发明名称 |
Pump unloading valve for use in agricultural tractor lift systems |
摘要 |
An unloading valve spool with a tapered nose section is urged across a pair of unloading ports at a controlled rate eliminating violent upstream pressure generation. The unloading valve is subjected to equal system fluid pressure on each side of it as the spool is provided with a through passage that is dead headed on the back side of the unloading spool. A return spring urges the unloading spool to a normally closed position. An unloading piston prevents the unloading spool from closing too rapidly preventing the generation of a significant upstream pressure spike.
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申请公布号 |
US4141283(A) |
申请公布日期 |
1979.02.27 |
申请号 |
US19770820520 |
申请日期 |
1977.08.01 |
申请人 |
INTERNATIONAL HARVESTER COMPANY |
发明人 |
SWANSON, WILLIAM C.;GALOS, IMRE |
分类号 |
F15B13/02;(IPC1-7):F15B11/08;F16K31/12 |
主分类号 |
F15B13/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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