Closed granular chemical handling system

A dispensing valve comprising:

• a housing attachable to a dispensing container, and having a passage and a first valve seat;
• a first valve member slidably mounted in said housing and having an edge which sealingly engages said first valve seal in said housing in a closed position to block the passage;
• means for biassing said first valve member into the closed position;
• means for rotatably coupling the housing to a first part of a receiving valve;
• and
• means for engaging a second, movable part of the receiving valve to automatically open the receiving valve as the dispensing valve is coupled to the receiving valve and enabling automatic closure of the receiving valve when the dispensing valve is uncoupled from the receiving valve, said first valve member being driven both axially and rotationally relative to said housing during coupling and uncoupling.

A dispensing valve comprising:

• a housing attachable to a dispensing container, and having a passage and a first valve seat;
• a first valve member slidably mounted in said housing and having an edge which sealingly engages said first valve seat in said housing in a closed position to block the passage, said first valve member being capable of both axial and rotational movement relative to said housing;
• means for biassing said first valve member into the closed position;
• means for rotatably coupling the housing to a first part of a receiving valve;
• and
• means for engaging a second, movable part of the receiving valve to automatically open the receiving valve as the dispensing valve is coupled to the receiving valve and enabling automatic closure of the receiving valve when the dispensing valve is uncoupled from the receiving valve, said first valve member including at least one locking projection for engaging a cooperating part of the receiving valve to generate rotation of said first valve member relative to said housing when said dispensing valve is rotated when coupled to and uncoupled from the receiving valve.