Patent ID: 9098091
Filing Date: 2015-08-04
Classification: F16K,G05D,Y10T

Abstract:
1. A pressure reducer for a device for enriching a liquid with gas comprising: a housing made of a plastic material, said housing having an inlet, an inlet port for connecting said pressure reducer to a gas vessel, an outlet, an outlet port for connecting said pressure reducer to a continuous flow mixer, and an expansion chamber for expanding the enrichment gas to a reduced pressure; a control body arranged in the housing so as to be axially displaceable in said housing, said control body being biased in a closing direction by means of a first spring so as to close a connection between said inlet and said expansion chamber, and said control body comprising a first seal which co-operates with a seating surface upstream of said expansion chamber; an actuating piston arranged in the housing so as to be axially displaceable in said housing, said actuating piston being biased by means of a second spring so as to displace said control body in an opening direction as a function of the pressure in said expansion chamber and thus to open the connection between said inlet and said expansion chamber, wherein the actuating piston delimits one side of the expansion chamber such that a variable internal volume of said expansion chamber is determined by an axial position of said actuating piston, and said actuating piston comprising a second seal which seals the expansion chamber relative to the outside; wherein said pressure reducer further comprises a separately made insert which is arranged in said housing in a seating between said inlet and said expansion chamber, said insert comprising a guide bore, which is connected to said inlet and which supports said control body axially displaceably, and a connecting bore adjoining said guide bore, said connecting bore being connected to said expansion chamber and said connecting bore being of a reduced diameter relative to the guide bore, such that said insert forms an annular shoulder surface at a step between said connecting bore and said guide bore, said annular shoulder co-operating as a seating surface with said first seal of said control body, wherein a seating is provided in the insert at the inlet end thereof, in which seating is mounted a first retaining plate with a gas passage, which forms an immobile support for the first spring.