About Backflow-Prevention Valves
More
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.
More
About On/Off Valves
More
Butt-Weld On/Off Valves
- Valve Type: Ball
- For Use With: Argon, Helium, Krypton, Neon, Oil, Steam, Water, Xenon
- Seal Material: PTFE Plastic
Weld these valves to unthreaded metal pipe for a permanent, flush connection that permits smooth flow through a line. To access internal components without disturbing welded connections, disassemble the three-piece bolted body inline. Valves are cleaned and bagged for high-purity applications such as oxygen service. All have a 316 stainless steel body for excellent corrosion resistance. The lockable lever handle can be fixed in place using a padlock (not included) with a shackle diameter up to 5/16”. These valves are full port, so they do not restrict flow.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temperature Range, °F | Vacuum Rating, in. of Hg | End-to-End Lg. | For Max. Shackle Dia. | Each | |
316 Stainless Steel Body | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Butt Weld × Butt Weld | |||||||||
| 1/2 | 26 | 1440 psi @ 100° F | 250 psi @ 400° F | -50° to 400° | 29 | 3 13/16" | 5/16" | 0000000 | 0000000 |
| 3/4 | 51 | 1440 psi @ 100° F | 250 psi @ 400° F | -50° to 400° | 29 | 4 11/16" | 5/16" | 0000000 | 000000 |
| 1 | 68 | 1440 psi @ 100° F | 250 psi @ 400° F | -50° to 400° | 29 | 5 3/16" | 5/16" | 0000000 | 000000 |
| 1 1/2 | 170 | 1440 psi @ 100° F | 250 psi @ 400° F | -50° to 400° | 29 | 6" | 5/16" | 0000000 | 00000000 |
| 2 | 376 | 1440 psi @ 100° F | 250 psi @ 400° F | -50° to 400° | 29 | 6 13/16" | 5/16" | 0000000 | 00000000 |
On/Off Valves with Butt-Weld Fittings for Food and Beverage
- Valve Type: Ball
- For Use With: Food, Beverage
- Seal Material: PTFE Plastic
Weld these valves to unthreaded metal pipe for a permanent, flush connection that permits smooth flow through a line. For easy cleaning in food and beverage systems, they have polished internal surfaces and a three-piece bolted body that disassembles inline for access to internal components without cutting welded connections. All valves have a lockable lever handle that can be fixed in place using a padlock (not included). They are full port, so they do not restrict flow.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Max. Pressure | Temperature Range, °F | End-to-End Lg. | For Max. Shackle Dia. | Each | |
316 Stainless Steel Body | ||||||
|---|---|---|---|---|---|---|
Butt Weld × Butt Weld | ||||||
| 1/2" | 1000 psi @ 150° F | 0° to 300° | 4 5/16" | 1/4" | 000000000 | 0000000 |
| 3/4" | 1000 psi @ 150° F | 0° to 300° | 4 11/16" | 1/4" | 000000000 | 000000 |
| 1" | 1000 psi @ 150° F | 0° to 300° | 5" | 1/4" | 000000000 | 000000 |
| 1 1/2" | 1000 psi @ 150° F | 0° to 300° | 5 5/8" | 9/32" | 000000000 | 000000 |
| 2" | 1000 psi @ 150° F | 0° to 300° | 6 7/16" | 9/32" | 000000000 | 000000 |
| 3" | 800 psi @ 150° F | 0° to 300° | 9" | 3/8" | 000000000 | 00000000 |
Butt-Weld Check Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: 316 Stainless Steel
- Spring Material: 316 Stainless Steel
- Seal Material: Viton® Fluoroelastomer
Weld these valves to unthreaded pipe for a smooth, flush connection that provides maximum flow. All open to allow flow in one direction and close when flow stops or reverses. They have a 316 stainless steel body for excellent corrosion resistance.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | For Pipe Schedule | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Specifications Met | Each | |
316 Stainless Steel Body | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Butt Weld × Butt Weld | |||||||||
| 1/2 | 40 | 2.4 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 3/16" | ANSI/ASME B16.25 | 0000000 | 0000000 |
| 3/4 | 40 | 4.4 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 11/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 1 | 40 | 6.1 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 15/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 1 1/2 | 40 | 18.8 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 3 15/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 2 | 40 | 32 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 4 3/8" | ANSI/ASME B16.25 | 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. 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 |