Abstract: The tamper evident closure of the present invention includes a twist cap made of plastic that comprises a top portion and an interior sealing means which coacts with the rim of the container neck to provide a gas-tight seal. The top portion also has an annular depending skirt which includes an interior retaining means to coact with an exterior retaining means on the neck finish of the container. The exterior retaining means of the container has a positive stopping means to coact with interior retaining means of the cap so that when the cap is screwed onto the container neck the positive stopping means is engaged at a predetermined level of sealing force and capping torque. The depending skirt also includes locking means which lock the cap into place after the container is sealed. The locking means coacts with the positive stopping means on the container to prevent the cap from being unscrewed or twisted off the container after it has been screwed onto the container neck.

Abstract: The present invention relates to valve constructions which allows two different flow rates to pass through said valve, whether by two separate control signals or by one control signal and the second flow rate being attained automatically or inherently after the first flow rate has passed through the valve. The invention also includes a filter material cleaning system and a method of operating a filter material cleaning system which utilizes this valve but which helps to prevent the factors which would cause the re-deposition of the filtered particulate material whether onto the row of filter bags being cleaned, and or an adjacent row to the row being cleaned or two adjacent rows to the row being cleaned.