Piston arrangement, in particular for metering valves

Details Piston arrangement, in particular for metering valves Piston arrangement, in particular for metering valves

F - Mech Eng,Light,Heat,Weapons

16

N

F16N 25/02 (2006.01) F16N 27/00 (2006.01)

Patent

CA 2627448

The invention relates to a piston arrangement, in particular for metering valves, flow sensors or hydraulic motors, having a housing (4, 22), in which at least one cylindrical hollow space is formed, in which a first piston (8, 23) which has a cylindrical hollow space at least in a region is mounted in a sealed and displaceable manner, and having a second piston (7, 24) which is mounted displaceably in the cylindrical hollow space of the first piston (8, 23). Here, a valve seat is formed in the first piston (8, 23), against which the second piston (7, 24) can be brought to bear with a sealing face in such a way that the second piston (7, 24) can be displaced in the first piston (8, 23) between a position which releases a flow passage through the first piston (8, 23) and a position which shuts off a flow passage through the first piston (8, 23).

L'invention concerne un agencement de piston, en particulier pour vannes de dosage, sondes de débit ou moteurs hydrauliques, qui présente un boîtier (4, 22) dans lequel est formé au moins un espace cylindrique creux dans lequel un premier piston (8, 23) est monté à coulissement de manière étanche, au moins une partie du premier piston présentant un espace cylindrique creux, et un deuxième piston (7, 24) est monté à coulissement dans l'espace cylindrique creux du premier piston (8, 23). Dans le premier piston (8, 23) est formé un siège de soupape sur lequel le deuxième piston (7, 24) peut être placé par une surface d'étanchéité, de telle sorte que le deuxième piston (7, 24) peut coulisser dans le premier piston (8, 23) entre une position qui libère un passage d'écoulement à travers le premier piston (8, 23) et une position qui bloque le passage d'écoulement à travers le premier piston (8, 23).

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