About Backflow-Prevention Valves
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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How to Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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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.
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 |
| 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 |
Flange-Mount Flow-Control Orifices
- For Use With: Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon
- Max. Pressure: 740 psi @ 100° F
- Temperature Range: -20° to 950° F
Also known as orifice plates, these mount between orifice flange unions. They are used to throttle, vent, bleed, or regulate the flow of liquids and gases.
For technical drawings and 3-D models, click on a part number.
For Orifice Flange | Handle | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Flange Pipe Size | For Pipe Schedule | ANSI Class | Surface | Orifice Dia. | Water Flow | Air Flow | Lg. | Thick. | OD | Ht. | Wd. | Each | |
304 Stainless Steel Body | |||||||||||||
| 3/4 | 40 | 300 | Raised | 0.412" | 6.13 gpm @ 40 psi | 44 scfm @ 40 psi | 7 5/8" | 1/8" | 2 5/8" | 5" | 1 1/2" | 0000000 | 0000000 |
| 1 | 40 | 300 | Raised | 0.525" | 9.9 gpm @ 40 psi | 71.2 scfm @ 40 psi | 7 7/8" | 1/8" | 2 7/8" | 5" | 1 1/2" | 0000000 | 000000 |
| 1 1/2 | 40 | 300 | Raised | 0.805" | 23.2 gpm @ 40 psi | 167 scfm @ 40 psi | 8 3/4" | 1/8" | 3 3/4" | 5" | 1 1/2" | 0000000 | 000000 |
| 2 | 40 | 300 | Raised | 1.034" | 38.11 gpm @ 40 psi | 274.7 scfm @ 40 psi | 9 3/8" | 1/8" | 4 3/8" | 5" | 1 1/2" | 0000000 | 000000 |
| 3 | 40 | 300 | Raised | 1.534" | 83.56 gpm @ 40 psi | 602.8 scfm @ 40 psi | 10 7/8" | 1/8" | 5 7/8" | 5" | 1 1/2" | 0000000 | 000000 |
| 4 | 40 | 300 | Raised | 2.013" | 143.75 gpm @ 40 psi | 1,037.5 scfm @ 40 psi | 12 1/8" | 1/8" | 7 1/8" | 5" | 1 1/2" | 0000000 | 000000 |
Flow-Control Flange Unions
Measure, throttle, and regulate the flow of liquids and gases in your line by adding an orifice plate to these unions. They consist of two flange halves, plus all of the components needed to connect them together. Tighten the jack bolts to separate the flange halves to inspect or replace the orifice plate.
To throttle flow, mount an orifice plate between the two flanges. The orifice plate restricts the flow in order to regulate it.
To measure flow, build the same assembly, except you’ll also connect a differential pressure gauge or transmitter to both flange halves using the threaded ports. Your gauge or transmitter will measure the difference between the pressure before and after the orifice plate. The pressure difference is proportional to flow rate, so you can use that measurement to calculate your line’s flow rate.
Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld. Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
316/316L stainless steel flanges have excellent corrosion resistance.
Flanges that meet ASME B16.36 adhere to specifications and testing requirements for temperature and pressure ratings, dimensions, materials, and tolerances.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
- Temperature Range: Not Rated
- Specifications Met: See table
- Pressure Class: 300
- Fittings:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel - Pipe Nipples and Pipe:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel
Bolt Hole | Port | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Construction | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Pipe Size | No. of | Includes | Specifications Met | Each | |
Carbon Steel | ||||||||||||
| 3/4 | Seamless | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 0000000 |
| 1 | Seamless | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | Seamless | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | Seamless | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | Seamless | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | Seamless | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||||
| 3/4 | Seamless | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 000000 |
| 1 | Seamless | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | Seamless | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | Seamless | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | Seamless | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | Seamless | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
- For Use With: Air, Natural Gas, Oil, Water
- Temperature Range: Not Rated
- Specifications Met: See table
- Pressure Class: 300
- Fittings:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel - Pipe Nipples and Pipe:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel
Bolt Hole | Port | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Pipe Size | No. of | Includes | Specifications Met | Each | |
Carbon Steel | |||||||||||
| 3/4 | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 0000000 |
| 1 | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
316/316L Stainless Steel | |||||||||||
| 3/4 | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 000000 |
| 1 | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
| 4 | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |