Products
Liquid Drainers

Liquid Drainers

Liquid drainers are used to drain liquids found in compressed air lines and other systems containing pressurized gases. Liquid drainers are typically placed along the piping system transporting the compressed air or other gases or at the base of the receiver tank.

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.

Liquid Drainer Applications

Draining Liquid from Pipe Lines

Typically, most air line applications have a low level of condensate to discharge, and the piping does not become flooded with condensate. In this type of application a Float Type Liquid Drainer can be used without the need of a balancing line. Due to the low level of liquid being drained, an air space exists above the liquid in the pipe which balances the pressure allowing liquid to flow freely.

Separator on a Large Air Main

When large loads of condensate are required to be discharged, make sure a properly sized liquid drain trap is used. On large load applications, a balancing line is required, because non-condensable gases can be easily trapped in the drain trap due to fluctuating condensate levels.

Draining a Receiver Tank

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.

Drip Leg with a Guided Float Type Liquid Drainer

The Guided Float Type Liquid Drainers are available in either repairable or non-repairable configurations. All Stainless Steel body and internal components are suitable for corrosive applications. In low-flow drip applications, a balancing line is normally not required.

When are Balancing Lines Required ?

If a Float Type Liquid Drain Trap is selected, it may be required to add a balancing (or equalizing) to avoid traping air in the drainer. If the balancing line is not installed, air-binding can occur preventing the liquid from freely flowing to the drainer. When draining small volumes of liquids, and pipe diameters are sufficiently large to allow the back flow of air, balancing lines are not requried. Inverted Bucket Type and Disc Type Drain Traps will self-vent, eliminating the risk of air-binding and therefore do not require balancing lines.

The Guided Float Type Liquid Drainers are available in either repairable or non-repairable configurations. All Stainless Steel body and internal components are suitable for corrosive applications. In low-flow drip applications, a balancing line is normally not required.

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.

Float Type Liquid Drainers
Float Type Liquid Drainer traps use a float connected by a linkage to the
valve plug to discharge condensate from the system.
Guided Float Liquid Drainers

The WLD1800/WLD1800R liquid drainers are all stainless steel and are
piped vertically.

Other Drainer Types
Invert Bucket Drainers are used for the removal of water and oil from
compressed air systems. Disc Type Drainers can be used for outdoor
application subject to freezing.