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Ball Valves
General Features
KM Series Metal Seated Ball Valves
Extreme operating conditions with temperatures up to 450°C (842°F) and pressures up to 420 bar (6,092 psi) require special sealing technology in ball valves.

Standard soft seated ball valves simply aren't ready for this kind of requirements. Their plastic seals would fail. Metal seated ball valves don't have this problem. However, most metal seated ball valves are not available for high pressures and also not available for smooth operation. AS-Schneider entered the Metal Seated Ball Valve arena with the KM Series.

When developing the KM Series AS-Schneider uses the latest surface and material knowledge combined with comprehensive Engineering know-how. The result is a ball valve with zero leakage even under extreme operating conditions with respect to working pressure and temperature – even though a smooth operation is provided.

Standard Features

  • 2 Piece Design – Fully Welded
  • Ball Bore Size 10 mm (0.39")
  • Seat and Ball Surfaces coated with Hardalloy and Carbide compounds
  • 'Dissolution' Ball Valve Design and an outstanding axial bearing washer at the stem – For smooth operation (even at high working pressures)
  • Double Sealing System in fugitive emission bonnet consisting of premium-quality graphite sealing rings
  • Pressure Rating: Class 2,500
  • Temperature: -29°C (-20°F) to 450°C (842°F)
  • Anti-blowout Stem Design
  • Can be locked in opened and closed position
  • Oval Handle can be dismounted during operation
  • Even Non-wetted Parts are made of 316 Stainless Steel for operation in corrosive environments
  • Seat Leakage: ANSI / FCI 70-2 Class V
  • Body Material: 1.4401 / 316 or 1.0460 / A105
  • Materials comply to NACE MR 0175 / MR0103 / ISO 15156
  • Ball Valve meets requirements of TA-Luft
    (leak rate < 4,6 x 10-6 mbar x l/s)
  • Fire Safe tested acc. to ISO 10497 and API 607
  • Design Basis: ISO 17292, ASME B16.34, MESC SPE 77/170, MESC SPE 77/110
Pressure-Temperature Rating
Innovative 'Dissolution' Ball Valve Design
Large forces are required to preserve the tightness between ball and ball seats and the tightness between ball seats and valve body. These forces are often applied by a screw connector or when assembling the ball valve body (for example a three piece body).

In a conventional design, the transmission of force of the ball seat to valve body sealing is being effected directly by the ball, so as the pressure increases, the actuation torque also rises significantly. The maximum operating pressure of metal seated ball valves from most manufacturers is thus about 100 bar - because that is the limit that still permits actuation of the valve.

With the 'Dissolution' Ball Valve Design, AS-Schneider has introduced an innovative solution. This design, already registered for a patent, offers an optimum distribution of forces and loads in the valve, so they are only present where they are actually needed. The ball valve can thus be actuated without problems even under extreme conditions.
Conventional Ball Valve Design
'Dissolution' Ball Valve Design

The forces required to maintain the tightness are stressing all components - even the ball and seats. The operating torque is thus very high.

 

 

 

 

The forces needed to maintain the tightness between ball seat and valve body are only directed onto the corresponding graphite seal rings. The ball is only spring-loaded, which ensure a low, defined, minimum pressure off the balls on the ball seat. A smooth operation is the consequence.

 

 

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