发明名称 |
Válvula de pressão aperfeiçoada |
摘要 |
<p>A pressure valve assembly for use in gas-lift producing oil-wells includes a cylindrical body, a first pressure chamber including bellows located in the body, a second pressure chamber in the body having a first port for communication with gas pressure in a lining or casing, a second port for communicating the second chamber with a pipe in the lining, a valve stem connected to the bellows for movement in the second chamber and a gate valve assembly connected to the stem in the second chamber for controlling the gas flow between the first and second ports.</p> |
申请公布号 |
BR9300293(A) |
申请公布日期 |
1994.08.16 |
申请号 |
BR19939300293 |
申请日期 |
1993.01.27 |
申请人 |
PETROLEO BRASILEIRO S/A - PETROBRAS |
发明人 |
ALCINO RESENDE DE ALMEIDA |
分类号 |
E21B43/12;(IPC1-7):E21B34/06 |
主分类号 |
E21B43/12 |
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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