About Gradual On/Off Valves
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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 nonrising stem keep the handle in the same position whether they’re open or closed. They're often used underground and in low-clearance locations.
Ductile iron valves are stronger and more durable than cast iron valves. They’ll handle greater pressure changes without cracking.
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: Air, Water
- Specifications Met: AWWA C515, FM Approved, UL Listed
O'all | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | 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 | 7 1/2" | 6" | 4 | 3/4" | No | 108 | 300 psi @ 100° F | 35° to 170° | 8" | 23" | 7 7/8" | 6276N11 | 0000000 |
| 4 | 9" | 7 1/2" | 4 | 3/4" | No | 188 | 300 psi @ 100° F | 35° to 170° | 9" | 27 1/16" | 10" | 6276N12 | 000000 |
| 6 | 11" | 9 1/2" | 8 | 7/8" | No | 423 | 300 psi @ 100° F | 35° to 170° | 10 1/2" | 35 1/4" | 12" | 6276N13 | 000000 |
| 8 | 13 1/2" | 11 3/4" | 8 | 7/8" | No | 757 | 300 psi @ 100° F | 35° to 170° | 11 1/2" | 45 3/16" | 15 3/4" | 6276N14 | 00000000 |
Flexible Joint Gradual On/Off Valves
- Valve Type: Gate
- For Use With: See table
- Seal Material: EPDM Rubber
- Specifications Met: See table
Flexible joints keep these valves tightly sealed during pressure changes or vibrations from heavy machinery. Also known as gate valves, they gradually open and close to prevent system damage from sudden flow changes. They have a rubber-coated gate that compresses against the valve for a long-lasting, leakproof seal. They’ll seal tightly even when installed vertically, when there’s low back pressure, or when the liquid contains solids and debris. Made of ductile iron, these valves are stronger than cast iron valves and resist cracking from pressure changes. The body is coated with epoxy to protect against corrosion. They meet at least one American Water Works Association (AWWA) standard for reliable and safe performance in water supply systems.
These valves fit well in tight spaces since the stem doesn’t rise when they open. Their flanged stem housing bolts in place for easy disassembly for maintenance and repairs. Use a valve wrench to open and close these valves. Because they require a wrench, they can’t be opened accidentally when bumped or snagged.
FM-approved valves are used in fire suppression and protection systems. They help isolate parts of water supply systems in buildings and plants.
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.
O'all | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | Bolt Circle Dia. | No. of Bolt Holes | Bolt Hole Dia. | Bolts Included | Retaining Ring Included | Flow Coefficient (Cv) | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | For Use With | Specifications Met | Each | |
Wrench Operated and Nonrising Stem—Red Epoxy-Coated Ductile Iron Body and Rubber-Coated Ductile Iron Gate | ||||||||||||||||
Flanged Stem Housing | ||||||||||||||||
| 6 | 11 1/16" | 9 1/2" | 4 | 7/8" | No | Yes | 423 | 300 psi @ 100° F | 35° to 170° | 10 1/2" | 24 1/2" | 10 1/2" | Water | AWWA C515, FM Approved, UL Listed | 6385N11 | 0000000 |