Study on Development of Double Metal-Sealed Gate Valve for the JT-60 Radio Frequency Heating System

M. Minami; Mitsubishi Heavy; H. Morita; Mitsubishi Heavy; T. Nagashima; T. Imai

doi:dx.doi.org/10.13182/FST84-A23230

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Study on Development of Double Metal-Sealed Gate Valve for the JT-60 Radio Frequency Heating System

M. Minami, Mitsubishi Heavy, H. Morita, Mitsubishi Heavy, T. Nagashima, T. Imai

Fusion Science and Technology / Volume 6 / Number 2P2 / September 1984 / Pages 516-521

Technical Paper / Selected papers from the Ninth International Vacuum Congress and the Fifth International Conference on Solid Surfaces (Madrid, Spain, September 26-October 1, 1983) / dx.doi.org/10.13182/FST84-A23230

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The prospect of developing a 750-mm gate valve for the JT-60 radio frequency heating system is discussed. In order to decrease the sealing force applied to the gasket, a sealing system with two H-type gaskets and intermediate vacuum chamber (double seal type design) is planned. Tests for 103 cycles repeated operation at room temperature and 150°C with a full-scale model of the valve seat confirm that valve seat leakage is less than 1.33×10⁻⁹ Pa·m³/s (1×10⁻⁸ Torr · ℓ/s) for helium gas and the sealing force applied to the gasket is less than 9.81×10⁴ N/m (10 kgf/mm).