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Automatic Drain Valves
Automatic drain valves remove sludge and liquid from compressed air systems. Automatic drain valves should be installed at each liquid collection point in a compressed air system, including:
Aftercooler/Separators
Air receivers
Coalescers (pre-filter)
Refrigerated dryer blow-down
Drip legs
Use our automatic drain valve cost saving calculator to see how much an automatic drain valve could save you a year.
Removing water and sludge with an automatic drain valve helps your compressed air system run more efficiently reducing your utility cost.
Robo Drain
The PPC Robo Drain is a state-of-the-art demand operated drain. Low pressure and high pressure Robo Drains are available. The unit is fully automated. Pneumatic power is used eliminating the need for electricity. The Robo Drain uses magnetic force to ensure a positive opening and closing action. The Robo Drain’s unique design places the magnetic force out of range of contaminant to stop metal particles from being attracted to the magnets. Additionally, its ball valve positioning and support prevents side-loading. To see how much you could save a year with an automatic drain valve use our Automatic drain valve cost saving calculator.
Features
Fully pneumatic
See-through vessel
Low profile
Ball valve stem support system
Non-clogging ball valve
No strainer required
Operates on demand
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Specifications
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Inlets
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(2) ¾’’ NPT and ½’’ NPT
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Outlets
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½’’ NPT
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Power
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Clean, dry compressed air 80 to 130 psi
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Operating Temperatures
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32°F to 180°F
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Weight
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16 lbs
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Discharge
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24 Ounces per cycle
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How the Robo Drain Drain Valve Works
- Condensation enters through one of two ports
- The see-through vessel allows visual inspection of the condensate as it fill the reservoir.
- A stainless steel float rises with the condensate and positions a magnetic force over the valve housing.
- When the liquid level reaches the desired level, the magnet in the valve housing snaps upward and opening the pilot compressed air valve.
- This compressed air is used to actuate the air cylinder causing it to extend and open the ball valve.
- Condensation, scale and rust particles rapidly exit the unit. Before any compressed air is lost, the float removes the magnetic force from the valve closing the pilot compressed air valve.
- A powerful spring returns the air cylinder to its normal position closing ball valve.
RoboDrain Connections Explained
The photo to the right shows a side view of a RD11-T RoboDrain. The blue cap is where the 1/8 in. needle valve needs to be installed.
The needle valve prevents a vacuum from forming in the RoboDrain. If a needle valve is not installed and adjusted a vacuum will form
causing condensate to back-up into the air system. The needle valve does bleed a small amount of compressed air to atmoshere. In a year
of operation the needle valve will consume about the same amount of compressed air as a standard electronic drain use in a single actuation.
The red cap is one of the 3/4 inch condensate inlets. Pipe your condensate to this port or the other 3/4 inch inlet (not pictured). One of the 3/4 inch inlets needs to be capped off or run the condensate to both inlets.
A needle valve and a cap for one of the 3/4 in. condensate inlets are not supplied. To properly install the RD11-T, please have these items on hand at installation. They are readily available from any plumbing supply house.
The photo to the right shows a close-up of the RoboDrain's control air connection. RoboDrain's operate on compressed air. The 1/4 inch behind the blue cap is where you connect your control air. The RoboDrain requires clean dry air with a pressure
between 80 and 120 PSI.
RoboDrain's come standard with an inlet air filter to stop particulate from clogging the drain's pneumatics. At the bottom center of the photo you can see the test button. The test button allows you to acctuate the RoboDrain at any time, testing the drain.
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Automatic Drain Valve Cost Saving Calculator
An automatic drain valve can save you thousands of dollars a year by reducing the amount of compressed air used to purge liquid condensate from your compressed air system.
The calculator figures how much it costs a year to have an open bleed valve. Choose the size bleed valve you have in your system and enter your utility cost per kW-Hr. The result is how much your bleed valve costs you a year and therefore how much you could save a year by installing an automatic drain valve(s).
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