Pneumatic gas flow timer

test

This companes make timers that go for long times but they are low flow. Could pilot a larger valve to get the flow you need.

http://www.kuhnkeusa.com/timersandcounters.php

Try a Google search for Pneumatic Flow Meters to see several companies that make them in different arrangements.

"It cannot have external power ..."

Can I ask why not?

A time cycle controller is recommended for any application where it is desired to automatically open and close valve in accordance with a predetermined time schedule. It is normally used as a time cycle controller on the gas injection line of an intermitting installation or as a controller on the tubing for "stop clockin" service. This is a non-electric pneumatic device. If this device is installed on a Flow Control Valve you can get the expected flow rate.

For more information log on to our website www.parveen.in or send us an e-mail at parveen@vsnl.com

One way to do it is to use a fully pneumatic cam timer with a 1 rev-per-hour gearbox.

Set the cam to trip at 45 mins (where due to lack of precision in the speed setting of the motor - or the cam angle - or the trip point on the pneumatic micro-switch) you won't know the exact time until you run it. (you have to fiddle with all three to get it exact (but once set up it is fairly spot-on)

The pneumatic output from the timer then operates the on/off valve controlling the flow to your device, and also to stop the timer itself before the next cycle (otherwise it runs continuously).

You can use the second cam switch (via additional valves) to make it automatic (or wind it on by hand with the friction knob).

I hope this helps.

I have checked rotolink and they have a unit that I think will work fine unfortunately I am in the US and they don't have any distribution. They are priced right but they have a long lead times, can't pay with AMEX, make everything to order with no path for expediting and frankly don't act like they care if you buy or not.

Like to find a competitor.

Hello Rick

Your experience is much like mine. I would love to find an alternative supplier but no such luck. But I keep looking. Lots of people seem to make pneumatic cam switches but they are all driven by electric motors. Rotolink seem to have a monopoly on miniature air motors.

I have retired now but an early experience comes to mind reminds me when their attiitude towards customers was awful. It does not seem to hgave changed.

I had to complain about late delivery and when I kept chasing them by telephone the girl told me that people like us were a just a nuisance by asking where our cam switched were simply because it caused linterruption to production that slowed things down even more thus making deliveries that much later.

If you ever find another supplier my ex company would love to know.