PVC Automatic Flow Rate Controller


            >  Accuracy: ± 2% Flow Setting
            >  Repeatability: ± 1% of Setpoint
            >  Response time: Instantaneous 
            >  Turndown ratio: 20 to 1 (average)
            >  Connections: 3/4" NPT
            >  Max. Working Press: 275 PSI Max. (150# ANSI)

Materials of Construction:

All wetted parts are PVC with the following exceptions:

Spring: PVC coated 316 stainless
Thrust washer: Teflon
O-Rings: PTFE, Viton or Buna

Typical Applications

Deionized Water-Rotating Seals-Additives/Blending-Nitrogen Blanketing-Natural Gas-Bleaching Systems-Reverse Osmosis-Dynamometers-Ratio Blending-Humidity Control-Polymer Injection-Heat Exchangers-Cooling Water-Dust Suppression-Aircraft Deicing-Test Cells-Caustics-Acids-Instrument Purge-Analytical Fast Loops...and hundreds more!

How It Works

The PVC flow rate controller works under the same basic principle as the stainless steel unit. PVC construction makes the unit ideal for use with corrosive mediums where stainless steel is incompatible. The Kates PVC Flow Rate Controller is available with flow ranges from .05 GPM to 25 GPM (.19 to 94.6 LPM).

The flow rate through an orifice is proportional to the size of the restriction and the differential pressure across it. By combining an adjustable orifice with an internal regulating valve, the Kates controller will maintain a constant pressure drop across the metering orifice.

P1=P2 + Spring Force
For example; if supply pressure (P1) increases, the resulting momentary pressure imbalance immediately moves the impeller downward. This action restricts the valve ports thus increasing orifice backpressure (P2), restoring differential pressure and the flow rate to the original settings. The unit will respond equally as well to an upset in outlet pressure (P3).


Did you know???

It is rather ordinary for us to come across a Kates controller in the field still functioning after 40, 50 or even 60 years.
Kates Diagram