L&T Ball Valves are available in single-piece, two-piece and three-piece constructions. In these valves, line pressure forces the floating ball against the downstream seat to effect bubble-tight sealing.

Blowout Proof Stem. The side-entry stem of L&T Ball Valves has a shoulder that bears against a matching shoulder in the body to make it blowout proof - the higher the line pressure, the better the sealing to atmosphere.

High Integrity Stem Sealing. Sealing to atmosphere is further enhanced by stem thrust seals and stem packing rings. To compensate for wear and thermal expansions, Belleville springs are used.

Mirror-finished Solid Stainless Steel Balls. To obtain bubble-tight sealing and lower operating torques, mirror-finished SS balls are used as a standard. The solid construction of the balls guarantees higher structural strength.

Seats with Pressure-relieving Slots. Seats with fine grain structure are used to ensure better strength and longer life. Pressure-relieving slots are a unique feature of L&T Ball Valves. The slots relieve upstream pressure when the valve is in closed position and prevent seat damage.

Actuator Mounting Flange. L&T single-piece and two-piece Ball Valves are provided with an integral actuator mounting flange conforming to ISO 5211. Please note that full bore valves in sizes DN 15 to DN 25 would be supplied with mounting arrangement as per L&T's manufacturing standard.

Fire-Safe Feature. L&T fire-safe Ball Valves feature secondary metal seats. In the event of a fire, after the soft-seat totally sublimates, the ball moves and abuts the downstream metal seat to form a leak-tight seal.

Cavity Pressure Relief Mechanism. A slight increase in temperature of fluid entrapped in ball cavity can cause a rapid increase of pressure and damage the ball and seats. To prevent this, L&T Ball Valves are equipped with automatic cavity relief mechanisms. When the valve is in open position, a hole provided on the ball connects the body cavity to the ball port and thereby ensure that cavity pressure does not build up. In the closed condition, when the cavity pressure rises above a designated level, the seat lip deflects to relieve pressure to the upstream side.

Antistatic Feature. Static electricity builds up inside a valve when the ball rubs against non-metallic seats. This is a fire hazard, especially in flammable fluid pipelines. L&T Ball Valves have inbuilt antistatic mechanisms to provide electrical continuity. Stems of full bore valves of size 65 mm and above and regular bore valves of size 80 mm and above are equipped with spring-loaded plungers. In valves of smaller sizes, electrical continuity is achieved by using Carbon-filled PTFE thrust seal and graphite stem packings.

On-line Service. Three-piece Ball Valves are designed for easy on-line service. To access the valve internals, remove three connector bolts and swing the body out using the fourth bolt as a pivot.

Standards

Material of Construction

L&T Valves manufactures a wide range of Globe Control Valves for the power and hydrocarbon industries. The valves are designed using state-of-the-art 3D design, simulation and analysis software. Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) are used to fine-tune product performance. Rigorous prototype tests - both in-house and at advanced flow-control research establishments - ensure that the customised solutions meet customer expectations.

Products

1. Valves for Standard Service (Top-guided, T-series)

2. Valves for Severe Service (Cage-guided, C-series)

3. Valves for Special Applications

Range

1. ASME classes from 150 to 4500

2. Sizes up to 24" (600 mm)

Body Configurations

1. Straight pattern

2. Angle Valves

Compliance Standards

1. Pressure Temperature Rating - ASME B16.34

2. Leakage Class - ANSI/ FCI 70-2

3. Hydrodynamic Noise - IEC 60534-8-4

4. Aerodynamic Noise - IEC 60534-8-3

L&T Globe Control Valves are offered in a variety of trim, actuation and materials to meet customer requirements.

Seat & Trim Options

1. Seat Type - Quick Change (Default)

2. Optional Seat Type - Welded Seat and Threaded Seat

3. Plug Options - Balanced and Unbalanced

4. Leakage Class - Up to Class VI

5. Trim Types - Contoured, V-Port, Cage and Multi-Cage

6. Trim Characteristics - Linear, Equal Percentage and Quick Opening

Actuator Options

1. Pneumatic � Spring & Diaphragm

2. Pneumatic - Piston

3. Electro - Hydraulic

4. Electrical

L&T Valves manufactures a comprehensive range of Butterfly & Check Valves. The range addresses water treatment and distribution systems, power plants, utility lines, fire water lines and HVAC.

1. Integrally-moulded Butterfly Valve in PN 10

2. Integrally-moulded Butterfly Valve in PN 16

3. Integrally-moulded Butterfly Valve in Class 150

4. Integrally-moulded Butterfly Valve in PN 25

5. Dual-plate Check Valve

6. Large-size Fabricated Steel Butterfly Valve

7. Fabricated Steel Check Valve

The versatile range is available in various body styles, materials, and actuation options to suit customer requirements.

PN-10 Rating

PN-16 Rating

Class 150 Rating

PN 25 Rating

Large Size Fabricated Steel Butterfly Valves

Aquaseal Check � Dual Plate Check Valves

Aquaseal FabChek Fabricated Steel Check Valve

Aquaseal FabChek Fabricated Steel Check Valve compliments Aquaseal Max Large-size Fabricated Steel Butterfly in water distribution systems and power plants. The valve is fabricated from carbon steel plates, and body and disc seats are hard-faced using 13% Cr. Steel. Smooth closure of the valve is ensured by using a counter weight. The valve can be supplied with hydraulic dash pot to prevent disc slamming and water hammer. Automated Fab Chek can be supplied with hydraulic dash pot to prevent disc slamming and water hammer. Automated Fab Chek can also be used as combined shut-off and non-return valve on pump discharge lines. The valve is available in PN6, PN 10 and PN 16 pressure ratings with flanged ends.

L&T Valves manufactures a comprehensive range of Gate, Globe & Check Valves (GGC) in sizes up to 42" (1050 mm) and in ASME classes from 150 to 4500. The valves are offered in combination of size, pressure class, material, end-connection, etc., to suit myriad applications in power and hydrocarbon sectors.

Compliance Standards

L&T Gate, Globe & Check Valves are designed in accordance with key international standards. They also meet the requirements of major power and oil & gas industry standards and customer specifications.

Materials of Construction

The product portfolio encompasses valves in carbon steel, stainless steels and alloy steels, in cast and forged materials, in a number of trim options - suitable for line-fluids ranging from low temperature hydrocarbon to super-critical steam.

Trim Materials

L&T Forged Steel Gate, Globe and Check Valves have established themselves the world over for their quality, reliability and long service. Rugged and compact in design, these valves are manufactured to the latest international designs using advanced manufacturing techniques and stringent quality control checks. The valves are regularly supplied to major Indian and international clients including oil refining companies and EPC contractors. They are available in a range of sizes starting from 1/4" to 2" (in reduced-bore design) and from 3/8" to 11/2" (in full-bore design).

L&T Valves Limited is a wholly owned subsidiary of Larsen & Toubro. Backed by an fifty-year track-record of excellence and world-leading innovation, the company provides engineered flow-control solutions for key sectors of the economy. L&T Valves Limited is synonymous with world-class manufacturing and quality assurance systems. Our plants have the agility and flexibility to deliver a wide variety of valves against time constraints and dynamic market demands. International safety, health and environment standards govern every phase of the manufacturing process.

Compliance Standards

Body and Trim Combinations

Trim Materials

L&T Forged Steel Valves are offered with trims shown below, to suit a variety of services

Salient features

1. Bolted body-bonnet design for valves up to Class 800. Valves with welded bonnet also available on request

2. Screwed with seal-welded body-bonnet design for valves of Class 1500

3. Bellows-sealed Gate and Globe valves available in Class 800

4. Bolted body-bonnet joints provided with spiral-wound stainless steel gasket and graphite filler for maximum protection against leaks

5. Die-formed graphite inner packing rings and braided graphite end rings with Inconel wire reinforcement and corrosion inhibitor

6. T-head stem-disc connection of gate valve fully meets strength requirements of API 602 and API 598

7. Rolled ACME thread on stem for smooth operation

8. Tapered shoulder on the stem for back seating

9. Self-aligning type gland assembly with stud-and-nut tightening

10. Integral hard-faced body seat for globe and check valves

11. Spring-loaded disc on check valves suitable for nonhorizontal applications too

12. Gate and globe valves can be offered with electrical actuators

13. Austenitic SS forging for body and bonnet of Cryogenic valves, resulting in excellent impact strength, minimal heat loss and resistance to corrosion

14. Valves can be offered to NACE MR-0175 and other special NACE requirements

15. Valves can be supplied with IBR certification

Aquaseal Check Valve is a soft-seated dual-plate check valve that conforms to API 594. The valve with cast iron body is available in sizes 2" (50�mm) to 8" (200 mm), in PN 10, PN 16 and ASME Class 125 pressure ratings.

Features & Benefits

1. Patented retainer-less design - High integrity sealing, facilitates quick disassembly at site.

2. Two independent seats - Consistent sealing even in uneven flow.

3. Raised profile of the soft seat enhances sealing.

4. Integrally moulded liner.

5. Stopper pin prevents the discs from coming into contact with each other and thus prevents disc damage. The stopper pin also prevents spring failure by ensuring that the discs don't travel beyond the full-open position.

6. For sizes 6" and above, lifting eyebolt option is provided.

7. Drain connections provided on demand.

Compliance Standards

Materials of Construction

Trunnion-mounted Ball Valves

L&T Valves manufactures a comprehensive range of Trunnion mounted Ball Valves in sizes up to 56" (1400 mm) in ASME classes from 150 to 2500. The valves are offered in a variety of body styles, materials, trims and actuation options to address critical services in hydrocarbon, power and allied industries. L&T Trunnion-mounted Ball Valves (TMBV) meet the requirements of API 6D and can be offered with API 6D monogram. The valves are certified Fire Safe as per API 6FA, API 607 and ISO 10497, and meet the requirements of ISO 15848 (Fugitive Emission). L&T TMBV is certified SIL-3 capable (Safety Integrity Level-3) as per IEC 61508 and can be offered with actuators and accessories to meet customer demands. All critical machining operations on L&T Trunnion-mounted Ball Valves are carried out on 5-axis machining centres and CNC machines.

Compliance Standards

Trunnion-mounted Ball Valves are designed in accordance with key international standards. They also meet the requirements of major power and oil & gas industry standards and customer specifications.

Materials of Construction

L&T Valves manufactures a comprehensive range of Double Block & Bleed (DBB) Plug Valves in sizes up to 30" (750 mm), and in ASME classes from 150 to 600. The valves are offered in a combination of materials and actuation options to suit customer requirements. The highly reliable valve has successfully completed over 10,000 cycles at its rated pressure.

Double Block & Bleed Plug Valve provides online-verifiable bubble tight sealing and is a safe and reliable replacement to the conventional two-valve system. In this valve, high integrity positive shut-off is obtained mechanically, independent of line pressure, without sealants/ lubricants. Globally, the valve has emerged as the industry standard for movement and storage of petroleum products in refineries, petrochemical plants pipelines, tank farms and terminals.

In-house Test Facilities

1. Antistatic Test

2. Drive-train Strength Test

3. Endurance Test

4. Fire Test

5. Fugitive Emission Test

6. Torque Test

The quality management system has been certified to comply with

1. ISO 9001: 2008

2. API Spec Q1

Established processes control all stages of manufacture to ensure quality consistent with international standards and customer requirements. A world-class manufacturing and QA infrastructure guarantees that each DBB Plug Valve delivers reliable performance. Dimensional accuracy and consistency are obtained using CNC and Special Purpose Machines. International health, safety and environment standards govern every phase of the manufacturing process. The plants are zero discharge units and are pioneers in green initiatives.

Compliance Standards

DBB Plug Valves are designed in accordance with key international standards. They also meet the requirements of major hydrocarbon industry standards and customer specifications.

Materials of Construction

Double Block & Bleed

At the heart of L&T Plug Valve are two seats energised by a single obturator, and a drain port between the seats. Bubble-tight sealing is obtained when obturator (plug) forces the segments against the body seats. The sealing is independent of line pressure, and is online verifiable, thus making L&T Plug Valve a true API 6D Double Block & Bleed Valve.

Positive Double Isolation

L&T Plug Valve is recommended for critical services that demand double positive isolation since sealing is obtained mechanically independent of line pressure, or sealants/ lubricants.

The valve is fire-safe and complies to API 607 and ISO 10497.

Valve Operator Mechanism

The patented operator mechanism controls the movement of plug and the segments. It enables the segments to move towards the seats to close the valve, and away from the seat during valve operation.

Cavity Relief System

In flammable fluid lines, build-up of pressure inside the valve cavity can trigger accidents. To prevent this occurrence L&T Plug Valves are supplied with an inbuilt cavity pressure relief system.

Inline Maintainable Seats

L&T Plug Valve seats can be renewed without removing the valve from the pipeline. In open position, after the bottom cover is removed, the segments can be retracted from the seat and replaced. Care should be taken to ensure that the line is drained.

Bleed Option

For online verification of seat integrity as well as to drain the body cavity, L&T Plug Valves are supplied with a drain port.

Valve Operation

1. Valve Closed

In the closed position, the plug forces the segments against the body to achieve bubble-tight sealing.

2. Closed to Open - Segments Retracted

When the valve is opened, the plug moves up and causes the segments to retract from the seats.

3. Closed to Open - Friction-free Rotation

Plug rotates from closed to open position without the segments rubbing against the seats. This reduces torque and enhances valve life.

4.Valve Open

The plug port aligns with the body bore to facilitate flow.

HIPPS-High Integrity Pressure Protection System

L&T Valves offers a range of customised SIL-3 capable High Integrity Pressure Protection Systems (HIPPS) for over-pressure protection leveraging our expertise of five decades in flow-control and system integration.

High Integrity Pressure Protection System (HIPPS) is a Safety Instrumented System (SIS), which by definition, is a distinct, reliable system used to safeguard a process to prevent a catastrophic release of toxic, flammable, or explosive chemicals.

In industrial plants, flare systems are primarily used for burning off flammable gases released by pressure relief valves during unplanned over-pressurization of plant equipment. Flaring and venting constitute a significant source of greenhouse gas (GHG) emissions, and the elimination of GHG emissions from flaring in the world would account for at least 10% of total emissions reductions as per the Kyoto protocol.

HIPPS can be employed to prevent over-pressurization of a plant by shutting-off the source of the high pressure gas rather than by releasing it to the atmosphere. This system closes the source of over-pressure within two seconds and has at least the same reliability as a safety relief valve or flare system.

As per ASME Section VIII, UG-140, which covers 'Over-pressure Protection by System Design', HIPPS can be used for the following applications:

1. Chemical reactions so fast the pressure propagation rate could result in loss of containment prior to the relief device opening.

2. Chemical reactions so fast the lowest possible relieving rate yields impractically large vent areas.

3. Exothermic reactions occurring at uncontrollable rates.

4. Plugging, polymerization, or deposition formed during normal operation.

5. Reactive process chemicals relieved into lateral headers with polymerization and thus plugging, rendering the relief device useless.

6. Multi-phase venting, where actual vent rate is difficult to predict.

7. Reducing GHG through regulations such as Kyoto protocol.

Knife Edge Gate Valve

A Knife Gate Valve is an Isolation valve that utilizes a blade to cut through clogging of heavy liquids. These valves were designed to work in some of the most corrosive, erosive and abrasive environments like pulps, slurries, cement clinkers and other viscous fluids.

Piston Valves

Piston valve is a linear movement valve in which a stainless steel piston travels between upward and lower seat ring. Known for their extraordinary performance and long life, Piston valves can handle variety of media such as steam, thermal fluid, condensate and many other liquids and gasses. They can be used in on/off and throttling applications.

PTFE Sleeved Plug Valve

PTEF Sleeved Plug Valves are best choice for tight shut-off isolation services for pump, tanks, reactors, heat exchangers and other critical equipment’s. In-line seal adjustment facilitates routine and emergency maintenance by minimizing costly process shutdown and spare valve inventory.

The IN-line tight shutoff and the positive stem seal makes PTFE Sleeved plug valve and ideal choice throughout the chemical and process industry for emission free control of liquid, gases, vapour and slurries.