BCST : Fabricant de vannes papillon à triple excentrique sans fuite

When specifying a Triple Offset Butterfly Valve, trust is paramount. Every BCST valve is built to exceed industry standards in our ISO 9001 certified factory. We hold crucial certifications including API 609, API 607 Fire Safe, and CE, guaranteeing our products are suitable for the most demanding services in oil & gas, chemical processing, and power generation. This commitment to certified quality is a core advantage of partnering with BCST.

Des données techniques complètes et des outils interactifs pour vous aider à sélectionner la vanne idéale pour votre application.

Guide de sélection des matériaux

Choisissez le bon matériau pour votre application en fonction de la température, de la pression et de la compatibilité avec les fluides.

Données dimensionnelles

Tableau interactif des données dimensionnelles basé sur les normes GB/T 12221-2005.

DN	Pression	Type de plaquette (mm)	Type de bride (mm)
DN50	PN 1,6~2,5	43	108
DN65	PN 1,6~2,5	46	112
DN80	PN 1,6~2,5	46	114
DN100	PN 1,6~2,5	52	127
DN125	PN 1,6~2,5	56	140
DN150	PN 1,6~2,5	56	140
DN200	PN 1,6~2,5	60	152
DN250	PN 1,6~2,5	68	165

Sélection du type d'entraînement

Choisissez le type d'actionneur approprié en fonction de vos besoins opérationnels.

Normes de fabrication et certifications

Les vannes BCST sont fabriquées conformément aux normes internationales et nationales chinoises.

Selecting a triple offset butterfly valve for high-pressure or high-temperature service is a critical decision. But did you know that choosing the wrong body style can complicate installation, prevent necessary maintenance, and compromise safety?

The main types of triple offset butterfly valves are defined by their body construction: Lug, Wafer, Double Flanged, and Butt-Weld ends. The choice depends on your installation needs, pressure requirements, and whether the valve needs to serve as a dead-end isolation point.

I often discuss this with project engineers like Hassan. He views the valve body as more than just a pressure vessel; it’s a key part of the piping design. He once told me, “Emily, the valve’s performance is sealed by its triple offset geometry, but its function in the system is defined by its body style. Choosing a wafer style when you need end-of-line service is a fundamental design error.

This is because different body types interact with the pipeline flanges in very different ways. The right choice ensures not only a proper seal but also the safety and serviceability of the entire unit for years to come.

Qu'est-ce qu'une vanne papillon à triple excentration de type Lug ?

Are you concerned about needing to perform maintenance on a pipeline without shutting down the entire system? A standard valve might not allow this, forcing a complete and costly outage for a simple repair on one section.

The Lug-type butterfly valve is the solution for this problem. Its body has threaded lugs that allow it to be bolted to one pipe flange at a time. This design allows it to be used for dead-end service, isolating the downstream piping for maintenance.

The key feature of a lug-style valve is the set of threaded inserts, or “lugs,” cast into the valve body. This allows you to connect the valve to each pipe flange with a separate set of bolts. In a standard installation, bolts will pass through both flanges and the valve. But the real advantage comes when you need to isolate a part of the system. You can remove the downstream piping while the valve remains bolted to the upstream flange, holding back the process fluid. This makes it invaluable for applications where regular maintenance is expected.

Hassan frequently specifies lug-style valves for utility connections and equipment tie-ins because they provide a safe and reliable point of isolation without needing a second valve, saving space and cost.

Fonctionnalité	Description
Conception	Le corps de la vanne est doté d'ergots filetés pour le boulonnage.
Installation	Peut être boulonné à chaque bride indépendamment.
Avantage clé	Convient pour les services en cul-de-sac et l'isolation des canalisations.
Utilisation courante	Applications à haute pression ; systèmes nécessitant un entretien fréquent.

Qu'est-ce qu'une vanne papillon à triple excentration de type Wafer ?

Are you looking for a more compact and cost-effective valve for a straightforward isolation task? A heavier or more complex valve might be overkill, taking up unnecessary space and budget in your piping design.

The wafer-type butterfly valve is a compact and lightweight option that is “sandwiched” between two pipe flanges. It relies on long through-bolts that clamp the entire assembly together, making it a simple, space-saving, and economical choice for many applications.

A wafer valve is the essence of simplicity. It has no lugs; instead, it has alignment holes and is held in place by the compression of the flange bolts that extend from one flange to the other, clamping the valve in between. This design makes the valve lighter and often more affordable than a lug-style valve. Because of its slim profile, it is an excellent choice for systems where space is tight.

However, this design has a significant limitation: it cannot be used for dead-end service. If you need to remove the downstream piping, there is nothing to hold the valve in place, and you would need to shut down the entire line. I see these valves used extensively in long, straight pipe runs where isolation for maintenance isn’t a primary concern, such as water distribution or HVAC systems.

Fonctionnalité	Description
Conception	Un corps mince maintenu entre deux brides de tuyau par des boulons traversants.
Installation	“Sandwiched” between pipe flanges.
Avantage clé	Léger, compact et rentable.
Limitation	Ne peut être utilisé pour un service en cul-de-sac.

Quand avez-vous besoin d'un robinet à double bride ou d'un robinet soudé ?

Are you dealing with very large pipe sizes or extremely high pressures where lug and wafer styles may not be suitable? In these critical service conditions, ensuring a robust and secure connection is the highest priority.

For very large diameters or critical, high-pressure applications, double flanged and butt-weld end valves provide the most rigid and secure connection. A double flanged valve bolts independently to each pipe flange, while a butt-weld valve becomes an integral, leak-free part of the pipeline.

These styles are for the most demanding jobs. A double flanged valve has two sets of flanges as part of the valve body itself. Each valve flange is bolted to its corresponding pipe flange with its own set of bolts. This creates an extremely strong and rigid connection, often preferred for very large and heavy valves. It also allows for dead-end service, similar to a lug valve.

Butt-weld end valves take this a step further. These valves have no flanges at all. Instead, the ends of the valve are beveled and are welded directly to the ends of the pipe. This creates a completely leak-proof, continuous connection that is as strong as the pipe itself. Hassan specifies butt-weld valves for the most critical, high-temperature, and high-pressure steam services where zero leakage and maximum structural integrity are non-negotiable.

Style de la carrosserie	Description	Meilleur pour
Double bride	Le robinet possède ses propres brides qui se boulonnent aux brides du tuyau.	Très grands diamètres de tuyaux, applications à haute pression.
Soudure bout à bout	Les extrémités des vannes sont soudées directement à la canalisation.	Applications à haute intégrité, vapeur, exigences de zéro fuite.
Entrée par le haut	Permet d'accéder aux pièces internes de la valve par le haut.	Applications critiques nécessitant une maintenance en ligne.

Conclusion

Le choix du corps de vanne papillon à triple excentration est crucial pour les performances du système. Utilisez le modèle à oreilles pour les services en cul-de-sac, le modèle à galette pour les besoins compacts et rentables, et le modèle à double bride ou à soudure bout à bout pour les applications les plus critiques et à haute pression.