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Gate Valves for Oil & Gas

Gate valves remain the primary on/off isolation valve across oil & gas upstream, midstream, and downstream applications — from ANSI Class 150 crude oil gathering lines to Class 2500 high-pressure wellhead isolation. Vajra Industrial Solutions supplies API 600 steel gate valves in carbon steel (WCB), low-temperature steel (LF2), and duplex (F51) grades with full NACE MR0175 compliance for sour service, complete with API 598 pressure test certificates and EN 10204 3.1 material test certificates.

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Key Applications — Gate Valves in Oil & Gas

Crude Oil Pipeline Block Valves

Full-bore gate valves for crude oil trunk line isolation, scraper trap kickers, and meter station block duty. Rising stem OS&Y design provides clear visual indication of valve position. Full bore ensures pigging compatibility. DBB design available for metering station isolation and safe maintenance.

DN50–DN600, Class 150–600, A216 WCB, NACE MR0175, API 600, API 6D

Refinery Process Isolation

Gate valves for crude distillation unit (CDU) feed and product isolation, vacuum unit (VDU) residue lines, and hydrocracker/hydrotreater feed/effluent service. High-temperature alloy steel (WC6/WC9) for furnace outlet and reactor effluent above 340°C. Sour service compliance for hydrogen-rich and H₂S-containing streams.

DN25–DN400, Class 300–900, WCB / WC6 / WC9, NACE MR0175, API 600, ASME B16.34

Gas Transmission — Compressor Station Isolation

Gate valves for natural gas compressor station suction/discharge isolation, scrubber inlet/outlet, and dehydration unit connections. Low-temperature carbon steel (A352 LCC or A350 LF2) for cold climate gas stations exposed to -45°C. Fire-safe packing and body-cavity pressure relief (thermal relief) for gas service.

DN50–DN400, Class 300–900, A350 LF2 / A352 LCC, NACE MR0175, API 600, -45°C rated

Sour Gas Service (H₂S) — NACE Compliant

NACE MR0175 / ISO 15156 compliant gate valves for sour gas wells, amine treating units, and sulfur recovery units (SRU). Body, bonnet, trim, and bolting must all meet NACE hardness limits (HRC ≤22 for carbon steel). Duplex F51 or SS F316 trim for wet sour service. HIC (hydrogen-induced cracking) tested plate for body if required by NACE.

DN25–DN300, Class 150–900, NACE MR0175, HRC ≤22, A182 F316 trim, API 600

Required Certifications

API 600 — Steel Gate Valve Design StandardNACE MR0175 / ISO 15156 — Sour service complianceAPI 598 — Pressure TestingEN 10204 3.1 MTCs — Full material traceabilityAPI 607 — Fire-safe testing (hydrocarbon service)ASME B16.34 — Pressure-temperature ratingsIBR (Indian Boiler Regulations) — if steam service in India

Recommended Materials

A216 WCB (carbon steel) — general duty oil and gas to 425°C
A350 LF2 (low-temp CS) — arctic/cold climate gas service to -46°C
A352 LCC (low-temp cast) — cold service cast alternative
A217 WC6 (1.25Cr-0.5Mo) — high-temperature refinery service to 540°C
A182 F51 / A890 4A (Duplex 2205) — corrosive and offshore service
A182 F316 SS trim — sour service, wet H₂S environments

Selection Factors

Sour service: Verify H₂S content — NACE MR0175 compliance mandatory above threshold partial pressure
Temperature: WCB to 425°C; WC6 to 540°C; LF2 to -46°C for cold-climate installations
Pressure class: Match ASME B16.34 P-T curve for operating temperature at design pressure
Bore: Full bore for pigging capability; reduced bore acceptable where pigging not needed
Bonnet: Bolted for Class 150–600; pressure-seal for Class 900–2500
Fire-safe: API 607 packing and fire-safe design required for all hydrocarbon service
Actuation: Gear operator for DN150+ manual; electric/hydraulic for remote-operated block valves

Technical FAQs

Why are gate valves preferred over ball valves at large bore in oil & gas?
For DN300 and above, gate valves are typically less expensive than equivalent full-bore trunnion ball valves and have a lower face-to-face (F-F) dimension, reducing pipe spool costs. Gate valves are also better suited for high-temperature service (WC6/WC9 body without soft-seat concerns) and can be packed online without removal. Ball valves are preferred for frequent operation and pigging service; gate valves for infrequent isolation at large bore.
What does OS&Y mean on a gate valve?
OS&Y stands for Outside Screw and Yoke. In an OS&Y gate valve, the stem is threaded on the outside — when the valve is open, the threaded stem rises visibly above the handwheel, providing a clear visual indication of valve position. This is the standard configuration for all oil, gas, and refinery gate valves. It also allows the packing to be replaced or tightened while the valve is under pressure by using the back-seat feature.
Can gate valves be used for throttling in oil & gas?
No — gate valves should never be used for throttling (partially open) service. When partially open, the high-velocity flow causes wire-drawing (erosion) on the gate and seat faces, causing premature leakage. Gate valves are strictly on/off isolation valves. For flow regulation in oil & gas, use a globe valve (small bore) or control valve (automated throttling).

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Gate Valves for Oil & Gas

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