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
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