Products
Float Type Liquid Drainers

Float Type Liquid Drainers

Typically used in process applications for draining condensate from air for other gases. If a Float Type Liquid Drainer is selected, typically it is necessary to add a Balancing (or Equalizing) Line to allow any air or gases trapped in the drainer to escape. If the Balancing Line is not installed, these gases can prevent proper operation by air-binding the trap.

Model Characteristics Material PMO (psig) Sizes Application
WLD1900 Float Type with Parallel Pipe Connection. Cast Iron  250  3/4"-2"

General Purpose Float Type Liquid Drainer with Cast or Ductile Iron Body
Low to moderately high volumes of liquid drainage.

WLD1400 Float Type with In-Line Pipe Connection. Ductile Iron  300

1/2"-2"

WLD600
WLD601

Float Type with In-Line Pipe Connection.

WLD600:
Cast Steel

WLD601:
Stainless Steel

 450 3/4"-4"

Cast Steel or Stainless Steel Body.

WLD1800
WLD1800R
Guided Float Type with Vertical Pipe Connection. Stainless Steel  400 1/2"-3/4"

Corrosive applications.
Pressures up to 450 PSIG. Repairable and Non- Repairable version available.

WLD1500 Inverted Bucket Style Cast Iron  200 3/4"-1" Low to medium capacity.
WLD1703S  Disc Type Stainless Steel  250 1/2" Very Compact size.
How Float Type Liquid Drainers Work

Liquid drainers contain a float-operated valve. When liquid enters the drainer, the float rises opening the valve which allows liquid to be drained. If a Float Type Liquid Drain Trap is selected, it may be required to add a balancing (or equalizing) line to allow any air or gases trapped in the drainer to escape. If the balancing line is not installed, these gases can prevent proper operation by air-binding the trap.
Without a Balancing Line

In applications where the volume of liquid being drained is large enough to fill the complete diameter of the pipe, the potential for air binding exists. This is occurs because Float type drain traps are normally closed, with the weight of the float keeping the valve in the closed position. Liquid must first enter the body of the trap to lift the float and open the valve. When the liquid tries to flow down the pipe, the air pressure inside the trap will continue to build and stop the flow of liquid causing the trap to air bind. A balancing line will equalize the pressure allowing the liquid to freely enter the trap and lift the float, allowing proper discharge to take place.

With a Balancing Line

If a Float Type Liquid Drainer is used on a receiver or tank, a balancing line is normally required. The balancing line must be installed above the highest liquid level point to ensure that condensate does not block the balancing line.

WLD1900-Series Liquid Drainers have Cast Iron Bodies ••• Parallel Pipe Connection ••• 250 psig Operating Pressures ••• All Stainless Steel Internals. Used for draining liquids from Tanks, Vessels, and piping systems containing pressurized Air or other gases.

WLD1400-Series have Ductile Iron Bodies ••• In-Line Pipe Connections ••• 300 psig Operating Pressures ••• All Stainless Steel Internals. Used for draining liquids from Tanks, Vessels, and piping systems containing pressurized Air or other gases.

WLD600-Series have Cast Steel Bodies. The WLD601-Series have Stainless Steel Bodies. Used for draining liquids from Tanks, Vessels, and piping systems containing pressurized Air or other gases.