Safety shutdown circuit for pneumatic pump system

A pneumatic pump system, comprising:

• means for pumping liquid from an upstream location to a downstream location comprising a pneumatic pump cylinder and reciprocating piston apparatus for drawing said liquid into a liquid pump cylinder as said piston apparatus is retracted and urging said liquid out of said liquid pump cylinder as said piston apparatus is extended;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke from said retracted position to said extended position is less than a predetermined time interval, wherein said pneumatic circuit means comprises means for temporarily storing compressed air.

A pneumatic pump system, comprising:

• means for pumping liquid from an upstream location to a downstream location, comprising a pneumatic pump cylinder and reciprocating piston apparatus for drawing said liquid into a liquid pump cylinder as said piston apparatus is retracted and urging said liquid out of said liquid pump cylinder as said piston apparatus is extended;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke from said retracted position to said extended position is less than a predetermined time interval, wherein said pneumatic circuit means comprises pneumatic timer means for determining said predetermined time interval.

A pneumatic pump system, comprising:

• means for pumping liquid from an upstream location to a downstream location, comprising a pneumatic pump cylinder and reciprocating piston apparatus for drawing said liquid into a liquid pump cylinder as said piston apparatus is retracted and urging said liquid out of said liquid pump cylinder as said piston apparatus is extended;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke from said retracted position to said extended position is less than a predetermined time interval, wherein said pneumatic circuit means comprises pneumatic timer means for determining said predetermined time interval and wherein said pneumatic timer means comprises a timing orifice and volume chamber, said volume chamber being adapted to receive compressed air passing through said timing orifice.

A pneumatic pump system, comprising:

• means for pumping liquid from an upstream location to a downstream location, comprising a pneumatic pump cylinder and reciprocating piston apparatus for drawing said liquid into a liquid pump cylinder as said piston apparatus is retracted and urging said liquid out of said liquid pump cylinder as said piston apparatus is extended;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke from said retracted position to said extended position is less than a time interval which is determined by selecting a capacity for compressed air storage means prior to activation of said system.

A pump system, comprising:

• means for pumping fluid, comprising a reciprocating piston apparatus for drawing fluid into a pump cylinder and urging said fluid out of said pump cylinder;
• and
• pneumatic circuit means for deactivating said piston apparatus if the time period for said piston apparatus to travel a stroke is less than a time interval which is determined by selecting a capacity for compressed air storage means prior to activation of said system.

A pump system, comprising:

• means for pumping fluid, comprising a reciprocating piston apparatus for drawing fluid into a pump cylinder and urging said fluid out of said pump cylinder;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke is less than a predetermined time interval, wherein said pneumatic circuit means comprises means for temporarily storing compressed air.

A pump system, comprising:

• means for pumping fluid, comprising a reciprocating piston apparatus for drawing fluid into a pump cylinder and urging said fluid out of said pump cylinder;
• and
• pneumatic circuit means for deactivating said piston apparatus if the period of time for said piston apparatus to travel a stroke is less than a predetermined time interval, wherein said pneumatic circuit means comprises pneumatic timer means for determining said predetermined time interval.