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KSB Compact Ball Valve Class 400/800 Socket Weld & Threaded

ECOLINE BLC-S 3-piece design. Class 400 (PTFE seat) and Class 800 (RPTFE seat). Socket weld, threaded NPT/BSP. WCB, CF8, CF8M, A105. Blow-out proof stem. Hollow ball option for steam service. NPS ½–2.

Multi-Material CompactClass 400, 800NPS ½–2

Specifications

ParameterSpecification
SeriesECOLINE BLC-S
Body MaterialA216 WCB / A351 CF8 / A351 CF8M / A105
Pressure ClassClass 400, 800
Size RangeNPS ½–2
Max Temperature260°C (RPTFE seat in Class 800)
Max Pressure138 bar (Class 800)
Design StandardEN ISO 17292
End ConnectionsSocket Weld (ASME B16.11), Threaded NPT/BSP
ConstructionBlow-out proof stem, 3-piece body, hollow ball option
Trim / SealingPTFE seat (Class 400), RPTFE seat (Class 800)
✓ EN ISO 17292

Material & Applications

Why Multi-Material Compact: Available in carbon steel (WCB/A105) and stainless steel (CF8/CF8M) to match the piping material. Class 800 with RPTFE seat handles higher temperatures than standard PTFE. The hollow ball option is critical for steam service — it prevents trapped condensate from flashing to steam inside the ball cavity, which can cause dangerous overpressure.

Typical applications: Small-bore process isolation, instrument root valves, steam service (with hollow ball), drain and vent valves, compact piping systems. 3-piece design allows inline maintenance without removing the valve from the pipeline.

Pressure/Temperature Ratings

RatingPressure at Temperature
WCB Cl 400~70 bar @ ambient
WCB Cl 800~138 bar @ ambient

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Other Variants

Flanged WCB Class 150/300 Trunnion Mounted NPS 8+ All Ball Valves →

Service Area

Pune, Ahmednagar & Beed.

Multi-Material Compact Ball Valve FAQs

Why hollow ball for steam?
A solid ball traps fluid in the ball cavity when closed. In steam service, trapped condensate can flash to steam when temperature rises, causing dangerous overpressure inside the ball. Hollow ball (with a vent hole) eliminates this risk by preventing fluid from being trapped. Always specify hollow ball for steam applications.
What is the advantage of 3-piece design?
The 3-piece body allows the center section to be removed for inline maintenance. You can replace seats, inspect the ball, and service internals without removing the valve from the pipeline or cutting the pipe. This reduces maintenance time and cost significantly.
Class 400 vs Class 800?
Class 400 uses PTFE seat (max ~200°C) and has lower pressure rating (~70 bar). Class 800 uses RPTFE seat (max ~260°C) and has higher pressure rating (~138 bar). Choose Class 800 for higher pressure/temperature or when the piping spec requires it.

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