Nil-Cor 310 Series Operating and maintenance manual

20-Feb-2012 4855 Broadmoor Ave. °Kentwood, MI 49512 °Phone: [phone] Catalog 411
Nil-Cor Swing Check Valves have been designed for easy installation, assembly and
maintenance. We recommend installation in piping systems with flat face flanges. The
all-FRP composite construction provides long, trouble free service in difficult corrosive
environments, both inside the valve and outside.
CAUTION: Refer to the Nil-Cor Corrosion Guide, Catalog 1000, to verify suitability for
chemical applications. Contact factory for assistance for chemicals not listed.
For Technical information and dimensions, please refer to the current edition of the
Nil-Cor Swing Check Valve Technical Specification
Nil-Cor Swing Check Valves
Installation, Maintenance and Operating Instructions
Series 310

20-Feb-2012 4855 Broadmoor Ave. °Kentwood, MI 49512 °Phone: [phone] Catalog 411
Site Storage Precautions
1. For outside site storage ensure valves or containers are
wrapped in plastic or otherwise protected from ingress of
dust or blowing sand. Do not remove flange covers.
2. Actuated or gear operated valves should be kept dry.
3. Inside warehouse storage requires no special protections.
Installation
1. Because 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. Take care to support the flapper as the valve is slid into the
line so that it does not come out of the retaining slot in the
body.
4. TFE envelope or 50 Durometer Elastomer gaskets are
recommended.
5. Flange bolts should be evenly tightened, using a torque
wrench, in cross rotation to prevent flange damage.
Removal 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. Isolate and depressurize the valve.
3. Secure valve to the lifting device using the lifting eye on
the valve.
4. Remove the flange bolts.
5. Take precautions to properly support pipeline.
6. Temporarily cap off exposed pipeline to prevent infiltration
of debris.
7. Take care to support the flapper as the valve is removed
from the line so that it does not come out of the retaining
slot in the body.
8. Carefully slide the valve from line.
Disassembly / Assembly
1. Inspect and clean all parts to make sure they are free of
dust, grit or other material
2. Check I.D. of mating flange on the flapper side to be sure
it falls between the Max. and Min. dimensions in the table
below.
3. Inspect flapper T-support and face sealing surface for
damage. Hand-dress any scratches using 200-grit emery
cloth. If the seating area of the flapper is heavily damaged,
it may be necessary to replace it in order to obtain a
satisfactory seal.
4. Inspect the body elastomer seat for damage. If damaged,
replace the seat.
5. Reinstall the flapper by inserting the T-support in the body
slot. Be certain that the sealing surface of the flapper lays
against the Viton seal in the body.
VALVE SIZE MIN “A” MAX “A”
3 2.85 3.20
4 3.75 4.20
6 5.70 6.20
8 7.60 7.80
10 9.60 10.20
12 11.50 12.20
Item Description Material
1Body Vinyl ester or Epoxy w/Glass
Fiber or Graphite Fiber
2Flapper Vinyl ester or Epoxy w/Glass
Fiber or Graphite Fiber
3Seat Ring Viton
4Lifting Eye 300-Series Stainless Steel
Shutoff Pressure/Temperature Rating
Wafer Swing Check
0
25
50
75
100
125
150
175
0 50 100 150 200
Temperature (oF)
Pressure (psig)
10
”
,12
”
3
”-
8
”
A