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Válvula

Valve

Las válvulas se encuentran en prácticamente todos los procesos industriales, incluido el tratamiento de agua y aguas residuales, la minería, la generación de energía, el procesamiento de petróleo, gas y petróleo, la fabricación de alimentos, la industria química y del plástico, y muchos otros campos.
Las personas en países desarrollados utilizan válvulas en su vida diaria, como las válvulas de fontanería —grifos de agua potable, válvulas de control de gas en cocinas—, pequeñas válvulas integradas en lavadoras y lavavajillas, dispositivos de seguridad en sistemas de agua caliente y válvulas de émbolo en motores de automóviles.
También existen válvulas en la naturaleza: por ejemplo, las válvulas unidireccionales en las venas que controlan la circulación sanguínea, y las válvulas cardíacas que regulan el flujo de sangre en las cavidades del corazón y mantienen la acción de bombeo correcta.
Las válvulas pueden accionarse manualmente, mediante manija, palanca, pedal o volante. También pueden ser automáticas, accionadas por cambios de presión, temperatura o caudal. Estas variaciones actúan sobre un diafragma o un pistón que a su vez activa la válvula. Ejemplos habituales de este tipo son las válvulas de seguridad instaladas en sistemas de agua caliente o calderas.
Los sistemas de control más complejos que requieren regulación automática basada en una señal externa —es decir, ajustar el caudal de una tubería a un punto de ajuste variable— necesitan un actuador. El actuador desplaza la válvula según su señal y configuración, permitiendo un posicionamiento preciso y el control de diversos requisitos.
Variedades
Las válvulas varían ampliamente en forma y aplicación. Los tamaños suelen oscilar entre 0,1 mm y 60 cm. Las válvulas especiales pueden alcanzar diámetros superiores a 5 metros.
Sus costos van desde sencillas y económicas válvulas desechables hasta modelos especializados que cuestan miles de dólares por pulgada de diámetro.
Las válvulas desechables se encuentran en artículos domésticos comunes, como dosificadores de bomba pequeña y aerosoles.
Un uso habitual del término «válvula» se refiere a las válvulas de émbolo presentes en la gran mayoría de los motores de combustión interna modernos —como los de la mayoría de vehículos de combustible fósil—, que controlan la entrada de la mezcla aire-combustible y permiten la salida de gases de escape.
Rubber expansion joints
Brand

LUOYING

Rubber expansion joints
Size

DN15-DN1200

Rubber expansion joints
Temp

Rubber expansion joints
Pressure

16 bar

Product Range

Customized Products

  • Rubber expansion joints
  • Rubber expansion joints
  • Rubber expansion joints
  • Rubber expansion joints
  • Rubber expansion joints
  • Rubber expansion joints

Technical Notes

Manufacturing of rubber expansion joints

Rubber expansion joints

 

Wrapping fabric reinforced rubber sheets

Rubber expansion joints are mainly manufactured by manual wrapping of rubber sheets and fabric reinforced rubber sheets around a bellows-shaped product mandrel. Besides rubber and fabric, reinforced rubber and/or steel wires or metal rings are added for additional reinforcement. After the entire product is built up on the mandrel, it is covered with a winding of (nylon) peel ply to pressurize all layers together. Because of the labor-intensive production process, a large part of the production has moved to eastern Europe and Asian countries.

 

Molded rubber expansion joints

Some types of rubber expansion joints are made with a molding process. Typical joints that are molded are medium-sized expansion joints with bead rings, which are produced in large quantities. These rubber expansion joints are manufactured on a cylindrical mandrel, which is wrapped with bias cut fabric ply. At the end the bead rings are positioned and the end sections are folded inwards over the bead rings. This part is finally placed in a mold and molded into shape and vulcanized. This is a highly automated solution for large quantities of the same type of joint.

 

Automated winding of rubber expansion joints

New technology has been developed to wind rubber and reinforcement layers on the (cylindrical or bellows-shaped) mandrel automatically using industrial robots instead of manual wrapping. This is fast and accurate and provides repeatable high quality. Another aspect of using industrial robots for the production of rubber expansion joints is the possibility to apply an individual reinforcement layer instead of using pre-woven fabric. The fabric reinforcement is pre-woven and cut at the preferred bias angle. With individual reinforcement it is possible to add more or less fiber material at different sections of the product by changing the fiber angles over the length of the product.

Advantage

Nsure that the hose meets the published levels.

dimensions

Economy of minimal face-to-face dimensions

Lightweight

Lightweight construction requires no special handling equipment

Reduced

Reduced fatigue factor and reduced heat loss

Greater

Greater recovery from movement

Installation

Ease of Installation and small space requirements

Insulates

Insulates against the transfer of noise and vibration

Expansion joint accessories

Quality decides value
Rubber expansion joints

Flange

Piping components can be bolted together between flanges. Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels. A cover plate can be connected to create a "blind flange" Flanges are joined by bolting, and sealing is often completed with the use of gaskets or other methods. Mechanical means to mitigate effects of leaks, like spray guards or specific spray flanges, may be included. Industries where flammable, volatile, toxic or corrosive substances are being processed have greater need of special protection at flanged connections. Flange guards can provide that added level of protection to ensure safety.

Rubber expansion joints

Covers

Fasteners are used for fastening and securing materials such as wood, metal, plastic, or concrete. They include nuts and bolts, threaded rods, structural bolts, machine screws, wedge anchors, washers, rivets, and more in a variety of types and sizes, including metric and inch.

Rubber expansion joints

Particulate barriers/purge connectors

In systems that have a media with significant particulate content (i.e. flash or catalyst), a barrier of ceramic fiber can be utilized to prevent corrosion and restricted bellows flexibility resulting from the accumulation of the particulate. Purge connectors may also be utilized to perform this same function. Internal liners must also be included in the design if the expansion joint includes purge connectors or particulate barriers.

Rubber expansion joints

Liners

A gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. It is a deformable material that is used to create a static seal and maintain that seal under various operating conditions in a mechanical assembly.