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Your position now:Nera Petroleum Mechanical Manufacture Co., Ltd > The drilling tool > Float Valve > New Style of Drill pipe Float Valve
New Style of Drill pipe Float Valve



1.General Information
Float valve is short for drill pipe float valve, which is a full size inside BOP within the drilling tools.
Compared with the old style, there is the interchangeable core assembly in the new style of the float valve. It can meet API standard.

2.  Models and Symbols

2.1. Classification


Table 1. Main parametersú║



3. Working Principle
When drilling fluid is circulating normally, the drilling fluid pushes the piston to compress spring. As it moves to a certain position, three holes of the splitter which were sealed by piston are open.  At the same time, the drilling fluid flow through the borehole of the piston to the neck nozzle. Because of the pressure of the neck nozzle, the spring always is pressed and the control valve is in open status. When the pump is turned down, the piston which is pressed by the spring will be in the same position as it is. The access port of the splitter is closed by the piston and the inner hole of the drill string is closed. The fluid in the annular space caní»t flow into the drill string.  
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