OVERVIEW: The DD-SL stainless steel body, double disc swing lead free check valves use spring assisted half-discs to help keep slamming and surges to a minimum. It is available in 150#, 300#, 600#, and 900# pressure classes (contact factory for the higher pressure classes). The lug style body has flange holes that are threaded on both sides of the body, so that it can be used as a block valve for the pipeline.
It is suitable for frequent flow reversals, but not fluids with solids. Either metal, Buna-N, or Viton seats, with stainless steel discs. Discs are designed with very low cracking pressure, which reduces the amount of energy needed to open the valve.
The spring and discs are designed to allow the discs to lift linearly before pivoting to avoid the disc heal from scrubbing the sealing surface. Also, discs are equipped with cast-in shock bumpers that help to reduce wear and tear on internal components. The retainer-less body design eliminates potential leak pathes to the environment so there are no body emissions. Board, lapped sealing metal surface meets or exceeds API 598 test requirements. Resilient seats (Viton/Buna-N) ensure a bubble tight seal.
For clean liquids.
| MODEL | TYPE |
SIZE
(in)
|
ENDS | BODY MTL | SEAT | DISC | CLASS | Cv |
PRESS (WOG)
(psi)
|
WT
(lbs)
|
A
(in)
|
B
(in)
|
C
(in)
|
E
(in)
|
F
(in)
|
ITEM NO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DD-SL1 | DBL DISC | 2 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 62 | 275 | 8.0 | 2.38 | 2.0 | 2.16 | 4.75 | 0.94 | VCDD-SL1SXT0200 |
| DD-SL1 | DBL DISC | 2.5 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 110 | 275 | C/F | 2.62 | 2.50 | 2.67 | 5.5 | 1.69 | VCDD-SL1SXT0250 |
| DD-SL1 | DBL DISC | 3 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 175 | 275 | 16.0 | 2.88 | 3.00 | 3.23 | 6.0 | 2.36 | VCDD-SL1SXT0300 |
| DD-SL1 | DBL DISC | 4 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 350 | 275 | 28.0 | 2.88 | 4.00 | 4.25 | 7.5 | 3.54 | VCDD-SL1SXT0400 |
| DD-SL1 | DBL DISC | 5 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 550 | 275 | C/F | 3.38 | 5.00 | 5.12 | 8.5 | 4.45 | VCDD-SL1SXT0500 |
| DD-SL1 | DBL DISC | 6 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 850 | 275 | 50.0 | 3.87 | 6.52 | 6.38 | 9.5 | 5.31 | VCDD-SL1SXT0600 |
| DD-SL1 | DBL DISC | 8 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 1500 | 275 | 95.0 | 5.00 | 8.00 | 8.66 | 11.75 | 7.13 | VCDD-SL1SXT0800 |
| DD-SL1 | DBL DISC | 10 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 2400 | 275 | 150.0 | 5.75 | 10.00 | 10.63 | 14.25 | 8.82 | VCDD-SL1SXT1000 |
| DD-SL1 | DBL DISC | 12 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 3700 | 275 | 242.0 | 7.12 | 12.00 | 12.60 | 17.0 | 10.47 | VCDD-SL1SXT1200 |
| DD-SL1 | DBL DISC | 14 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 5400 | 275 | C/F | 7.25 | 13.26 | 13.78 | C/F | 11.81 | VCDD-SL1SXT1400 |
| DD-SL1 | DBL DISC | 16 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 8250 | 275 | C/F | 7.50 | 15.24 | 15.75 | 21.25 | 14.29 | VCDD-SL1SXT1600 |
| DD-SL1 | DBL DISC | 18 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 10400 | 275 | C/F | 8.00 | 17.24 | 17.24 | C/F | 15.87 | VCDD-SL1SXT1800 |
| DD-SL1 | DBL DISC | 20 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 14200 | 275 | C/F | 8.62 | 19.50 | 19.50 | 25.0 | 18.03 | VCDD-SL1SXT2000 |
| DD-SL1 | DBL DISC | 24 | LUG | STAINLESS STEEL | STAINLESS STEEL | STAINLESS STEEL | 150 | 23000 | 275 | C/F | 8.75 | 23.42 | 23.42 | 29.5 | 22.28 | VCDD-SL1SXT2400 |
| DD-SL1 | DBL DISC | 2 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 62 | 275 | 8.0 | 2.38 | 2.00 | 2.16 | 4.75 | .94 | VCDD-SL1SVT0200 |
| DD-SL1 | DBL DISC | 2.5 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 110 | 275 | C/F | 2.62 | 2.50 | 2.67 | 5.5 | 1.69 | VCDD-SL1SVT0250 |
| DD-SL1 | DBL DISC | 3 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 175 | 275 | 16.0 | 2.88 | 3.00 | 3.23 | 6.0 | 2.36 | VCDD-SL1SVT0300 |
| DD-SL1 | DBL DISC | 4 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 350 | 275 | 28.0 | 2.88 | 4.00 | 4.25 | 7.5 | 3.54 | VCDD-SL1SVT0400 |
| DD-SL1 | DBL DISC | 5 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 550 | 275 | C/F | 3.38 | 5.00 | 5.12 | 8.5 | 4.45 | VCDD-SL1SVT0500 |
| DD-SL1 | DBL DISC | 6 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 850 | 275 | 50.0 | 3.87 | 6.52 | 6.38 | 9.5 | 5.31 | VCDD-SL1SVT0600 |
| DD-SL1 | DBL DISC | 8 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 1500 | 275 | 95.0 | 5.00 | 8.00 | 8.66 | 11.75 | 7.13 | VCDD-SL1SVT0800 |
| DD-SL1 | DBL DISC | 10 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 2400 | 275 | 150.0 | 5.75 | 10.00 | 10.63 | 14.25 | 8.82 | VCDD-SL1SVT1000 |
| DD-SL1 | DBL DISC | 12 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 3700 | 275 | 242.0 | 7.12 | 12.00 | 12..60 | 17.0 | 10.47 | VCDD-SL1SVT1200 |
| DD-SL1 | DBL DISC | 14 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 5400 | 275 | C/F | 7.25 | 13.26 | 13.78 | C/F | 11.81 | VCDD-SL1SVT1400 |
| DD-SL1 | DBL DISC | 16 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 8250 | 275 | C/F | 7.50 | 15.24 | 15.75 | 21.25 | 14.29 | VCDD-SL1SVT1600 |
| DD-SL1 | DBL DISC | 18 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 10400 | 275 | C/F | 8.00 | 17.24 | 17.24 | C/F | 15.87 | VCDD-SL1SVT1800 |
| DD-SL1 | DBL DISC | 20 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 14200 | 275 | C/F | 8.62 | 19.50 | 19.50 | 25.0 | 18.03 | VCDD-SL1SVT2000 |
| DD-SL1 | DBL DISC | 24 | LUG | STAINLESS STEEL | VITON | STAINLESS STEEL | 150 | 23000 | 275 | C/F | 8.75 | 23.42 | 23.42 | 29.5 | 22.28 | VCDD-SL1SVT2400 |