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This instruction manual includes installation, operation and maintenance information for 2" through 30" stainless
steel and stainless steel lined knife gate valves. This manual addresses hand-wheel operated knife gate valves
only. Please refer to other FNW manuals for other knife gate valves, actuated valves, modifications, or
accessories.
WARNING
To avoid personal injury to yourself, fellow workers, or damage to property from release of process fluid, before
installation:
a. Shut off all operating lines to the valve site
b. Isolate the valve site completely from the process
c. Release process pressure
d. Drain the process fluid from the valve site
1. If the valve was supplied with an actuator, secondary support may be necessary. Contact FNW for
recommendations.
2. Before installing the valve, inspect the valve body port and associated equipment for any damage that may
have occurred and for any foreign matter that may have collected in shipping or storage. Make certain the
body interior is clean.
3. Before installing the valve, inspect the pipe line and mating flanges, making sure the pipe is free of foreign
material and the flanges are clean and have no burrs or pits that could cause leakage.
4. Due to stainless steel castings, machining tolerances, and flange thickness, the body tapped hole depth may
vary slightly from valve to valve. It is therefore recommended that all knife gate valves be installed with
stainless steel ASTM A-304-B8 studs or ASTM A-316-B-8M studs. The use of carbon steel B-7 studs may
also be considered. We further recommend the use of Teflon thread compound.
For Stainless
Steel Lined
Valves,
STUDS ONLY
are highly
recommended
Damage to liner
can result if cap
screws are used.
NOTE: The use of cap screws or bolts may harm the chest in the knife gate by bottoming out and
Valve
Stud *
Size
Diameter
2"
5/8"
5/8"
2-1/2"
3"
5/8"
DOC: IOM_FNWKGV_ ver_12-2018
INSTALLATION, OPERATION & MAINTENANCE
INSTRUCTIONS
INTRODUCTION
INSTALLATION
should never be used on this area of the knife gate valve.
STUD SIZES FOR FLANGE BOLTING
Valve
Stud *
Valve
Size
Diameter
Size
4"
5/8"
10"
6"
3/4"
12"
8"
3/4"
14"
6500 KNIFE GATE VALVES
Stud *
Valve
Stud *
Diameter
Size
Diameter
7/8"
16"
1"
7/8"
18"
1-1/8"
1"
20"
1-1/8"
Valve
Stud *
Size
Diameter
24"
1-1/4"
30"
1-1/4"
* Nation al Coarse
Page 1 of 7
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Summary of Contents for FNW 6500
- Page 1 Release process pressure d. Drain the process fluid from the valve site 1. If the valve was supplied with an actuator, secondary support may be necessary. Contact FNW for recommendations. 2. Before installing the valve, inspect the valve body port and associated equipment for any damage that may have occurred and for any foreign matter that may have collected in shipping or storage.
- Page 2 6500 KNIFE GATE VALVES 5. The FNW Knife Gate is manufactured with ANSI B 16.5 - 150# raised face flange dimensions. The use of a suitable gasket between the body and the pipe line flange shall be selected by the customer. We recommend the use of a PTFE gasket.
-
Page 3: Operation
Drain the process fluid from the valve. 1. NORMAL MAINTENANCE - Normal maintenance of FNW knife gate valves may only include a periodic tightening of the packing gland. Should a leak occur at the packing gland, simply tighten the packing gland bolt closest to the leak. - Page 4 ALTERNATE use a solvent to clean the stuffing box. JOINTS AT 90° OR g. Use precut packing kits, purchased from FNW, or carefully 180° INTERVALS cut each ring by wrapping a length of packing around the blade snugly, but without tension. With packing snips, cut each ring individually, making 45º...
- Page 5 INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS 6500 KNIFE GATE VALVES b. Bidirectional Perimeter Seats A. Disassemble the entire valve and remove old packing as described above. B. Remove the old seat and clean seat body cavity with a wire brush and a solvent, making sure the entire cavity is clean of foreign matter.
- Page 6 INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS 6500 KNIFE GATE VALVES G. Tighten the retainer ring bolts using the cross-over method describe in step 8 of the installation instructions. H. Using a straight edge, tighten the bolts till the retainer rings are flush with the valve body as shown in figure 8.
-
Page 7: Warranty
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS 6500 KNIFE GATE VALVES WARRANTY 1. LIMITED WARRANTY: Subject to the limitations expressed herein, Seller warrants that products manufactured by Seller shall be free from defects in design, material and workmanship under normal use for a period of one (1) year from installation but in no case shall the warranty period extend longer than eighteen months from the date of sale.