1721 BARNES & JONES CAGE UNIT 🔥
Barnes & Jones Cage Unit for 1/2" Steam Traps
📘 Product Overview
The 1721 Barnes & Jones Cage Unit is designed for 1/2" steam traps, including models 122A and 122S. This cage unit replaces the existing thermostat and seat, providing a heavy-duty thermostatic element and seating system protected by a stainless steel cage.
Precisely calibrated, the cage ensures solid opening and closing of the trap. A high-tension spring applies pressure to the cover to prevent movement, while the thermostatic element responds to steam or condensate, controlling the plunger to maintain efficient drainage and prevent steam loss.
Compatible with standard Barnes & Jones steam traps, this cage unit ensures reliable operation, longer life, and reduced maintenance.
✅ Key Features
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Designed for 1/2" steam traps (122A & 122S)
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Heavy-duty thermostatic element and seat
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Protective stainless steel cage
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Precisely calibrated for solid opening and closing
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High-tension spring eliminates cover movement
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Expands with steam to close plunger; contracts with condensate to open plunger
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Operating pressure: Vac-25 PSIG
⚙️ Specifications
| Feature | Specification |
|---|
| Compatible Models |
Barnes & Jones 122A, 122S |
| Steam Trap Size |
1/2" |
| Operating Pressure |
Vacuum to 25 PSIG |
| Material |
Stainless steel cage, thermostatic element with ball plunger |
| Function |
Automatic condensate drainage |
| Mounting |
Fits standard trap orifice with cage protrusion |
| Protection |
Cage surrounds element for durability |
⚠️ Symptoms
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Steam escaping from the trap
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Condensate not draining properly
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Erratic trap operation
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Water hammer or pressure spikes in the system
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Steam trap failing to open or close reliably
❓ Frequently Asked Questions (FAQ)
Q: What is the purpose of the stainless steel cage?
A: The cage protects the thermostatic element and ensures durability while allowing precise operation.
Q: Can this cage unit be used on other steam trap sizes?
A: No, it is specifically designed for 1/2" Barnes & Jones 122A and 122S traps.
Q: What happens if the thermostatic element fails?
A: If the element fails, the plunger may not open or close properly, causing steam loss or condensate backup.
Q: How does the high-tension spring help the unit?
A: The spring applies pressure to the cover to prevent any unwanted movement, ensuring consistent operation.
🛒 Shopping Tips
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Verify your trap model (122A or 122S) before purchasing.
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Regularly inspect steam traps for wear to prevent inefficiencies.
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Replacement cage units extend the life of your steam traps and reduce maintenance downtime.
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Ensure the operating pressure does not exceed 25 PSIG for safe operation
