Product Description
1. Top entry cast steel trunnion ball valve is a dedicated shut‑off valve for pipeline service. It adopts
integrally cast one piece body and top removable bonnet structure.
2. It is unnecessary to remove the whole valve from pipeline for maintenance. Only by disassembling the
top bonnet bolts can the ball, seats and sealing assemblies be serviced on‑line.
3. Both ends of valve body remain connected to pipeline. No pipeline cutting or valve removal from line is
required. It greatly reduces production loss of pipeline, shortens maintenance downtime and lowers
external leakage risk. It is the preferred valve for hard‑to‑access applications such as long‑distance
transmission pipelines and buried pipe networks.
4. The product meets demanding service requirements of oil and gas, petrochemical, power, LNG and coal
chemical industries. It complies with API 6D, ASME B16.34 and GB/T 19672. Custom configurations for
low temperature, high temperature, NACE sulphide resistance and low emission leakage are available.
Features & Benefits
1. Support on line inspection and maintenance
2. Ball upper and lower trunnion structure
3. BTL combined sealing seat structure design
4. Double Block and Bleed (DBB) function design
5. Automatic overpressure relief structure for valve cavity
6. Multiple combined stem sealing structure and anti blowout design to prevent stem ejection by medium pressure under misoperation.
7. Fire safe structure design
8. Anti static structure design
9. Drain and vent function structure design
10. Emergency sealant injection structure design
11. Position indicator and on‑off mechanical limit design
