Safety check valve

Patent · Tue Feb 11 04:00:00 EST 1992

OSTI ID:5438348

Spears, H L

This patent describes a safety check valve, for use with a pumping unit for petroleum fluids, the pumping unit including a polished rod and a stuffing box. It comprises: a valve housing having upper and lower ends and a central bore extending between the upper and lower ends and adapted to have the polished rod pass through the central bore; a ball seating surface associated with the central bore; a non-spring bias ball; a ball housing for the ball and associated with the valve housing; and means for moving the ball from the ball housing into the central bore upon the polished rod not being disposed in the central bore, including a ball receiving cavity associated with the ball housing, the ball hoising having first and second ends, the first end of the ball housing being in communication with the central bore of the valve housing, the second end being closed; the ball receiving cavity having a ball support surface upon which the ball may rest, when the ball is disposed in the ball receiving cavity, the ball support surface sloping downwardly toward the first end of the ball housing, whereby if the polished rod is not disposed within the central bore of the valve housing, the ball moves down the ball support surface, under the force of gravity, from the ball receiving cavity into the central bore and seats on the ball seating surface.

• Assignee: NOV; NOV-92-025293; EDB-92-093875
• Patent Number(s): A; US 5086802
• Application Number: PPN: US 7-600671
• OSTI ID: 5438348
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
020600 -- Petroleum-- Health & Safety
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BALL BEARINGS
BEARINGS
CONTROL EQUIPMENT
DESIGN
DRILLING
EQUIPMENT
FLOW REGULATORS
OIL WELLS
PUMPING
SAFETY
VALVES
WELL DRILLING
WELLS