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manufacturer of industrial valves

ball valve with floating seats KM 9108.X-AP-FB-DBB

Products >> Floating ball valves >> Special

NPS 2″, NPS 3″, NPS 4″, NPS 6″, NPS 8″
Class 150, Class 300, Class 600 (Class 900)


Flanged ball valves type KM 9108.X-AP-FB-DBB 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. The standard materials are specified in the datasheet. By agreement and based on service conditions, also other materials than those specified in the datasheet may be used.

The ball valves are designated for heating gases (e.g. natural gas, lighting gas, propane-butane mixture, biogas, coke-oven gas), water, steam (not exceeding +150°C), oxygen, and generally for both corrosive and non-corrosive liquids and gases without mechanical impurities. Service temperature range can be from −50°C to +200°C depending on combination of body material and sealing rings. Allowable service pressures are in compliance with the pressure-temperature ratings (graphs B2, S8–S10).

Technical description

Ball valve design meets the requirements of API 608 and API Spec 6D. The ball valve is with full bore, floating seats and floating ball, and is fire resistant in accordance with API 607 (fire-safe). 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). A special characteristic of the ball valves is dual tightness of seats (feature „double block and bleed“ and „double piston“). In addition to the downstream seat also the upstream seat ensures tightness thus providing increased long-term reliability of the ball valve. Tightness of the seats can be verified through the plug in the valve body.


  • hand lever
  • hand wheel with worm gear
  • pneumatic actuator
  • electric actuator

Dimensions of flanges for actuator installation are in accordance with ISO 5211. The actuator size depends on the maximum service pressure drop through the ball.

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 9138.X-AP-FB-DBB).

Connection to piping

Overall dimensions are shown in the datasheet. Dimensions according to standards:

  • connection according to ANSI B 16.5
  • dimension of ball bore according to API 608
  • face-to-face dimensions according to ANSI B16.10


According to API 598 or API Spec 6D – zero leakage. Additionally, DBB feature is tested. 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 corresponding to the pressure Class.

Optional accessories, adjustments and services

  • adaptation of face type (Groove, Tongue, Spigot, Recess, O-ring groove, RTJ)
  • heating jacket – for keeping the fluid liquid
  • lockable handle with a padlock – for locking opened / closed position of the valve
  • underground set – for underground service
  • 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 pressure Class 900
  • execution according to standard NACE MR 0175 or ISO 15156

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