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 p
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.
대표청구항▼
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 wi
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); anda 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); anda 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). 2. The control valve (10) of claim 1, wherein the single unitary valve body (12) further comprises: the single unitary monolithic elongate valve body (12) housing the pilot valve member (22) and the flow amplifying spool valve member (30) for reciprocal movement. 3. The control valve (10) of claim 2 further comprising: the pilot valve member (22) and the flow amplifying spool valve member (30) moveable long a common axis of the single unitary monolithic elongate valve body (12). 4. The control valve (10) of claim 1 further comprising: a solenoid actuator (34) connected to the pilot valve member (22) adjacent the pilot fluid passage (14), the solenoid actuator (34) operable to move the pilot valve member (22) in proportion to a magnitude of electrical energy supplied. 5. The control valve of claim 1 further comprising: a spool valve biasing member (38) for urging the flow amplifying spool valve member (30) toward a predetermined spool valve position to provide a second stage control pressure offset less than a pilot stage pressure. 6. The control valve of claim 1 further comprising: the solenoid operated pilot valve member (22) supported by the valve body (12) for reciprocation within the pilot fluid passage (14) of the valve body (12), and the solenoid operated pilot valve member (22) defining an internal fluid passage extending between the metering orifice (24) formed in the solenoid operated pilot valve member (22) and the valve control port (20) formed in the valve body (12) for selectively connecting the valve control port (20) with the pressurized fluid supply port (26) and the return exhaust port (28) in response to solenoid operated activation of the pilot valve member (22). 7. The control valve (10) of claim 1, wherein the flow amplifying spool valve member (30) further comprises: a land (46) isolating the load control port (32) from a feedback pressure chamber (48) located within the single unitary valve body (12), the feedback pressure chamber (48) in fluid communication with the load control port (32) through a feedback pressure orifice (50). 8. A two-stage, variable force, solenoid control valve (10) for regulating fluid pressure comprising: a single unitary monolithic elongate valve body (12) having a pilot fluid passage (14) and a flow amplifying fluid passage (18), the pilot fluid passage (14) having a metering land (16) and the flow amplifying fluid passage (18) in fluid communication with the pilot fluid passage (14) through a valve control port (20) formed in the single unitary monolithic elongate valve body (12), the single unitary monolithic elongate valve body (12) including a pressurized fluid supply port (26) connected to the pilot fluid passage (14) and to the flow amplifying fluid passage (18), a load control port (32) connected to the flow amplifying fluid passage (18), and a return exhaust port (28) connected to the flow amplifying fluid passage (18) and to the pilot fluid passage (14);a solenoid (34) connectible to the single unitary monolithic elongate valve body (12) adjacent the pilot fluid passage (14);a pilot valve member (22) disposed in the pilot fluid passage (14) of the single unitary monolithic elongate valve body (12) and connected to the solenoid (34), the solenoid (34) operable to move the pilot valve member (22) in proportion to a magnitude of electrical energy supplied, the pilot valve member (22) having a metering orifice (24) operable in combination with movement relative to the metering land (16) of the valve body (12) for selectively connecting the valve control port (20) in fluid communication between the pressurized fluid supply port (26) and the return exhaust port (28) in response to activation of the solenoid (34); anda flow amplifying spool valve member (30) disposed in the flow amplifying fluid passage (18) of the single unitary monolithic elongate valve body (12) and in fluid communication with the valve control port (20) associated with the metering land (16) of the pilot valve member (22) at one end (30a) to define an expandable chamber (21) located within the single unitary monolithic elongate valve body (12) between the one end (30a) and the valve control port (20), the flow amplifying spool valve member (30) for selectively connecting the load control port (32) in fluid communication between the pressurized fluid supply port (26) and the return exhaust port (28) in response to fluid pressure in the expandable chamber (21) controlled through the pilot valve member (22), wherein the flow amplifying spool valve member (30) includes a first land (42) operable in cooperation with movement relative to the valve body (12) in response to fluid pressure acting through the valve control port (20) to open and close fluid communication between the load control port (32) and the return exhaust port (28), the first land (42) isolating the valve control port (20) from the return exhaust port (28), a second land (44) operable in cooperation with movement relative to the valve body (12) to isolate the pressurized fluid supply port (26) from the return exhaust port (28), and a third land (46) operable in cooperation with movement relative to the valve body (12) in response to fluid pressure acting through the valve control port (20) to open and close fluid communication between the load control port (32) and the pressurized fluid supply port (26), the third land (46) isolating the load control port (32) from a feedback pressure chamber (48) in fluid communication with the load control port (32) through a feedback pressure orifice (50). 9. The control valve (10) of claim 8 further comprising: a pilot valve biasing member (36) for urging the pilot valve member (22) toward a predetermined pilot valve position to provide zero pilot pressure and maintain contact with solenoid (34);a spool valve biasing member (38) for urging the flow amplifying spool valve member (30) toward a predetermined spool valve position to provide a second stage control pressure offset less than a pilot stage; anda solenoid biasing member (40) for urging the solenoid toward a predetermined solenoid position. 10. The control valve of claim 8 further comprising: the solenoid operated pilot valve member (22) supported by the valve body (12) for reciprocation within the pilot fluid passage (14) of the valve body (12), and the solenoid operated pilot valve member (22) defining an internal fluid passage extending between the metering orifice (24) formed in the solenoid operated pilot valve member (22) and the valve control port (20) formed in the valve body (12) for selectively connecting the valve control port (20) with the pressurized fluid supply port (26) and the return exhaust port (28) in response to solenoid operated activation of the pilot valve member (22). 11. In a fluid handling system including a pressurized fluid supply line, a return exhaust line, and a load control line, a two-stage, variable force, solenoid control valve (10) for regulating fluid pressure comprising: a single monolithic elongate 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 monolithic elongate 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 the pressurized fluid supply line through a pressurized fluid supply port (26) and the return exhaust line through a return exhaust port (28) in response to solenoid operated activation of the pilot valve member (22);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) defining an expandable chamber (21)) located within the single monolithic elongate valve body (12) between the one end (30a) and the valve control port (20), the flow amplifying spool valve member (30) for selectively connecting the load control line through a load control port (32) with the pressurized fluid supply port (26) and the return exhaust port (28) in response to fluid pressure in the expandable chamber (21) controlled through the pilot valve member (22); anda 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). 12. The two-stage, variable force, solenoid control valve (10) of claim 11, wherein the single unitary monolithic elongate valve body (12) further comprises: the single unitary monolithic elongate valve body (12) enclosing the pilot valve member (22) and the flow amplifying spool valve member (30) for reciprocal movement. 13. The two-stage, variable force, solenoid control valve (10) of claim 12 further comprising: the pilot valve member (22) and the flow amplifying spool valve member (30) are moveable along a common axis of the single elongate valve body (12). 14. The two-stage, variable force, solenoid control valve (10) of claim 11 further comprising: a solenoid actuator (34) connected to the pilot valve member (22) adjacent the pilot fluid passage (14), the solenoid actuator (34) biased by a spring member (40) toward the pilot valve member (22) and operable to move the pilot valve member (22) in proportion to a magnitude of electrical energy supplied. 15. The two-stage, variable force, solenoid control valve (10) of claim 11 further comprising: a spring member (38) for biasing the flow amplifying spool valve member (30) toward the valve control port (20) to provide a second stage control pressure offset less than a pilot stage pressure to improve output gain linearity and reduce system fluid contamination sensitivity. 16. The two-stage, variable force, solenoid control valve (10) of claim 11 further comprising: the solenoid operated pilot valve member (22) supported by the valve body (12) for reciprocation within the pilot fluid passage (14) of the valve body (12), and the solenoid operated pilot valve member (22) defining an internal fluid passage extending between the metering orifice (24) formed in the solenoid operated pilot valve member (22) and the valve control port (20) formed in the valve body (12) for selectively connecting the valve control port (20) with the pressurized fluid supply port (26) and the return exhaust port (28) in response to solenoid operated activation of the pilot valve member (22). 17. A two-stage, variable force, solenoid control valve (10) for regulating fluid pressure comprising: a single elongate valve body (12) having a pilot fluid passage (14) with a metering land (16) and a flow amplifying fluid passage (18) in fluid communication with the pilot fluid passage (14) through a valve control port (20) formed in the valve body (12), the valve body (12) including a pressurized fluid supply port (26) connected to the pilot fluid passage (14) and to the flow amplifying fluid passage (18), a load control port (32) connected to the flow amplifying fluid passage (18), and a return exhaust port (28) connected to the flow amplifying fluid passage (18) and to the pilot fluid passage (14);a solenoid (34) connectible to the valve body (12) adjacent the pilot fluid passage (14);a pilot valve member (22) disposed in the pilot fluid passage (14) of the valve body (12) and connected to the solenoid (34), the solenoid (34) operable to move the pilot valve member (22) in proportion to a magnitude of electrical energy supplied, the pilot valve member (22) having a metering orifice (24) operable in combination with movement relative to the metering land (16) of the valve body (12) for selectively connecting the valve control port (20) in fluid communication between the pressurized fluid supply port (26) and the return exhaust port (28) in response to activation of the solenoid (34); anda flow amplifying spool valve member (30) disposed in the flow amplifying fluid passage (18) of the valve body (12) and in fluid communication with the valve control port (20) associated with the metering land (16) of the pilot valve member (22) at one end (30a) to define an expandable chamber (21) between the one end (30a) and the valve control port (20), the flow amplifying spool valve member (30) for selectively connecting the load control port (32) in fluid communication between the pressurized fluid supply port (26) and the return exhaust port (28) in response to fluid pressure in the expandable chamber (21) controlled through the pilot valve member (22), the flow amplifying spool valve member including a first land (42) operable in cooperation with movement relative to the valve body (12) in response to fluid pressure acting through the valve control port (20) to open and close fluid communication between the load control port (32) and the return exhaust port (28), the first land (42) isolating the valve control port (20) from the return exhaust port (28), a second land (44) operable in cooperation with movement relative to the valve body (12) to isolate the pressurized fluid supply port (26) from the return exhaust port (28), and a third land (46) operable in cooperation with movement relative to the valve body (12) in response to fluid pressure acting through the valve control port (20) to open and close fluid communication between the load control port (32) and the pressurized fluid supply port (26), the third land (46) isolating the load control port (32) from a feedback pressure chamber (48) in fluid communication with the load control port (32) through a feedback pressure orifice (50).
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이 특허에 인용된 특허 (22)
Anderson David L. (Muskegon MI), Electromagnetic solenoid valve with variable force motor.
Rector Charles E. (Waubun MN) Wells Steven R. (Aurora IL) Mather Daniel T. (Lockport IL) Arndt Robin S. (Crest Hill IL), Hydraulic cylinder snubbing arrangement.
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