Top Entry
model A31C
Model A31C combines the top entry concept — single-piece body, internals accessible from above, in-line maintainability — with cryogenic design features for low-temperature service. This is particularly valuable on LNG lines, where valves are typically welded into the pipe and removal for maintenance is not an option.
The A31C is available with double block and bleed and double isolation barrier (DIB) configurations, materials selected for low-temperature toughness (stainless steels, 6Mo, nickel alloys, titanium), and cryogenic testing at -196 °C per BS 6364 performed in-house before delivery.
| Applicable standards | API 6D or 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 or ASME B16.47 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 |
| Closure Design | Bolted Bonnet or Pressure seal |
| Ball support | Trunnion (small sizes < 4") - Support Plates |
| Seat design | Floating Self-Relieving - Floating Double Piston Effect Soft Sealing - Metal to Metal (Tungsten Carbide Coating) |
| Valve operation | Manual: Lever or Gearbox Actuated: Pneumatic / Hydraulic / Electric / Electro-Hydraulic |
| Available Materials | SS, 6Mo, Inconel, Incoloy, Hastelloy, Monel, Titanium NACE MR0175 according to client request. |
| Additional Features | Double Block and Bleed, Double Isolation Barrier (DIB), Anti Blowout Stem, Antistatic Device |
| 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 Fugitive Emission Test: ISO 15848 - 1 & 2 SIL Certificate up to SIL 3 PED 2014/68/UE Mod.H |
