公开(公告)号：US20240263650A1

公开(公告)日：2024-08-08

申请号：US18562958

申请日：2022-08-03

Applicant: Komatsu Ltd.

Inventor： Satoshi Ishikawa ,  Junichi Fukushima ,  Keita Murakami ,  Masateru Hachisuka

IPC: F15B11/16 ,  F15B13/02 ,  F15B13/04

CPC classification number: F15B11/163 ,  F15B13/026 ,  F15B13/0405 ,  F15B2211/20546 ,  F15B2211/30535

Abstract: In a pressure compensation valve, a spool portion of a valve body is provided with a throttle passage that constantly communicates with a pump port. A case is provided with supply pressure communication passages to block space between the throttle passage and a load pressure chamber when a poppet portion closes space between the pump port and a cylinder port by biasing force of a load pressure spring, and that, meanwhile, communicate between the throttle passage and the load pressure chamber via a throttle hole when the spool portion moves in an opening direction by a predetermined stroke. A lead-out pressure chamber that presses the poppet portion in a closing direction in a case where an internal pressure increases is provided between the poppet portion and the case, and a lead-out pressure passage that constantly communicates with the cylinder port is connected to the lead-out pressure chamber.

公开(公告)号：US12173731B2

公开(公告)日：2024-12-24

申请号：US18562958

申请日：2022-08-03

Applicant: Komatsu Ltd.

Inventor： Satoshi Ishikawa ,  Junichi Fukushima ,  Keita Murakami ,  Masateru Hachisuka

IPC: F15B11/16 ,  F15B13/02 ,  F15B13/04

Abstract: In a pressure compensation valve, a spool portion of a valve body is provided with a throttle passage that constantly communicates with a pump port. A case is provided with supply pressure communication passages to block space between the throttle passage and a load pressure chamber when a poppet portion closes space between the pump port and a cylinder port by biasing force of a load pressure spring, and that, meanwhile, communicate between the throttle passage and the load pressure chamber via a throttle hole when the spool portion moves in an opening direction by a predetermined stroke. A lead-out pressure chamber that presses the poppet portion in a closing direction in a case where an internal pressure increases is provided between the poppet portion and the case, and a lead-out pressure passage that constantly communicates with the cylinder port is connected to the lead-out pressure chamber.