NIBCO High-Performance Butterfly Valve - Manual (Page 2)

A H E A D O F T H E F L O W ®
www.nibco.com
NIBCO INC. WORLD HEADQUARTERS • 1516 MIDDLEBURY ST. • ELKHART, IN 46516-4740 • USA • PH: 1.800.234.0227
TECH SERVICES PH: 1.888.446.4226 • FAX: 1.888.234.0557 • INTERNATIONAL OFFICE PH: +1.574.295.3327 • FAX: +1.574.295.3455
www.nibco.com
2
®
Revised 8/22/2013
Installation, Operation and Maintenance Instructions
NIBCO 6822 and 7822 Series High Performance Butterfly Valves
3.5 Fully close the valve before installation into piping to prevent damage to disc.
3.6 Determine valve orientation. The valve can be installed in any position or direction; however it is preferred to install the
valve so flow direction matches the direction arrow cast in valve body and with the stem in the horizontal (±30°) position.
This allows better protection for the seat from particles flowing in the media and from sediment build-up at stem base
giving optimal valve service life. This is very important for steam service applications due to the high travel velocities.
3.7 Always check to assure seat retainer screws are securely tightened. Refer to Section 7.19 for procedure and proper torque
specifications.
3.8 New flange gaskets are required between valve and flanges. Valves are designed to work with 1/16” thick fiber and
metallic wound gaskets. Gaskets are customer supplied.
3.9 Align gasket with valve face and pipe flanges. Install proper size cap screws (bolts) thru the flange and loosely tighten
into threaded valve mounting lugs. See Section 5 for proper cap screw sizing.
3.10 Fully open and close the valve to verify proper operation and that the disc moves freely.
3.11 First, snug all caps screws using the “Cross-over” diagonal method. Second, evenly tighten all screws using the “cross-
over” diagonal method to the proper torque for the Grade Designation of cap screw being used. Do not over tighten cap
screws.
3.12 Again fully open and close the valve to verify proper operation and free disc movement.
3.13 While NIBCO HPBFVs are rated for dead-end service, NIBCO recommends that a down-stream flange be used.
4. Stop Adjustment:
4.1 HPBFVs can be actuated by a manual lever, a manual gear operator, an electric actuator, or a pneumatic actuator. No
matter what style of actuation is used, it is critical that the actuator CLOSED travel limit stop is properly set to
match valve disc/seat orientation for proper seal. The OPEN stop adjustment is not critical; ±5° travel is adequate.
4.2 The CLOSED actuator stop should be set before the valve is installed into piping so you can visually see that the disc is
centered in the seat (disc front face is parallel with seat retainer face). Note that the valve has an “over-travel” stop at
the disc edge. This “over-travel” stop is only to keep the disc from rotating too far thru the seat. When the disc is properly
centered in the seat, the disc edge usually does not contact the “over-travel” stop.
4.3 There are several different manufactures of gear operators, electric and pneumatic actuators. While the adjustment
procedure is not exactly the same for all manufacturers, they are all very similar to procedures described below.
Manual Lever Adjustment
4.4
Move the lever handle into the closed position and allow trigger to securely latch in the last notch of the throttle plate.
Visually inspect the disc to assure it is centered in the seat. If not, slightly loosen the (2) cap screws that hold the throttle
plate to the top flange of valve. With the trigger securely latched in last notch, rotate manual lever (and throttle plate)
until disc is centered in seat. There is enough clearance in throttle plate mounting holes to allow for adjustment. Securely
tighten throttle plate cap screws. Cycle valve from CLOSED position to OPEN position, then back to CLOSED. Verify disc
is centered in seat when CLOSED. Adjustment of OPEN stop in not necessary, as it will automatically be set.