API 6D Through-Conduit Slab Gate Valves
Zeron Fasteners manufactures high-performance API 6D Through-Conduit Slab Gate Valves designed for critical crude oil, high-pressure natural gas, refined petroleum, and offshore transmission pipelines. Featuring a precision-machined solid parallel slab gate with a full-bore circular conduit that aligns precisely with the pipe interior, our slab gate valves eliminate turbulence, achieve zero pressure drop, and facilitate seamless intelligent pipeline pigging.
Equipped with dual spring-energized floating seats providing continuous bi-directional mechanical contact, each valve guarantees true Double Block and Bleed (DBB) isolation. Integrated secondary sealant injection ports on both the stem and seats provide an instant emergency seal in critical pipeline operating environments.
100% Hydro-Tested
Technical Specifications & Engineering Matrix
Comprehensive dimensional, standard compliance, and metallurgy specifications for API 6D slab gate valves.
| Engineering Feature | Standard Specification & Conformance |
|---|---|
| Design & Manufacturing | API 6D ASME B16.34 ISO 14313 BS EN 12266 |
| Face-to-Face Dimensions | ASME B16.10 API 6D ISO 5752 |
| Flange End Connections | ASME B16.5 (Sizes 2" to 24"), ASME B16.47 Series A/B (Sizes 26" to 36") |
| Butt-Weld (BW) Dimensions | ASME B16.25 Schedule 40, Schedule 80, Schedule 160, XXS |
| Fire-Safe Certification | API 607 7th Edition API 6FA ISO 10497 Certified Fire-Safe |
| Pressure & Leakage Testing | API 598 API 6D (Hydrostatic Shell 1.5x, High-Pressure Gas Seat Zero Leakage Rate A) |
| Sour Gas Service Compliance | NACE MR0175 / ISO 15156 NACE MR0103 HIC / SSCC Tested |
| Fugitive Emissions | ISO 15848-1 Class AH, API 641 Low Emissions Certified |
| Part / Component | Standard Carbon Steel | Low Temp Service (-46°C) | Stainless & Duplex Alloys |
|---|---|---|---|
| Body & Bonnet | ASTM A216 WCB / A105 Forged | ASTM A352 LCB / LCC / LF2 Forged | ASTM A351 CF8M / Duplex F51 (UNS S31803) / F53 (S32750) |
| Through-Conduit Slab Gate | Carbon Steel + 75μm ENP Plated | ASTM A350 LF2 + ENP / Stellite Faced | ASTM A182 F316 / Duplex 2205 / 2507 Super Duplex |
| Floating Seat Rings | A105 + ENP / Hardfaced Stellite | A350 LF2 + ENP / Stellite Gr. 6 | ASTM A182 F316 / Duplex F51 + Inconel 625 Overlay |
| Seat Primary Soft Inserts | PTFE / R-PTFE / Nylon 12 | Devlon V-API / PEEK | PEEK / PCTFE / Metal-to-Metal Hardfacing |
| Stem | ASTM A182 F6a / AISI 410 | ASTM A182 F316 / 17-4PH (UNS S17400) | ASTM A182 F51 Duplex / Inconel 718 |
| Seat Energizer Springs | Inconel X-750 (NACE Compliant) | Inconel X-750 | Inconel 718 / Hastelloy C-276 |
| Bonnet Bolting & Studs | ASTM A193 B7 + A194 2H | ASTM A320 L7 / L7M + A194 Gr. 7 / 7M | ASTM A193 B8 / B8M + A194 Gr. 8 / 8M |
| Bonnet Gasket | Spiral Wound SS316 + Flexible Graphite | Spiral Wound SS316 + Graphite / RTJ Soft Iron | RTJ Ring Joint (Octagonal / Oval) SS316L / F51 |
| Nominal Size (Inches / DN) | Full Bore ID (mm) | Face-to-Face Class 150# (RF mm) | Face-to-Face Class 300# (RF mm) | Face-to-Face Class 600# (RF mm) | Face-to-Face Class 900# (RTJ mm) | Weight (Kg approx.) |
|---|---|---|---|---|---|---|
| 2" (DN50) | 51 mm | 178 mm | 216 mm | 292 mm | 371 mm | 42 - 68 kg |
| 3" (DN80) | 76 mm | 203 mm | 283 mm | 356 mm | 384 mm | 65 - 110 kg |
| 4" (DN100) | 102 mm | 229 mm | 305 mm | 432 mm | 460 mm | 95 - 165 kg |
| 6" (DN150) | 152 mm | 267 mm | 403 mm | 559 mm | 613 mm | 185 - 340 kg |
| 8" (DN200) | 203 mm | 292 mm | 419 mm | 660 mm | 740 mm | 290 - 580 kg |
| 10" (DN250) | 254 mm | 330 mm | 457 mm | 787 mm | 841 mm | 440 - 890 kg |
| 12" (DN300) | 305 mm | 356 mm | 502 mm | 838 mm | 968 mm | 620 - 1,250 kg |
| 16" (DN400) | 406 mm | 406 mm | 838 mm | 991 mm | 1,140 mm | 1,150 - 2,400 kg |
| 20" (DN500) | 508 mm | 457 mm | 991 mm | 1,194 mm | 1,400 mm | 1,950 - 3,800 kg |
| 24" (DN600) | 610 mm | 508 mm | 1,143 mm | 1,397 mm | 1,568 mm | 2,900 - 5,600 kg |
| Service Temperature (°C) | Class 150# (bar) | Class 300# (bar) | Class 600# (bar) | Class 900# (bar) | Class 1500# (bar) |
|---|---|---|---|---|---|
| -29°C to 38°C | 19.6 bar | 51.1 bar | 102.1 bar | 153.2 bar | 255.3 bar |
| 100°C | 17.7 bar | 46.6 bar | 93.2 bar | 139.8 bar | 233.0 bar |
| 150°C | 15.8 bar | 45.1 bar | 90.2 bar | 135.2 bar | 225.4 bar |
| 200°C | 13.8 bar | 43.8 bar | 87.6 bar | 131.4 bar | 219.0 bar |
| 250°C | 12.1 bar | 41.9 bar | 83.9 bar | 125.8 bar | 209.7 bar |
| 300°C | 10.2 bar | 39.8 bar | 79.6 bar | 119.4 bar | 199.1 bar |
Advanced Through-Conduit Principles
True Double Block & Bleed (DBB)
Two independent floating seat assemblies maintain simultaneous mechanical contact on upstream and downstream gate faces. The body cavity can be bled through the cavity drain plug while under full line pressure.
Full-Bore Piggable Conduit
When fully opened, the gate bore aligns flush with the pipeline inside diameter, preventing turbulence, eliminating pressure loss, and accommodating intelligent electronic cleaning and inspection pigs.
Emergency Secondary Sealant Injection
Fitted with button-head grease fittings and internal check valves at both the stem and seat rings, enabling emergency synthetic sealant injection to establish an instantaneous bubble-tight shutoff.
Automatic Thermal Cavity Relief
Trapped fluid in the closed body cavity automatically overcomes seat spring tension and vents safely into the pipeline when thermal expansion creates excess cavity pressure.
Where Zeron Slab Gate Valves Are Deployed
Certified for mission-critical pipeline networks, hazardous liquids, and severe gas service globally.
Cross-Country Crude Pipelines
Mainline isolation across hundreds of kilometers where regular mechanical scraping and ultrasonic intelligent pigging are essential to maintain line integrity.
High-Pressure Natural Gas Networks
Class 600# and 900# high-pressure gas distribution networks and compressor stations requiring zero gas leakage across seating surfaces.
Refining & Petrochemical Manifolds
Crude distillation, hydrocracking feed lines, and storage manifold manifolds demanding true DBB isolation for safe maintenance without shutdown.
Offshore Platforms & Subsea Lines
Manufactured in Duplex UNS S31803 and Super Duplex S32750 for extreme saline corrosion resistance on topside and riser pipelines.
Underground Gas Storage Terminals
Wellhead injection and withdrawal pipelines operating under cyclic pressures, low temperature chills, and rapid pressure fluctuations.
Sour Gas Service (NACE MR0175)
Engineered to prevent Sulfide Stress Cracking (SSC) and Hydrogen-Induced Cracking (HIC) in H2S-laden sour crude and gas streams.
Stringent Testing & Inspection Protocols
Every valve leaves our manufacturing facility with 100% factory acceptance testing according to API 6D and API 598.
Raw Material Testing
Optical Emission Spectrometry chemical verification, Charpy V-Notch impact testing at -46°C, and microstructure analysis for ferritic/austenitic balance.
Non-Destructive Testing (NDT)
100% Radiographic Testing (RT) on critical casting areas, Ultrasonic Testing (UT) on forged bodies, and Magnetic Particle (MPI) on welds and machined seats.
Hydrostatic & Gas Testing
Hydrostatic shell test at 1.5x rating pressure, high-pressure gas seat test at 1.1x design pressure, and low-pressure air seat test (6 bar) with zero allowable leakage.
MTR & Export Dossier
Issuance of EN 10204 Type 3.1 certification, dimensional compliance reports, third-party inspection sign-offs (TUV/BV), and maritime-grade export packing.
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Frequently Asked Questions
Key engineering clarifications regarding API 6D through-conduit slab gate valve selection and maintenance.
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