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manufacturer of industrial valves

Three-way butt weld end ball valve with stuffing box KM 9303.X-01-03.2

Products >> Floating ball valves >> Three-way and four-way

DN 10 – DN 150, PN 16 – PN 250

EN standard, full bore, 2 seats


Three-way butt weld end ball valves type KM 9303.X-01–03.2 are isolating valves designed either to redirect or to 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, oxygen, and generally for both corrosive and non-corrosive liquids and gases without mechanical impurities. Unlike common ball valves, these are sealed with Graphite and are used in applications where rubber rings do not have sufficient chemical resistance to the fluid. Service temperature range can be from −60°C to +230°C depending on body material. Allowable service pressures are in compliance with the pressure-temperature ratings (graphs B1, S1, S2, S4).

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).

The ball bore may have the form of either “L” or “T”. The position of the ball in the ball valve is shown by the mark on the upper flat of the stem. The ball valve is equipped with two seats for ball sealing, the middle connecting pipe is without a seat. The pressure fluid may be brought to the middle connection only, the end connections are outlet connections. The flow possibilities are shown on the schemes, other possibilities can be discussed by phone.

Flow directions


  • 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 9333.X-01–03.2).

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.

Prior to welding it is necessary to fully open the ball valve. The welding sockets must not be removed from the body.

Optional accessories, adjustments and services

  • 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
  • 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
  • execution according to API standards

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