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Humphrey | Diaphragm Poppet Air Piloted Valves | 250AA-3-10-20

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Pickup Available at Livermore

Items that don't require customization purchased before 12 PM will be available the same business day. Items that require customization or are purchased after 12 PM will be available the next business day.

250AA Series 1/4 pipe Air Pilot Valve features the classic Humphrey diaphragm-poppet principle, while incorporating an internal compensating orifice to achieve faster response times, or a "momentary signal, maintained position" function. The unbalanced, air-spring return design assures reliable shifting and bubble-tight sealing actuated, or unactuated. Compact design permits close proximity mounting to work. These rugged normally closed air valves are available in 2 or 3- way function.

Number of Ports 3 ports
Number of Positions 2 positions
Valve Function Single Pilot, Normally Closed
Piping Type Inline, Direct Piping
Size (in) HxWxD 1.97 x 1.63 DIA
Options Included Internal compensating orifice
Media Air
Type of Operation Air Piloted, w/Bleed
Flow Capacity (Cv) 0.83
Port Size 1/4 NPSF (Pilot Port: 1/8 NPSF)
Lubrication Not required
Media Filtration Not required
Pressure Range (psi) 15-125
At Valved Pressure of:
Recommended Pilot Pressure (psi):
<=30 PSI 60 PSI 90 PSI 120 PSI
22 39 58 72
Operating Speed (cycles/min) 600
Ambient Temperature Range (⁰F) -20~225
Wetted Materials Zinc diecast, Brass, SST, Buna N
Weight (oz) 8.0

ID #: 3802

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More about this product

Video Transcript

The three-way valve in pneumatics is one of the more common valves you're gonna find in pneumatic systems. And the average configuration, it consists of an in which is where the air goes in an out, which is where the air goes out to do whatever you're gonna do, and an exhaust. So a good. Useful thing that they would do would be a cylinder.

So you might turn on the valve actuator with a push button with a solenoid, which is electricity or whatever, and the cylinder goes up and it stays extended as long as the valve is on air is flowing. But when you turn the valve off air is still flowing to the valve, but it's no longer flowing out of the.

and what happens is that exhaust and the cylinder would slowly or quickly, depending on how you set it up, come back down. So you, you wanna be careful with that, especially if you're underneath the cylinder. The other major use for three-way valves is what we call piloting another larger valve. So in this case, think that you maybe have a big gargantuan six inch valve.

And it's driven by air pilot. And let's say it's flowing something that's flammable or something that's, uh, liquid. And so you need a much larger valve and you have this little air valve that uses the air on and off to turn the big valve on and off. So it's called piloting and it goes into an air pilot when error hits the air pilot.

It actuates the larger valve. When you take air off, you need it to exhaust so that it can change the state of the larger valve. And those are kind of the two major ways that a three-way valve was used. It's a very versatile valve. There are a number of other things that you would use that for in a pneumatic system, and we will go over that at a later time.

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