BLADDER TANK AND RATIO-FLOW CONTROLLER INVESTIGATED TO UL 162. 50 to 4000 gal capacity ASME for vertical and horizontal installation.
Following are equivalent length valves for the controllers : (Models SFD-U2-BTRFC, SFD-U3BTRFC, SFD-U4 BTRFC, SD-U6-BTRFC, SFD-U8-BTRFC) based on a roughness factor of 130 and schedule 40 steel pipes.
| MODEL NO. | EQUIVALENT LENGTH FT |
| SFD-U2-BTRFC / SFD-BTRC-2 | 22.0 / 9.07 |
| SFD-U3-BTRFC / SFD-BTRC-3 | 17.5 / 14.48 |
| SFD-U4-BTRFC / SFD-BTRC-4 | 29.3 / 15.29 |
| SFD-U6-BTRFC | 24.9 |
| SFD-U8-BTRFC | 23.0 |
