About Gradual On/Off Valves
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Flanged Gradual On/Off Valves
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.
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.
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
- 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 | 00000000 |
| 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 |