Small enough to be flexible, big enough to solve your problem

+31 (0) 180 46 34 71
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Valve parts

With several major players in the valve industry as a customer and over 25 years of knowledge and experience, we may call ourselves a specialist in the production of valve parts. Our valve parts can be found in the maritime, offshore and chemical industries. But also, for example, in transport and transshipment, in particular for liquid transport and LNG transport.

Valve parts specialist

Our extensive machinery is equipped with all the right tools for every solution. This enables us to not only machine plastics, like PCTFE for cryogenic applications, PEEK and Polyimides, but also carbon graphite which we lathe into seats, bearing bushes or sealing rings. Metals like stainless steel, titanium, nickel aluminium bronze, Hastelloy and Duplex can also be machined to manufacture retainers and rings. We also fit metal retainers with fluoroplastics, moulded graphite and/or hard graphite seals to form seat assemblies.

Seat assembly: our specialty

Thanks to our years of experience, also of shrinkage and expansion of the different materials, fitting all loose parts into a seat assembly has become one of our specialties. In our machine shop, we have specialists for turning metals, carbon graphite and plastics. Machining plastics or carbon graphite are very different specialisms than machining metals. Every plastic or graphite behaves differently under external factors such as temperature and humidity. We guarantee a high level of accuracy in all turning and milling. Depending on the material, we can work to tolerances up to 0.05 mm.

Custom-made valve parts

At Ridderflex you can have valve parts produced according to your own specifications. This can easily be done on the basis of a drawing or model. We supply the following parts for the valve industry:

  • Seat cage
  • Seat gasket
  • Seat/front seal/seat insert
  • Seat retainer/seat holder
  • Spiral wound gasket
  • Stem bearing/bushing
  • Stem packing/seal
  • Stem thrust bearing
  • Stem tip
  • Trunnion bearing
  • Thrust washer

Are you curious whether we can also make your custom-made valve part? Or do you want to make an enquiry? Please call +31 (0) 180 46 34 71 or e-mail to

More about our valve parts

  • Ball valve seat assy: the summit of custom-made

    Ball valve seat assy: the summit of custom-made

    25-10-2018 The summit of a custom-made product is our ball valve seat assembly. We compile this seat assy of multiple parts of different materials. Often metals are combined with graphite (hard or soft) and plastics.

  • Ball valve parts

    Ball valve parts

    Ridderflex supplies a.o. chevron sets, seat assemblies, spiral wound gaskets, back-up rings and o-rings to the ball valve industry.

  • Chevron set

    Chevron set

    Multi-part and custom-made sealing set. Composed of top rings, middle rings and bottom rings. Supplied in PTFE, PTFE glass (15% or 25%), PTFE carbon or PEEK.


ISO including co-engineering

Ridderflex complies with international quality management requirements. We are now also certified for co-engineering – our strength – . Read more


Any questions about products or make an enquiry? Simply call us or send us an e-mail. +31 (0) 180 46 34 71