About Gradual On/Off Valves
More
Flanged Gradual On/Off Valves
Nonrising Stem, and
Four Bolt Holes
Nonrising Stem, and
Eight Bolt Holes
Rising Stem, and
Eight Bolt Holes
Easier to install and remove than threaded or weld-on valves, these valves bolt to flanges. They’re often used in lines requiring frequent cleaning and maintenance, such as those for slurries. They open and close gradually, preventing system damage from sudden starts and stops in flow. Also known as gate valves.
Valves with a wheel handle open and close with multiple turns, providing more controlled, shock-resistant flow than valves with a pull handle.
Valves with a nonrising stem keep the handle in the same position whether they’re open or closed. They're often used in low-clearance locations. Valves with a rising stem lift the handle as they open and lower it as they close. At a glance, you can see if flow is on or off. The stem is isolated from what’s flowing through your line, giving these valves a longer lifespan than valves with a nonrising stem. This makes them good for critical lines and lines that need to be opened and closed frequently.
Cast iron valves are stronger than steel valves but more brittle than steel, ductile iron, and stainless steel valves.
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.
- Valve Type: Gate
- For Use With: Water, Oil, Steam
- Specifications Met: ASME B16.10, MSS-SP-70
O'all | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Pressure Class | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
Flanged Stem Housing | |||||||||||||||
| 2 | 125 | 6" | 4 3/4" | 4 | 3/4" | No | 215 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7" | 14" | 7" | 00000000 | 0000000 |
| 2 1/2 | 125 | 7" | 5 1/2" | 4 | 3/4" | No | 335 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 7 1/2" | 16" | 7 1/2" | 00000000 | 000000 |
| 3 | 125 | 7 1/2" | 6" | 4 | 3/4" | No | 510 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 8" | 17 1/4" | 8" | 00000000 | 000000 |
| 4 | 125 | 9" | 7 1/2" | 8 | 3/4" | No | 945 | 200 psi @ 150° F | 125 psi @ 350° F | -20° to 450° | 9" | 20 1/4" | 9" | 00000000 | 000000 |
| 6 | 125 | 11" | 9 1/2" | 8 | 7/8" | No | 2,250 | 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, Steam
- Specifications Met: ASME B16.10, MSS-SP-70
O'all | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Pressure Class | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
Flanged Stem Housing | |||||||||||||||
| 8 | 125 | 13 1/2" | 11 3/4" | 8 | 3/4" | No | Not Rated | 200 psi @ 100° F | 125 psi @ 350° F | -20° to 100° | 11 1/2" | 28 1/2" | 13 3/4" | 000000000 | 000000000 |
- Valve Type: Gate
- For Use With: Water, Oil, Air, Steam
- Specifications Met: ASME B16.10, MSS-SP-70
O'all | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Pressure Class | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
Flanged Stem Housing | |||||||||||||||
| 8 | 125 | 13 1/2" | 11 3/4" | 8 | 3/4" | No | Not Rated | 200 psi @ 100° F | 125 psi @ 350° F | -20° to 100° | 11 1/2" | 35 7/8" | 13 3/4" | 00000000 | 000000000 |
FM-Approved Flanged Gradual On/Off Valves
FM-approved, these valves are often used to isolate sections of your facility’s water supply for fire suppression and protection. They bolt to flanges for easier installation and removal than threaded or weld-on valves. This makes them a great choice if you have to clean and maintain your line frequently. Also known as gate valves, they open and close gradually to prevent sudden starts and stops of flow that could damage your system. Epoxy coated, these valves resist corrosion. They’re bright red, so they’re easy to identify as fire valves.
Their rubber-coated gate, also known as a resilient wedge, compresses against the valve for a long-lasting, leakproof seal. It seals tightly even if you install these valves vertically, or if there’s low back pressure. For easy disassembly during maintenance, they have a flanged stem housing that bolts in place. However, the housing makes these valves heavier and larger than valves with a threaded or welded stem housing.
Valves with a wheel handle open and close with multiple turns for controlled, shock-resistant flow. Valves with a rising stem lift the handle as they open and lower it as they close. At a glance, you can see if flow is on or off. The stem is isolated from what’s flowing through your line, giving these valves a longer lifespan than valves with a nonrising stem. This makes them good for critical lines and lines that need to be opened and closed frequently.
- Valve Type: Gate
- For Use With: Air, Water
- Specifications Met: ASME B16.10, ASTM A126 Class B, AWWA C509, FM Approved, MSS-SP-70, UL Listed
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Pressure Class | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
Flanged Stem Housing | |||||||||||||
| 2 1/2 | 125 | 7" | 5 1/2" | 4 | 3/4" | No | 200 psi @ 140° F | 35° to 140° | 7 1/2" | 17 3/8" | 7 1/2" | 00000000 | 0000000 |
| 3 | 125 | 7 1/2" | 6" | 4 | 3/4" | No | 200 psi @ 140° F | 35° to 140° | 8" | 19 3/8" | 8" | 00000000 | 00000000 |
| 4 | 125 | 9" | 7 1/2" | 8 | 3/4" | No | 200 psi @ 140° F | 35° to 140° | 9" | 22 3/4" | 9" | 00000000 | 00000000 |
| 6 | 125 | 11" | 9 1/2" | 8 | 7/8" | No | 200 psi @ 140° F | 35° to 140° | 10 1/2" | 29 1/4" | 10 1/2" | 00000000 | 00000000 |
| 8 | 125 | 13 1/2" | 11 3/4" | 8 | 7/8" | No | 200 psi @ 140° F | 35° to 140° | 11 1/2" | 36" | 11 1/2" | 00000000 | 00000000 |
Tight-Seal Flanged Gradual On/Off Valves
A rubber-coated gate, also known as a resilient wedge, compresses against the valve seat to give these valves a tight, leakproof seal. They shut tight even when they’re installed vertically, have low back pressure, or the liquid contains solids and debris. Often called gate valves, they open and close gradually to prevent sudden starts and stops that can damage your system. Since they bolt onto flanges, they’re easier to install and remove than threaded and weld-on valves. This makes them a good choice for lines that need frequent cleaning and maintenance. You can use them in lines for water supply, reclamation, and wastewater treatment—they meet AWWA (American Water Works Association) specifications. To protect against corrosion, the body is coated with epoxy.
The stem is nonrising, so it stays in the same position whether the valve is open or closed. They’re often used in low-clearance spots. Their flanged stem housing bolts in place to make them easy to take apart for repairs. However, the flanged stem housing makes these valves heavier and larger than valves with threaded or welded stem housings.
For technical drawings and 3-D models, click on a part number.
- 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 | Pressure Class | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Flow Coefficient (Cv) | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
Flanged Stem Housing | ||||||||||||||
| 3 | 125 | 7 1/2" | 6" | 4 | 3/4" | No | Not Rated | 200 psi @ 140° F | 35° to 140° | 8" | 14" | 8" | 00000000 | 0000000 |
| 4 | 125 | 9" | 7 1/2" | 8 | 3/4" | No | Not Rated | 200 psi @ 140° F | 35° to 140° | 9" | 17" | 9" | 00000000 | 000000 |
| 6 | 125 | 11" | 9 1/2" | 8 | 7/8" | No | Not Rated | 200 psi @ 140° F | 35° to 140° | 10 1/2" | 22 5/16" | 10 1/2" | 00000000 | 00000000 |