Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent
1988-03-02
1989-09-26
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
91167R, 92 62, 251 635, 251 636, 2512495, F16K 31143
Patent
active
048694584
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a valve for the distribution of a liquid. The invention specifically relates, although not exclusively so, to the filling of perfusion pouches or bags.
There are known machines for the manufacture of pouches or bags from a flexible film made from plastic material. More specifically, there are known machines for the manufacture of pouches or bags from a thermoplastic film. These machines include a series of stations at which the film is treated in succession. Generally, the film is unwound from a winder, then it is perforated Perpendicular to the perforation, ports or fitments are heat sealed by a welding head, the film is then shaped in a shaping device designed to fold the film back on itself in order to create an edge to edge seal. The film that has been sealed edge to edge forms a tube that is then heat sealed in the transverse direction at regular intervals to form individual pouches or bags. These individual pouches or bags are filled prior to the creation of the second transverse heat seal that forms the pouch or bag.
The present invention more specifically relates to a distribution valve for the liquid that fills the pouch or bag. In this respect, it will be noted that the pouch generally is filled from a constant level tank, or by a feeding circuit under constant pressure. The filling of the pouch or bag itself is done over a constant period of time, independent of the quantity of liquid to be introduced into the pouch or bag. Under those conditions, the final quantity of liquid contained in the pouch or bag depends on the opening section of the distribution valve.
There are known devices that have members that none in steps to permit the filling of pouches that may contain different quantities of liquid. Such existing devices, however, do not permit an adjustment of all of the movable members in order to adapt the entire valve to a particular liquid, to example, a liquid having a given viscosity.
SUMMARY OF THE INVENTION
The present invention provides a valve for the distribution of a liquid that permits a very rapid modification of the quantity of product distributed during the time the valve is open, while maintaining precise control over the quantity of product distributed.
To this end there is provided, according to the invention, a vlave for the distribution of a liquid having a valve body with a feeding duct, a distribution duct, a seal between the feeding duct and the distribution duct, a closing device mounted in a movable manner facing the seat, and means for governing the closing device in order, to position the closing device relative to the seat. This means for governing the closing device has a means movable in steps connected to the closing device by a common connecting rod. The distribution valve further includes a means for adjusting the assembly of movable means relative to the valve body.
Thus, in order to globally adjust the opening that corresponds to each one of the steps, it is sufficient to perform a single adjustment without a need to uncouple the valve.
In a preferred embodiment, the valve having means movable in steps in assembled in a governing casing associated with the valve body, the adjusting means includes a screwnut connected to the valve body to rotate relative to the body, an external thread on part of the governing casing arranged coaxially to a connecting rod and held in a screwnut, and a means to prevent the governing casing from rotating with the screwnut. Thus, the rotation of the screwnut causes a displacement of the entire casing, and a displacement of the means movable in step in a direction parallel to the connecting rod causing a modification of the valve opening.
In a preferred embodiment of the invention, the latter includes means for closing the valve in the absence of governing fluid. Specifically, the means for closing the valve in the absence of governing fluid includes a maximum opening piston associated with the common connecting rod, a spring acting on the piston in the direction
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Soubrier Pierrre
Susini Etienne
Barrett Robert M.
Baxter International Inc.
Flattery Paul C.
Schaafsma Paul E.
Walton George L.
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