Self-closing valve with adjustable activation

Abstract

The valve ( 1 ) exhibits an external body ( 2 ) affording an internal cavity ( 3 ) which terminates externally of the external body ( 2 ) with an outlet section ( 4 ) and an inlet section ( 5 ). A piston ( 7 ) is slidingly and sealedly housed inside the cavity ( 3 ), and defines a first chamber ( 8 ) and a second chamber ( 9 ) therein. The piston ( 7 ) internally exhibits a channel ( 11 ) communicating with the first chamber ( 8 ), through a first hole ( 12 ), and the second chamber ( 9 ), through a second hole ( 13 ). Internally of the channel ( 11 ) the piston ( 7 ) exhibits means for intercepting the fluid ( 15 ) for slowing fluid passage from the first chamber ( 8 ) to the second chamber ( 9 ).

1 ). A self-closing valve with adjustable activation, comprising: an external body ( 2 ) developing along an axis X-X, internally exhibiting a cavity ( 3 ) which terminates externally of the external body ( 2 ) in an outlet section ( 4 ) and an inlet section ( 5 ); 
 a piston ( 7 ), slidable along the axis (X-X) in the cavity ( 3 ) from a rest position, in which the piston ( 7 ) permits exit of fluid from the outlet section ( 4 ), to a closed position in which passage of fluid into the outlet section ( 4 ) is prevented, which piston ( 7 ) defines internally of the cavity ( 3 ) a first chamber ( 8 ) located downstream of the piston ( 7 ) and a second chamber ( 9 ) located upstream of the piston ( 7 ), which piston is actuated by viscous forces, by elastic means ( 10 ) and by a pressure difference for closing or opening the outlet section ( 4 ), and which piston ( 7 ) is internally provided with a channel ( 11 ) set between and in communication with the first chamber ( 8 ) and the second chamber ( 9 );    characterised in that the piston ( 7 ) comprises:    a stem ( 14 ), preferably conical, positioned in the outlet section ( 4 ); means for intercepting ( 15 ) the fluid, acting on the channel ( 11 ) for slowing the passage of fluid from the first chamber ( 8 ) to the second chamber ( 9 ).    
   
   
       2 ). The valve of  claim 1 , characterised in that the means for intercepting ( 15 ) the fluid are defined by a cylindrical body ( 24 ) coupled with play internally of the channel ( 11 ).  
   
   
       3 ). The valve of  claim 1 , characterised in that the channel ( 11 ) is defined by a first tract ( 22 ) having an axis which is parallel to the axis (X-X), and a first hole ( 12 ) and a second hole ( 13 ), each of which first hole ( 12 ) and second hole ( 13 ) develops transversally to the axis (X-X), and which first hole ( 12 ) enables hydraulic communication between the first chamber ( 8 ) and the first tract ( 22 ) and which second hole ( 13 ) enables hydraulic communication between the second chamber ( 9 ) and the first tract ( 22 ).  
   
   
       4 ). The valve of  claim 1 , characterised in that the external body ( 2 ) exhibits, opposite the outlet section ( 4 ), a cap ( 6 ) facing the second chamber ( 9 ) and being connectable thereto by means of a threaded coupling.  
   
   
       5 ). The valve of  claim 1 , characterised in that the first chamber ( 8 ) is in communication with the inlet section ( 5 ) and the outlet section ( 4 ).  
   
   
       6 ). The valve of  claim 1 , characterised in that the elastic means ( 10 ), which act on the piston ( 7 ) and which are located in the first chamber ( 8 ), exhibit an end which strikes against the piston ( 7 ) and an opposite end which strikes on the outlet section ( 4 ).  
   
   
       7 ). The valve of  claim 1 , characterised in that the outlet section ( 4 ) exhibits a seating ( 19 ) in which a striker element ( 20 ) is housed, having a hole ( 21 ) which is coaxial to the first tract ( 22 ) and which enables communication between the outlet section ( 4 ) and the first chamber ( 8 ).  
   
   
       8 ). The valve of  claim 7 , characterised in that the seating ( 19 ) also includes an increase in section ( 25 ) on which an annular body ( 18 ) is housed in contact with the striker element ( 20 ) and facing the first chamber ( 8 ), which annular body has a smaller internal diameter than an external diameter of the striker element ( 20 ).  
   
   
       9 ). The valve of  claim 8 , characterised in that the elastic means ( 10 ) positioned in the first chamber ( 8 ) and acting on the piston ( 7 ) are defined by a spring ( 26 ) exhibiting a first end ( 26   a ) striking against the annular body ( 18 ) and a second end ( 26   b ) which strikes against the piston ( 7 ).  
   
   
       10 ). The valve of  claim 7 , characterised in that the piston ( 7 ), when located in the rest position, exhibits a projection ( 27 ) which is distanced from the seating ( 28 ) while the stem ( 14 ) is against the striker element ( 20 ), partially occluding the hole ( 21 ).  
   
   
       11 ). The valve of  claim 7 , characterised in that the piston ( 7 ), when located in the closed position, exhibits the projection ( 27 ) striking against the seating ( 28 ) and the stem ( 14 ) totally occluding the hole ( 21 ).  
   
   
       12 ). The valve of  claim 3 , characterised in that the first hole ( 12 ) and the second hole ( 13 ) pass through the piston ( 7 ) and are transversally oriented with respect to the first tract ( 22 ).  
   
   
       13 ). A hydraulic circuit for dispensing a pressurised fluid, comprising: a motor ( 30 ) powering a pump ( 31 ), which pump ( 31 ) is connected upstream with a water delivery pipe ( 32 ); 
 a traditional by-pass valve ( 34 ), connected downstream of the pump ( 31 ) via a first pipe ( 33 ), which by-pass valve ( 34 ) exhibits a by-pass conduit ( 36 ) connected to the water delivery pipe ( 32 ) and hydraulically connected to a fluid dispenser device ( 35 );    characterised in that it comprises the self-closing valve ( 1 ) with adjustable activation of  claim 1 , which valve ( 1 ) is connected upstream to the first pipe ( 33 ) via a second by-pass conduit ( 37 ), the valve ( 1 ) being connected in parallel to the traditional by-pass valve ( 34 ).    
   
   
       14 ). A hydraulic circuit for dispensing a pressurised liquid, comprising: 
 a motor ( 30 ) powering a pump ( 31 ), which pump ( 31 ) is connected upstream with a water delivery pipe ( 32 );    a flow sensitive valve ( 34 ′), connected downstream of the pump ( 31 ) via a first pipe ( 33 ), which flow sensitive valve ( 34 ′) exhibits a by-pass conduit ( 36 ) connected to the water delivery pipe ( 32 ) and hydraulically connected to a fluid dispenser device ( 35 );    characterised in that it comprises the self-closing valve ( 1 ) with adjustable activation of  claim 1 , which valve ( 1 ) is hydraulically interpositioned between the flow sensitive valve ( 34 ′) and the fluid dispenser device ( 35 ), and which valve exhibits a second by-pass conduit ( 37 ) connected to the delivery pipe ( 32 ), the self-closing valve ( 1 ) with adjustable activation being connected in series with the flow sensitive valve ( 34 ′).