Electric valve device

摘要

An electric valve device including a body having an inlet and an outlet, and a main valve seat through which the fluid can flow from the inlet to the outlet, a main shutter movable with respect to the valve seat; a control chamber; first and second communication passages between the inlet and the control chamber and between the control chamber and the outlet, respectively; a fixed structure arranged in the control chamber and in which there is defined an auxiliary valve seat, which is coaxial with the main valve seat (8) and which communicates with said second passage; and a solenoid control valve including a control solenoid coaxial with the valve seats for controlling an auxiliary shutter mounted movably in the control chamber and cooperating with the auxiliary valve seat for controlling the communication between the control chamber and the second passage.

主权项

1. An electric valve device (1), comprising:
a body (2; 3, 4) having an inlet (5) and an outlet (6) for the fluid, and a main valve seat (8) through which the fluid can flow from the inlet (5) to the outlet (6); a main shutter (12) movable with respect to said valve seat (8) between a position for closing and a position for opening said seat (8); a control chamber (13) defined within the body (2; 3, 4) and delimited in part by the main shutter (12); at least one first and one second communication passage (17; 15, 16) between the inlet (5) and the control chamber (13) and between the control chamber (13) and the outlet (6), respectively; a fixed structure (10) which is arranged in the control chamber (13) and inside which there is defined an auxiliary valve seat (14) which is coaxial with said main valve seat (8) and communicates with said second passage (15, 16); and a solenoid control valve (20) including a control solenoid (21) having an associated magnetic circuit (24, 25) and arranged coaxially with said valve seats (8, 14), for controlling an auxiliary shutter (27) which is mounted movably in the control chamber (13) and which is intended to cooperate with said auxiliary valve seat (14) for controlling the communication between the control chamber (13) and said second communication passage (15, 16), wherein the assembly formed by the solenoid (21) and the associated magnetic circuit (24, 25) is separated in a liquid-tight manner from the control chamber (13) by a thin layer (26) of thermally conducting material, facing the auxiliary shutter (27), the fixed structure (10) being shaped such that the fluid which during use flows into the control chamber (13) contacts said layer (26) of thermally conducting material, wherein said fixed structure (10) on the side facing the control solenoid (21) has a first annular protruding formation (10a) which is coaxial with said solenoid (21) and which surrounds the auxiliary valve seat (14) such as to define therewith a first annular groove, and the distal end of which faces the auxiliary shutter (27), which has a central portion (27a) which extends inside said formation (10a), and wherein said fixed structure (10) has a second annular protruding formation (10b), which is coaxial with and surrounds said first formation (10a) such as to define therewith a second annular groove, and the distal end of which faces an intermediate annular portion of the auxiliary shutter (27), which has a peripheral skirt portion (27b) which extends around said first formation (10a) within said second formation (10b) inside said second annular groove.