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Humphrey | Diaphragm Poppet Air Piloted Valves | 125A-2-11-21

14 in stock | Need More? >>

Ships same day if ordered M-F before 3PM PT.

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.
Quantity Discount Part Price
>10 5.0 % $55.44

125A Series 1/8 pipe Air Pilot Valves feature the classic Humphrey diaphragm poppet principle. The unbalanced, air-spring return design assures reliable shifting and bubble-tight sealing actuated, and unactuated. Compact design permits close proximity mounting to work and fast cycling/quick exhaust. Rugged 2- or 3- way valves are available normally closed or normally open, in standard or optional brass body construction (for alternate media).

Number of Ports 2 ports
Number of Positions 2 positions
Valve Function Single Pilot, Normally Open
Piping Type Inline, Direct Piping
Size (in) HxWxD 2 x 1.19 DIA
Options Included Mounting base
Media Air, Inert Gas
Type of Operation Air Piloted
Flow Capacity (Cv) 0.30
Port Size 1/8 NPSF
Lubrication Not required
Pressure Range (psi) 0-125
At Valved Pressure of:
Recommended Pilot Pressure (psi):
<=30 PSI 60 PSI 90 PSI 120 PSI
30 43 67 88
Operating Speed (cycles/min) 600
Ambient Temperature Range (⁰F) 0-225
Wetted Materials Zinc plated steel, Brass, Buna N
Weight (oz) 5.5

ID #: 31358

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Video Transcript

A two-way valve is the simplest of all valves. You can have a two-way valve in pretty much any pneumatic system. They're the most simple. In our example, we're going to simply take a two-way push button valve. Two-way just means there is only two things that can be happening. It's either on or it's off.


And the push button, well, that's just the way we're going to make that happen. We could have a, a lever, we could have electricity, we could have any sorts of ways to make it happen. But all we're doing with the push button is simply actuating, making the valve change from one state to the other, and it's a two-way valve.


So the only two states, state number one is off, means the air is going to the valve, but it's not going through the valve.  state two as I come along and I push the button, sit on the button, kick the button, whatever, and now the air is going through the valve and downstream to wherever we've got our tubing going to.


It could be going to a balloon, it could be going to all sorts of other things, but that's all the two-way valve is. It's either on or it is off.

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