Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1989-03-01
1990-12-25
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
1376275, G05D 1606, G05D 1610
Patent
active
049795376
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pressure regulator which is subjected to the action of a proportional force, for example to that of a proportional magnet, and which includes a valve box which comprises a primary coupling, a secondary coupling and a deaeration coupling and two valve elements which are placed coaxially one with respect to the other, and are guided in a manner so as to be able to move in the valve box and which may be subjected to the action of the setting force. The first valve controls a valve seat in the shape of a cup provided in the valve box and connecting the primary side to the secondary side, and closes it in the rest and deaeration position, and opens it for the passage in the working position, while the second valve element is applied, in the rest position as well as in the working position, on a seat surface of the first valve element, and in the zone of the seat surface, prevents any deaeration by this valve element toward the deaeration coupling but in the deaeration and separation position with the first valve element, clears the passage between this valve element and the deaeration coupling, the seat valve of the first valve element and the valve surface which cooperates with the valve seat in the valve box being situated in a common diametrical plane and the seat surface being inside and surrounded by the valve seat.
BACKGROUND OF INVENTION
A pressure regulator of this type is known, in which the first valve element is constituted by a head mounted at the lower end of a relatively long tubular rod which, at its upper end, is formed with a seat surface for the second valve element which is also in the shape of a valve head and which is subjected from above to the proportional setting force. The second valve element is in the deaeration zone which, in this pressure regulator, has to be necessarily effected upwardly, toward the correction member. The coupling for the secondary pressure is at the lower end of the valve box and is disposed coaxially with respect to the two valve elements. The coupling for the primary pressure is on the axial length between the couplings for the secondary pressure and for the deaeration, and reaches a toroidal chamber. The disadvantage of this known pressure regulator is that it is only usable in the case of nominal passage sections which are not over 6 mm. In this case, the magnitude of the setting force is dependent on the nominal passage section. The larger the nominal passage section, the greater the setting force has to be. The other disadvantage consists in the fact that the deaeration section which is defined by the tubular passage section in the rod is clearly less than the deaeration section. If one uses for example a proportional magnet, proportional magnets of large dimensions which are heavy and relatively costly have to be used in this known pressure regulator.
The object of the invention is a pressure regulator of the type defined in the foregoing, which allows using only reduced setting forces for high pressures and large mid pressure flow rate, and which is adapted in all cases to large nominal passage sections, which may reach for example 20 mm.
According to the invention, this object is reached by using a pressure regulator of the type initially defined, due to the fact that the second valve element includes in the middle of its end which is turned toward the seat surface of the first valve element a valve seat made of a cup, which allows the second valve element to be brought in an engagement which is substantially linear with the seat surface of the first surface element, and that the outer diameter of the cup of the second valve element corresponds to the inner diameter of the valve box cup.
Due to its structure, the pressure regulator according to the invention allows treating high pressures and large flow rates while requiring setting forces which are not very large. When for example the proportional setting force is obtained by means of proportional magnets, the latter can be, due to the inventi
REFERENCES:
patent: 3071147 (1963-01-01), Dudzinski
patent: 3525555 (1970-08-01), Meyer
patent: 3730226 (1973-05-01), Nelson
patent: 4077674 (1978-03-01), Doto
patent: 4096884 (1978-06-01), Horowitz
Joucomatic S.A.
Nilson Robert G.
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