This article is written for Slab Gate Valve used in oilfield API 6A high-pressure flowline, wellhead and manifold service. The product should be confirmed by its real oilfield service position, not only by a short catalogue name. For API oilfield equipment, the useful specification combines pressure rating, nominal size, end connection, service condition, material or seal requirements, and inspection documents.
Slab gate valves provide full-opening on/off isolation in wellhead equipment and high-pressure manifolds. They are not flow-direction-control or throttling devices; operating a partially open gate under erosive flow can damage the gate and seats.
The displayed flanged models include rising- and non-rising-stem configurations from 5,000 psi (35 MPa) to 15,000 psi (105 MPa). Each nominal size, pressure rating, end connection, material class, PSL and temperature class must be specified as a valid API Spec 6A combination.
In field layouts, the first question is where the component sits in the pressure path and what equipment it must connect to. The answer affects connection direction, pressure class, access for operation and future maintenance.
Key points to confirm
For Slab Gate Valve, we normally recommend confirming the following items before quotation, production or replacement.
- Contractually applicable API Spec 6A edition, PSL and performance requirement for the ordered valve.
- Working pressure, test pressure, nominal size and bore requirement.
- End connection type, mating equipment, flow direction and installation space.
- Service condition: standard, low-temperature or sour service; for sour service, provide the environmental limits needed for NACE MR0175/ISO 15156 material selection.
- Required documents such as MTC, pressure test report, NDT report and third-party inspection.
Field use and inspection
Slab Gate Valve should be checked as part of the complete high-pressure system. Sealing surfaces must be protected, connections should be clean before make-up, and the product should not be forced into alignment by side load, hammering or pulling. If leakage, abnormal operation or pressure-test instability occurs, the model, pressure, medium, photos and test conditions should be recorded for technical review.
Information for quotation
For new projects, please provide the line layout, operating pressure, medium, temperature, connection standard and document requirements. For replacement work, old-part photos, nameplate or body markings, end-connection close-ups and installation position help us confirm the correct Slab Gate Valve quickly.