Versatile Design : It can have either 3 or 4 pathways, depending on the system’s needs. Multi-Port Design : Multiple pathways for different flow combinations with a single or double tapered plug. Fewer Valves : It reduces the number of valves and connection points you need in your system, which can make everything run smoother and with fewer parts. Sealing Options Resilient Seated Plugs : Provide a tight seal, operated with either a lever or double handwheel. All-Metal Plugs : Ideal for higher temperature situations where a tight seal isn’t needed.

Double Eccentric Butterfly Valve

Trusted Double Eccentric Butterfly Valve Manufacturer

NTVAL provides Double Eccentric Butterfly Valves designed for precision and durability in high-performance systems. Built to reduce wear and extend service life, our valves ensure consistent performance, making them ideal for critical applications that demand reliability and efficiency.

Reliable Double Eccentric Butterfly Valve

Control de calidad

The PMI test checks the material composition of the double eccentric butterfly valve, verifying it matches the required design for safe use.

Prueba PMI

The sealing test examines how well the valve can completely close, preventing leaks and maintaining effective flow control under pressure.

Prueba de estanquidad

The low emission test evaluates any potential leakage, reducing the release of harmful gases or liquids into the environment.

Prueba de bajas emisiones

The impact test checks the valve’s ability to handle sudden force or stress without breaking, providing durability in demanding conditions.

Prueba de impacto

The dimension inspection measures the valve’s parts, making sure every component fits accurately for smooth operation and reliability.

Inspección dimensional

The painting thickness test verifies the coating’s thickness, providing protection against corrosion and environmental wear, extending the valve’s lifespan.

Prueba de espesor de pintura

PT, or penetrant testing, identifies tiny cracks or surface flaws in the valve, highlighting areas that need repair or improvement.

PT

The material inspection reviews the strength and quality of the raw materials used, confirming their ability to withstand pressure and temperature.

Inspección de materiales

Aplicaciones de nuestras válvulas en sectores clave

Descubra cómo nuestras avanzadas soluciones de válvulas mejoran el control del flujo, ofreciendo mayor eficacia, seguridad y una estricta garantía de calidad.

Double eccentric butterfly valves handle corrosive chemicals with ease, offering dependable flow control in environments where safety is essential.

Procesado químico

In the petrochemical industry, these valves manage the flow of oil and gas efficiently, performing well in high-pressure and high-temperature situations.

Gasolina Química

These valves are vital in nuclear and power generation systems due to their ability to withstand extreme temperatures and heavy-duty operational conditions.

O.P.G & Nuclear

Double eccentric butterfly valves excel in the pulp industry, as they effectively control the flow of thick and abrasive fluids like slurry.

Pulp

Mining operations rely on these valves for their ability to handle abrasive materials, maintaining high performance in demanding environments.

Minería

In water and sewage systems, double eccentric butterfly valves offer reliable control over large volumes of water, contributing to effective operations.

Agua y alcantarillado

These valves regulate steam flow precisely, making them a practical choice for managing pressure and temperature in large steam distribution networks.

Sistema de vapor

In boiling systems, double eccentric butterfly valves provide safe and consistent control over steam and hot water flow, providing efficient heat management.

Sistema de ebullición

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Description

Bi-Directional, Drop-Tight Shut-Off

NTVAL polymer and elastomer seats offer bi-directional, drop-tight sealing in both vacuum conditions and at full-rated differential pressure. The valve’s unique design achieves a secure seal without relying on pressure assistance.

Blow-Out Resistant Shaft

All valves come standard with a blow-out resistant shaft, enhancing safety.

Versatile Packing Design

The unique packing design allows the valve to operate effectively in both pressure and vacuum conditions without requiring modifications or special assembly.

Enhanced Disc and Shaft Connection

The disc taper pins are tangentially positioned, with half embedded in the disc and half in the shaft. This placement puts the pins in compression rather than shear, significantly reducing the risk of failure.

Rocker-Shaped Gland Bridge

The rocker-shaped gland bridge compensates for uneven adjustment of gland nuts, effectively reducing the likelihood of packing leaks.

Disc Positioning and Seal Life

The integrally cast disc position stop perfectly aligns the disc within the seat, maximizing both seat and seal life.

Extended Neck Design

The extended neck allows for 50 mm (2 inches) of pipeline insulation, accommodating various installation needs.

Direct Actuator Mounting

An integrally cast mounting pad enables the direct mounting of actuators, eliminating the need for additional brackets and couplings.

Optimized Shaft Support

– The flattened body bore at the shaft journal ports positions the shaft bearings closer to the disc, providing maximum shaft support, reducing wear and extending valve life.
Where are Double Eccentric Butterfly Valves Used?

Where are Double Eccentric Butterfly Valves Used?

Double eccentric butterfly valves are commonly used in underground water supply systems as an alternative to gate valves. These valves require a shallower bury depth, making them a more cost-effective option, particularly in larger sizes. In addition to underground installations, double eccentric butterfly valves can also be used in above-ground applications.

Double Eccentric Butterfly Valve, Flanged, CL. 150

Body Design: AWWA C504 short body
Seal Location: On disc
Presión nominal: 150 psi
Shaft Material: SS 431
Gearbox: IP68-rated
Operación: Volante
Position Indicator: Included
Configuration Options: Open Left (OL) or Open Right (OR)

Double Eccentric Butterfly Valve to AWWA C504

Seat Material: Stainless steel
Gearbox: IP68-rated with handwheel operation
Aplicaciones: Designed for drinking water and neutral liquids up to a maximum temperature of 160°F

Double eccentric butterfly valves are engineered for extended service life and easy operation. The disc seal, made from NTVAL’s drinking water-approved EPDM rubber, allows it to return to its original shape effectively. The valve’s durability is enhanced by an NSF-approved epoxy coating and a fully encapsulated shaft/disc connection. These valves are suitable for bi-directional applications.

Features

Product Range

Components

Double Eccentric Butterfly Valve: Basic Overview

Our DEX valve, a double offset butterfly valve, is a high-performance solution designed to address many common issues associated with standard concentric butterfly valves. The term “double eccentric” refers to the valve’s design, where the body seat is offset to the front side of the valve body, and the disc is offset to the front side of the shaft.

Benefits of Using DEX Valves

Double eccentric butterfly valves offer several key advantages:

Leak-Free Design: The double offset design of these valves prevents the disc and seat from making contact when the valve is open. This eliminates the risk of creating a “seat set” or leak path, addressing one of the most common issues with butterfly valves.
No Need for an Exercise Program: DEX valves are designed with bronze bushings and O-ring seals to keep water out of the valve shaft area, preventing the corrosion often caused by plastic sleeves and packing glands. This design allows the valves to remain in the open position without the need for regular operation to break up rust or corrosion.
Versatility: Double eccentric butterfly valves are highly versatile, making them an excellent choice for critical service applications where leak prevention is crucial. These valves are suitable for a wide range of uses, including pump control, air valve isolation, reservoir intake isolation, transmission lines, PRV isolation, and general isolation in plants or distribution systems.
Low Maintenance: DEX valves are designed for durability and ease of maintenance, reducing the overall cost of ownership. They require minimal upkeep and are straightforward to repair if needed.

Main Features

Versatile Design: It can have either 3 or 4 pathways, depending on the system’s needs.
Multi-Port Design: Multiple pathways for different flow combinations with a single or double tapered plug.
Fewer Valves: It reduces the number of valves and connection points you need in your system, which can make everything run smoother and with fewer parts.
Sealing Options
- Resilient Seated Plugs: Provide a tight seal, operated with either a lever or double handwheel.
- All-Metal Plugs: Ideal for higher temperature situations where a tight seal isn’t needed.

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Más información general

Specs of Double Eccentric Butterfly Valve

Construcción material

Double Eccentric Butterfly Valves are constructed from durable materials like stainless steel or ductile iron. These materials provide excellent resistance to corrosion and wear, making them suitable for various industrial applications. The valve’s body are designed to withstand harsh environments and maintain long-term performance. At NTVAL, our choice of materials keeps the valve efficient even under harsh conditions.

Presión nominal

These valves are typically rated for pressures up to 250 PSI, depending on the specific model and size. Did you know that the pressure rating makes them suitable for medium to high-pressure systems in industries like water treatment, oil and gas, and chemical processing. They provide reliable flow control under demanding pressure conditions.

Temperatura

Double Eccentric Butterfly Valves can operate effectively within a temperature range of -20°C to 200°C, depending on the materials used. This wide temperature range allows them to be used in applications involving both hot and cold fluids. They maintain functionality without compromising the integrity of the valve components.

Features of Double Eccentric Butterfly Valve

Double Offset Stem

This valve features an offset stem that reduces friction during operation. This design allows the disc to move away from the seat quickly, minimizing wear and extending the valve's life. And on top of that, the double offset allows the valve to provide a reliable seal with less effort.

Bi-Directional Sealing

The valve's bi-directional sealing capability provides tight shut-off in both flow directions. This feature is particularly beneficial in applications where the flow direction may change, such as in complex piping systems. The advanced sealing technology provides reliability and efficiency in maintaining a secure closure.

Self-Cleaning Seat Design

The seat design in Double Eccentric Butterfly Valves often includes a self-cleaning feature. As the disc moves away from the seat during operation, it helps to clear debris and deposits from the sealing surface. This feature reduces the risk of buildup, maintaining consistent performance and reducing the need for frequent maintenance.

Benefits of Double Eccentric Butterfly Valve

Reduced Leakage

This valve is designed to provide a tight seal, reducing the risk of leakage. The double offset mechanism allows the disc to move away from the seat immediately upon opening, minimizing wear and tear and providing a reliable seal. This is beneficial in applications where fluid loss must be kept to a minimum, promoting efficient operation and reducing maintenance costs.

Lower Operating Costs

The efficient design of Double Eccentric Butterfly Valves reduces the torque required to operate them, leading to lower energy consumption. This, combined with reduced maintenance needs, contributes to lower overall operating costs. The valve's durability also means fewer replacements, adding to long-term cost savings. If you are looking for the best valve that will truly give you this benefit for your business, choose NTVAL.

Long Service Life

The durable construction and design of this valve contribute to their long service life. By minimizing friction and wear through the double eccentric design, these valves experience less mechanical stress over time. This longevity reduces the need for frequent replacements and maintenance, offering cost savings and peace of mind for users.

Applications of Double Eccentric Butterfly Valve

Oleoductos y gasoductos

In the oil and gas industry, Double Eccentric Butterfly Valves from NTVAL are employed to control the flow of crude oil, natural gas, and other fluids. They handle high pressure and temperature variations effectively, making them ideal for pipeline systems. The valves’ durability is essential in these demanding environments.

Power Generation Plants

In power generation plants, these valves are used to control the flow of steam, cooling water, and other fluids. Double Eccentric Butterfly Valves’ ability to handle high-pressure conditions and provide precise flow control is essential for maintaining the efficiency and safety of power generation processes.

Chemical Processing Facilities

Double Eccentric Butterfly Valves play a vital role in chemical processing facilities, where they manage the flow of corrosive and hazardous substances. You won’t believe that their material versatility allows them to withstand aggressive chemicals, while their reliable sealing reduces the risk of leaks. This makes them integral to maintaining safe and efficient operations.

Water and Sewage Treatment Plants

In water and sewage treatment, Double Eccentric Butterfly Valves regulate the flow of large volumes of water and waste fluids. Their ability to resist wear from continuous operation and exposure to impurities makes them perfect for these applications. These valves are also valuable for their low-maintenance requirements, which helps ensure reliable water and waste management.

4 Considerations When Buying Double Eccentric Butterfly Valve

01 1-2 Years Warranty

Look for a Double Eccentric Butterfly Valve that comes with a 1-2 years warranty. A warranty period is important because it provides assurance of the product’s quality and durability. It also offers financial protection, covering repairs or replacements if any issues arise during the warranty period, giving peace of mind. At NTVAL, our general guarantee period is 18 months from the delivery date.

02 Epoxy Coating

Consider a Double Eccentric Butterfly Valve with an epoxy coating, especially if it will be exposed to harsh environments. Epoxy coating is important because it adds a layer of protection against corrosion. Let me widen my point. For example, if your valve is installed in a coastal area where saltwater exposure is common, an epoxy coating will help prevent rust and prolong the valve’s service life.

03 Wafer End Connection

Confirm that the Double Eccentric Butterfly Valve has a wafer end connection, especially if you need a valve that’s easy to install and remove. For example, if your system requires frequent maintenance, a wafer end connection makes accessing the valve quicker and easier to access the valve without needing to disconnect the entire pipeline.

FAQS About Double Eccentric Butterfly Valve

Can you provide Double Eccentric Butterfly Valve test reports and performance data?

Yes, each Double Eccentric Butterfly Valve we provide comes with a complimentary 3.1 certificate. We will send the certificate for your approval prior to delivery.

Is Double Eccentric Butterfly Valve easy to install?

Yes, the Double Eccentric Butterfly Valve is designed for easy installation, with features that allow for straightforward alignment and secure fitting in various piping systems.

What after-sales services does NTVAL offer for Double Eccentric Butterfly Valve?

We offer comprehensive after-sales services for the Double Eccentric Butterfly Valve, including technical support, troubleshooting, and replacement of parts or the entire valve if needed. Repairs or replacements are covered within the warranty period.

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POS.	DESCRIPTION	MATERIAL-STANDARD	0PTIONAL	SPARE PART	WATER CONTACT
1	Cuerpo	EN-GJS-500-7,epoxy coated 250μm	300μm		X
2	Seat area	Integral,epoxy coated	Welded stainless steel AISI 309L		X
3	Disc	EN-GJS-500-7,epoxy coated 250μm	300μm		X
4	Sealing ring	EPDM	NBR	X	X
5	Retaining ring	CF8	CF8M,AISI 316Ti		X
6	Drive shaft	AISI 420	AISI 431,Duplex		X
7	Shaft	AISI 420	AISI 431,Duplex		X
8	Drive side cover	AISI 304
9	End cover	AISI 304
10	Spacer	AISI 304
11	Lavadora	POM
12	Bush	Self-lubricating steel+PTFE coated	Bronze+PTFE coated		X
13	U-ring	NBR		X
14	0-ring	EPDM	NBR	X	X
15	Lavadora	PTFE		X	X
16	Screws	A2
17	Screws	A2			X
18	Set screws	A2
19	Screws	A2
20	Key	C45