Honeywell VH2 Données Techniques page 19

VH2, VH3, VH4, VH5, VH6, VH7, VH8 ANSI 150 CLASS HIGH PERFORMANCE BUTTERFLY VALVES
Installation Practices
• VH series butterfly valves are designed to be installed
between ANSI 125/150 flat-faced or raised face, slip-on
weld neck flanges.
• Valve should be installed a minimum of 6 pipe
diameters from upstream or downstream elbows,
strainers, pumps, etc.
• For chilled water, condenser water or hot water
applications, the valve should be installed with the stem
in a vertical orientation, with the actuator mounted
above the valve.
• For applications in which there is a possibility of
sediment in the flow, the valve should be installed with
the stem in a horizontal position and the bottom of the
disc should close FROM the downstream side, rather
than from the upstream side.
• Flange gaskets must be used on VH series BF valves.
• Make sure the flange faces are clean and free of rust,
scale and debris to prevent damage to the flange gasket.
• Follow the recommended flange bolting sequence
found in Fig. 12.
Installation using Welded Flanges
• Mount flanges on both sides of valve body and install
bolts to properly align valve body and both flanges.
• Make sure the valve I.D. and flange internal diameters
are in alignment.
• Take valve body / flange pair assembly and align with
piping ends.
• TACK weld the flanges to the piping in several places. Do
NOT seam weld at this time!
• Remove the lug bolts and carefully remove the valve
body from the flanges.
• Seam weld the entire flange / piping connection for
both flanges.
• Let the piping components cool completely before re-
inserting the valve body.
WARNING
Seam welding with the valve body installed
between the flanges can damage the valve seats
due to heat migration through the flange to the
valve body.
Pre-Installation Procedure
1. Remove the protective face covers from the valve.
2. Inspect the valve to be certain the waterway is free
from dirt and foreign matter. Be certain the adjoining
pipeline is free from any foreign material such as rust
and pipe scale or welding slag that could damage the
seat and disc sealing surfaces.
3. Actuators should be mounted on the valve prior to
installation to facilitate proper alignment of the disc
in the valve seat.
4. The valve should be in the closed position. Make sure
the open and closed positions of the actuator corre-
spond to the counter-clockwise to open direction of
rotation of the valve.
5. Cycle the valve to the fully open position, then back to
the fully closed position, checking the actuator travel
stop settings for proper disc alignment.
6. Check the valve identification tag for valve class,
materials, and operating pressure to be sure they are
correct for the application.
WARNING
Personal injury or property damage may result if
the valve is installed where service conditions
could exceed the valve ratings.
7. Check the flange bolts or studs for proper size,
threading, and length.
REMEMBER: Install the valve with the disc in the full-
closed position using the appropriate flange gaskets on
BOTH valve flange faces.
Valve Installation Procedure
1. The VH Series High Performance Butterfly Valve can
be installed in the pipeline with the shaft in the verti-
cal, horizontal, or other intermediate position above
the pipe centerline (Fig. 11.) Based on applications
experience, however, in media with concentrations of
solid or abrasive particles or media subject to solidifi-
cation buildup, valve performance and service life will
be enhanced by mounting the valve with the shaft in
the horizontal position.
NOTE: Actuator must be mounted at or above pipe cen-
terline for all actuator types.
2. All VH series valves are directional and must be
mounted in the pipeline with the seat retainer ring
located upstream (sus) to provide maximum seat
protection.
For VH Series valves:
a. Noting the flow direction arrow on the tag, place
the valve between the flanges, making sure the
arrow on the tag points in the direction of the flow.
b. Install the lower flange bolts loosely, leaving
space for the flange gaskets.
c. After inserting the flange gaskets, install the
remaining bolts.
3. Using the sequence shown in Fig. 12, tighten the
flange bolts evenly to assure uniform gasket com-
pression.
CAUTION
The VH series valve should be centered between
the flanges and gaskets to prevent damage to the
disc edge and shaft as a result of the disc striking
the flange, gasket, or pipe.
4. Electricity should be connected to the unit as speci-
fied by the actuator manufacturer.
5. The valve is now ready for operation.
19 31-00191EF—02