Patent ID: 11920572
Assignee: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  G | IPC B  F

Claim 0:
1. A fluid flow control valve comprising: a tubular body extending in a longitudinal direction with a fluid inlet and a fluid outlet situated respectively at the two longitudinal ends of the body; a nozzle having an expansion coefficient different from a material that the tubular body consists of; a piston connected to the body having an expansion coefficient different from the material that the tubular body consists of and comprising a body defining a passage for the fluid in the body for the flow of the fluid between the inlet and the outlet and also a ball at a terminal end of the piston that is crimped into the body of the piston; and a heating member which, depending on the heating power delivered, makes it possible to separate the end of the nozzle and the piston by differential expansion, to allow the flow of fluid between the inlet and the outlet in an open position of the valve, wherein:
the piston is housed in the body;
the nozzle is made up of a part provided with a fluid passage having a calibrated dimension, the fluid passage of the nozzle emerging at one end of the nozzle and forming a seat, said seat being situated against a terminal end of the piston forming a shutter preventing the flow of fluid in the closed position of the valve;
the body of the piston comprises a tubular portion one end of which is crimped around the ball; and
the tubular portion comprises longitudinal grooves emerging at the end crimped around the ball, said grooves defining longitudinal retaining tabs that are folded around the ball and being configured to allow the passage of the fluid when the valve is in the open position.