1. Free from defects in material and workmanship.
2. Leakage-free operation within rated pressure and temperature limits.
3. Compliance with applicable manufacturing standards (API, ISO, or equivalent).
1. Damage due to misalignment during installation between flanges.
2. Corrosion/erosion due to aggressive media not specified in material compatibility.
3. Excessive torque applied during operation.
1. Safe for dead-end service within rated pressure.
2. Warranty against structural defects in the lug body and disc.
3. Coating/lining guaranteed against peeling under standard service conditions.
1. Use in high-vibration service without dampeners.
2. Thread damage from over-tightening bolts.
3. Warranty void if used for bi-directional dead-end service beyond rating.
1. Coverage for body integrity and sealing performance.
2. Suitable for heavy-duty service as per manufacturer’s pressure-temperature rating.
3. Protection against flange leakage if installed with correct gaskets.
1. Failures due to over-tightening flange bolts.
2. Damage from pipeline stresses (misalignment or unsupported loads).
3. Warranty void if subjected to abrasive slurry not designed for.
1. Coverage for zero-leakage metal-to-metal sealing under rated service.
2. Warranty on stem, bearings, and sealing surfaces against manufacturing defects.
3. Compliance with API 609 / ISO 10497 standards.
1. Seat wear from unfiltered abrasive media.
2. Use in services beyond specified temperature/pressure class.
3. Damage due to unauthorized modifications or welding on valve body.
1. Coverage for bidirectional sealing performance within rated conditions.
2. Fire-safe design warranty (if certified).
3. Protection against disc/stem blowout under normal operation.
1. Failures due to cavitation or flashing not accounted for in design.
2. Use in cryogenic service unless specified.
3. Incorrect actuator sizing leading to stem/seat damage.