High Temperature Stainless Steel Ball Valve With Cooling Extended Stem
High temp stainless steel ball valve adopts cooling stem design to block heat transfer, graphite seal anti aging, used for asphalt, steam & thermal oil pipelines.
Description
High-temperature stainless steel ball valves are purpose‑built for service media such as superheated steam, hot asphalt, and thermal oil. Their two defining features—a heat‑resistant sealing system paired with an extended cooling stem—effectively overcome the common drawbacks of ordinary ball valves, namely excessive heat conduction to the handle and premature packing degradation that causes leakage. These valves reliably sustain repeated on‑off cycling at temperatures up to 420°C, and find wide application in high‑temperature piping networks within refineries, thermal power stations, and biomass boiler plants.
The body is investment‑cast from 304 or 316L heat‑resistant stainless steel, which resists oxidation and distortion at elevated temperatures. Unlike standard ball valves that rely on PTFE seals, this model employs flexible graphite packing and a metal‑to‑metal hard‑seat configuration. Even under prolonged exposure to 380°C asphalt transfer, the sealing elements do not carbonise or fail. The 316L high temperature stainless steel ball valve offers enhanced resistance to sulphide corrosion, making it better suited for refinery lines carrying corrosive hot fluids.
An extended cooling stem increases the thermal conduction path, creating a buffer zone that prevents heat from travelling upward to the handle or to any mounted pneumatic/electric actuators. This design not only avoids operator burn hazards but also shields the upper packing from ageing due to persistent heat. The flanged version complies with Class300 pressure ratings and is compatible with mainstream industrial hot‑service main pipelines; with the addition of automated actuation, remote control becomes straightforward.
Key Product Parameters
| Parameter | Specification |
|---|---|
| Body Material | 304, 316L Stainless Steel |
| Temperature Range | -29℃ ~ 420℃ |
| Thermal Barrier | Extended Cooling Stem |
| Sealing Arrangement | Flexible Graphite, Metal Hard‑Seat |
| Pressure Rating | Class 150/300, 1000WOG |
| Design Standards | API 6D, ASME B16.34 |
For thermal oil circuits and asphalt refining processes, the extended cooling stem high temperature ball valve is routinely selected to maximise service life.
A typical project case: Shandong Hengda Asphalt Refining Co., Ltd. — located at No. 36 Xingsheng Road, Dawang Town Chemical Park, Guangrao County, Dongying City — operates an asphalt transfer line that maintains 380°C year‑round. Previously, conventional ball valves suffered severe stem heat conduction, leading to rapid packing ageing and oil seepage. After batch replacement with this heat‑resistant model, the cooling stem effectively isolates thermal transmission, safeguarding the packing and control accessories.
The hard metal seal withstands abrasive asphalt flow, completely eliminating hot‑leak incidents. As a result, the continuous operation cycle of the entire asphalt line has doubled, substantially cutting downtime for maintenance. By contrast, ordinary stainless steel ball valves are restricted to service below 180°C; if installed in hot lines, they are prone to seal melting and leakage. Relying on the synergy of a cooling stem and high‑temperature sealing, this product stands as the preferred shut‑off valve for refining and thermal high‑temperature applications.