F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
62/128
F16K 17/06 (2006.01) F16K 17/04 (2006.01) F25B 9/00 (2006.01) F25B 9/14 (2006.01) F25B 41/04 (2006.01)
Patent
CA 1280001
CRYOGENIC REFRIGERATOR COMPRESSOR WITH EXTERNALLY ADJUSTABLE BY-PASS/RELIEF VALVE Abstract of the Disclosure This invention is comprised of an improved cryogenic refrigeration compressor which contains an externally adjustable relief valve positioned between the helium supply line and the helium return line whereby if the pressure within the helium supply line exceeds a predetermined value the externally adjustable relief valve opens up and allows helium to flow from the supply line to the return line. The relief valve is externally adjustable. It is comprised of a coaxial inlet and outlet member and externally adjustable spring compression means. Together they define a duct. Within the inlet member is a poppet valve and a spring. The spring exerts bias against the valve to close the valve against present fluid pressures. The spring is compressed by rotation of the externally adjustable spring compression means which causes the said spring compression means to project further into the cavity of said inlet member, thus causing the spring to compress further thus increasing the bias poppet valve, there- fore a greater fluid pressure is needed to open said valve. The poppet valve of this invention has a cylindrical section and a truncated cone section. The truncated cone section has a multiplicity of bores extending radially therethrough. The inlet port is sealed by the end of the truncated cone section which has a captured O ring extending radially therefrom. Only an amount of the O ring sufficient to seal a flat surface extends from the truncated cone section of the poppet valve.
529809
Helix Technology Corp.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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