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manufacturer of industrial valves

Double block ball valve KM 91-DBL

Products >> Direct ball valves
Datasheets for download


Double ball valves are isolating valves designed to fully open or close the service fluid flow. They are not designed to be used for throttling or regulating purposes. The scope of application of the ball valves depends directly on their materials and on the properties and temperature of the service fluid.

Production range

  • DN 10 – DN 200, PN 16 – PN 250
  • NPS ⅜″ – NPS 8″, Class 150 – Class 1500

Technical description

Ball valve design meets the requirements of EN 1983, or API 608 and API Spec 6D. The ball valve is with double floating balls in series to ensure tightness. The stem design ensures that the stem can not be ejected from the valve body by pressure of the fluid (anti-blow-out stem), internal components are connected to provide conductivity and resistance to formation of electrostatic discharges (anti-static design).


  • lever
  • gear box with a hand wheel
  • pneumatic actuator
  • electric actuator

Dimensions of flanges for actuator installation are in accordance with ISO 5211.

The method of operation is indicated by the third digit of the type designation, which is „0“ for lever and „3“ for actuator (e.g. KM 913X.X-DBL).

Connection to piping

  • flanged – according to EN 1092–1 or ASME B16.5
  • weld ends – according to EN ISO 17292 or ASME B16.25
  • threaded ends – female / male threads
  • end-to-end dimensions according to EN 558–1 or ANSI B16.10 or according to customer requirement


According to EN 12 266–1 as a standard, or API 598 or API Spec 6D – zero leakage. If required by the Customer, additional tests may be performed as well.

Installation, service and maintenance

The ball valves may be installed into the piping in any arbitrary position. They require no special adjustments or maintenance. They are operable at the full pressure drop which equals to PN.

Optional accessories, adjustments and services

  • different face-to-face dimensions or end combinations
  • fire-safe design – fire resistance in accordance with EN ISO 10497 (API 607)
  • lockable handle with a padlock – for locking opened / closed position of the valve
  • extended stem – e.g. for the reason of insulation of the valve and pipeline
  • limit switches
  • documentation according to EN 10204 3.1 or 3.2
  • special adjustments according to customer requests
  • valves for nominal pressure classes PN 160, 250
  • execution according to standard NACE MR 0175 or ISO 15156

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