ES8400942A1 - Flow control valve for hydraulic circuits - Google Patents

Abstract

The valve is provided with a movable slide valve (8) operable to open a first flow passage (21) between a supply duct (13), which connects a source of fluid under pressure with the valve, and a duct (14), which connects the valve itself with a utiliser, and a second flow passage (23) between this utilisation duct (14) and a discharge duct (15). - The slide valve (8) is in equilibrium between a resilient force generated by a spring (25) which acts on it and the force, in the opposite direction, generated by the fluid pressure in a chamber (28) which is supplied with fluid via a fixed thro throttle (31) and the discharge flow cross section from which is controlled by a valve member (33,34) operated by an electromagnet (35,36). The valve may control an automatic gearbox. (2/4) DEAB- DE3226696 C The electromagnetically operated valve (1) for an automatic transmission, is inserted between the hydraulic source and a load and between the load and the hydraulic discharge line and has a feed chamber (13), a load chamber (11) and a discharge chamber (12) lying axially one behind the other. A valve slider (8) is displaced axially and has 2 cylindrical end sections (8a, 8b) of similar dia. and a reduced dia. central section (8c). - The valve slider (8) is held in an output position via a resetting spring (25) at one end and is operated by an electromagnet (36) at the other end, supported by a ring (29) defining a control chamber (28) coupled via a throttle (31) to an auxilliary control channel (30).