Mud valve
This patent describes an improved mud saver valve of the type comprising a tubular body connectable between a kelly and a drill string and a piston axially movable within the tubular body forming a valve seat and incorporating a plug removably mounted therein to normally close the bore with the piston being biased into engagement with the valve seat for the closure thereof, the improvement comprising: the tubular body being formed of upper and lower tubular sections; an upper valve seat formed in a lower region of the upper tubular body section and constructed with a generally cylindrical, curved valve seating recess therearound; the piston being constructed with a lower valve seat member in an upper end thereof adapted for matingly engaging the upper valve seat member and formed with a generally cylindrical, curved edge portion adapted for matingly engaging the curved recess of the upper valve seat; the piston being formed with a generally cylindrical, elongate intermediate body portion comprising a flange region adapted for receipt in, axial alignment with, and slidable engagement through the lower tubular member for facilitating the axial alignment and lateral stability of the upper and lower valve seats; and means for coupling the upper and lower tubular sections one to the other for the engagement of the upper and lower valve seats disposed thereon.
- Assignee:
- NOV; EDB-87-101345; NOV-87-058359
- Patent Number(s):
- US 4658905
- OSTI ID:
- 6469409
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ALIGNMENT
CLOSURES
CONDUCTOR DEVICES
CONNECTORS
CONTROL EQUIPMENT
DRILL BITS
DRILL PIPES
DRILLING EQUIPMENT
DRILLING FLUIDS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLANGES
FLOW REGULATORS
FLUIDS
NATURAL GAS WELLS
OIL WELLS
PIPES
PISTONS
VALVES
WELLS