Patent ID: 6305418
Filing Date: 2001-10-23
Classification: F16K,Y10T

Abstract:
A hydraulic valve, comprising:a valve housing composed of planar parallel, plate-shaped segments (36-46), the valve housing (34) having a longitudinal axis (72), longitudinal channels, radial channels, a central valve channel (71), and central channel widening grooves defined therein, wherein:said longitudinal channels (96, 97) are comprised of channel segments formed by through-holes through said plate-shaped segments, said through-holes having a cross-section with a closed edge, said channel segments being in communication with adjoining channel segments of adjacent plate-shaped segments to form said longitudinal channels,said central valve channel (71) is formed by adjoining central openings (75, 77, 79 and 81) of adjacent housing segments (38, 40, 42 and 44),said radial channels are in communication with a supply connection (11, 12) or a user connection (13, 14), and said radial channels or segments of such channels are formed by radial extensions (86-98) of said central openings (75, 77, 79 and 81) of said plate-shaped valve housing segments (38, 40, 42 and 44), andsaid central channel widening grooves (91, 92, 93 and 93) widen the cross-section of the central channel (71); anda valve piston (19) mounted in said central valve channel (71) for movement in at least one of sliding in the longitudinal direction and rotation in a pressure-tight manner;wherein various functional positions of the valve piston relative to the valve piston housing define various combinations or subcombinations of flow paths, wherein segments of such flow paths are formed by said grooves and channels in at least one of the housing and the piston, which flow path sections are in fluid communication with at least one of (a) each other, (b) pressure-connections, (c) tank-connections, and (d) user connections;and wherein said valve housing plate-shaped segments (36-46) are joined by brazing after at least one of form-fittingly and materially assembling said plates into a dimensionally stable package with brazing material introduced into closed compartments which are formed by groups of interconnected through-holes (121 to 124, 126) of the segment plates (37-45), which compartments extend over the whole series of joints of the segment plates (36 to 46).