| 摘要 |
PURPOSE: Force balanced sonic flow emission control valve is provided to improving CPS valve which more make an estimate of purge flow control though influence control precision degree for damage. CONSTITUTION: Solenoid operated valve's outlet port (26) is a tube having a thread (60) threaded into a threaded socket (66, 68) in a valve housing member (34). The valve seat (62) is at an end of the tube, and the extent to which the tube is threaded into the socket sets the position of the seat within the housing's interior (42). Once the position has been set, an adhesive sealant is applied and, upon setting, forms a plug (164) which locks the tube in place and seals between the tube and the socket. The valve element (33) is spring-biased (160) closed on the seat, but when the solenoid is energized, it is unseated by the solenoid's armature (122) to which it is attached. The solenoid's stator (86, 88, 90) includes an annular shunt (90) which forms an air gap to the armature for the magnetic circuit that acts on the armature to unseat the valve element and which also holds the outer margin (154) of a diaphragm (124) sealed against the solenoid. The inner margin of the diaphragm is sealed to the armature. The diaphragm creates a space that is separated from the interior of the housing and to which vacuum at the outlet port is communicated via a passage (142) formed in the armature to provide force a lancing of the valve element. The outlet port also contains a sonic nozzle (28). The shunt is secured against the solenoid by tabs (102) at ends of the stator part (98) bent into interference with margins of notches (108) in the outer margin (104) of the shunt.
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