L&T 6" Class 900 Globe Valve Grade 5A Duplex Supplier Gujarat | Awal Valve

L&T Duplex Stainless Steel Globe Valve (Bolted Bonnet, 6" Class 900, UNS S32205 / Grade 5A): Technical Specifications, Throttling Features, and Buying Guide

Introduction

In high-pressure offshore oil and gas production, aggressive chemical process throttling, desalination high-pressure pump discharge headers, and sour gas processing loops, precise flow regulation under severe corrosion conditions requires specialized metallurgy and high-integrity valve engineering. Operating a 6-inch globe valve under ASME Class 900 pressure rating involves substantial fluid thrust and dynamic pressure drops, necessitating robust wall casting, specialized seat hardfacing, and mechanical gear reduction.

The L&T Duplex Stainless Steel Globe Valve (Bolted Bonnet, 6" Class 900, Grade 5A) is engineered for linear flow control and tight shutoff in aggressive media at high working pressures. Manufactured by L&T Valves in compliance with BS 1873, API 623, and ASME B16.34 standards, this 6-inch Class 900 globe valve features a duplex stainless steel (UNS S32205 / ASTM A890 Grade 5A / CE3MN) cast body, a heavy multi-stud bolted bonnet joint, and an integrated bevel gear operator.

Product Overview

The L&T 6" Class 900 Grade 5A Globe Valve features a heavy-wall globe body pattern with an Outside Screw and Yoke (OS&Y), rising stem design, and an enclosed gear operator with a handwheel.

Constructed from ASTM A890 Grade 5A (UNS S32205 / CE3MN) cast duplex stainless steel, this valve provides exceptionally high mechanical yield strength combined with resistance to pitting corrosion, crevice corrosion, and chloride stress corrosion cracking (SCC). The heavy-duty bolted bonnet flange features high-tensile alloy/SS studs and a metal Ring-Type Joint (RTJ) or spiral-wound gasket. A top-mounted bevel gear operator ensures fine throttling adjustment and low handwheel operating effort under high differential pressures.

Technical Specifications

The certified engineering parameters for the L&T 6" Class 900 Grade 5A Globe Valve are detailed in the table below:

Key Features

• High-Strength Duplex Metallurgy (Grade 5A): Cast UNS S32205 duplex stainless steel provides roughly double the yield strength of austenitic SS 316, along with superior resistance to pitting (PREN ≥ 34) and chloride stress corrosion cracking.
• Class 900 Pressure Containment: Designed to contain working pressures up to 150 bar (2160 PSI) under high operational temperatures and harsh corrosive process streams.
• Precision Linear Flow Throttling: Parabolic plug contour offers repeatable flow control and low-vibration performance during partial-opening operation.
• Bevel Gear Reduction: Integrated bevel gearbox delivers precise stem travel increments while reducing manual handwheel torque during high differential pressure seating.
• Stellite-Hardfaced Seating Surfaces: Cobalt-base Stellite hardfacing on body seat ring and disc sealing faces prevents erosion, wire-drawing, and galling during high-velocity fluid throttling.
• Heavy Multi-Stud Bolted Bonnet: Reinforced body-bonnet flange joint with high-tensile studs maintains leak-tight body joint compression during pressure spikes and thermal cycling.

Applications

The combination of Grade 5A duplex stainless steel, Class 900 pressure rating, and precision throttling capability makes the L&T 6" Class 900 Globe Valve suitable for severe process lines:

• Offshore Oil & Gas Topsides: High-pressure seawater injection loops, produced water treatment headers, and sour gas (H2S/CO2) manifold throttling.
• Desalination High-Pressure RO Units: High-pressure reverse osmosis pump discharge isolation, brine energy recovery headers, and seawater bypass loops.
• Chemical & Fertilizer Processing: Acidic media control, chloride-bearing process fluid throttling, and high-pressure urea synthesis lines.
• Refining & Petrochemical Units: Hydrotreating unit letdown lines, sour water stripper throttling, and high-pressure chemical feed systems.

Benefits

• Superior Mechanical & Corrosion Resistance: Duplex 5A metallurgy prevents pitting and cracking in aggressive chloride environments while supporting higher pressure limits with reduced casting weight.
• Accurate Process Regulation: Linear stem travel paired with precision plug profile enables exact flow rate control compared to standard quarter-turn valves.
• Low Operating Effort: Bevel gear drive simplifies manual position adjustments without external mechanical leverage tools.
• In-Line Maintenance Capability: The bolted bonnet assembly permits field disassembly, disc inspection, and seat re-lapping during routine plant maintenance turnarounds.

L&T Valve Dealer in Ahmedabad and Gujarat

Industrial projects across Gujarat—including chemical complexes in Dahej (PCPIR), refineries in Jamnagar, LNG terminals in Hazira and Mundra, and pharmaceutical manufacturing hubs in Ahmedabad—require high-pressure corrosion-resistant process hardware. Sourcing through an authorized L&T valve dealer in Ahmedabad guarantees authentic products supplied with original 3.1 Manufacturer Test Certificates (MTC) and full material heat traceability.

Key industrial corridors with active demand for L&T duplex stainless steel and high-pressure globe valves include:

• Ahmedabad: Special chemical and process equipment manufacturing clusters in Vatva, Naroda, Odhav, Changodar, and Sanand.
• Major Gujarat Industrial Belts: Vadodara, Ankleshwar, Bharuch (Dahej PCPIR), Jamnagar, Surat (Hazira), Vapi, and Mundra.

Partnering with an established L&T valve supplier in Gujarat simplifies procurement logistics, ensures competitive pricing, and offers expert technical support for severe-service valve selection.

Why Choose Awal Valve

When procuring specialized process equipment like the L&T 6" Class 900 Grade 5A Globe Valve, L&T CS ball valve, or L&T SS ball valve, Awal Valve is your premier industrial supply partner across Gujarat.

Why partner with Awal Valve:

• 100% Genuine L&T Inventory: Direct factory supply accompanied by official Manufacturer Test Certificates (MTC, 3.1) and complete material heat numbers.
• Comprehensive Valve Range: Access to L&T gate, globe, check, and ball valves in standard, duplex, and super duplex stainless steels across Class 150 to Class 2500 ratings.
• Actuation Engineering Support: Assistance in selecting gear operators, pneumatic diaphragm actuators, or electric drives for high-pressure throttling service.
• Competitive Project Pricing: Transparent market pricing tailored for EPC contractors, chemical plant operators, and refinery turnarounds.

Conclusion

The L&T Duplex Stainless Steel Globe Valve (Bolted Bonnet, 6" Class 900, Grade 5A) is a high-performance flow control solution engineered for severe high-pressure, highly corrosive applications. Combining cast UNS S32205 duplex metallurgy, Class 900 pressure containment, Stellite hardfaced seats, a multi-stud bolted bonnet, and high-ratio gear actuation, it provides long-term operational safety, corrosion protection, and precise throttling reliability.

For price quotations, flow coefficient (Cv) datasheets, or quick procurement in Gujarat, contact Awal Valve—your trusted L&T ball valve dealer and process valve specialist.

Frequently Asked Questions (FAQs)

Q1: What are the primary advantages of ASTM A890 Grade 5A (UNS S32205) duplex steel over SS 316?

A: Grade 5A duplex stainless steel offers approximately twice the yield strength of austenitic SS 316, along with significantly higher resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.

Q2: Why is a gear operator recommended on a 6" Class 900 globe valve?

A: Because globe valves seat against direct line pressure, operating a 6-inch plug against Class 900 pressure (up to 150 bar) requires high stem thrust. The bevel gear operator reduces manual handwheel effort to safe, single-operator levels.

Q3: Can a 6" Class 900 globe valve be fitted with an automatic actuator?

A: Yes, the yoke top flange interface supports mounting electric motor actuators or pneumatic diaphragm/piston actuators for automated process throttling or remote shutoff.

Q4: How can I procure authentic L&T duplex stainless steel globe valves in Gujarat?

A: You can source authentic L&T duplex and super duplex valves directly through a trusted L&T valve supplier in Gujarat like Awal Valve, complete with official 3.1 manufacturer test certification.

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