Open AccessEffect Analysis of Leakage in the Middle Position and Improvement of an O-type 3-position-4-way Directional Valve with the Spool Structure
Author(s) -
Xuyao Mao,
Chao Wu,
Hongyuan Ding,
Bin Li,
Yiou Liu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/508/1/012160
Subject(s) - leakage (economics) , position (finance) , actuator , correctness , engineering , control theory (sociology) , structural engineering , computer science , electrical engineering , artificial intelligence , control (management) , finance , economics , macroeconomics , programming language
Although the middle position of the O-type 3-position-4-way directional valve with the spool structure is not the working position of the valve, the performance of the middle position is also one of the considerations in the system design. The leakage characteristics of the middle position affect the correctness of the final action of the external load. Leakage effects of the middle position on the action of load under 3 common working conditions were analysed. The results showed that the position of the load actuator moved towards the load direction because of the leakage. The larger the leakage, the faster the response, and the faster the moving speed; the different gaps between different valve ports aggravated the previous phenomenon. The use of a pair of pilot-operated check valves in series and a parallel bypass valve at the inlet and outlet of the actuator could effectively improve the actual cut-off effect of the directional valve.