NIBCO High-Performance Butterfly Valve User Manual

NIBCO Accessories for water

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Revised 8/22/2013


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Installation, Operation and Maintenance Guide II

NIBCO High Performance Butterfly Valves

Series 6822 and 7822


NIBCO High Performance Butterfly Valves, Series 6822 and 7822, have been designed and manufactured for fluid control handling in

suitable mechanical systems. It is important to follow the instructions below to assure proper valve installation and safe trouble-free

operation. Failure to follow these instructions may result in reduced valve performance and may cause loss of manufacturer’s


1. Application:

1.1 The selection of the valve design and materials of construction as related to the specific service application is the sole

responsibility of the end user.

1.2 All NIBCO HPBFVs have an Identification Plate attached to the perimeter of the valve top flange. Important information

including valve size, class, materials of construction, and pressure/temperature ratings are shown.

1.3 Review corrosive effects of the media to be used in the valve and assure it is compatible with the valve materials of


1.4 Do not install the valve where the pressure/temperature ratings can be exceeded. As temperature increases, the safe

working pressure decreases. The pressure/temperature ratings are based on API Standard 609 and can be found in the

appropriate NIBCO Butterfly Valve catalog.

1.5 Valves should be regularly maintained; reference Section 7. Valves used in services where erosion or other detrimental

situations can occur should be inspected on a regular basis.

2. Storage:

2.1 Valves are shipped in the closed position with flange covers to protect the sealing surfaces and internal valve parts. These

covers should remain on the valve until actual installation into piping.

2.2 The valves must be stored in a dry environment, protected from temperature extremes and possibility of damage. The

valve body is made from carbon steel and rust can appear on inside surfaces, this will not affect valve performance.

Special care should be taken to prevent damage to the disc edge and sealing surfaces.

3. Installation:

3.1 Inspect the piping and remove all dirt, welding slag, rust, and scale from the piping and flange faces. It is advisable to

install a strainer upstream of the valve to prevent contamination from entering the valve. It is very important for long

trouble-free service to keep the valve free of all contamination that may damage the seal surfaces.

3.2 Remove the protective covers from valve faces and carefully check the valve for any damage that may have occurred

during shipping and handling.

3.3 Fully open the valve and verify that sufficient diametrical clearance is available for the valve disc to extend into both

mating pipe flanges and piping.

3.4 Cycle the valve from full open to full closed positions checking to assure the operator stops are set properly. Stops must

be properly set before the valve is installed into the piping. See Section 4 for proper stop adjustment procedure.