The “Barnes & Jones/Edison Element”, called a Cage Unit, is a self-contained thermostatic repair unit that is designed to repair thermostatic steam traps without taking the trap body off line. Cage Units are 100% factory calibrated and tested, under live steam and condensate, to insure uniform operation in the field. The one-piece, self contained design allows for the ease of on-line repair. There are no piping connections that need to be broken or multiple internal components to be removed. The body of the trap acts merely as a housing for the Cage Unit which performs the actual steam trap functions.
Cage Units have actuators that are balanced pressure devices that use vapor pressure within a diaphragm to open and close a valve in a modulating manner dependent upon the temperature surrounding it. The Cage Unit is normally open to expel air and condensate. As saturated steam surrounds the unit, the volatile fill inside the element quickly flashes into a vapor, creating an internal pressure that is equal to the surrounding steam pressure. This equalization of pressures allow the bellows to expand to its natural length or “closed position”, preventing any steam from passing its point of use. The presence of condensate will cool the bellows and condense the vapor within, reinstating the vacuum, causing the bellows to retract to its open position, thus allowing the condensate to drain from the steam trap.
One-piece thermostatic repair kit to repair most makes of thermostatic steam traps
Calibrated and tested under live steam and condensate to insure precise operation
All Stainless Steel Valve, Seat, and Body
Phosphor-Bronze & Monel actuating element
Repairs virtually all models of thermostatic steam trap manufactured by : Hoffman, Barnes & Jones, Trane, Sarco, Warren Webster, Sterling, Dunham-Bush, and many more
5 Easy Steps to Repairing a Steam Trap using the Edison Cage Unit:
Step 1: Determine the make and model of the existing steam trap to be repaired. Step 2: Select the proper Edison Kit and colour coded spring. Step 3: Remove the existing trap cover and all internal components. Step 4: Drop in the Edison Cage Unit. Step 5: Reinstall the existing trap cover (or New Cover if required as shown in the ‘Edison Element Tables’ in the ‘Cover’ column).
Click either of the pictures below to view Edison elements organized by either manufacturer or kit number.
Tip: You can download the PDF onto your computer by right-clicking the picture and choosing 'save link as.'
5 Easy Steps to Repairing a Steam Trap using the Barnes & Jones Cage Units:
Step 1: Determine the make and model of the existing steam trap to be repaired. Step 2: Select the correct Barnes & Jones Cage Unit from the table. Step 3: Remove the existing trap cover and all internal components. Step 4: Drop in the Barnes & Jones Cage Unit. Step 5: Reinstall the existing trap cover (or New Cover if required as shown in the ‘Cage Unit Selection Guide’ in the ‘Cover’ column)
Click the picture below to view the Barnes & Jones Cage Unit selection guide.