发明名称 |
Pilot operated valve positioner |
摘要 |
A pilot operated valve positioner having a pilot valve unit operated by a pneumatic signal to pneumatically operate an actuator unit carrying a main valve member to position the same relative to its main valve seat in a valve unit in relation to the magnitude of the pneumatic signal, the actuator unit having a range spring and a feedback spring for the pilot valve unit. The springs are coiled compression springs and are substantially concentrically mounted. The pilot valve unit has a feedback positioning diaphragm and part of its housing concentrically disposed in one end of the range spring to render the valve positioner relatively small and compact.
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申请公布号 |
US4143850(A) |
申请公布日期 |
1979.03.13 |
申请号 |
US19770800299 |
申请日期 |
1977.05.25 |
申请人 |
ROBERTSHAW CONTROLS COMPANY |
发明人 |
BRAKEBILL, HAROLD G. |
分类号 |
F16K31/128;(IPC1-7):F16K31/12;F15B13/16 |
主分类号 |
F16K31/128 |
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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