for reference: gasket considerations the cartridge seat design of the delta t 050 051 and 650 651 series butterfly valves are such. Butterfly valves are quarter turn flow control devices that utilize a metallic disc that rotates around a fixed stem axis. they are quick action flow control valves that allow rotations through 90 degrees to move from fully opened to a closed position. when the disc is perpendicular to the centerline of the pipe, the valve is at a closed position. the valve will be fully open (permit maximum. The main components of a butterfly valve include the stem, body, sealing arrangement, upper bearing, lower bearing, bonnet, actuator, seat, and disc. the design of each component varies based on the materials used, flow media, and purpose. the body of a butterfly valve fits between two pipe flanges, with the most common designs being lug and wafer. Close the valve so far, that the disc edge is at least 10mm within the body. insert the valve between the flanges, center the valve body and insert all flange bolts. tighten the flange bolts tight by hand. slowly open the valve completely. (the disc is in line with keyway in stem head.).
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