Patent ID: 6142167
Filing Date: 2000-11-07
Classification: F16K,Y10T

Abstract:
A liquid storage tank normally oriented in an upright position and being capable of rolling over through an angle greater than an angle at which liquid stored the tank can contact the top of the tank interior, said tank comprising:a venting and roll over shut-off valve assembly mounted at or near the top of the tank and having a passageway communicating between the tank interior and tank exterior and a vent valve subassembly which when in a normally closed position blocks air or vapor communication through said passageway and which moves to at least one open position in response to the tank vapor pressure and exterior tank atmospheric pressure being greater than a predetermined absolute value to permit air or vapor communication through said passageway, anda roll over shut-off valve preventing stored liquid from entering said passageway when the tank rolls more than a predetermined angle from the upright position,said assembly including a housing defining said passageway and said shut-off valve assembly is arranged below said passageway and said subassembly,said shut-off valve assembly including a shut-off valve moveable between a fully open and fully closed position and toward and away from said passageway, anda rocker arm mounted to said housing at a fixed rotation axis for rotation in the tank roll direction between a normal upright open position and a fully closed angular position, said rocker arm having a top portion above the rotation axis for moving said shut-off valve in response to the angular roll of the tank away from the tank upright position.