Make sure the pipeline and flange faces are clean. Any foreign material such as metal filings, pipe scale, welding slag, welding rods, etc. can limit disc movement or damage the disc or seat.
Gaskets are not required on resilient seated valves because they extend to both faces of the valve.
Align the pipe-work, and spread the flanges enough to allow the valve body to be easily inserted between the flanges without contacting the pipe flanges.
Check that the valve disc has been set to about 10% open so it doesn't become jammed in the fully seated position.
Insert the valve between the flanges as shown, taking care not to damage the seat faces. Always lift the valve by the locating holes or by using a nylon sling on the neck or the body. Never lift the valve by the actuator or operator mounted on the valve.
Place the valve between the flanges, centre it, insert the bolts and hand-tighten them. Carefully open the disc, making sure the disc does not contact the inside of the adjacent pipes.
Very slowly close the valve disc to ensure disc edge clearance from the adjacent pipe flange.
Fully open the disc and tighten all flange bolts as shown.
Repeat a full close to full open rotation of the disc to ensure proper clearances.
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