초록 ▼

A blow molded drum has a port including a neck with exterior buttress threads and a port opening having a sleeve fusion bonded in the neck. The sleeve having a inner cylindrical sealing surface, and a shoulder. A drop-in down tube assembly seats with the shoulder and has an upwardly extending nipple

A blow molded drum has a port including a neck with exterior buttress threads and a port opening having a sleeve fusion bonded in the neck. The sleeve having a inner cylindrical sealing surface, and a shoulder. A drop-in down tube assembly seats with the shoulder and has an upwardly extending nipple. Either a dispense head or a closure radially seals within the sleeve and is secured by a retainer with interior buttress threads engaging with the exterior threads on the port neck. The dispense head has a first flow duct extending to a nipple engaging portion to seal with the upwardly extending nipple and a second flow duct leading to an annular space around the nipple for a return fluid line or for providing air or a gas for displacing withdrawn fluid. The closure is preferably comprised of a cylindrically shaped interior liner portion for engaging and sealing with the cylindrical sealing surface of the sleeve, such as by an o-ring, and has a pathway which includes the spiral gap between the cooperating buttress threads on the neck and on the retainer. A microporous membrane may be placed in the pathway to allow venting of gases but preclude leakage of the liquid in the drum.

대표청구항 ▼

[ What is claimed is:] [1.] A containment system comprising:a plastic drum having a generally flat top and a generally flat bottom, the top having a port with a port opening and a neck portion extending upwardly from the top and integral therewith, the neck portion having exterior threads;a plastic

[ What is claimed is:] [1.] A containment system comprising:a plastic drum having a generally flat top and a generally flat bottom, the top having a port with a port opening and a neck portion extending upwardly from the top and integral therewith, the neck portion having exterior threads;a plastic sleeve positioned in the neck portion and sealingly engaged therewith, the sleeve having an inner cylindrical periphery including an o-ring sealing surface and a shoulder extending inwardly from said inner cylindrical periphery below and displaced from the o-ring sealing surface;a down tube assembly consisting of a down tube sized to extend down toward the bottom of said drum, an upwardly extending nipple, the down tube and nipple having a bore extending therethrough, the nipple connecting with said down tube, and an annular support member extending radially from the nipple with a circular periphery sized to seat on the shoulder, the support member having at least one annular passage, the down tube assembly configured such that said assembly is insertable downwardly into the port opening such that the circular periphery seats on said shoulder positioning the nipple to extend upwardly in the cylindrical sleeve and fixing the position of said down tube assembly; anda port fitting assemblage engageable on said port, said assemblage having a body with a circular periphery sized to the inner cylindrical periphery of the sleeve, an o-ring extending around the body for sealing with the cylindrical periphery, a retaining member rotatable with respect to said body, the retaining member having inwardly extending threads sized for engagement with the threads on the exterior of the neck portion.