B1.5 Series

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B1.5 Series:  The small choke with the big flow

With semimodular design for quick trim changes and the same state of the art materials as BST's B1 series, the B1.5 offers a larger flow area (1" = 1.77 in2) than any other choke in its class.  Double, self-energized PTFE seals create a bubble tight seal at the stem, ensuring long life and smooth hand operation, even after years of rugged use.  You can't buy a better choke, because BST makes it rugged - but simple - for your safety and ease of operation.


  EZ-VU handle allows 64th indications to be viewed from any angle aaround the choke.  Handy T-Bar handle is optional.

  Easily tuned for precise adjustment and control.

  Can be locked in the adjusted position.

  Double, self-energized PTFE stem seals and Viton O-rings standard (Aflas O-rings optional).

  All internal control surfaces constructed of 17-4 PH stainless steel.

  Easy, safe access to internal parts without removing the body from the line.

  Available in a wide variety of end connections (buttweld, socketweld, threaded NPT/LP, API 6B or ANSI B16.5 flanges) and sizes (2" and 3").

  Standard trim size is 1" (1" and 1" also available); standard material is 17-4 PH stainless steel (tungsten carbide available).

  Standard 4130 alloy steel body and bonnet rated to 5,000 psi working pressure.

  Angle body (shown above) is standard.  Through style body is optional.

  Corrosion resistant alloys optional.

  Standard temperature range:  -20F to +400F.

  Special high temperature versions optional:  B1.5HT (-20F to +500F) and B1.5HTG (-150F to +800F).

  Contact BST Engineering for standard centerline to flange face dimensions.

  Designed and manufactured in compliance with API Spec 6A.

  Suitable for NACE MR-01-75 applications.


  To calculate liquid flow through a B1.5 choke, click here.

  To calculate gas flow through a B1.5 choke, click here.



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Copyright 2013 BST Lift Systems Inc.
Last modified: January 07, 2020

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