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manufacturer of industrial valves

Ball valve, metal-to-metal, with springs and floating seats KM 910X.X-MF5

Products >> Floating ball valves >> Metal seated

DN 25 – DN 100, PN 16 – 160

EN standard, full bore


Ball valves with butt-weld ends type KM 9103.X-MF5(-FW-MF5), and with flanged ends type KM 9108.X-MF5 (-FW-MF5) 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 table of materials. By agreement and based on service conditions, also other materials than those specified in the table may be used.

The ball valves are intended to be used with fluids containing mechanical particles with sizes not exceeding 5mm, especially heating gases (natural gas, lighting gas, propane-butane mixture, biogas, coke-oven gas), water, and non-corrosive liquids and gases in general. The permissible hardness of mechanical impurities depends on the material of the ball valve seat. For hardened stainless material 1.4034 (M5), ČSN 17 029 (M5) or for Stellite (MS) overlay, the solid particles can be very hard (up to hardness Mohs 7, e.g. sand, etc.).

Service temperature range can be from −46°C to +200°C depending on combination of body material and sealing rings. Allowable service pressures are in compliance with the pressure-temperature ratings (graph B1).

Technical Description

Ball valve design meets the requirements of API 608 and API Spec 6D. The ball valve is with full bore, floating ball and floating seats, 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). Sealing between the ball and valve seats is ensured by metal-to-metal contact. The cover is attached to the body by bolts or screwed and secured by a seal weld (FW design).


  • 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-MF5).

Connection to Piping

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

  • dimension of ball bore according to API 6D or API 608
  • connection according to EN 1092–1 or ANSI B 16.5
  • face-to-face dimensions of type KM 9108.X-MF5 – series 1 according to EN 558–1 (DIN 3202 series F1)
  • shapes of welding ends according to EN 17292
  • end-to-end dimension of type KM 9103.X-MF5 – according to EN 12982


According to EN 12 266–1 as a standard, i.e. shell strength test P10, P11, seat tightness test P12 (water pressure 1,1×PN and air pressure 0,6 MPa), leakage rate A – 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.

When welding the ball valves type KM 9103.X-MF5 into the pipeline, the following procedure must be followed:

  1. prior to welding, open the ball valve fully
  2. do not release and do not remove the sockets from the body!
  3. use a welding procedure with which the temperature around rubber O-rings and seats in the body does not exceed 120 °C. It is possible to limit the temperature, for instance, with a heat absorbing paste.

In case of testing of piping with water it is recommended to drain the water from valve's hollow with the plug (Pos. 12) after completion of the tests.

Optional Accessories, Adjustments and Services

  • heating jacket – for keeping the fluid liquid
  • different face-to-face dimensions or end combinations
  • adaptation of face form (Groove, Tongue, Spigot, Recess, O-ring groove, RTJ)
  • 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
  • up-stream vent hole – for balancing pressure into up-stream pipeline
  • limit switches
  • bypass valve
  • double block and bleed (DBB)
  • double piston effect (DPE)
  • documentation according to EN 10204 3.1 or 3.2
  • special adjustments according to customer requests
  • valves for nominal pressure classes PN 160
  • execution according to standard NACE MR 0175 or ISO 15156

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