Two-stage variable force solenoid

摘要

A two-stage, variable force, solenoid control valve for regulating fluid pressure can include a valve body having a pilot fluid passage, including a metering land, in fluid communication with a flow amplifying fluid passage through a valve control port formed in the valve body. A solenoid operated pilot valve member, disposed in the pilot fluid passage can have a metering orifice operable in combination with the metering land for selectively connecting the valve control port with a pressurized fluid supply port and a return exhaust port in response to activation of a solenoid. A flow amplifying spool valve member, in fluid communication with the valve control port of the pilot valve member at one end, can selectively connect a load control port with the pressurized fluid supply port and the return exhaust port in response to pilot valve member operation.

主权项

1. A two-stage, variable force, solenoid control valve (10) for regulating fluid pressure comprising:
a single unitary valve body (12) having a pilot fluid passage (14) and a flow amplifying fluid passage (18), the pilot fluid passage (14) including a metering land (16) and in fluid communication with the flow amplifying fluid passage (18) through a valve control port (20) formed in the single unitary valve body (12); a solenoid operated pilot valve member (22), disposed in the pilot fluid passage (14), having a metering orifice (24) operable in combination with movement relative to the metering land (16) for selectively connecting the valve control port (20) with a pressurized fluid supply port (26) and a return exhaust port (28) in response to solenoid operated activation of the pilot valve member (22); and a flow amplifying spool valve member (30) disposed in the flow amplifying fluid passage (18), in fluid communication with the valve control port (20) at one end (30a) for selectively connecting a load control port (32) with the pressurized fluid supply port (26) and the return exhaust port (28) in response to fluid pressure controlled through the pilot valve member (22); and a spring member (36) for biasing the pilot valve member (22) in a direction away from the flow amplifying spool valve member (30) to provide zero pilot pressure and maintain contact with an armature (52).