Abstract:
A solenoid valve (1) is described comprising a first port (2), a second port (3), a valve element (4) and a valve seat (5) arranged between said first port (2) and said second port (3), a coil (12) and a yoke arrangement (14-16), said coil (12) being magnetically linked to said yoke arrangement (14-16), said yoke arrangement (14-16) having a movable armature (16). In such a solenoid valve the generation of noise should be kept low. To this end said valve element (4) is driven by a pressure difference between a first pressure on a first side (6) of said valve element (4) and a second pressure on a second side (7) of said valve element (4), at least one of said first pressure and said second pressure being controlled by means of said armature (16), wherein said armature (16) comprises a first front face (18) at a first end and a second front face (19) at a second end opposite said first end, said first front face (18) and said second front face (19) being connected by a first flow path (21), said first flow path having first throttling means for keeping low a flow of a fluid flowing through said first flow path (21).
Abstract:
An electronic expansion valve (1) is provided, comprising an inlet (9), an outlet (8), an armature (2), a stop member (3), a biasing member (4) and a solenoid coil (12). The biasing member (4) provides a biasing force on the armature (2) towards a closing direction while the solenoid coil (12) may be provided with a current to provide a magnetic force on the armature (2) towards an opening direction. It is intended to provide an electronic expansion valve that may be controlled more precisely and has a higher safety. To this end the pressure difference between the inlet pressure and the outlet pressure provides a differential pressure force on the armature (2) towards an opening direction to allow a fluid flow from the inlet (9) to the outlet (8), and furthermore the armature (2) is displaced away from the stop member (3) to allow a fluid flow from the inlet (9) to the outlet (8) if the sum of the magnetic force and the differential pressure force on the armature (2) exceeds the biasing force. The invention furthermore relates to a refrigeration system comprising such an electronic expansion valve as well as a method for calibrating such an electronic expansion valve.
Abstract:
A proportional valve is provided comprising a valve (1) comprising a housing (2) having an inlet (3) and an outlet (4), a valve element (5) being positioned be¬ tween said inlet (3) and said outlet (4), said valve element (5) being moveable in said housing (2), said valve element (5) having a pilot valve opening (7), a first pressure chamber (16), a pressure in said first pressure chamber (16) acting on said valve element (5) in a first direction, a second pressure chamber (17), a pressure in said pressure chamber (17) acting on said valve element (5) in a second direction opposite to said first direction, a pilot valve element (6) coop¬ erating with said pilot valve opening (7) to form a pilot valve, said pilot valve element (6) being actuated by drive means (8), wherein a flow resistance be¬ tween said inlet (3) and said first pressure chamber (16) is smaller than a flow resistance between said inlet (3) and said second pressure chamber (17). In such valve it is possible to reduce the electrical power needed to operate the solenoid. To this end said pilot valve opens into a third pressure chamber (19), said third pressure chamber (19) being connected to said outlet (3) via a throttled flow path (20).
Abstract:
Ventil (1) mit einem Ventilgehäuse (2), in dem ein Ventilsitz (5) und ein Einlass (3) und ein Auslass (4) angeordnet sind. Das Ventilelement (6) ist dabei in einem Deckel (9) des Ventilgehäuses angeordnet und auf seiner dem Ventilsitz (5) zugewandten Seite mit einer Stützplatte (10) befestigt. Um das Verlieren einzelner Bauteile des Ventils beim Abnehmen des Deckels zu verhindern, ist die Stützplatte im Deckel befestigt.
Abstract:
A magnetic actuator (1) comprising a first pole part (2), a second pole part (3) movable relative to the first pole part (2), a coil (5) arranged circumferentialIy relative to the pole parts (2, 3), and a flux conductor guide (12) arranged between the second pole part (3) and the coil (5) and adapted to guide magnetic flux generated by the coil (5) to the second pole part (3). The flux conductor guide (12) and the second pole part (3) each define a cross sectional area which varies stepwise along a direction of movement of the second pole part (3) in such a manner that the stepwise varying part of the flux conductor guide (12) can be received within the stepwise varying part of the second pole part (3), or in such a manner that the stepwise varying part of the second pole part (3) can be received within the stepwise varying part of the flux conductor guide (12). Furthermore, a magnetic valve (9) having the actuator (1) arranged therein.
Abstract:
The present invention relates to a check valve unit (1, 100, 200, 300, 400) having a shaft bearing body (10, 110, 210, 310, 410) with an at least substantially cylindrical mounting portion (11) extending along an axial direction (A) and an axially extending valve shaft (20, 120) mounted therein. The latter is displaceable along the axial direction (A). The check valve unit (1, 100, 200, 300, 400) further includes a valve head (25, 125) with a sealing surface (33, 133), wherein the valve head (25, 125) is disposed on a distal end (21) of the valve shaft (20, 120) in the axial direction (A), the distal end (21) facing away from the mounting portion (11). Further, a damping reservoir (50) is provided inside the shaft bearing body (10, 110, 210, 310, 410). A volume of the damping reservoir (50) is changed by axial movement of the valve shaft (20, 120). In order to obtain a well-defined times for opening and closing under given conditions and to make the check valve unit (1, 100, 200, 300, 400) less prone to making noise, at least two channels (46a, 46b) are provided in parallel, each of them constituting a fluid connection between the damping reservoir (50) and an outside (70). The damping reservoir (50) is, apart from the channels (46a, 46b), at least substantially enclosed. Each channel (46a, 46b) has a length being at least ten times a hydraulic diameter of the respective channel (46a, 46b).
Abstract:
A magnetic valve (1) comprising a valve housing (2) defining an inlet opening (3) and an outlet opening (4), a valve seat (11), a valve closing element, and an armature tube (7) is disclosed. A piston (6) is arranged movably inside the armature tube (7), said piston (6) being connected to the valve closing element, and an armature (5) is arranged movably at least partly inside the piston (6). A coil (9) is arranged externally to the armature tube (7) in such a manner that at least a part of the armature (5) arranged inside the piston (6) is arranged inside the windings of the coil (9).
Abstract:
A proportional valve is provided comprising a valve (1) comprising a housing (2) having an inlet (3) and an outlet (4), a valve element (5) being positioned be¬ tween said inlet (3) and said outlet (4), said valve element (5) being moveable in said housing (2), said valve element (5) having a pilot valve opening (7), a first pressure chamber (16), a pressure in said first pressure chamber (16) acting on said valve element (5) in a first direction, a second pressure chamber (17), a pressure in said pressure chamber (17) acting on said valve element (5) in a second direction opposite to said first direction, a pilot valve element (6) coop¬ erating with said pilot valve opening (7) to form a pilot valve, said pilot valve element (6) being actuated by drive means (8), wherein a flow resistance be¬ tween said inlet (3) and said first pressure chamber (16) is smaller than a flow resistance between said inlet (3) and said second pressure chamber (17). In such valve it is possible to reduce the electrical power needed to operate the solenoid. To this end said pilot valve opens into a third pressure chamber (19), said third pressure chamber (19) being connected to said outlet (3) via a throttled flow path (20).