Product Description
1. Top entry orbit ball valve is a high performance positive shut off valve for pipeline service. It adopts integrally forged or cast one piece body and top removable bonnet structure. Relying on stem orbit cam mechanism, it realizes unique operation logic that the ball lifts off seat firstly, then rotates, and achieves mechanical wedging sealing upon valve closing.
2. It is not required to remove the whole valve from pipeline for maintenance. Only disassemble top bonnet bolts, then the ball, seats and complete sealing assemblies can be serviced on line, without disconnection of both pipeline ends.
3. Both ends of valve body keep connected with pipeline. No pipeline cutting or valve removal from line is needed. It greatly reduces pipeline production loss, shortens maintenance downtime and lowers external leakage risk. Zero friction and wear occur on sealing surfaces during full opening and closing cycle. It is suitable for harsh wear prone and hard to access service conditions such as medium containing impurities, high pressure differential, frequent operation and buried long distance transmission pipelines.
4. The product satisfies severe service requirements of oil and gas, LNG, coal chemical industry, hydrogenation unit, petrochemical, power and other industries. It complies with API 6D, ASME B16.34 and GB/T 19672. Custom options including low temperature, high temperature, NACE sulphide resistance, low fugitive emission and hard alloy overlay welding for wear resistance are available.
Features & Benefits
1. Top entry integral body, support on line inspection and maintenance without pipeline disassembly
2. Orbit cam positive sealing structure. The ball lifts off seat prior to rotation during operation, zero friction on sealing surfaces for extended service life
3. 360 degree self flushing flow path design for sealing surface. Medium automatically flushes away impurities to prevent jamming and scratching of sealing pair by particles
4. Single seat bidirectional zero leakage sealing structure, eliminating safety hazard caused by cavity pressure rise
5. Low torque operation design, easy opening and closing for large size and high pressure working conditions
6. Automatic overpressure relief structure for valve cavity
7. Multi loaded combined stem seal plus anti blowout structure, preventing stem ejection by medium pressure under misoperation, low fugitive emission
8. Fire safe structure design, compliant with API 6FA / API 607 fire safety certification
9. Anti static structure design, suitable for pipelines carrying flammable and explosive media
10. Integrated functional ports for drain and vent
11. Emergency sealant injection structure design for on line emergency leakage remediation
12. Visual position indicator plus on off mechanical limit lock to prevent misoperation
