Gasport GB

Butterfly damper valves

Butterfly damper valve solution for industrial air and gas applications even at very high temperatures.

Gasport GB Butterfly damper valves
At paravalves, every development has in-house engineering and manufacturing facilities for a wide range of industrial applications anywhere in the world.
We work from the delivery and dedication, from the person. Always open to any need, project, industry and customer. With the proactivity and intelligence necessary to face any challenge proposed to us. An engineering and manufacturing team that goes hand in hand with the customer, to always offer a reliable product, with high performance and durability.
Our Gasport GB Type butterfly damper valves are clasified as following, depending on maximum working temperature and design:

Beyond the valve

Butterfly dampers are made as a welded assembly construction and usually made for on/off or modulating gas applications. The installation of this equipment is done between pipeline flanges, which flange drilling can be made according to customer specifications or paravalves standard. Face to face determines the distance between flanges and this can also be taylor-made to comply with customer project. Generally these equipments are installed in a horizontal shaft-line position, but vertical assemblies are also possible with our damper valves. Wafer type or ButtWelding ends can also be supplied on request.

Our engineered BUTTERFLY DAMPER VALVES are made to work in both flow directions as a bidirectional design. The seat can be done as a swing-through disc without seat or the disc can directly make contact with a metal plate ensuring a maximum leak of 0.5%Kv value. Soft braided sealing option can also be supplied on request, providing a more tightness damper closing.

For applications where a full 100% tightening is requested, an air sealing system with double parallel disc design can be made. For such cases, the seal is done in the space between both discs while injecting air at a higher pressure than the one in the conduit. This system creates a pressurized chamber preventing gases from escaping.

Up to
In all sizes
0.5 bar/7.4 psi
Up to

Customized valves

We design and manufacture customized solutions for each customer and need.

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Computational Fluid Dynamics

Non-conformist spirit that makes our engineering team go beyond.

At paravalves, Engineering team is able to perform Computational Fluid Dynamics (CFD) as well as Finite Element Analysis (FEA) for valve components and assemblies.

Every component is designed and validated by top-notch softwares by the paravalves engineering team.

Flow Characteristic Curve

Obtained by paravalves after several CFD studies

The equal percentage characteristic valve inherent curve is ussually selected for control applications because it compoensates effectively the decreasing pressure differentials as flow rate increases.

Seat configurations

Made to fit all range of applications

The wide range of seats available for our Gasport GB range allows us to cater for a wide range of applications, covering everything from the simplest to those requiring zero leakage.

Zero atmospheric leakage.

Even for gas or high temperature applications.

At paravalves Gasport GB butterfly damper shaft packing system is designed to ensure full tightness to the atmosphere even for gas or high temperature applications.

One design to rule them all.

Lever or gearbox manual operation, Electric actuator and single or double Pneumatic cylinder actuation types are possible with Gasport GB butterfly damper valves. The design allows actuators to be interchangeable each other even without removing the valve from the pipeline. It most cases, drilled according to ISO 5211 standard.

Electric Bernard

Electric Bernard







Main features

Working pressures up to 0.5 bar.

Different End connection types can be selected as wafer or butt welding ends.

Tailor-made solutions.

Epoxy coating for carbon steel components.

Sizes up to DN2000.

AIR SEALING option can be done to provide a 100% tightness of the damper.

On/Off or Modulating service.

ISO 5211 drillings for interchangeable actuators.

Pneumatic, Electric or manual actuation.

Working temperatures up to 1100ºC.

Flange drillings to most standards.

Special materials or treatments on request.

Robust and reliable design.

Related industries

Over time, PARAVALVES team has had the chance to analyze not only the design of these valves but the specific applications they are used in as well in a cost effectiveness mind. From Biogas to Petrochemical applications, we’re confident the PARAVALVES Gasport Series Damper valves will be a great solution for the following industries:


Can we help you with anything?

If you need a quotation for any of our products, have any questions, suggestions or want to distribute our valves, we will be more than happy to answer you.