Products

Products

Start > Products > Valve
Butterfly Valve Gate Valve Ball Valve Check valve Globe Valve Filter
Ventil

Valve

Ventile sind in praktisch allen industriellen Prozessen zu finden, darunter Wasser- und Abwasseraufbereitung, Bergbau, Energieerzeugung, Aufbereitung von Öl, Gas und Erdöl, Lebensmittelherstellung, chemische und Kunststoffherstellung sowie viele weitere Bereiche.
Menschen in Industrieländern nutzen Ventile täglich, beispielsweise Sanitärventile wie Wasserhähne, Gasregelventile an Kochgeräten, kleine Ventile in Waschmaschinen und Geschirrspülern, Sicherheitsvorrichtungen in Warmwassersystemen sowie Hubventile in Automotoren.
Auch in der Natur existieren Ventile, beispielsweise Einwegventile in den Venen zur Steuerung der Blutzirkulation sowie Herzklappen, die den Blutfluss in den Herzkammern regeln und die korrekte Pumpfunktion aufrechterhalten.
Ventile können manuell bedient werden, etwa über einen Griff, Hebel, Pedal oder Handrad. Sie können auch automatisch arbeiten, angetrieben durch Änderungen von Druck, Temperatur oder Durchfluss. Diese Veränderungen wirken auf eine Membran oder einen Kolben, der wiederum das Ventil aktiviert. Beispiele für solche Ventile sind häufig Sicherheitsventile in Warmwassersystemen oder Kesseln.
Komplexere Steuerungssysteme mit Ventilen, die eine automatische Regelung aufgrund externer Signale erfordern (also die Anpassung des Rohrdurchflusses an veränderliche Sollwerte), brauchen einen Stellantrieb. Ein Stellantrieb betätigt das Ventil je nach Eingangssignal und Einstellung, wodurch eine genaue Positionierung und Steuerung für vielfältige Anforderungen möglich ist.
Varianten
Ventile unterscheiden sich stark in Form und Anwendung. Die Größen reichen typischerweise von 0,1 mm bis 60 cm. Spezialventile können einen Durchmesser von mehr als 5 Metern erreichen. Die Kosten variieren von einfachen, preiswerten Einwegventilen bis hin zu Spezialventilen, die pro Zentimeter Durchmesser mehrere tausend Dollar kosten können.
Einwegventile finden sich in vielen Haushaltsartikeln, wie Minipumpen-Spendern und Aerosoldosen.
Eine häufige Bedeutung des Begriffs „Ventil“ bezieht sich auf Hubventile, die in den meisten modernen Verbrennungsmotoren – etwa in Fahrzeugen mit fossilen Brennstoffen – zur Steuerung der Einlassung des Kraftstoff-Luft-Gemisches und der Auslassung von Abgasen verwendet werden.


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.