About Precision Flow-Adjustment Valves
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Threaded Precision Flow-Adjustment Valves
Also known as needle valves, these adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Turn the handle to adjust flow. All valves have metal-to-metal seats that resist temperature fluctuations.
303 stainless steel valves are more corrosion resistant than brass and steel valves.
316 stainless steel valves have the best corrosion resistance.
Locking handles have a nut to prevent accidental flow adjustment.
Internal check valves actuate when the pressure changes to stop flow from the controlled direction and allow free flow in the opposite direction. Valves with an internal check valve are often used to control the speed of air cylinders and air-powered motors.
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: Needle
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: Fluoroelastomer Rubber/PTFE Plastic
Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body with Locking Knob Handle | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 0.2 | 2000 psi @ 400° F | -15° to 400° | 1 1/2" | 0000000 | 000000 |
| 1/4 | 0.43 | 2000 psi @ 400° F | -15° to 400° | 2" | 0000000 | 00000 |
| 3/8 | 0.78 | 2000 psi @ 400° F | -15° to 400° | 2 1/4" | 0000000 | 00000 |
| 1/2 | 1.24 | 2000 psi @ 400° F | -15° to 400° | 2 11/16" | 0000000 | 000000 |
| 3/4 | 1.93 | 2000 psi @ 400° F | -15° to 400° | 2 15/16" | 0000000 | 000000 |
Brass Body with Locking Knob Handle and Internal Check Valve | ||||||
| 1/8 | 0.23 | 2000 psi @ 400° F | -15° to 400° | 1 3/4" | 0000000 | 00000 |
| 1/4 | 0.54 | 2000 psi @ 400° F | -15° to 400° | 2 3/8" | 0000000 | 00000 |
| 3/8 | 0.83 | 2000 psi @ 400° F | -15° to 400° | 2 3/4" | 0000000 | 00000 |
| 1/2 | 1.47 | 2000 psi @ 400° F | -15° to 400° | 3 3/16" | 0000000 | 00000 |
| 3/4 | 1.9 | 2000 psi @ 400° F | -15° to 400° | 3 9/16" | 0000000 | 000000 |
Steel Body with Locking Knob Handle | ||||||
| 1/8 | 0.2 | 5000 psi @ 400° F | -15° to 400° | 1 1/2" | 0000000 | 00000 |
| 1/4 | 0.43 | 5000 psi @ 400° F | -15° to 400° | 2" | 0000000 | 00000 |
| 3/8 | 0.78 | 5000 psi @ 400° F | -15° to 400° | 2 1/4" | 0000000 | 00000 |
| 1/2 | 1.24 | 5000 psi @ 400° F | -15° to 400° | 2 11/16" | 0000000 | 00000 |
Steel Body with Locking Knob Handle and Internal Check Valve | ||||||
| 1/8 | 0.23 | 5000 psi @ 400° F | -15° to 400° | 1 3/4" | 0000000 | 00000 |
| 1/4 | 0.54 | 5000 psi @ 400° F | -15° to 400° | 2 3/8" | 0000000 | 00000 |
| 3/8 | 0.83 | 5000 psi @ 400° F | -15° to 400° | 2 3/4" | 0000000 | 00000 |
| 1/2 | 1.47 | 5000 psi @ 400° F | -15° to 400° | 3 3/16" | 0000000 | 00000 |
| 3/4 | 1.9 | 5000 psi @ 400° F | -15° to 400° | 3 9/16" | 0000000 | 000000 |
303 Stainless Steel Body with Locking Knob Handle | ||||||
| 1/8 | 0.2 | 5000 psi @ 400° F | -15° to 400° | 1 1/2" | 0000000 | 000000 |
| 1/4 | 0.43 | 5000 psi @ 400° F | -15° to 400° | 2" | 0000000 | 000000 |
| 3/8 | 0.78 | 5000 psi @ 400° F | -15° to 400° | 2 1/4" | 0000000 | 000000 |
| 1/2 | 1.24 | 5000 psi @ 400° F | -15° to 400° | 2 11/16" | 0000000 | 000000 |
303 Stainless Steel Body with Locking Knob Handle and Internal Check Valve | ||||||
| 1/8 | 0.23 | 5000 psi @ 400° F | -15° to 400° | 1 3/4" | 0000000 | 000000 |
| 1/4 | 0.54 | 5000 psi @ 400° F | -15° to 400° | 2 3/8" | 0000000 | 000000 |
| 3/8 | 0.83 | 5000 psi @ 400° F | -15° to 400° | 2 3/4" | 0000000 | 000000 |
316 Stainless Steel Body with Locking T-Handle and Internal Check Valve | ||||||
| 1/2 | 1.47 | 5000 psi @ 400° F | -15° to 400° | 3 3/16" | 0000000 | 000000 |
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: Fluoroelastomer Rubber/PTFE Plastic
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body with Locking Knob Handle | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 0.2 | 2000 psi @ 400° F | -15° to 400° | 1 1/2" | 0000000 | 000000 |
| 1/4 | 0.43 | 2000 psi @ 400° F | -15° to 400° | 2" | 0000000 | 00000 |
| 3/8 | 0.78 | 2000 psi @ 400° F | -15° to 400° | 2 1/4" | 0000000 | 00000 |
Brass Body with Locking Knob Handle and Internal Check Valve | ||||||
| 1/4 | 0.54 | 2000 psi @ 400° F | -15° to 400° | 2 3/8" | 0000000 | 00000 |
| 3/8 | 0.83 | 2000 psi @ 400° F | -15° to 400° | 2 3/4" | 0000000 | 00000 |
Easy-Set Threaded Plastic Precision Threaded Flow-Adjustment Valves
- Valve Type: Needle
- For Use With: Air, Oxygen
- Seal Material: Buna-N Rubber
To ensure consistent and repeatable settings, these valves have color-coded handle threads and numerical markings. One full revolution of the handle reveals a new color to indicate the set point. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. The locking knob handle has a ring that prevents accidental adjustment.
Internal check valves actuate when the pressure changes to stop flow control from the controlled direction and allow free flow in the opposite direction. Valves with an internal check valve are often used to control the speed of air cylinders and air-powered motors.
Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.
For technical drawings and 3-D models, click on a part number.
Valves | Mounting Nuts | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | For Use With | Each | Each | ||
Black Glass-Reinforced Polyester Plastic Body | ||||||||||
NPTF Female × NPTF Female | ||||||||||
| 1/8 | 0.26 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 0000000 | 000000 | 0000000 | 00000 |
| 1/4 | 0.48 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 3/8 | 1.06 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 1/2 | 1.35 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 3/4 | 1.96 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 3" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
Black Glass-Reinforced Polyester Plastic Body with Internal Check Valve | ||||||||||
NPTF Female × NPTF Female | ||||||||||
| 1/8 | 0.26 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 00000000 | 00000 | 0000000 | 0000 |
| 1/4 | 0.48 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 00000000 | 00000 | 0000000 | 0000 |
| 3/8 | 1.06 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 00000000 | 00000 | 0000000 | 0000 |
| 1/2 | 1.35 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 00000000 | 00000 | 0000000 | 0000 |
| 3/4 | 1.96 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 3" | Air, Oxygen | 00000000 | 000000 | 0000000 | 0000 |