QUENCH RELIEF VALVE Page: 1 QUENCH RELIEF VALVE Symposium for the inauguration of the LHC Cryogenics CERN, Geneva, 1 st of June 2007 Speaker: Raphaël COUTURIER.

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Presentation transcript:

QUENCH RELIEF VALVE Page: 1 QUENCH RELIEF VALVE Symposium for the inauguration of the LHC Cryogenics CERN, Geneva, 1 st of June 2007 Speaker: Raphaël COUTURIER (VELAN sas) - Function and Specification - Main features and benefits - Future developments

QUENCH RELIEF VALVE Page: 2 CERN specification & Challenges Superfluid helium service (Temperature: 1.9 K) Set pressure : 17 bar (full open pressure : 20 bar) Remote control actuation (on/off function) Flow coefficient : Kv 30 No risk of icing or jamming when operating Downstream pressure do not affect the set pressure Very low heat inleak Resistant to radiations Valve function Protect against over-pressure the superfluid helium enclosures of superconducting magnet resulting from resistive transitions (Quench) as well as some of the cryogenic lines (QRL).

QUENCH RELIEF VALVE Page: 3 Spring loaded type for high reliability VESPEL plug for radiation resistance Air piston (on/off function) Fiber Glass Stem for low heat inleak

QUENCH RELIEF VALVE Page: 4 Bellows sealed type for better tightness (double bellows type for QV valves) cycles - PN mbar.l/s Balanced to downstream pressure (no influence of the downstream pressure on the set pressure)

QUENCH RELIEF VALVE Page: 5 - Fiber glass stem - Extension with low thickness - Thermal collar HEAT IN LEAK 0.9 W 0.34 W Valves SVC/SVE Valves QV

QUENCH RELIEF VALVE Page: 6 3 types of SRV

QUENCH RELIEF VALVE Page: 7 PERSPECTIVES Technology not limited in terms of flow and Max/Min Set Pressure - JT 60 SA - ITER - TESLA - ILC - K STAR

QUENCH RELIEF VALVE Page: 8 INFORMATION / INQUIRIES VELAN sas 90 rue Challemel Lacour, Lyon, France Contact person: Mr Jean-Luc COLIGNON Tel: VELAN sas (France) : VELAN Inc. (Canada) :