发明名称 |
Valve with circulation timer |
摘要 |
A mounting for a valve to record the duration of time during which circulation under pressure passes through the valve in which a timer and a battery circuit for the timer is mounted in the valve in a removable container carrying a magnetic switch for the battery circuit and a trigger mechanism to close the switch when circulation through the valve occurs.
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申请公布号 |
US4476894(A) |
申请公布日期 |
1984.10.16 |
申请号 |
US19820391412 |
申请日期 |
1982.06.23 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
ALDER, ROBERT L. |
分类号 |
E21B21/10;F16K37/00;(IPC1-7):F16K37/00 |
主分类号 |
E21B21/10 |
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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