Slab
Model B11
The slab gate valve (model B11) uses a single-piece gate with a full circular bore, running between two floating, spring-loaded metal-to-metal seats. Line pressure pushes the gate against the downstream seat, providing the seal; in open position the conduit is completely unobstructed, allowing pigging and minimizing pressure drop and turbulence.
Compared with expanding designs, the slab gate offers a shorter face-to-face, lower weight and lower cost, while keeping the advantages of the through conduit concept. It is widely used on transmission pipelines, launcher/receiver stations and wellhead applications under API 6A — including high pressure classes up to API 10.000 psi, as supplied to Hess for the Scott field development in the UK North Sea.
Valland slab gate valves are designed to API 6D, API 6DSS or API 6A, with bolted bonnet, back seat for in-line stem seal maintenance, and manual (handwheel or gearbox) or actuated operation.
| Applicable standards | API 6D, API 6DSS and API 6A Design according to ASME B16.34 or ASME VIII Div. 1 & 2 |
| Pressure Class Range | ANSI Class 150 lbs. to 4500 lbs. API6A Class 3000 PSI to 15000 PSI |
| Size Range | API 6D - from 1/2" to 42" API 6A - from 1.13/16" to 13.5/8" |
| Ends design | Flanged (RF/RTJ) - ASME B16.5, ASME B16.47 or MSS SP-44 Flanged (6B/6BX) - API 6A 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 | Single piece |
| Bonnet Design | Bolted bonnet |
| Seat design | Non floating (without soft gasket) Metal to Metal (c/w hardfacing) |
| Valve operation | Manual: Handwheel or Gearbox Actuated: Pneumatic / Hydraulic / Electric / Electro-Hydraulic |
| Available Materials | CS, LTCS, SS, Duplex SS, Super Duplex SS, 6Mo, Inconel, Incoloy, Hastelloy, Monel, Titanium NACE MR0175 according to client request. |
| Additional Features | Double Block and Bleed, Normal or Reverse acting, Graphite or V-Pack stem sealing arrangement |
| Testing and Certification | Testing: Hydrostatic, High Pressure Gas, Pneumatic and Functional API 598 - API 6A PSL3G, API 6A PR2 & Endurance Fire testing: API 6FA, API 607, BS 6755 part 2, ISO 10497 Fugitive Emission Test: ISO 15848 - 1 & 2 SIL Certificate up to SIL 3 PED 2014/68/UE Mod.H Hyperbaric Test for Subsea application |
