Description
UV SYSTEMS & THEIR TYPICAL O-RING / SLEEVE SIZES
(South African common stock, SDE-series + standard domestic UV)
⭐ SMALL DOMESTIC UV – 10W to 21W
| Model | Flow Rate | Quartz Sleeve Ø | O-Ring Size |
|---|---|---|---|
| 10W (226 LPH) | 0.23 m³/hr | 22–23 mm | Small O-ring |
| 14W (453 LPH) | 0.45 m³/hr | 22–23 mm | Small O-ring |
| 15W SDE-015 (680 LPH) | 0.68 m³/hr | 22–23 mm | Small O-ring |
| 21W SDE-021 (1360 LPH) | 1.3 m³/hr | 23–28 mm | Medium O-ring |
⭐ MEDIUM UV – 29W to 65W
| Model | Flow Rate | Quartz Sleeve Ø | O-Ring Size |
|---|---|---|---|
| 29W SDE-029 (1814 LPH) | 1.8 m³/hr | 28 mm | Medium O-ring |
| 40W SDE-040 (2721 LPH) | 2.7 m³/hr | 28–30 mm | Medium-large |
| 65W SDE-065 (3024 LPH) | 3.0 m³/hr | 30–32 mm | Large O-ring |
⭐ LARGE COMMERCIAL UV – 85W to 120W
These units normally use a big thick rubber O-ring for a 35 mm sleeve.
| Model | Flow Rate | Quartz Sleeve Ø | O-Ring Size |
|---|---|---|---|
| 85W (5443 LPH) | 5.4 m³/hr | 30–35 mm | Large O-ring |
| 105W (7938 LPH) | 7.9 m³/hr | 30–35 mm | Large O-ring |
| 120W (10,200 LPH) | 10.2 m³/hr | 35 mm | Extra-large |
⭐ INDUSTRIAL UV – 2×155W / 3×155W / 4×155W
These big UV chambers use flanged ends and a thick industrial O-ring, not the small domestic type.
| Model | Flow Rate | Total Watt | Sleeve Type | O-Ring |
|---|---|---|---|---|
| (2)×155W – 20 m³/hr (310W) | 20,000 LPH | 310W | Large 4″ flange | Industrial flange O-ring |
| (3)×155W – 30 m³/hr (465W) | 30,000 LPH | 465W | Large 2″ / 4″ flange (depends on manufacturer) | Industrial flange O-ring |
| (4)×155W – 50 m³/hr (620W) | 50,000 LPH | 620W | Large 4″ flange | Industrial flange O-ring |
➡️ These units DO NOT use the small round domestic O-rings.
They use big flat industrial O-rings designed for high-pressure stainless chambers.
🔥 QUICK SUMMARY — O-RING GROUPS
Group 1 — Small Domestic O-ring
-
10W, 14W, 15W, 21W
-
Sleeve: 22–23 mm
-
O-ring: SMALL
Group 2 — Medium Domestic O-ring
-
29W, 40W
-
Sleeve: 28–30 mm
-
O-ring: MEDIUM
Group 3 — Large Domestic O-ring
-
65W, 85W, 105W, 120W
-
Sleeve: 30–35 mm
-
O-ring: LARGE
Group 4 — Industrial O-ring
-
All 155W multi-lamp systems
-
Sleeve: Big flanged system (4″ or 2″)
-
O-ring: INDUSTRIAL FLANGE RING
UV Unit Maintenance Tips: O-Rings, Leaks, and Pressure Management
Proper maintenance of your UV water sterilizer not only extends its lifespan but also ensures safe, leak-free operation. Below are key tips regarding O-rings, seal lubrication, and pressure management:
🟢 O-Ring & Seal Maintenance
-
Replace the O-ring each time you open the UV unit, especially during lamp or quartz sleeve replacement.
-
Although standard O-rings can last for years under normal conditions, they may become brittle over time.
-
Old or dry O-rings are prone to cracking or leaking, especially when reassembled.
⚠️ Avoid Over-Tightening
-
Over-tightening fittings can:
-
Deform or flatten the O-ring
-
Cause buckling at the seal point
-
Result in leaks even when everything appears tight
-
-
Tightening onto a dry seal increases friction and may cause:
-
Stretching, pinching, or tearing of the rubber
-
🧴 Lubrication Tip: Use Crisco, Not Vaseline
-
Apply a light layer of Crisco (vegetable grease) to lubricate the O-ring:
-
Prevents pinching or stretching during assembly
-
Ensures a smooth, uniform seal
-
Safe for aquatic environments (non-toxic to fish and pond life)
-
Does not degrade rubber like Vaseline or petroleum-based lubricants can
-
Reviews
There are no reviews yet.