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About Gradual On/Off Valves
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About On/Off Valves
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Threaded Gradual On/Off Valves
Also known as gate valves, these valves gradually open and close to prevent system damage from suddenly starting and stopping flow.
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 stem in the same position whether they’re open or closed. They’re often used underground and in low-clearance locations.
316 stainless steel valves resist corrosion better than bronze, brass, and cast iron 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.
For technical drawings and 3-D models, click on a part number.
- Valve Type: Gate
- For Use With: See Table
- Specifications Met: See Table
O'all | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | Stem Housing Connection Style | End-to-End Lg. | Ht. | Lg. | For Use With | Specifications Met | Each | |
NPT Female | ||||||||||||
| 1/2 | 17.6 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 2 1/8" | 4 1/2" | 2 3/4" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 000000 |
| 3/4 | 32 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 2 5/16" | 4 7/8" | 2 3/4" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 00000 |
| 1 | 54 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 2 11/16" | 5 3/8" | 3 1/8" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 000000 |
| 1 1/4 | 97 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 2 15/16" | 6 5/16" | 3 1/8" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 000000 |
| 1 1/2 | 135 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 3 1/8" | 7 1/2" | 3 15/16" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 000000 |
| 2 | 230 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | Threaded | 3 11/16" | 8 3/8" | 3 15/16" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam | ASTM A351 | 0000000 | 000000 |
| 3 | 802 | 200 psi @ 72° F | __ | -35° to 375° | Threaded | 5 1/8" | 11 3/16" | 5 1/8" | Water, Oil, Air, Helium, Krypton, Neon, Xenon, Carbon Dioxide, Nitrogen | __ | 00000000 | 000000 |
High-Pressure Threaded Gradual On/Off Valves
Designed for use in refineries and other demanding environments, these valves have a durable body that can withstand nearly twice the pressure of other gradual on/off valves. Also known as gate valves, they gradually open and close with multiple turns of the wheel handle to prevent system damage from suddenly starting and stopping flow.
These valves have a rising stem that lifts the handle as the valve opens and lowers as the valve closes. At a glance, you can see if flow is open or closed. The stem is isolated from what's flowing through your line, giving these valves a longer lifespan than valves with a nonrising stem. Their flanged stem housing, also known as a bolted bonnet, bolts in place to make them easy to take apart for maintenance and repairs. However, the flanged stem housing makes these valves heavier and larger than valves with threaded or welded stem housings.
Standard-port valves slightly restrict flow.
316 stainless steel valves have excellent corrosion resistance.
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, Air, Steam
- Packing Material: Graphite
- Specifications Met: American Petroleum Institute Standard 602, ASTM A182
O'all | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Stem Type | Each | |
NPT Female | ||||||||||
Standard Port | ||||||||||
| 1/2 | 7 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 3 1/8" | 6 3/4" | 3 1/8" | Rising | 00000000 | 0000000 |
| 3/4 | 14 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 3 9/16" | 6 7/8" | 3 9/16" | Rising | 00000000 | 000000 |
| 1 | 30 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 4 3/8" | 7 7/8" | 4 3/8" | Rising | 00000000 | 000000 |
| 1 1/4 | 85 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 4 11/16" | 10" | 4 11/16" | Rising | 00000000 | 000000 |
| 1 1/2 | 100 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 4 11/16" | 10 1/2" | 4 11/16" | Rising | 00000000 | 000000 |
| 2 | 160 | 1600 psi @ 100° F | 900 psi @ 800° F | -20° to 800° | 5 1/2" | 12 3/8" | 5 1/2" | Rising | 00000000 | 000000 |
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 |
Socket-Connect Gradual On/Off Valves
- Valve Type: Gate
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon, Steam
- Packing Material: PTFE Plastic
- Specifications Met: ASTM A351
Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection. Also known as gate valves, these valves gradually open and close with multiple turns of the wheel handle to prevent system damage from suddenly starting and stopping flow. Valves have a nonrising stem that stays in the same position whether the valve is open or closed. Body is 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
O'all | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Max. Steam Pressure | Temp. Range, °F | End-to-End Lg. | Ht. | Lg. | Stem Type | Each | |
Socket Connect Female | |||||||||
316 Stainless Steel Body and Gate | |||||||||
| 1/2 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 2 1/8" | 4 1/8" | 2 3/4" | Nonrising | 0000000 | 0000000 |
| 3/4 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 2 5/16" | 4 5/8" | 2 3/4" | Nonrising | 0000000 | 000000 |
| 1 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 2 11/16" | 5 3/8" | 3 1/8" | Nonrising | 0000000 | 000000 |
| 1 1/4 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 2 15/16" | 7 3/16" | 3 1/8" | Nonrising | 0000000 | 000000 |
| 1 1/2 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 3 1/8" | 7 7/16" | 3 15/16" | Nonrising | 0000000 | 000000 |
| 2 | 200 psi @ 350° F | 120 psi @ 350° F | 0° to 350° | 3 11/16" | 8 1/4" | 3 15/16" | Nonrising | 0000000 | 000000 |
Gradual On/Off Valves with Quick-Clamp Fittings for High Vacuum
Also known as vacuum isolation valves, these block flow so you can install and remove gauges from your system. They can also be used to add or vent gases in high-vacuum systems. Valves gradually open and close with multiple turns of the wheel handle to prevent system damage from suddenly starting and stopping flow. They connect to another quick-clamp fitting with a clamp and a ring (sold separately). All have a nonrising stem that stays in the same position whether the valve is open or closed. Body is 304 stainless steel for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- Valve Type: Gate
- For Use With: Air
- For Tube Material: 304/304L Stainless Steel, 316/316L Stainless Steel
- Seal Material: Viton® Fluoroelastomer Rubber
- Specifications Met: ISO 2861
O'all | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Flange OD | Max. Vacuum | Temp. Range, °F | Ht. | Lg. | High-Vacuum Flange Size | Sterilize With | Stem Type | Each | |
Quick Clamp | ||||||||||
304 Stainless Steel Body—316 Stainless Steel Gate | ||||||||||
| 1/2" | 1 3/16" | 10 -7 torr @ 72° F | 0° to 190° | 4 1/8" | 2 1/4" | 10 | Steam (Autoclaving) | Nonrising | 00000000 | 0000000 |
| 3/4" | 1 3/16" | 10 -7 torr @ 72° F | 0° to 190° | 4 1/8" | 2 1/4" | 16 | Steam (Autoclaving) | Nonrising | 00000000 | 000000 |
| 1" | 1 9/16" | 10 -7 torr @ 72° F | 0° to 190° | 5 5/8" | 3" | 25 | Steam (Autoclaving) | Nonrising | 00000000 | 000000 |
| 1 1/2" | 2 1/8" | 10 -7 torr @ 72° F | 0° to 190° | 6 3/8" | 3 7/8" | 40 | Steam (Autoclaving) | Nonrising | 00000000 | 000000 |
| 2" | 2 15/16" | 10 -7 torr @ 72° F | 0° to 190° | 8" | 4 1/2" | 50 | Steam (Autoclaving) | Nonrising | 00000000 | 000000 |
- For Use With: Air
- O-Ring Material: Fluoroelastomer Rubber
- For Tube Material: 304/304L Stainless Steel, 316/316L Stainless Steel
- Inner Ring Material: 304 Stainless Steel
- Specifications Met: ISO 2861
Use these rings with quick-clamp high-vacuum fittings. They consist of a stainless steel inner ring covered by a fluoroelastomer O-ring.
Rings with screen have a stainless steel screen to filter out large particles.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | Max. Vacuum | Temp. Range, °F | Lg. | Max. Pressure | Each | |
Rings | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/2" | 1.18" | 10 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
| 3/4" | 1.18" | 16 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 0000 |
| 1" | 1.57" | 25 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 0000000 | 00000 |
| 2" | 2.95" | 50 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 0000000 | 00000 |
Rings with Stainless Steel Screen | ||||||||
| 3/4" | 1.18" | 16 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
Rings with Aluminum Outer Ring | ||||||||
| 3/4" | 1.18" | 16 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | 100 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | 75 psi @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | 10 -7 torr @ 72° F | 0° to 300° | 5/16" | 50 psi @ 72° F | 0000000 | 00000 |