Drive device and method of controlling the same
US-2024392530-A1 · Nov 28, 2024 · US
Flow control valve for construction machinery
US9309901B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9309901-B2 |
| Application number | US-201114130271-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 12, 2011 |
| Priority date | Jul 12, 2011 |
| Publication date | Apr 12, 2016 |
| Grant date | Apr 12, 2016 |
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- Title
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- Abstract
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- First independent claim
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- CPC / IPC classifications
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Abstract
Official abstract text for this publication.
A flow control valve for a construction machine is disclosed, which enables a combined operation for simultaneously operating a working device, such as an arm, and a swing device to be easily performed by limiting a part of hydraulic fluid that is supplied to the working device side by a priority valve that is shifted simultaneously or releasing the limiting function through shifting of a spool of the priority valve to a neutral position by pilot signal pressure that is separately applied according to a type of work.
First claim
Opening claim text (preview).
The invention claimed is: 1. A flow control valve for a construction machine configured to control hydraulic fluid that is distributed and supplied from a hydraulic pump to a hydraulic actuator and a swing device, comprising: a valve block in which a pump path connected to the hydraulic pump and connection ports communicating with the hydraulic actuator are formed; a spool slidably installed inside the valve block and shifted according to pilot signal pressure applied thereto to control hydraulic fluid that is supplied from the pump path connected to the swing device side to the connection port side; a priority valve mounted on the valve block to limit a flow rate that is supplied from the pump path to the connection port side when the control spool is shifted according to applied pilot signal pressure of the swing device side; and a piston slidably installed inside a sleeve that is mounted on the priority valve and shifted according to applied pilot signal pressure to shift the control spool to a neutral position so as to release the function of limiting the hydraulic fluid that is supplied from the pump path to the connection port side.
Assignees
Inventors
Classifications
for linearly sliding valves, e.g. spool valves · CPC title
with electrically-controlled pilot valves · CPC title
- E02F9/2267Primary
Valves or distributors (position of valves arrangements on upper-structures E02F9/0875) · CPC title
Pilot or servo controlled · CPC title
- F15B13/06Primary
for use with two or more servomotors · CPC title
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Frequently asked questions
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- What does patent US9309901B2 cover?
- A flow control valve for a construction machine is disclosed, which enables a combined operation for simultaneously operating a working device, such as an arm, and a swing device to be easily performed by limiting a part of hydraulic fluid that is supplied to the working device side by a priority valve that is shifted simultaneously or releasing the limiting function through shifting of a spool…
- Who is the assignee on this patent?
- Ku Bon-Seuk, Volvo Constr Equip Ab
- What technology area does this patent fall under?
- Primary CPC classification E02F9/2267. Mapped technology areas include Fixed Constructions.
- When was this patent published?
- Publication date Tue Apr 12 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).