2/2 directional seat valve

A 2/2 directional seat valve with direct control comprising:

• a housing, said housing defining a housing bore and comprising a seating surface located therein, said housing having a pressure medium inlet perpendicular to the housing bore;
• a seat piston slidably installed in the housing bore, said seat piston having a first end and a second end, said seat piston comprising a conical surface at the second end thereof, the conical surface and the seating surface being configured to releasably engage with each other, said seat piston having a reduced cross-sectional area in a region of the pressure medium inlet;
• means for forming a leakproof seal between said seat piston and said housing bore in the vicinity of the first end of the seat piston;
• a closing spring arranged within said housing so that one end of said closing spring bears against said housing and the other end of said closing spring bears on said seat piston;
• wherein said seat piston comprises a high-strength carbon-fiber-reinforced plastic and a piston guide for guiding said seat piston, the piston guide extends along a portion of said seat piston to a location adjacent the conical surface, and said housing comprises a material selected from the group consisting of light metal and a light metal alloy, said seat piston and said housing define three recesses therebetween and the piston guide comprises three arms placed 60 degrees apart with the recesses between the arms, and extend axially over the region of the pressure medium inlet.