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Ball valve parts

We are specialists in the production of ball valve parts and are known for our ball valve seat assemblies: the absolute summit of a custom-made product. We compile this seat assy from multiple parts of different materials.

Our ball valve parts are used in the marine, offshore and chemical industries, as well as in transport and transshipment (specially for liquid transport and LNG transport) and other sectors.

Ball valve parts according to your specifications

Our extensive machinery is equipped with all the right tools for every solution. We produce ball valve parts according to your specifications. This can easily be done on the basis of a drawing or model. The table below provides an overview of the ball valve parts that we produce to measure.

  • Stem bushing
  • Stem packing
  • Stem seal
  • Stem thrust bearing
  • Thrust washer
  • Trunnion bearing

Ball valve seat assy

Our seat assembly always consists of multiple parts in different materials. Thanks to our years of experience, also of shrinkage and expansion of the different materials, fitting different parts into a seat assembly has become one of our specialties. Often metals are combined with graphite (hard or soft) and plastics. A seat assy is assembled in the following way:

  • Ball valve seat (front seal / retainer)
  • Ball valve retainer (zittinghouder)
  • Ball valve seal (rear seal)
  • Possible addition: o-ring or backup ring

Machining plastics or carbon graphite are very different specialisms than machining metals. Every plastic or graphite behaves differently under external factors. We machine all parts of the seat assy in-house. In our machine shop, we have specialists for turning metals, carbon graphite and plastics.

Are you interested in our products or would you like to make an enquiry? Please contact us!

Ball valve parts related

  • Turning


    Ridderflex machines all kinds of plastics. And, where required, we can also turn rubber and metal. We have extensive machinery with CNC, conventional and automatic lathes.

  • 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.

  • Custom-made Kalrez ® o-rings (FFKM)

    Custom-made Kalrez ® o-rings (FFKM)

    We supply Kalrez ® o-rings with a quality guarantee. If desired with a certificate. In any desired dimension.


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