• quadax valves inc.
    Quadax Butterfly Valves
    are used in the Refining
    and Petrochemical Industries
  • quadax valves inc.
    Quadax Butterfly Valves
    are used in Power Generation
    and District Heating
  • quadax valves inc.
    Quadax Butterfly Valves
    are used in Specialty Gas
    and Cryogenic Applications
  • quadax valves inc.
    Quadax Butterfly Valves
    are used in the Mining Industries


quadax butterfly valves have no visible leakage when tested at high pressure with water and low pressure with air, according to international test standards.

quadax valves inc.

quadax valves inc., based in Bristol, Pennsylvania, is a subsidiary of co-ax valves inc., and is part of the müller co-ax ag group, a world renowned valve manufacturer since 1960.

For over 50 years, müller co-ax ag has been an innovative leader in the unique design and manufacture of valve technology for businesses worldwide.

In 2009, the müller co-ax group extended their product range with the Quadax® butterfly valve series. With this unique four-offset design and new manufacturing technology, along with an extensive U.S. inventory, quadax valves inc. is able to provide butterfly valves that meet the highest tightness requirements under extreme temperature conditions.

co-ax valves inc. headquarter

Quadax Design Principles

With the new valve series Quadax®, the müller co-ax group is expanding the range of products of valves, especially with larger sizes. The unique design, a quadruple (four offset) design and a new manufacturing technology, Quadax® meets the highest tightness requirements, even under extreme temperature conditions, ranging from -450 °F to +1,500 °F.

Triple Offset comparing Quadruple Offset

Triple offset butterfly valves have been around for years. With definite advantages over rubber lined and double offset valves, they are currently widely used in industry. Offset 1: The valve shaft is offset from the centerline of the valve seat. Offset 2: The valve shaft is offset from the centerline of the pipe. Offset 3: The disc seal shape is manufactured to the shape of a slice from a round cone whose axis is offset from the centerline of the pipe. The shape of the slice is an ellipse.

The Fourth Offset

Quadax® utilizes a patented seal design that results in a sealing surface that is ROUND. The benefits of a round seal are many, giving us significant advantages over triple offset valves. Offset 4: The cone shape is stretched to an ellipse. The disc seal made to the shape of a slice from this elliptical cone, results in a seal that is perfectly round. The cone shape is stretched to an ellipse. The disc seal made to the shape of a slice from this elliptical cone, results in a seal that is perfectly round.

principle triple offset

principle quadruple offset

Features and Benefits

Friction Free

The sealing element does not touch the body seat until it is completely sealed. It doesn’t drag (wear across the body seat).

Higher CV

Because the pipeline is round, and the seat area flow path is round, there is no flow restrictions as seen in triple offset valves.

Low Torque

The Quadax® patented fourth offset design incorporates a disc seal and body seat that are both perfectly round. There is no need for seal ring deformation or rubbing. Because of this unique feature, the required torque is much less; lower torque, smaller actuator, more economical automation.

More Seal Options

The round sealing components of the Quadax® allow us to offer additional sealing options. The Quadax® can use both laminated seals and O-Ring Seals. These O-Ring Seals are unique to Quadax® patented four-offset design.

  • Extreme temperatures, ranging from 450°F to +1472°F
  • Zero leakage, Bi-Directional
  • Superior cryogenic performance
  • Zero rubbing / Zero Friction
  • Extensive U.S. inventory:
    • Sizes 2” to 24” standard stock (up to 60” and above)
    • ANSI classes 150# and 300# standard stock (through 1500#)
    • Body styles lug, double-flanged, gate replacement and buttweld
    • Carbon steel and stainless steel standard stock (special material; duplex, Inconel, bronze)
  • Certifications:
    • ISO 9001:2008
    • Fire Safe (API-607 6th Ed.)
    • SIL3 Certified
    • TA Luft II certified, for fugitive emissions

Quadax Butterfly Valve Body Styles

Buttweld Type Butterfly Valve

  • DIN 3202 F4/S4 face to face
  • buttweld ends
  • available 3" through 40" (other sizes on request)
  • available ANSI 150, 300, 600, or 900 flanged (other pressure classes on request)

Quadax Buttweld Type Butterfly Valve

Data Sheet Buttweld Style

Double Flange Butterfly Valve

  • ISO-5752 face to face
  • short pattern flanged style
  • available 3" through 40" (other sizes on request)
  • available ANSI 150, 300, 600, or 900 flanged (other pressure classes on request)

Quadax Double Flange Butterfly Valve

Data Sheet Double Flange Style

Gate Valve Replacement

  • ANSI B16.10 face to face
  • long pattern flanged style
  • available 3" through 40" (other sizes on request)
  • available ANSI 150, 300, 600, or 900 flanged (other pressure classes on request)

Quadax Gate Valve Replacement

Data Sheet Gate Valve Replacement Style

Lug Type Butterfly Valve

  • API-609
  • lug style
  • available 3" through 40" (other sizes on request)
  • available ANSI 150, 300, or 600 flanged (other pressure classes on request)

Quadax Lug Type Butterfly Valve

Data Sheet Lug Style

Industries Served

The Quadax valve is successfully installed in the following industries: Oil and Gas Processing, Offshore Platforms, Refineries, Hydrocarbon Storage and Transportation, Liquid Natural Gas (LNG) Storage and Transportation, Chemical and Petrochemical Plants, Power Plants, District Heating, Pulp and Paper, Steel Mills, Sugar Mills. Furthermore, Quadax has a long-lasting experience of valves installed on services with the following media: Steam (Saturated and Superheated), Geothermal Steam, Hydrocarbons, Hydrogen, Oxygen, Cryogenic Fluids, Hot Gases, Sulphur (Tail Gas), Chemical Solvents, Chlorinated Solvents and Flare Gas.

Oil & Gas

Industries Served - Oil & Gas

  • upstream
  • downstream
  • pipeline & storage
  • supply & service


Industries Served - Power

  • renewables*
  • fossils
  • district heating
  • nuclear

* solar, geothermal and hydro


Industries Served - Process

  • chemical & coal
  • petrochemical
  • desalination plants
  • waterworks
  • food & beverage

Other Industries

Industries Served - Other Industries

  • iron & steel
  • other mining
  • automotive
  • shipyards
  • aerospace

quadax valves inc. at Valve World Americas

The Valve World Americas Expo & Conference serves as the meeting point for the flow control industry - showcasing the growth in interest by exhibitors and attendees who will experience the technologically in-depth conference program, product showcases on the expo floor and incredible networking opportunities. The annual exhibition welcomes end users, consultants, distributors, manufacturers and suppliers to network, share experiences and check out new products and innovations in the flow control industry.

quadax valves inc. is a regular exhibiting company at the Valve World Americas Expo & Conference. Find more information on Valve World Americas Expo & Conference under www.valveworldexpoamericas.com

Valve World Americas

Quadax Documents

SIL3 Safety Integrity Level DIN EN 61508


All of our data sheets, operating instructions, and certificates are available in PDF-Format. You need the Adobe Reader in order to display them or print them out. If you do not yet have the Adobe Reader installed on your computer, you can download it from www.adobe.com


Quadax Brochure


quadax valves inc. Standard Warranty

Return Goods Procedure and Policy

quadax valves inc. Return Goods Procedure and Policy

Sales Terms and Conditions

Our Sales Terms and Conditions apply to all sales by quadax valves inc. to the purchaser of any and all products manufactured and/or distributed by quadax and to all quotations and offers made by and purchase orders accepted by quadax pursuant to an Order Acknowledgement.

quadax valves inc. Sales Terms and Conditions

Procurement Terms and Conditions

The quadax valves inc. Purchasing Terms and Conditions shall apply to all purchase orders to our vendors for all products or services.

quadax valves inc. Procurement Terms and Conditions

Quadax Contact


  • quadax valves inc.
  • 1518 Grundy’s Lane
  • Bristol
  • PA 19007, USA


Business Office

Contact Form


Quadax Request / Order Details

Order details for actuation

Electric Drive

Pneumatic Actuator

How to find us

quadax valves inc. IS PART OF THE MÜLLER CO-AX GROUP

müller co-ax ag
co-ax valves inc.
quadax valves inc.

Privacy Policy & Legal Notice


  • quadax valves inc.
  • 1518 Grundy’s Lane
  • Bristol
  • PA 19007, USA
  • +1 215-757-5316
  • +1 855-678-2329
  • sales@quadaxvalves.com

Privacy Policy

quadax valves inc. appreciates your interest in our products and your visit to our website www.quadaxvalves.com. At quadax valves inc. we intend to give you maximum control about your personal information. Sometimes however we might need information from your part. Any personal information you will give us including your email address is used in the following way.

If you give us personal information in order to receive the information in return from us - for instance brochures, catalogues - we collect and store that information. That information enables us to fulfill your information request. We do not sell any of the information collected or stored about you.

The web site may contain links to non-quadax valves inc. web sites. quadax valves inc. is not responsible for the privacy practices of such web sites.

Legal Notice

Copyright Notice

The contents of the web site are copyright © 2015 quadax valves inc., 1518 Grundy’s Lane, Bristol, PA 19007, USA. All Rights Reserved. Information on the web site, including but not limited to, text, images and sound, may not be reproduced, transferred, distributed or storaged without prior written permission by quadax valves inc. Modifications to the contents of the web site are expressly prohibited. Some parts of the web site contain images that are subject to the copyright rights of their providers.


Unless otherwise indicated, on the web site displayed marks, corporate logos and emblems, are subject to the trademark rights of quadax valves inc..

No Warranties and Representations

Information on this website is provided "as is". In no event quadax valves inc. will be liable to any party or any direct, indirect, special or other consequential damages for any use of this website, or on any other hyperlinked website, including, without limitation, any lost profits, business interruption, loss of programs or other data on your information handling system or otherwise, even if we are expressly advised of the possibility of such damages.

Legal Effect

This exemption from liability is part of the internet offer. If, because of a legal position change, certain passages of this text or single verbalization lose there validity, even partially, the remaining part of this document will be unaffected. This will apply accordingly, if certain passages of this text or single verbalizations become legally ineffective.

quadax valves inc. makes no warranties and/or representations about any other web site which you may access through this one. Such are provided only as a convenience and does not mean that quadax valves inc. endorses or accepts any responsibility for the contents or the use of such web site. In addition, it is up to you to take precautions and to ensure that whatever you select for your use is free of such items as viruses, worms, Trojan horses and other items of a destructive nature.


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