About Backflow-Prevention Valves
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Pipeline Fluid Blockers
Also known as pipe blinds, these fluid blockers fit between two flanges to stop flow, so you can work downstream without draining the system.
Paddle blinds slip between the flanges to temporarily block flow.
Spectacle blinds install permanently and rotate around the bolt to either block or open flow. However, they add extra weight to your pipeline.
304 stainless steel blinds resist corrosion better than steel blinds.
For technical drawings and 3-D models, click on a part number.
Paddle Blinds
Handle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size  | OD | For Orifice Flange ANSI Class | Max. Pressure | Thick. | Lg. | Wd. | Temp. Range, °F | Specifications Met | Each | |
Steel | ||||||||||
| 1/2 | 1 3/4" | 150 | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
| 3/4 | 2 1/8" | 150 | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 1 | 2 1/2" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 1 1/4 | 2 7/8" | 150 | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 1 1/2 | 3 1/4" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 2 | 4" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 2 1/2 | 4 3/4" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 3 | 5 1/4" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 3 1/2 | 6 1/4" | 150 | 150 psi @ 70° F | 3/8" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
| 4 | 6 3/4" | __ | 150 psi @ 70° F | 1/4" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 00000 |
| 6 | 8 5/8" | __ | 150 psi @ 70° F | 1/2" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
| 8 | 10 7/8" | __ | 150 psi @ 70° F | 5/8" | 7" | 1" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
| 10 | 13 1/4" | __ | 150 psi @ 70° F | 5/8" | 7" | 1 1/2" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
| 12 | 16" | __ | 150 psi @ 70° F | 3/4" | 7" | 1 1/2" | -20° to 100° | ASTM A36 | 0000000 | 000000 |
304 Stainless Steel | ||||||||||
| 8 | 11" | 150 | 150 psi @ 70° F | 1/4" | 7" | 1" | -100° to 400° | __ | 0000000 | 000000 |
| 10 | 13 3/8" | 150 | 150 psi @ 70° F | 3/8" | 7" | 1 1/2" | -100° to 400° | __ | 0000000 | 000000 |
| 12 | 16 1/8" | 150 | 150 psi @ 70° F | 3/8" | 7" | 1 1/2" | -100° to 400° | __ | 0000000 | 000000 |
PTFE-Coated 304 Stainless Steel | ||||||||||
| 1/2 | 1 7/8" | 150 | 150 psi @ 250° F | 1/8" | 2" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 3/4 | 2 1/4" | 150 | 150 psi @ 250° F | 1/8" | 2" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 1 | 2 5/8" | 150 | 150 psi @ 70° F | 1/8" | 2 3/4" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 1 1/2 | 3 3/8" | 150 | 150 psi @ 70° F | 1/8" | 2 3/4" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 2 | 4 1/8" | 150 | 150 psi @ 70° F | 1/8" | 3" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 3 | 5 3/8" | 150 | 150 psi @ 70° F | 1/8" | 3" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 00000 |
| 4 | 6 7/8" | 150 | 150 psi @ 70° F | 1/8" | 3" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 000000 |
| 6 | 8 3/4" | 150 | 150 psi @ 70° F | 3/16" | 5" | 3/4" | -100° to 400° | ASTM D4894, FDA Compliant 21 CFR 177.1550 | 0000000 | 000000 |
Spectacle Blinds
| For Pipe Size | ID | OD | For Orifice Flange ANSI Class | Max. Pressure | Thick. | End-to-End Lg. | Temp. Range, °F | Specifications Met | Each | |
Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 5/8" | 1 3/4" | 150 | 285 psi @ 70° F | 1/4" | 4 1/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 3/4 | 7/8" | 2 1/8" | 150 | 285 psi @ 70° F | 1/4" | 4 7/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 1 | 1" | 2 1/2" | 150 | 285 psi @ 70° F | 1/4" | 5 5/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 1 1/2 | 1 7/8" | 3 1/4" | 150 | 285 psi @ 70° F | 3/8" | 7 1/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 2 | 2 3/8" | 4" | 150 | 285 psi @ 70° F | 3/8" | 8 3/4" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 2 1/2 | 2 7/8" | 4 3/4" | 150 | 285 psi @ 70° F | 3/8" | 10 1/4" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 3 | 3 1/2" | 5 1/4" | 150 | 285 psi @ 70° F | 3/8" | 11 1/4" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 4 | 4 1/2" | 6 3/4" | 150 | 285 psi @ 70° F | 1/2" | 14 1/4" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 6 | 6 5/8" | 8 5/8" | 150 | 285 psi @ 70° F | 5/8" | 18 1/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 8 | 8 5/8" | 10 7/8" | 150 | 285 psi @ 70° F | 5/8" | 22 5/8" | -20° to 800° | ASTM A516 | 0000000 | 000000 |
| 10 | 10 3/4" | 13 1/4" | 150 | 285 psi @ 70° F | 3/4" | 27 1/2" | -20° to 800° | ASTM A105 | 0000000 | 000000 |
304 Stainless Steel | ||||||||||
| 1/2 | 5/8" | 1 3/4" | 150 | 230 psi @ 70° F | 1/4" | 4 1/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 3/4 | 7/8" | 2 1/8" | 150 | 230 psi @ 70° F | 1/4" | 4 7/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 1 | 1" | 2 1/2" | 150 | 230 psi @ 70° F | 1/4" | 5 5/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 1 1/2 | 1 7/8" | 3 1/4" | 150 | 230 psi @ 70° F | 3/8" | 7 1/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 2 | 2 3/8" | 4" | 150 | 230 psi @ 70° F | 3/8" | 8 3/4" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 2 1/2 | 2 7/8" | 4 3/4" | 150 | 230 psi @ 70° F | 3/8" | 10 1/4" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 3 | 3 1/2" | 5 1/4" | 150 | 230 psi @ 70° F | 3/8" | 11 1/4" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 4 | 4 1/2" | 6 3/4" | 150 | 230 psi @ 70° F | 1/2" | 14 1/4" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 6 | 6 5/8" | 8 5/8" | 150 | 230 psi @ 70° F | 5/8" | 18 1/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 8 | 8 5/8" | 10 7/8" | 150 | 230 psi @ 70° F | 5/8" | 22 5/8" | -20° to 800° | ASTM A240 | 0000000 | 000000 |
| 10 | 10 3/4" | 13 1/4" | 150 | 230 psi @ 70° F | 3/4" | 27 1/2" | -20° to 800° | ASTM A182 | 0000000 | 00000000 |