Valmet’s Neles™ Q-Disc™ flow balancing trim for butterfly valves

New Q-disc™ – Born to perform under pressure.

Valmet’s Neles™ Q-disc™ flow balancing trim is all about reducing noise and taking off some of the pressure directed onto the disc and shaft of a butterfly valve. It is able to do both things with great efficiency and reliability thanks to unique features such as the perforated design and fixed integration onto the disc.

Versatile performance

The Q-disc trim does many things. It helps reduce noise and cavitation like all the other Neles trims under the Q-moniker. But where it really comes into its own is when we discuss alleviating the negative effects of dynamic torque. Dynamic torque is the flow induced pressure torque placed on the valve in active service.

Dynamic torque places considerable stress on the moving parts of a butterfly valve, namely the disc and shaft. It is also a factor that plays a role in the sizing of the valve actuator. Achieving an optimized flow in terms of flow capacity and dynamic torque coefficient can improve the reliability and efficiency of the valve and the overall process it serves as a part of.

Smart design

Instead of a separate trim plate mounted and fixed onto the disk, the Q-disc is seamlessly integrated into the disc design itself. This eliminates any structural weakness that could result in valve failure. Detailed engineering simulations were used early in the design phase and prototyping. The Q-disc proved to give excellent relative flow capacity and flow characteristics very close to those of the standard disc.

The perforated disc design has a positive effect on the valve chocking factor (FL) and is especially good at reducing aerodynamic noise to a certain degree. This stability paired with the durability brought on by the rugged one-piece construction makes for a long-lasting high-performance butterfly valve solution. It has been designed to be easy to install, service and maintain as a part of Valmet’s newest versatile Neles™ Neldisc™ and Jamesbury™ Wafer-Sphere™ butterfly valves.


The Q-disc is going to be a true game-changer. It is a trim solution that has its design roots in the digital world of data and simulations. With every detail of the design meticulously planned out and calculated, we can accurately anticipate the added value it can bring to your process. And obviously, just to make sure, before the commercial launch of the Q-disc we have put it through its paces with stringent testing procedures and a grueling piloting phase. 

Tel No:      +44 (0) 1252 376200




Published: 3rd November 2022

Hot Spot 2023-1230 New Machinery Regulation Enters into Force

What is it? On July 19th 2023 the new EU Machinery Regulation 2023/1230 ...

Share on Twitter Share on LinkedIn Read full article

Comment by BVAA CEO Rob Bartlett

LinkedIn reminded me the other week that I’d reached my 20th anniversary ...

Share on Twitter Share on LinkedIn Read full article

BVAA - Influencing the future of the valve industry

BVAA Technical Services work over much of 2023 has been dominated by two ...

Share on Twitter Share on LinkedIn Read full article

Fresh Approach to Critical Asset Maintenance

The recent planned shutdowns of two major refineries for up to two months has ...

Share on Twitter Share on LinkedIn Read full article

BVAA Annual Meetings & Gala Ball 2023

The BVAA’s biggest annual event is now SOLD OUT! This year, it will take ...

Share on Twitter Share on LinkedIn Read full article

New BVAA Publication: Safety Valves Manual

The NEW Safety Valves Manual is a brand-independent technical publication, ...

Share on Twitter Share on LinkedIn Read full article

ROSS Pneumatrol receives patent for their 2oo3 MRCS

ROSS Pneumatrol is delighted to announce that it has received a patent for ...

Share on Twitter Share on LinkedIn Read full article

MAXIM®  Engineering Software Consultancy Develop Bespoke Engineering Software

MAXIM Engineering Software Consultancy, part of PDL Engineering Group, work ...

Share on Twitter Share on LinkedIn Read full article