WCB top-entry ball valve controls fluid flow with a monobloc body design that minimizes leakage points and enables online maintenance. Its manufacturing process ensures high pressure containment, with broad applications across potable water, petrochemical, and power energy sectors. For nominal diameters below DN100, a double-inclined plane structure achieves self-compensating sealing via springs to ensure tight closure at low-to-medium pressures; sizes above DN100 adopt a trunnion-mounted design. This valve features Double Block and Bleed (DBB) functionality, fire-safe and anti-static compliance, bidirectional sealing capability, and retractable seat technology enhancing maintainability. Furthermore, the top-entry design permits component repair/replacement by removing the bonnet, while the bottom-loaded stem's reverse-sealing structure guarantees reliable packing seal integrity.
Specification
Ball Valve design according to API6D,BS5351,ASME B16.34
Face to face ASME B16.10,AP6D
End Flanges ASME B16.5/ASME B16.47
Butt welded ends ASME B16.25
Fire Safety API607,API6A
Inspection and test API 598,API6D
Material: WCB
Size Range: 2″~48″
Pressure Rating: ASME CL, 150, 300, 600
Temperature Range: -29°C~425°C
Type: Top entry, Flanged Ends
Advantages & Features
Simplified Construction
Top-entry ball valves feature exceptionally streamlined architecture enabling both easy installation and maintenance. This design significantly reduces fluid flow interruption and repair downtime, boosting operational efficiency by up to 70% during maintenance procedures (per API 6D Annex F access requirements).
Leak Prevention Guarantee
Utilizing advanced sealing materials (typically PTFE/RPTFE per API 622), these valves effectively eliminate fluid leakage, enhancing system reliability with <100 ppm fugitive emissions (tested per ISO 15848-1) and operational stability.
Reversible Flow Capability
The downward-seated ball mechanism during closure enables bidirectional flow regulation. This reversible flow direction functionality provides operational flexibility in process reversal scenarios (certified per API 6D Section 7.5 for bidirectional sealing).
Extensive Industry Application
Widely implemented across:
Water/Wastewater Treatment (AWWA C509)
Chemical & Pharmaceutical (ASME BPE compliant)
Oil & Gas (API 6FA fire-safe certified)
Power Generation (ASME Section III nuclear applications)
Metallurgy & Mining (ISO 15848 sour service)
