<p>A gate valve with a port, groove, undercut or other pressure relief means in the gate to facilitate unidirectional sealing when the gate is in one of its closed positions, and bi-directional sealing when the gate is in its other closed position.</p>
申请公布号
DE3586890(D1)
申请公布日期
1993.01.21
申请号
DE19853586890
申请日期
1985.10.22
申请人
FMC CORP., CHICAGO, ILL., US
发明人
WAFER, DON B., HOUSTON TEXAS 77092, US;BARRINGTON, CLAUD C., HOUSTON TEXAS 77008, US
