Abstract:
The invention relates to a valve for the control of a fluid flow, with a connection block (24) which comprises a cylinder-symmetrical recess (25), wherein at least one first and a second entry channel (20, 22, 30, 35) as well as a first and a second exit channel (21, 23, 32, 37) run out in the peripheral surface of the recess, as well as with a control pin (29) which is fitted into the recess, is rotatable about a rotation axis (29a), comprises at least two through-channels (38, 39, 40, 41, 42) and connects different ones of the entry and exit channels of the connection block to one another depending on its angular position. In order to create a valve which may advantageously be applied with dual blood pump systems and with a low flow resistance and low wear, with a rapid and reliable switching capability, according to the invention, one envisages a first through-channel (38, 41) in the pin, with respect to the rotation axis, exclusively connecting channels (30, 31, 32) running out at a first axial height, to one another, and a second through-channel (40, 42) exclusively connecting channels (35, 36, 37) running out at a second axial height, to one another. The invention further relates to a corresponding pump system and to a method for operating the system.
Abstract:
The invention relates to a cylinder housing, in particular a pump cylinder housing, with a hollow cylinder (1) and with an end-side cover part (2, 2'), characterised by a threaded sleeve (14, 14') which may be fixed on the outside on the hollow cylinder, at least three projections (9, 12, 13) which are connected to the cover part (2), are distributed on its periphery, in each case point radially outwards and at least partly pass through recesses (19, 20, 21) of the threaded sleeve, as well as a union nut (18) which may be screwed onto the threaded sleeve, wherein the projections (9, 9', 12, 12', 13) project radially out of the threaded sleeve and bear on an end side (22) of the union nut. The cylinder housing may be assembled in a simple manner by way of this design, wherein the cylinder housing and the cover part may be connected to one another in an exactly colinear and centred manner and thereby may be reliably sealed. The cylinder cover may thereby be positioned in an infinite radial position on the cylinder.