GPEC Ltd is the UK representative for Quadax GmbH

GPEC Ltd are proud to announce they are now the exclusive UK representative for müller Quadax GmbH, part of the familyowned müller co-ax group who has established itself in its over 60-year company history as a renowned, globally operating manufacturer of valve technology. This parent company name will likely be familiar with readers of the Valve-User magazine as co-ax valves ltd are also a member of the BVAA.

Quadax, headquartered in Forchtenberg, Germany, are the manufacturer of the quadruple offset butterfly valve – which is a development on the triple offset butterfly valve. In contrast to the elliptical sealing geometry of a TOV, the Quadax valve operates with a completely round seal, allowing them to create a tighter sealing surface with less friction than a typical triple offset butterfly.

This innovation was made possible by an intelligent design principle and access to modern 5-axis machining centres. The Quadax valve was developed and introduced to the market in 2009 as part of the müller co-ax valve range, however, 2017 saw the formation of müller Quadax GmbH as a daughter company and manufacturer in its own right.

Butterfly valves need to meet the highest requirements in terms of tightness and longevity. This is especially true for triple offset butterfly valves used in demanding applications in the oil and gas, refining and petrochemical industries, for example, in LNG and LPG applications extreme pressures and wide temperature ranges mean that excellence in design and metallurgy is essential. A disadvantage of the triple offset design commonly used in this industry is that it is unable to ensure 100% tightness over a period of time.

This is due to thermal variations within material. The different wall thicknesses lead to uneven spreading of the material on the seat – a problem that is rendered obsolete with the quadruple offset design. The perfectly rounded sealing geometry of this construction with all-round identical material thickness guarantees bubble-free tightness in cryogenic applications (down to -196°C) or those involving extreme temperature fluctuations. The valve has proved successful in extreme temperatures from -270°C to +800°C.

The principle of the quadruple offset butterfly valve offers several important advantages over other designs. Because the valve is friction-free and involves no wear on the seat, the risk of failure is greatly reduced while simultaneously extending the service life. In addition, the high KV value allows a smaller dimensioning of the nominal pipe diameter. The valve is Fire Safe in both directions in accordance with ISO10497, API 607 and BS6755 as well as meeting the following safety certificates 2014/34/ EU – ATEX-guideline, SIL3, ISO 15848-1 / TA Luft. In terms of tightness Quadax achieve leakage rate A according to: DIN EN 12266 / ANSI Class VI and better than BS 6364, bubble tight in cryogenics. All this makes it the ideal solution for cryogenic applications and for processes with flammable media and explosive atmospheres.

The Quadax valve sizes range from 2″ – 72″ with pressure class up to #1500. The valve is available in different end-connections and face to faces such as lug/wafer, buttweld, double flange, gate valve replacement (double flange long pattern) and top entry welded. Interestingly, they are stocking 2″ – 24″ #150 and #300 Stainless steel and Carbon steel bodies for quick delivery (2 - 4 weeks) and are building a strong reference list across Refining, Steam, LNG, LPG, Cryogenic gases and severe service applications. For more information please contact Sean Gower at GPEC or visit us at

Tel: 01942 356 653

Published in Valve User Magazine Issue 51

Summer 2020 // Issue 53
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