Noise reduction relief valve for cryogenic liquid containers

A relief valve for coupling to a relief port of a container, wherein the relief port has a port central axis, the relief valve comprising:

• a valve body forming an internal chamber and having a valve central axis, a proximal end and a distal end, wherein the valve central axis is angled at a non-zero angle between 0 and 30 degrees with respect to the port central axis;
• an inlet portion located at the proximal end of the valve body and configured to be connected to the internal chamber and to receive content flow from the container;
• a spring and a moveable poppet assembly disposed in the internal chamber, wherein a spring force exerted by the spring biases the poppet towards the inlet portion;
• and
• a cap configured to be connected to the distal end of the valve body, the cap comprising a plurality of passages for fluid flow, wherein each of the plurality of passages has a separate passage axis that is generally perpendicular to the valve central axis, and the cap precludes fluid flow in the direction of the valve central axis.

A pressurized container assembly comprising:

• a pressurized tank comprising an internal volume and a relief port connected to the internal volume, the relief port having a port central axis;
• and
• a relief valve configured to couple to the relief port, the relief valve comprising:
• a valve body forming an internal chamber and having a valve central axis, a proximal end and a distal end, wherein the valve central axis is angled at a non-zero angle with respect to the port central axis;
• an inlet portion located at the proximal end of the valve body and configured to be connected to the internal chamber and to receive content flow from the pressurized tank;
• a spring and a moveable poppet assembly disposed in the internal chamber, wherein a spring force exerted by the spring biases the poppet assembly towards the inlet portion, and wherein the poppet assembly comprises a seat disc configured to engage with a valve seat in the internal chamber to close the relief valve when the spring force exceeds a container pressure within the container;
• an adjustable spring top disposed in the internal chamber and in contact with the spring and configured to move towards and away from the inlet portion to increase and decrease, respectively, the spring force exerted by the spring onto the seat disc, the adjustable spring top comprising a fluid passage;
• and
• a cap configured to be connected to the distal end of the valve body, the cap comprising a plurality of passages for fluid flow, wherein each of the plurality of passages has a separate passage axis that is generally perpendicular to the valve central axis, and wherein the cap further comprises structure to preclude fluid flow in the direction of the valve central axis.

A valve comprising:

• a valve body defining an internal chamber, a central axis, a proximal end, and a distal end, the valve body comprising an inlet portion located at the proximal end thereof, the inlet portion configured to fluidly communicate with the internal chamber and to receive fluid from a source;
• a spring biasing a moveable poppet;
• an adjustable spring top disposed in the internal chamber and engaged with the spring opposite the moveable poppet, the adjustable spring top comprising a fluid passage;
• and
• a cap connected to the valve body, the cap defining (a) a plurality of fluid passages, each of the plurality of fluid passages having a respective fluid passage axis, each of the fluid passage axes being generally perpendicular to the central axis and (b) a conical void in fluid communication with the plurality of fluid passages.