Title:
SAFETY LOCK VALVE INCLUDING LOGIC VALVE CAPABLE OF PILOT PRESSURE SUPPLY CONTROL
Document Type and Number:
WIPO Patent Application WO/2023/195578
Kind Code:
A1
Abstract:
The present invention provides a safety lock valve in which: a main flow path is formed such that hydraulic oil flows between a cylinder unit for boom operation and a manipulation unit for manipulation; and an auxiliary flow path connected in parallel to the main flow path is formed. The safety lock valve is connected to a pilot line and a drain line, and comprises: a main spool installed in the main flow path to regulate the opening and closing of the main flow path; a relief valve that is installed in the main flow path and opens when a set pressure is reached or exceeded; an orifice valve that is installed in the main flow path and controls the main spool by means of discharge pressure from the surge pressure of the relief valve; and a logic valve that is installed in the auxiliary flow path and opens the auxiliary flow path from the main flow path using pilot pressure.
Inventors:
LIM SA HYUN (KR)
Application Number:
PCT/KR2022/008772
Publication Date:
October 12, 2023
Filing Date:
June 21, 2022
Export Citation:
Assignee:
DAEJIN HS CO LTD (KR)
International Classes:
E02F9/22; E02F3/43
Foreign References:
| KR102263246B1 | 2021-06-10 | |||
| JP2000220603A | 2000-08-08 | |||
| JP2003194008A | 2003-07-09 | |||
| KR100976924B1 | 2010-08-18 | |||
| JP2001263305A | 2001-09-26 |
Attorney, Agent or Firm:
PUKYUNG INTERNATIONAL PATENT & LAW FIRM (KR)
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