Compensating device for volumetric pumps

Abstract

A compensating device for volumetric pumps, comprising: a storage tank (2) predisposed for being connected to the delivery line (O) of a pump (P) and to a source of pressurized gas (A); a control valve (3) arranged for opening or closing the connection between the tank (2) and the source of pressurized gas (A); a control module (4) connected to the control valve (3). The device comprises a level sensor (5) associated with the tank (2) for detecting a threshold level for a liquid within the tank (2) and connected to the control module (4) for transmitting to the module (4) at least one operating signal indicating a liquid level higher than the threshold level. The control module (4) is configured to determine the opening of the control valve (3) in the presence of said operating signal and to determine the closing of the control valve (3) in the absence of said operating signal.

1 . A compensating device for volumetric pumps, comprising: a storage tank ( 2 ), predisposed for being connected to the delivery line (O) of a pump (P) and to a source of pressurized gas (A); a control valve ( 3 ), arranged for opening or closing the connection between the tank ( 2 ) and the source of pressurized gas (A); a control module ( 4 ), connected to the control valve ( 3 );
 characterized in that:   it includes a level sensor ( 5 ) associated with the tank ( 2 ) for detecting a threshold level for a liquid within the tank ( 2 ) and connected to the control module ( 4 ) for transmitting to said module ( 4 ) at least one operating signal indicating a liquid level higher than the threshold level;   the control module ( 4 ) is configured so as to determine the opening of the control valve ( 3 ) in the presence of said operating signal and to determine the closing of the control valve ( 3 ) in the absence of said operating signal.   
     
     
         2 . The compensating device according to  claim 1 , wherein the sensor ( 5 ) is structured so as to directly measure the level of the liquid inside the tank ( 2 ). 
     
     
         3 . The compensating device according to  claim 1 , wherein at least one part or one zone of the sensor ( 5 ) is placed in contact with or can enter into direct contact with the liquid inside the tank ( 2 ). 
     
     
         4 . The compensating device according to  claim 1 , wherein the level sensor ( 5 ) is a capacitive sensor. 
     
     
         5 . A control method for a storage tank ( 2 ) predisposed for being connected to the delivery line ( 0 ) of a pump (P), comprising the following steps:
 detecting the level of liquid inside the storage tank ( 2 );   if the level of liquid is higher than a threshold level, allowing the feeding of pressurized gas to the tank ( 2 );   if the liquid level is lower than the threshold level, preventing the feeding of pressurized gas to the tank ( 2 )   
     
     
         6 . The method according to  claim 5 , wherein the liquid level is detected at predetermined time intervals.