公开(公告)号：EP4343186A1

公开(公告)日：2024-03-27

申请号：EP22803817.0

申请日：2022-05-09

Applicant: Danfoss A/S

Inventor： WU, Jiang ,  PEDERSEN, Anders ,  BAO, Jinfeng

IPC: F16K17/00 ,  F16K1/52 ,  F16K31/04 ,  F16K31/06 ,  F25B41/00

Abstract: A flow control valve, comprising: a valve body (21), the valve body (21) having a valve seat part (211) provided therein, with a valve port (112) formed in the valve seat part (211); a spool (12), the spool (12) being axially movable to open or close the valve port (112), with a pressure-equalizing channel (121) provided in the spool (12), the pressure-equalizing channel connecting the valve port (112) and a back-pressure chamber (14), wherein the spool (12) has a substantially cylindrical lower end (222), and a conical hole (223) is formed in the spool (12), the conical hole (223) forming part of the pressure-equalizing channel (121), a bottom end of the conical hole (223) being located on a bottom plane (224) of the lower end (222), and the ratio of the diameter of the bottom end of the conical hole (223) to the diameter of the lower end (222) being greater than 0.88. In the present application, the conical hole (223) is provided on the spool (12) of the flow control valve, the conical hole (223) forming part of the pressure-equalizing channel (121), with the bottom end of the conical hole (223) being located on the bottom plane (224) of the lower end (222) of the spool (12). The conical hole (223) is dimensioned so that the pressure distributed at a lower part of the spool (12) becomes uniform, so as to balance fluid pressures in the back-pressure chamber (14) and the valve port (112).

公开(公告)号：EP4343180A1

公开(公告)日：2024-03-27

申请号：EP22803816.2

申请日：2022-05-09

Applicant: Danfoss A/S

Inventor： WU, Jiang ,  PEDERSEN, Anders ,  BAO, Jinfeng

IPC: F16K1/00 ,  F16K21/00

Abstract: Provided is a flow control valve (1). The flow control valve (1) comprises: a valve body (2), which is provided with a valve hole (21), a guide hole (22) and a lateral hole (23) that are in communication with each other; and a valve core (3), which is located in the guide hole (22), and can move in an axial direction of the guide hole (22) to control the opening and closing of the valve hole (21 ), thereby allowing or blocking the flowing of a fluid between the valve hole (21) and the lateral hole (23). The lateral hole (23) is internally provided with a connecting portion (231) connected to the valve hole (21), and the connecting portion (231) has a borehole surface (232) bored around an axis of the valve hole (21). The valve body (2) of the flow control valve (1) is provided with the lateral hole (23) and the borehole surface (232) located in the lateral hole (23), and the borehole surface (232) is located at a joint between the lateral hole (23) and the valve hole (21) and is arranged around the axis of the valve hole (21). By means of the lateral bore (23) and the borehole surface (232), the valve core (3) of the flow control valve (1) has as little lateral force as possible when a fluid flows between the valve hole (21) and the lateral hole (23).