FNW 682 User Manual

Figure 682
CHECK VALVES
CAST IRON WAFER STYLE
DOUBLE DOOR CHECK VALVE
direction. The spring backing the
ceases prior to pressure reversal, therefore reducing slam or water hammer.
Features:
• 200 PSI Non-Shock
•Temperature Range -4°F to 176°F (-20°C to 80°C)
•Wafer Style
• Non-Slam (Spring Actuated) Check for Water or Clean Fluids
• Cast Iron Body & Stainless Steel Internal Components
• Drop Tight Resilient Seat
• Installation*
• Epoxy Coated Body
* When installed in the horizontal
position, the door hinge shaft must be in the vertical position for proper operation.
Use Flat-Faced Metal Flanges only.
Not for Steam Service
Standards:
• Inspection & Test: API 598
• Flange Drilling: ANSI B16.1 Class 125
• Flange Face Finish: MSS SP-6
•Markings: MSS SP-25
Cv & Weights Figure Number Matrix
Size Cv Wt. (Lbs)
2
2-1/2
3
4
5
6
8
10
12 781
22 2.87
33 4.63
52 6.39
87 9.48
133 14.11
198 20.06
335 33.51
562 58.42
81.57
2 = K 2-1/2 = L 3 = M
FNW 682 Size
SIZE CODE
4 = P 5 = S 6 = U
8 = X 10 = 10 12 = 12
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Figure 682
CHECK VALVES
DOUBLE DOOR CHECK VALVE
CAST IRON WAFER STYLE
Dimensions (Inches)
Size ØD ØD1 ØD2 L
2 4.13 2.36 1.50 2.13
2-1/2 4.88 2.87 1.89 2.13
3 5.39 3.50 2.52 2.24
4 6.97 4.49 3.43 2.52
5 7.76 5.51 4.02 2.76
6 8.74 6.61 5.12 2.99
8 10.98 8.62 6.97 3.74
10 13.39 10.75 8.50 4.25
12 16.14 12.76 10.24 5.59
Standard Materials
Ref.
Description Material Qty Remarks
No.
1 Body
2 Disc (Door)
3 Shaft
4 Seat NBR1Bonded to Body
5 Spring
6Washer PTFE 2 - 11 Varies According to Size
7 Shaft Seal NBR4
8 Hex Nut
9 Eye Bolt
Cast Iron ASTM
A126 Class B
Stainless Steel
ASTM A351 CF8M
Stainless Steel
SS316
Stainless Steel
SS316
Stainless Steel
SS304
Steel ASTM A193
Grade B7
1
2
2
1 - 2 Qty 2 on 6 to 12 Inch Valves
4
18 Inch and Larger
© 2019 FNW - We reserve the right to modify or improve the designs or specications of our products at any time without notice. 0119 1078398
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