L&T 20" Class 900 Gate Valve Bolted Bonnet Supplier Gujarat | Awal Valve

L&T Severe-Service Gate Valve (Bolted Bonnet, 20" Class 900): Technical Specifications, Features, and Buying Guide

Introduction

In high-pressure oil and gas transmission headers, thermal power generation loops, offshore production manifolds, and heavy hydrocarbon refining processes, isolating large-diameter flows under high pressure requires specialized flow control hardware. At a 20-inch nominal diameter and ASME Class 900 pressure rating, fluid thrust forces and operational loads mandate heavy-duty wall casting, high-tensile body-bonnet bolting, and mechanical gear reduction.

The L&T Severe-Service Gate Valve (Bolted Bonnet, 20" Class 900) is engineered to provide absolute pressure containment and bidirectional drop-tight isolation in high-pressure piping systems. Manufactured by L&T Valves in strict compliance with API 600, API 6D, and ASME B16.34 standards, this 20-inch Class 900 gate valve features a heavy bolted bonnet joint, hardfaced seating surfaces, and a factory-fitted bevel gear operator.

Product Overview

The L&T 20" Class 900 Bolted Bonnet Gate Valve features a heavy-wall cast steel body with an Outside Screw and Yoke (OS&Y), rising stem design, and a top-mounted gear operator.

Constructed from heavy-section cast steel materials—such as ASTM A216 WCB carbon steel, ASTM A217 WC6/WC9 chrome-moly alloy steel, or ASTM A351 CF8M stainless steel—this valve is built to handle ASME Class 900 working pressures. The reinforced body-bonnet flange joint utilizes high-tensile alloy studs and a pressure-energized metal Ring-Type Joint (RTJ) gasket. An enclosed bevel gearbox mounted on the yoke ensures controlled, single-operator manual operation under high differential pressures.

Technical Specifications

The certified engineering parameters for the L&T 20" Class 900 Gate Valve are detailed in the table below:

Key Features

• Class 900 High-Pressure Containment: Engineered with heavy-section body casting walls rated to safely contain working pressures up to 150 bar (2160 PSI) depending on operational temperature.
• Heavy Multi-Stud Bolted Bonnet: Reinforced body-bonnet flange joint utilizing high-tensile alloy studs and a metal RTJ gasket provides pressure containment against thermal cycling and pressure surges.
• Bevel Gear Torque Assist: Integrated enclosed bevel gear operator provides high mechanical advantage, enabling manual handwheel operation without excessive rim pull under high differential pressures.
• Stellite-Hardfaced Seating: Cobalt-base Stellite hardfacing on body seat rings and flexible wedge surfaces resists seat erosion, galling, and wire-drawing under high-velocity flow.
• Flexible Wedge Design: Precision-machined flexible wedge prevents mechanical binding caused by piping loads and thermal expansion during system heat-up.
• Stem Protection Sleeve: Enclosed upper stem tube shields external rising stem threads from dirt, dust, atmospheric weather, and external damage.

Applications

The heavy-duty design and high pressure rating of the L&T 20" Class 900 Gate Valve make it ideal for severe-service industrial installations:

• Oil & Gas Mainlines & Terminals: High-pressure crude oil trunklines, natural gas reinjection manifolds, and offshore platform headers.
• Thermal Power Generation: High-pressure steam isolation lines, boiler feed pump discharge isolation, and turbine bypass control loops.
• Petrochemical & Hydrocarbon Refining: Hydrocracker unit feed isolation, catalytic reformer lines, and severe hydrogen service loops.
• Cross-Country Pipeline Headers: Main isolation valves for high-pressure gas compressor stations and oil transfer skids.

Benefits

• Smooth Gear-Driven Operation: High gear reduction ratios allow smooth opening and closing cycles without requiring supplemental lever bars.
• Extended Wear Resistance: Stellite hardfaced trim extends valve life by preventing seat erosion during high differential pressure seating.
• Reliable Joint Sealing: Multi-stud flange design combined with metallic RTJ gaskets preserves sealing compression under variable thermal and pressure conditions.
• Field Maintainability: The bolted bonnet permits straightforward internal wedge inspection, seat re-facing, and stem packing replacement during planned turnarounds.

L&T Valve Dealer in Ahmedabad and Gujarat

Industrial sectors across Gujarat—including refineries in Jamnagar, petrochemical complexes in Dahej (PCPIR), thermal power stations in Mundra, and chemical plants in Vadodara and Ankleshwar—rely on high-pressure process equipment. Sourcing through an authorized L&T valve dealer in Ahmedabad ensures authentic products supplied with 3.1 Manufacturer Test Certificates (MTC) and complete material heat traceability.

Key industrial corridors with active demand for L&T high-pressure Class 900 valves include:

• Ahmedabad: Industrial manufacturing hubs 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 provides technical support for high-pressure valve integration.

Why Choose Awal Valve

When procuring critical process equipment like the L&T 20" Class 900 Gate Valve, L&T CS ball valve, or L&T SS ball valve, Awal Valve is your premier supply partner across Gujarat.

Why partner with Awal Valve:

• 100% Genuine L&T Inventory: Factory-direct products delivered with original Manufacturer Test Certificates (MTC, 3.1) and full material heat numbers.
• Comprehensive Range: Access to L&T gate, globe, check, and ball valves across Class 150 through Class 2500 pressure classes.
• Actuation & Technical Support: Expert assistance in specifying gear operators, electric motor actuators, or pneumatic drives for severe-service valves.
• Competitive Pricing: Market-aligned pricing structures for EPC contractors, engineering consultants, and turnaround maintenance orders.

Conclusion

The L&T Severe-Service Gate Valve (Bolted Bonnet, 20" Class 900) is an exceptional flow isolation solution engineered for large-bore, high-pressure energy and refining applications. Combining heavy-wall section casting, Stellite hardfacing, a multi-stud bolted bonnet joint, and high-torque gear assistance, it delivers long-term operational safety and zero-leakage isolation for critical process systems.

For price quotations, product datasheets, or quick procurement in Gujarat, contact Awal Valve—your trusted L&T ball valve dealer and industrial process valve partner.

Frequently Asked Questions (FAQs)

Q1: What is the main structural difference between Class 600 and Class 900 gate valves?

A: Class 900 gate valves feature significantly thicker body casting walls, larger flange dimensions, heavier stud bolting, and higher pressure ratings (up to 150 bar / 2160 PSI) to handle higher pressure levels than Class 600 valves.

Q2: What bonnet gasket type is used on 20" Class 900 bolted bonnet gate valves?

A: Class 900 gate valves typically use pressure-energized metallic Ring-Type Joint (RTJ) gaskets fitted into precision-machined grooves to maintain pressure tightness during thermal cycling.

Q3: Can a 20" Class 900 gear-operated valve be converted to electric motor actuation?

A: Yes, the yoke top flange and stem drive assembly conform to standard ISO 5210 mounting patterns, allowing conversion to electric motor actuators (such as Rotork or AUMA).

Q4: How can I procure authentic L&T Class 900 high-pressure gate valves in Gujarat?

A: You can source authentic L&T high-pressure valves directly through an established L&T valve supplier in Gujarat like Awal Valve, complete with official 3.1 manufacturer test certification.

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