A chemical supply system in which suction or delivery flow rate of chemical is controlled with high precision while troubles incident to heat generation is removed.

Also, at least one second suction hole is formed in the suction nozzle near the first suction hole so that the flow rate of the air sucked by the suction nozzle can be changed.

Xi – Best vacuum flow, with a final vacuum efficiency of around 95 % at deep vacuum levels.

The vacuum system has a vacuum head (36) and a vacuum nozzle (40).

Xi – Best vacuum flow and efficiency at deep vacuum levels, final vacuum level at approximately 95 %.

Having separate flow channels to the distal end of the suction irrigator allows the irrigation flow to be optimised for cleaning performance using high pressure low flow.

The suction disk has inside a cavity communicating with the air suction means, and an airflow member is provided on a suction surface of the suction disk.

A flow rate regulator unit (10) is attached to a housing (41) and to a suction tube (42).

An aspiration device (100) includes an aspiration unit (102) for extracting fluid from an aspiration site on a patient's body.

For each flow rate case, calculate the inlet velocity, V1, from the volumetric flow rate. where is the volume flow rate and W is the channel width.

undercapacity (up to 20% of the maximum value) entails a reduction in the efficiency of the intermediate suction device.

The air suction means is configured to allow the powder material to fall from the suction disk into the female mold when the air suction means stops sucking air.

The tube has a plurality of suction lumens (44) , each having a suction port (60) .

A second aspiration level, supplied by a second pump, may be automatically switched from the first aspiration level.

The surplus flow rate is the flow rate other than the recovery flow rate.