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A valve regulates, directs or controls the flow of fluids or gases by opening, closing or partially obstructing various passageways.

Valves are widely used in the oil and gas industry for sea floor, land, on- and offshore applications. Valves are made in various sizes and materials.

Facts and component characteristics​



Forged, cast and solid billets​

  • Austenitic stainless steel 410, CMC = 06.32
  • Steel 4130, 4140
  • Steel with cladded Inconel 625 inlay
  • Solid Inconel 625 and 718
  • Super duplex and duplex
  • Variety of sizes
  • Varied batch production: 1 to ~300
  • Gate valves are typically pre-forged
  • High demands on tolerance
  • Typical surface finish demands of Ra = 1.6 μm (62.99 μin)


1. ​Cavity bore

Machining challenges
  • Interrupted cut (cross hole)
  • ​Chip evacuation (turning)
  • Low cutting data
  • Short and unpredictable tool life
  • Long overhang
  • Unsecured process
  • Close tolerances (finishing)
  • Fixturing


The Sandvik ​Coromant solution:

Operation 1: Roughing from solid material

Operation 2: Semi-finishing of cladded layer

Operation 3: Finishing of cladded material

Semi-finishing with multi-edge solution CoroBore® BR30
  • Eight cutting edges
  • ​Cartridge solution for adjustability of diameters up to a diameter of 10 mm (0.394 in)
  • 84° entering angle
  • Insert: SPMT 1210-BM
  • Grade: GC1145
  • Higher metal removal rate thanks to the multi-edge solution
  • Predictable process and tool life:
    • New grade GC​1145 provides improved wear resistance
    • New geometry for improved chip control in gummy materials
    • Lead angles improving cutting edge action (reduced chip thickness)
  • Possibility to optimize the number of edges in order to reduce cutting forces in deep cavities and long overhangs
  • Designed with a differential pitch to reduce vibration

Helical interpolation

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Customer values

  • Highly effective process with helical interpolation
  • Overcome problems with tool breakage and short tool life
  • Short cycle time

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2. ​Valve seat pocket

Main machining challenges
  • Cladded Inconel: high tensile strength at high temperatures
  • High tolerance and surface demands
  • Vibration
  • Interrupted cut
  • Long overhang
  • Difficult fixturing
  • Need for optimized F1-dimensions


The Sandvik Coromant solution:

Utilize a back-facing operation with Silent Tools™​ adapters and CoroTurn® SL modular system along with CoroTurn® SL heads in order to achieve a wide range of F1-dimensions.

The optimized adapter allows for a longer reach and precise and stable machining of the seat pocket feature.

  • Good surface finish
  • Increased tool life
  • Secure process

Read more



Customer values

  • Good surface finish
  • Increased tool life
  • Secure process

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3. Bolt h​oles

Main challenges
  • Cost per hole
  • Hole and thread quality
  • Green Light Machining:
    • Predictable process
    • Chip evacuation
The Sandvik Coromant solution

Secured automation:

Secure thread production:



Customer values

  • High productivity
  • Secure process
  • ​Consistent hole diameter​

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4. ​Seal ring grooves

SpiroGrooving™ is a revolutionary solution for secure and productive machining of seal ring grooves on non-rotating components. The solution manufactures API standard grooves and provides close hole tolerances and a fine surface finish. It is based on standard tools and dedicated SpiroGrooving™​ software, for an optimized result.

  • Assembly kits allow you to precisely set height and diameter
  • ​Slides are interchangeable with previous SpiroGrooving™ kits, for flexibility
  • Unique machining method and SpiroGrooving™ calculator for NC-code generation


The SpiroGrooving™​ formula

CoroBore® XL  Spirograph​  Helical interpolation in a taper​  API seal ring grooves​
More about SpiroGrooving​™

SpiroGrooving™ white paper​

Article in MWW

Handling instruc​tions​

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