发明名称 |
Fail safe apparatus for a direct-drive servovalve |
摘要 |
Provided is a servovalve system having a fail safe apparatus adapted for switching the servovalve system between an operating position and a fail safe position. The servovalve system comprises a housing having a housing bore and a housing chamber, a spool moveably disposed within the housing, and a stepper motor connected to the spool and configured to vary the spool position for manipulating the fluid flowing within a fluid circuit when the servovalve system is placed in the operating position. A rotary-linear converter converts rotational motion of the stepper motor into axial motion of the spool. The fail safe apparatus includes a piston slidably sealed within the housing chamber and mechanically coupled to the rotary-linear converter. The piston is operative to move the spool from the operating position to the fail safe position upon a loss of fluid pressure in the housing chamber.
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申请公布号 |
US2004238051(A1) |
申请公布日期 |
2004.12.02 |
申请号 |
US20030741026 |
申请日期 |
2003.12.19 |
申请人 |
TRANOVICH STEPHEN J.;TRUIA IULIANA G. |
发明人 |
TRANOVICH STEPHEN J.;TRUIA IULIANA G. |
分类号 |
F15B13/04;F15B13/044;F15B20/00;F16K27/04;F16K31/04;(IPC1-7):F15B13/044 |
主分类号 |
F15B13/04 |
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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