Nil-Cor 310 Series Operating and maintenance manual

8/31/07 Pub. 410 www.nilcor.com
Nil-Cor Check Valves have been designed for easy installation, assembly and
maintenance. We recommend installation in piping systems with flat face flanges. When
installing against raised face flanges, spacer rings should be used to provide a flat
surface to the face of the valve flange. The ball and seat assembly are retained by a
threaded body insert that can be removed for inspection and can be serviced by
qualified maintenance personnel.
CAUTION: Refer to the Nil-Cor Corrosion Guide, Catalog 1000, to verify suitability for
chemical a
pp
lications. Contact factor
y
for assistance for chemicals not listed.
Serial Number
Date Code
Prior to Jan. 2,
2000
Serial Number
Date Code
After Jan. 2,
2000
Nil-Cor Flanged Ball Check Valves
Installation, Maintenance and Operating Instructions
Series 300, 310 and 410

8/31/07 Pub. 410 www.nilcor.com
Installation
1) Because Nil-Cor Check Valves are unidirectional, it is important to ensure that the arrow on valve points in the direction of free flow.
2) Pipe must be properly aligned and provisions made to minimize stress from thermal expansion. Always review pipe
manufacturer’s recommendations.
3) TFE envelope or 50 Durometer Rubber gaskets are recommended.
4) Flange bolts should be evenly torqued, using a torque wrench, in cross rotation to prevent flange damage. We recommend
installation in piping systems with flat face flanges. When installing against raised face flanges, spacer rings should be
used to provide a flat surface to the face of the valve flange. Bolts should be lubricated for ease of installation.
Removal/Disassembly
For your safety, it is important that these precautions be taken before removal of the valve from the line or before disassembly:
1) Wear protective clothing or equipment appropriate for the particular fluid.
2) Observe the precautions and follow the procedures in Disassembly Item 1.
Disassembly
1) Isolate and depressurize the valve.
a. Take precaution to properly support pipeline.
b. Temporarily cap off exposed pipeline to prevent infiltration of debris.
2) Remove valve from line.
3) Use insert removal tool to remove threaded insert. Remove ball.
Assembly
1) Inspect and clean all parts to make sure they are free of dust, grit or other material. New O-ring and ball seat
should be used after the valve has been in service. Inspect seat and body retainer rings for damage. If damaged, a complete
seat kit should be used.
2) A good lubricant compatible with fluid service should be applied lightly to seat, seal and body insert threads.
3) Replace ball.
4) Screw body insert into the valve body (flange serrations between body and insert are flush when properly installed). Tighten to torque
values in table below.
Item Description Material
1Body Vinyl ester w/Glass Fiber or Graphite Fiber/Polysulfone w/Glass
Fiber
2Ball Solid Virgin PTFE
3Seat O-Ring PTFE Coated Viton
4Body O-Ring PTFE Coated Viton
5Body Insert Vinyl ester w/Glass Fiber or Graphite Fiber/Polysulfone w/Glass
Fiber
Valve Size Flange Bolt Torque Range
(ft. lbs.) Insert Tightening Torque (ft. lbs.)
1” 20-30 4
1.5” 20-30 6
2” 20-45 8
3” 25-50 14
4” 25-50 20
Pressure-Temperature Rating
0
50
100
150
200
250
300
-50 0 50 100 150 200 250 300 350
Temperature (oF)
Pressure (psig)
1"- 4"