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manufacturer of industrial valves

Butt weld end ball valve, metal-to-metal KM 9103.X-MD5

Products >> Floating ball valves >> Metal seated

DN 10 – DN 150, PN 16 – PN 160

EN standard, full bore


Butt weld end ball valves type KM 9103.X-01-MD5 (MDS) 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.

The fluids for which the ball valves are designed may contain mechanical impurities – solid particles with sizes not exceeding 0,5 mm. The permissible hardness of mechanical impurities depends on the material of the ball valve seat. For hardened stainless material 1.4034 (MD5), ČSN 17 029 (MD5) or for Stellite (MDS) overlay, the solid particles can be very hard (up to hardness Mohs 7, e.g. sand, etc.).

Technical description

Ball valve design meets the requirements of EN 1983. The ball valve is with floating ball. 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.


  • 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 9133.X-01-MD5).

Connection to piping

Overall dimensions are shown in the datasheet. Dimensions according to standards: shapes of welding ends according to EN 17292 dimension of ball bore according to EN 1983 end-to-end dimension 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-01-MD5 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.

Optional accessories, adjustments and services

  • different dimensions of welding ends or combinations of ends
  • fire-safe design – fire resistance in accordance with EN ISO 10497 (API 607)
  • 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
  • up-stream vent hole – for balancing pressure into up-stream 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
  • execution according to standard NACE MR 0175 or ISO 15156

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