CUSHION VALVE
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United States of America Patent
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N/A
Issued Date -
May 28, 2015
app pub date -
Mar 7, 2014
filing date -
Mar 21, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A cushion valve includes a housing having a pair of primary chambers and a pair of secondary chambers. A first spool and a pair of second spools are arranged in the housing. Biasing members are respectively arranged between the first spool and the second spool and between the first spool and the second spool. A first internal passage communicating with a tank port is formed at the first spool. Each of the second spools includes a land portion configured to open or close an opening formed between the primary chamber and the corresponding secondary chamber. A second internal passage including a restrictor is formed at each of the second spools. When one of the second spools moves toward the first spool, the first internal passage communicates with the secondary chamber located at the other second spool side.
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