About Gradual On/Off Valves
More
Flanged Gradual On/Off Valves
Handle, Nonrising
Stem, and Four Bolt Holes
Handle, Nonrising
Stem, and Eight Bolt Holes
Rising Stem, and
Four Bolt Holes
Rising Stem, and
Eight Bolt Holes
Rising Stem, and
Eight Bolt Holes
Bolt these valves to flanges. They gradually open and close to prevent system damage from suddenly starting and stopping flow.
Epoxy-coated cast iron valves are more corrosion resistant than plain cast iron or steel valves.
316 stainless steel valves have the best corrosion resistance.
Wheel handles open and close with multiple turns, providing more controlled, shock-resistant flow than pull handles.
Pull handles open and close faster than wheel handles.
Nonrising stems stay in the same position whether the valve is open or closed. Valves with nonrising stems are often used underground and in other low-clearance locations.
Rising stems lift as the valve opens and lower as the valve closes to provide a visual indication of whether flow is on or off. The stem is isolated from the process media for a longer service life than valves with a nonrising stem.
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.
- Valve Type: Gate
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Pressure Class | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 2 | 3/4" | 6" | 4 3/4" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7" | 14" | 7" | 00000000 | 0000000 |
| 2 1/2 | 3/4" | 7" | 5 1/2" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7 1/2" | 16" | 7 1/2" | 00000000 | 000000 |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 8" | 17 1/4" | 8" | 00000000 | 000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 9" | 20 1/4" | 9" | 00000000 | 000000 |
| 6 | 7/8" | 11" | 9 1/2" | 8 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 10 1/2" | 26 1/2" | 10 1/2" | 00000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Pressure Class | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 2 | 3/4" | 6" | 4 3/4" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7" | 19 5/16" | 7" | 0000000 | 0000000 |
| 2 1/2 | 3/4" | 7" | 5 1/2" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7 1/2" | 20 11/16" | 7 1/2" | 0000000 | 000000 |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 8" | 23 1/4" | 8" | 0000000 | 000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 9" | 28 1/2" | 9" | 0000000 | 000000 |
| 6 | 7/8" | 11" | 9 1/2" | 8 | 125 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 10 1/2" | 32 1/8" | 10" | 0000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam
- Packing Material: Graphite
- Specifications Met: American Petroleum Institute Standard 600, ASTM A216 WCB
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Pressure Class | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 2 | 3/4" | 6" | 4 3/4" | 4 | 150 | 285 psi @ 100° F | 150 psi @ 365° F | -20° to 800° | 7" | 19 3/8" | 7" | 00000000 | 0000000 |
| 2 1/2 | 3/4" | 7" | 5 1/2" | 4 | 150 | 285 psi @ 100° F | 150 psi @ 365° F | -20° to 800° | 7 1/2" | 19 7/8" | 7 1/2" | 00000000 | 000000 |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 150 | 285 psi @ 100° F | 150 psi @ 365° F | -20° to 800° | 8" | 24" | 8" | 00000000 | 000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 150 | 285 psi @ 100° F | 150 psi @ 365° F | -20° to 800° | 9" | 27 1/2" | 9" | 00000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water, Air
- Specifications Met: ASME B16.10, ASTM A126 Class B, AWWA C509, MSS-SP-70
O'all | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Pressure Class | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 125 | 200 psi @ 140° F | 35° to 140° | 8" | 14" | 8" | 00000000 | 0000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 125 | 200 psi @ 140° F | 35° to 140° | 9" | 17" | 9" | 00000000 | 000000 |
| 6 | 7/8" | 11" | 9 1/2" | 8 | 125 | 200 psi @ 140° F | 35° to 140° | 10 1/2" | 22 5/16" | 10 1/2" | 00000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water, Air
- Specifications Met: ASME B16.10, ASTM A126 Class B, AWWA C509, FM Approved, MSS-SP-70, UL Listed
O'all | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Pressure Class | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 2 1/2 | 3/4" | 7" | 5 1/2" | 4 | 125 | 200 psi @ 140° F | 35° to 140° | 7 1/2" | 17 3/8" | 7 1/2" | 00000000 | 000000000 |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 125 | 200 psi @ 140° F | 35° to 140° | 8" | 19 3/8" | 8" | 00000000 | 00000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 125 | 200 psi @ 140° F | 35° to 140° | 9" | 22 3/4" | 9" | 00000000 | 00000000 |
| 6 | 7/8" | 11" | 9 1/2" | 8 | 125 | 200 psi @ 140° F | 35° to 140° | 10 1/2" | 29 1/4" | 10 1/2" | 00000000 | 00000000 |
| 8 | 7/8" | 13 1/2" | 11 3/4" | 8 | 125 | 200 psi @ 140° F | 35° to 140° | 11 1/2" | 36" | 11 1/2" | 00000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam
- Packing Material: PTFE Plastic
- Specifications Met: American Petroleum Institute Standard 603, ASME B16.34
O'all | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 1 | 1/2" | 4 1/4" | 3 1/8" | 4 | 80 | 150 | 275 psi @ 100° F | 150 psi @ 365° F | 0° to 375° | 5" | 11 5/16" | 4 3/4" | 00000000 | 0000000 |
| 1 1/2 | 1/2" | 5" | 3 7/8" | 4 | 300 | 150 | 275 psi @ 100° F | 150 psi @ 365° F | 0° to 375° | 6 1/2" | 14 5/16" | 7 7/8" | 00000000 | 000000 |
| 2 | 3/4" | 6" | 4 3/4" | 4 | 360 | 150 | 275 psi @ 100° F | 150 psi @ 365° F | 0° to 375° | 7" | 16" | 7 7/8" | 00000000 | 000000 |
| 3 | 3/4" | 7 1/2" | 6" | 4 | 1,150 | 150 | 275 psi @ 100° F | 150 psi @ 365° F | 0° to 375° | 8" | 22 1/4" | 9 13/16" | 00000000 | 00000000 |
| 4 | 3/4" | 9" | 7 1/2" | 8 | 2,150 | 150 | 275 psi @ 100° F | 150 psi @ 365° F | 0° to 375° | 9" | 25 15/16" | 9 13/16" | 00000000 | 00000000 |
- Valve Type: Gate
- For Use With: Oil, Air, Argon, Helium, Krypton, Neon, Xenon
- Packing Material: Graphite
O'all | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Bolt Hole Dia. | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolts Included | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
| 4 | 3/4" | 9" | 7 1/2" | 8 | No | 685 | 125 | 10 psi @ 1000° F | -40° to 1000° | 5 1/4" | 15 5/8" | 6" | 0000000 | 0000000 |
| 6 | 7/8" | 11" | 9 1/2" | 8 | No | 2,150 | 125 | 5 psi @ 1000° F | -40° to 1000° | 5 3/4" | 20" | 8" | 0000000 | 00000000 |
Flanged Gradual On/Off Valves for Thick Liquids and Dry Materials
- Valve Type: Gate
- For Use With: Air, Argon, Deionized Water, Ethanol, Ethylene Glycol, Helium, Isopropyl Alcohol, Krypton, Methanol, Neon, Nitrogen, Salt Water, Soap Solutions, Water, Xenon
These valves have a sharp gate that slices through thick slurries, wastewater, dry bulk solids, and other materials that would clog other gradual on/off valves. They bolt to flanges and gradually open and close to prevent system damage from suddenly starting and stopping flow. The wheel handle opens and closes the valve with multiple turns, providing controlled, shock-resistant flow. The rising stem lifts as the valve opens and lowers as the valve closes to provide a visual indication of whether flow is on or off. The stem is isolated from the process media for a long service life.
For technical drawings and 3-D models, click on a part number.
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | Bolt Hole Dia. | Bolt Circle Dia. | No. of Bolt Holes | Bolts Included | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Stem Type | Each | |
Cast Iron Body—316 Stainless Steel Gate | |||||||||||||
| 3 | 7 1/2" | 5/8" | 6" | 4 | No | 150 psi @ 248° F | -22° to 248° | 2 1/4" | 23" | 7 1/16" | Rising | 0000000 | 000000000 |
| 4 | 9" | 5/8" | 7 1/2" | 8 | No | 150 psi @ 248° F | -22° to 248° | 2 1/4" | 29 7/16" | 6 3/4" | Rising | 0000000 | 00000000 |
| 6 | 11" | 3/4" | 9 1/2" | 8 | No | 150 psi @ 248° F | -22° to 248° | 2 1/2" | 34 7/16" | 9 3/8" | Rising | 0000000 | 00000000 |