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About Gradual On/Off Valves
More
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.
- 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 |
Threaded Gradual On/Off Valves for Boiler Blow-Off
Prevent boiler scale deposits and sediment buildup with these valves that meet ANSI and ASME standards for boiler drainage applications. They gradually open and close to prevent system damage from suddenly starting or stopping flow.
Wheel handles open and close with multiple turns, providing more controlled, shock-resistant flow than lever handles. They have a nonrising stem that stays in the same position whether the valve is open or closed.
Lever handles open and close faster than wheel handles.
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
- Packing Material: EPDM Rubber
- Specifications Met: ANSI B16.31 Power Piping Codes, ANSI B31.1, ASME Boiler and Pressure Vessel Section 1 Codes
O'all | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
NPT Female | ||||||||
| 1 | 40 | 250 psi @ 350° F | 35° to 350° | 3 5/8" | 13" | 9" | 0000000 | 000000000 |
| 1 1/4 | 60 | 250 psi @ 350° F | 35° to 350° | 3 5/8" | 13" | 9" | 0000000 | 00000000 |
| 1 1/2 | 108 | 250 psi @ 350° F | 35° to 350° | 4 1/2" | 13" | 9 1/2" | 0000000 | 00000000 |
| 2 | 132 | 250 psi @ 350° F | 35° to 350° | 4 5/8" | 14" | 9 11/16" | 0000000 | 00000000 |
- Valve Type: Gate
- For Use With: Water
- Packing Material: EPDM Rubber
- Specifications Met: ANSI B16.31 Power Piping Codes, ANSI B31.1, ASME Boiler and Pressure Vessel Section 1 Codes
O'all | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Each | |
NPT Female | ||||||||
| 1 | 40 | 250 psi @ 350° F | 35° to 350° | 3 5/8" | 14 1/4" | 4 7/16" | 0000000 | 0000000 |
| 1 1/4 | 60 | 250 psi @ 350° F | 35° to 350° | 3 5/8" | 13 1/16" | 4 3/4" | 0000000 | 000000 |
| 1 1/2 | 108 | 250 psi @ 350° F | 35° to 350° | 4 1/2" | 20 3/8" | 5 13/16" | 0000000 | 000000 |
| 2 | 132 | 250 psi @ 350° F | 35° to 350° | 4 5/8" | 21 5/16" | 6 1/16" | 0000000 | 00000000 |