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    Two stage pressure control valve
    11.
    发明专利
    Two stage pressure control valve 未知

    公开(公告)号：AU672713B2

    公开(公告)日：1996-10-10

    申请号：AU7091194

    申请日：1994-04-01

    Applicant: APPLIED POWER INC

    Inventor： STOBBS THOMAS J

    IPC: B60G17/056 ,  F15B13/043 ,  G05D16/20 ,  B60G17/08 ,  F16F9/46 ,  F16K31/40 ,  F16K31/383

    Abstract: A two stage pressure control valve has a poppet movable toward and away from a valve seat to vary the cross-sectional area of a passageway from an inlet to an outlet. The position of the poppet is dependent in part on the difference in pressure between a fluid pressure at the inlet which exerts an force on the poppet in one axial direction and a control pressure which is produced by a fluid flow from the inlet in a chamber downstream from the inlet and which exerts a force on the poppet in the opposite axial direction. The control pressure is controlled by an electromagnetic coil which can be variably energized to move an armature so as to vary a variable restriction downstream from the control pressure so as to vary the control pressure. A tube extends through and forms an axial sliding seal with the poppet and communicates a flow of fluid from the inlet to the variable restriction and the chamber is positioned adjacent to an exterior surface of the tube. An orifice through a wall of the tube communicates a lumen of the tube with the chamber.

    PROPORTIONAL PRESSURE CONTROL VALVE
    13.
    发明专利
    PROPORTIONAL PRESSURE CONTROL VALVE 未知

    公开(公告)号：CA2123119A1

    公开(公告)日：1993-06-10

    申请号：CA2123119

    申请日：1992-12-01

    Applicant: APPLIED POWER INC

    Inventor： STOBBS THOMAS J ,  TRICKLE GLEN W

    IPC: F16F9/46 ,  B60T8/36 ,  B60T15/02 ,  F16F9/512 ,  F16K31/06 ,  G05D16/20 ,  F16K17/10 ,  F16F9/34

    Abstract: 2123119 9311370 PCTABS00022 A proportional pressure control valve (10) has a metering spool (42) which selectively meters flow between an axial first port (12) and radial second ports (14). The spool (42) is axially reciprocable with a larger face (40) toward the first port (12) and a smaller face (62) opposite from the first port (12), with a pressure equalization bore (60) through the spool (42). A first spring (64) extends between the smaller face (62) of the spool (42) and an armature (66) and the armature (66) is biased to a normal position by a second spring (74) and also has a pressure equalization bore (72) through it. Radial orifices (70) are formed in the end of the armature (66) facing the smaller face (62) of the spool (42), and the end of the armature (66) seats in the main bore (46) in which the spool (42) is seated. Passageways (90) extend from the orifices (70) to the second ports (14), and two selectively and variably energizable electromagnetic coils (80, 82) coaxially encircle the armature (66), one to draw the armature (66) to one side of the normal position and the other to draw the armature (66) to the opposite side. The normal position of the armature (66) preferably biases the spool (42) to an intermediate setting so that energizing the coil (82) which is toward the closed position of the spool (42) stiffens the response of the valve (10) and energizing the coil (80) which is away from the closed position of the spool (42) softens the response of the valve (10). Energizing one or the other coil (80, 82) also varies the exposed area of the orifices (70) to change the slope of the pressure-flow rate curve (98, 99, 100, 101, 102) at the particular energization level for low flow rates.

    Biderctional flow control valve
    15.
    发明专利
    Biderctional flow control valve 未知

    公开(公告)号：AU5867496A

    公开(公告)日：1997-01-15

    申请号：AU5867496

    申请日：1996-05-21

    Applicant: APPLIED POWER INC

    Inventor： ROGALA JEFFREY A ,  STOBBS THOMAS J ,  LAMBERT DANIEL J ,  DAHLGREN DEREK A

    IPC: F16K3/26 ,  G05D7/06

    Abstract: A bidirectional flow control valve has one port co-axial with a tubular spool and another port opening to the side of the spool, with openings formed in the sidewall of the spool to establish communication between the two ports. The end of the spool adjacent to the one port abuts the brim of a tubular hat-shaped insert which extends inside the lumen of the spool to a closed end on the distal side of the other port. Openings are formed in the sidewall of the insert which are in communication with openings in the sidewall of the spool via an annular groove in the exterior of the insert. The insert reacts against flow forces, helps equalize pressures from one end of the spool to the other, and does not increase the pressure drop across the valve.

    Proportional pressure control valve
    17.
    发明专利
    Proportional pressure control valve 未知

    公开(公告)号：AU666907B2

    公开(公告)日：1996-02-29

    申请号：AU3225193

    申请日：1992-12-01

    Applicant: APPLIED POWER INC

    Inventor： STOBBS THOMAS J ,  TRICKLE GLEN W

    IPC: F16F9/46 ,  B60T8/36 ,  B60T15/02 ,  F16F9/512 ,  F16K31/06 ,  G05D16/20 ,  F16K31/40 ,  F16F9/34 ,  F16K17/10

    Abstract: A proportional pressure control valve has a metering spool which selectively meters flow between an axial first port and radial second ports. The spool is axially reciprocable with a larger face toward the first port and a smaller face opposite from the first port, with a pressure equalization bore through the spool. A first spring extends between the smaller face of the spool and an armature and the armature is biased to a normal position by a second spring and also has a pressure equalization bore through it. Radial orifices are formed in the end of the armature facing the smaller face of the spool, and the end of the armature seats in the main bore in which the spool is seated. Passageways extend from the orifices to the second ports, and two selectively and variably energizable electromagnetic coils coaxially encircle the armature, one to draw the armature to one side of the normal position and the other to draw the armature to the opposite side. The normal position of the armature preferably biases the spool to an intermediate setting so that energizing the coil which is toward the closed position of the spool stiffens the response to the valve and energizing the coil which is away from the closed position of the spool softens the response of the valve. Energizing one or the other coil also varies the exposed area of the orifices to change the slope of the pressure-flow rate curve at the particular energization level for low flow rates.

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