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MARCH |
World Oil EXPLORATION DRILLING PRODUCTION
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Hydraulically actuated valve opener. Dartt™ Valve Co., (Current
location: Flint), Texas, offers a special metal insert which-in its location
directly below, and within a housing connnected to the traveling valve-is
exposed to fluid movements as the pump plunger travels up and down.The solid
insert features two "hydraulic amplifiers" that contact the wall of
the housing and are moved upward within the housing on the downstroke by hydraulic
pressure, into enlarged passage- ways in the housing wall that then allow
fluid bypass, Fig. 6. In the same motion, the angled upper tip of the insert
is driven upward to contact and physically unseat the travelling valve ball.
This action thus helps open the valve and prevent gas locking. The second feature of the insert is that on the upstroke, it is moved downward within the housing past the fluid bypasses such that each of the two enlarged diameters sealingly contact the housing wall. This creates multiple secondary seals to backup the traveling valve should it be lodged open by sand. The Dartt valve is installed in the bottom of the conventional double female traveling valve cage by removing the plug that retains the ball and seat, i.e., the unit replaces that plug and is tightened in the same manner as cages. |
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