Installation
1      Piping systems should be thoroughly cleaned and free from ingress of foreign materials.
2      Visually inspect the valve seating and ports for cleanliness immediately prior to installation.
3      All valves should be independently supported against movement and stress from the connected piping system.
4      Check that the valve pressure rating is compatible with service conditions
5      Operate the valve at least once from the open to closed position.
6      Ensure that mating Flanges are compatible with intended service conditions.
7      Install valves with the disc in the almost closed position. Good working practice dictates that butterfly valves installed in
        the horizontal position have the stems in the vertical position.
8      Interference between the butterfly valve disc and the mating pipes should be avoided under all circumstances. Before
        tightening flange bolts, carefully open the valve to the open position and check for any disc interference.
9      Ensure that the valve is centrally located between the flanges, is independently supported and is not dependent for any
        support from the connecting pipework.
        Wafer valves should be installed by installing bolts through the lugs and tightening carefully, ensuring even contact
        between the flange face and Elastomer. Forcing the wafer valves into a tight space will cause damage to the Elastomer and
        should be avoided.
10    Tighten the bolts using the crossover method to distribute the loads evenly over the valves. Do not overtighten the bolts.
11    On dead end service a mating downstream blank flange should be installed to ensure safety.
12    Verify and adjust gear operator stops after installation.

Operation is via a lever handle with an indicator disc or a gear operator with an indicator.

Operation
Periodic inspection and operation of the valves is recommended to prevent buildup of foreign materials inside the valves and
piping system.