Floating
model A21, A42, A43, A44
In a floating ball valve the ball is supported by the seats themselves rather than by trunnions: line pressure pushes the ball against the downstream seat, providing the seal. Valland floating ball valves are the standard choice for small bore, low-to-medium pressure isolation duties where a compact, economical and reliable valve is required.
The range covers models A21 (standard floating), A42, A43 and A44 — including double block and bleed (A42) and single block and bleed (A44) executions — designed to API 6D with sizes from 1/2" to 8". Seats are available in soft sealing or metal-to-metal execution with hardfacing; all valves feature anti-blowout stem and antistatic device, and are fire safe tested per API 6FA, API 607 and ISO 10497.
Floating ball valves are regularly supplied within larger Valland packages: the Santos Barossa FPSO project (BW Offshore, Australia) included A21 floating and A42/A44 block-and-bleed floating valves among its 182 valves, and DBB floating valves in super duplex F55 were supplied for the BP Rumaila field (Iraq) through Petrofac.
| Applicable standards | API 6D Design according to ASME B16.34 or ASME VIII Div. 1 & 2 |
| Pressure Class Range | ANSI Class 150 lbs. to 4500 lbs. |
| Size Range | From 1/2" to 8" |
| Ends design | Flanged (RF/RTJ) - ASME B16.5, ASME B16.47 or MSS SP-44 Compact (Norsok Standard L-005) Butt-Weld (ASME B16.25) and/or Butt-Weld + Pipe Hubbed according to client Clamp Special client's requirements |
| Body Design | Two or Three Pieces |
| Closure Design | Bolted Closure |
| Seat design | Soft Sealing - Metal to Metal (c/w hardfacing) |
| Valve operation | Manual: Lever or Gearbox |
| Available Materials | CS, LTCS, SS, Duplex SS, Super Duplex SS, 6Mo, Inconel, Incoloy, Hastelloy, Monel, Titanium NACE MR0175 according to client request. |
| Additional Features | Anti Blowout Stem, Antistatic Device |
| Testing and Certification | Testing: Hydrostatic, High Pressure Gas, Pneumatic and Functional API 598 - API 6D Fire testing: API 6FA, API 607, BS 6755 part 2, ISO 10497 Fugitive Emission Test: ISO 15848 - 1 & 2 PED 2014/68/UE Mod.H |
