Double foot valve for cryogenic fluid containing tanks

Patent · Tue Jun 15 04:00:00 EDT 1976

OSTI ID:7359735

Kohnen, K

An improvement in an apparatus is described that is suited for removing liquid (e.g., flammable) from a bulk container. The equipment is comprised of pumping equipment in the container, a fluid transmitting casing extending from an upper portion in the container to a lower portion and communicating with the pumping equipment, an inlet communicating with the pumping equipment, a fluid outlet at the upper part of the container communicating with the casing, a foot valve for sealing the inlet from the container when in a closed position and permitting the fluid flow from the container through the inlet to the casing when in the open position. The foot valve is provided with a means responsive to lifting movement of the pumping equipment for closing it and a sealing gland at the top of the casing accommodating movement of the pumping equipment for permitting opening and closing of the foot valve without venting the casing. The improvement comprises a ''double foot valve'' comprising an inner poppet carrying a sealing surface and extending across said inlet for sealing engagement when in a closed position, and an outer poppet carrying a sealing surface and extending across the inlet for sealing engagement when in a closed position, the outer poppet carrying the inner poppet for independent axial movement.

• Assignee: Air Products and Chemicals, Inc.
• Patent Number(s): US 3963381
• OSTI ID: 7359735
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000* -- Natural Gas-- Transport
Handling
& Storage
CONTROL EQUIPMENT
CRYOPUMPS
DESIGN
ENERGY SOURCES
EQUIPMENT
FLOW REGULATORS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
LABORATORY EQUIPMENT
LIQUEFIED NATURAL GAS
LOW TEMPERATURE
NATURAL GAS
PUMPING
PUMPS
REMOVAL
STORAGE
VACUUM PUMPS
VALVES