| 摘要 |
A control valve for hydraulic media is provided. The control valve includes a valve body having four ports. A first seat, a second seat, and a dual seat are positioned in the valve body between the ports. Two poppets, each including a disc and a cup, with a spring located therebetween, are arranged on a cylindrical pin with an enlarged engagement portion that is slidably supported within the valve body. A solenoid assembly movable in an axial direction within the valve body contacts the cylindrical pin and adjusts the position of the discs and cups of the poppets with respect to the seats of the valve body to minimize unwanted leakage between the ports. This configuration comprises four variable orifices that cooperate to provide controlled flow during different energizing phases of the solenoid assembly. |
| 主权项 |
1. A control valve for hydraulic media, comprising:
a valve body defining an axial end port, a first peripheral control port, a second peripheral control port, and a medial peripheral port, a first seat positioned in the valve body between the axial end port and the first peripheral control port, a dual seat surrounding the medial peripheral port and positioned in the valve body between the first peripheral control port and the second peripheral control port, a second seat positioned in the valve body between the second peripheral control port and a first axial end of the valve body opposite the axial end port, a first poppet, including a first disc, a first cup, and a first spring located therebetween, positioned between the first seat and the dual seat, a second poppet, including a second disc, a second cup, and a second spring located therebetween, positioned between the dual seat and the second seat, a cylindrical pin with an enlarged engagement portion slidably supported within the valve body, a solenoid assembly including a sleeve and a armature movable in an axial direction with the armature contacting a first end of the cylindrical pin, a retainer and a return spring acting on a second end of the cylindrical pin, the first poppet being located on the cylindrical pin for sliding movement between the enlarged engagement portion and the retainer, and the second poppet being located on the cylindrical pin for sliding movement between the enlarged engagement portion and the sleeve, wherein the first and second poppets are pressed closed and the first peripheral control port is in fluid connection with the axial end port and the medial peripheral port is in fluid connection with the second peripheral control port when the solenoid assembly is in a deactivated state, the armature presses the cylindrical pin against the retainer when the solenoid assembly is actuated in a first state such that the first peripheral control port is isolated from fluid connection by the first disc contacting the first seat and the first cup contacting the dual seat, and the second peripheral control port is isolated from fluid connection by the second disc contacting the dual seat and the second cup contacting the second seat, and the sleeve engages the second cup when the solenoid assembly is actuated in a second state, such that the second peripheral control port is in fluid connection with the axial end port, and the medial peripheral port is in fluid communication with the first peripheral control port. |
