OR29 O-Ring for Amerex and Badger (Pack of 100)
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Wholesale PricingThe OR29 Valve Body O-Ring (Pack of 100) is a high-precision elastomeric seal engineered for the primary pressure boundary of Amerex and Badger fire extinguishers. Specifically designed for 10 lb and 20 lb dry chemical units, the OR29 serves as the collar seal between the valve assembly and the cylinder neck. In a stored-pressure extinguisher, this O-ring is responsible for containing up to 195 PSI of nitrogen propellant for years at a time. A failure at this junction results in a leaker, a unit that loses pressure and becomes a non-functional liability.
Manufactured from high-grade Buna-N (Nitrile) rubber, the OR29 features a 70-durometer hardness, providing the perfect balance of flexibility for sealing and rigidity to prevent extrusion under pressure. This 100-pack bulk set is the logistical standard for service companies and maintenance departments. By standardizing with the OR29, technicians ensure that every 10 lb Amerex (ref: 5240) or Badger (ref: 1091) unit they service meets the rigorous leak-testing requirements of UL 299 and NFPA 10.
| Feature | Details |
|---|---|
| Part Number | OR29 (Amerex 5240 / Badger 1091) |
| Material | Buna-N (Nitrile) 70 Durometer |
| Quantity | 100 O-Rings per Bag |
| Inner Diameter (ID) | 1.046" |
| Cross Section | 0.139" |
| Compatible Brands | Amerex, Badger, Kidde |
| Temperature Range | -40°F to 212°F |
The OR29 must be replaced during every 6-year internal examination in accordance with NFPA 10 requirements. Even if the O-ring appears visually intact, six years of constant pressure causes compression set in Nitrile rubber, meaning the material loses its ability to spring back and maintain a full hermetic seal.
Before installation, apply a light film of silicone-based lubricant to the OR29. This allows the O-ring to slide smoothly into the seating groove without twisting or pinching as the valve body is threaded, ensuring a perfect 360-degree seal. Never use petroleum-based lubricants, which can degrade Nitrile rubber and cause premature seal failure. Following installation, a calibrated leak test must be performed to verify zero pressure loss before the unit is returned to service.
Why must the OR29 be replaced during every 6-year internal examination?
Over six years of constant pressure, Nitrile rubber undergoes compression set, where it loses its ability to spring back and maintain a seal. Even if the O-ring looks intact, the flattened profile significantly increases the risk of a slow pneumatic leak. NFPA 10 mandates replacement to ensure pressure integrity for the next service cycle.
Is lubrication necessary for the OR29 during installation?
Yes. Technicians should apply a light film of silicone-based lubricant to the OR29. This allows the O-ring to slide smoothly into the seating groove without twisting or pinching as the valve body is threaded, ensuring a perfect 360-degree hermetic seal.
Can the OR29 be used for CO2 extinguishers?
No. CO2 extinguishers operate at significantly higher pressures (850 PSI and above) and require specialized materials to prevent explosive decompression. The OR29 is strictly rated for stored-pressure units where pressures typically stay below 235 PSI.
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