The API 6A slab gate valve is a critical component in wellhead and Christmas tree systems, designed for high-pressure, high-temperature (HPHT) applications in oil and gas production. Below are the key technical parameters as per API 6A standards:
Design & Standards Compliance
API 6A (22nd Edition or latest)
ISO 10423 (International equivalent)
Pressure Classes: 2000 psi (13.8 MPa) to 20,000 psi (138 MPa)
Temperature Ratings: -50°C to 121°C (P-U) (per API 6A, with higher ratings available)
Material Classes: AA, BB, CC, DD, EE, FF, HH (based on corrosion resistance & strength)
Materials
Body & Bonnet: AISI 4130, 4140, F22, F316, F51 (Duplex Stainless Steel)
Gate & Seat: Stellite 6, Inconel 718, 13Cr, Super Duplex
Seals: Elastomers (HNBR, FKM), Metal-to-Metal Sealing
Operating Conditions
Max Working Pressure: Up to 20,000 psi (138 MPa)
Temperature Range: -50°C to 121°C (Standard), up to 343°C (HPHT)
Fluid Service: Oil, Gas, Water, H₂S (Sour Service per NACE MR0175)
End Connections
Flanged (ASME B16.5, API 6A)
Butt-Weld (for high-pressure piping)
Ring-Type Joint (RTJ) for high-integrity sealing
Testing & Certification
Pressure Testing: Per API 6A (Shell Test, Seat Test, Backseat Test)
Fire Testing: API 6FA / ISO 10497
NACE MR0175: For sour service (H₂S environments)
Certifications: API Monogram, CE, PED (for EU markets)
Valve Sizes & Pressure Ratings
Size (in) Pressure Rating (psi) Bore Type
| 2-1/16″ |
2000 – 20,000 |
Full / Reduced |
| 2-9/16″ |
2000 – 15,000 |
Full / Reduced |
| 3-1/8″ |
2000 – 15,000 |
Full / Reduced |
| 4-1/16″ |
2000 – 10,000 |
Full / Reduced |
| 5-1/8″ |
2000 – 10,000 |
Full / Reduced |
| 7-1/16″ |
2000 – 5000 |
Full / Reduced |
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