Spring-loaded safety valve

Details Spring-loaded safety valve Spring-loaded safety valve

1999-12-23

2001-05-08

Buiz, Michael (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S531000, C137S535000, C137S537000

Reexamination Certificate

active

06227239

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a spring-loaded safety valve.
BACKGROUND OF THE INVENTION
The textbook by Prof. Dr.-Ing. Siegfried Hildebrand: “Feinmechanische Bauelement”, VEB Verlag Technik Berlin, 4th edition, 1980, pages 677 describes centrifugal-braking-force regulators which have lever-mounted centrifugal weights and in which the centrifugal force acts against the resetting force of a compression spring arranged axially relative to the stroke axis. The effectiveness of the regulator starts from a limit speed at which the braking surfaces are just in contact. The spring force increases with increasing stroke.
An automatically resetting safety valve requires rapid opening on the one hand and wide opening on the other hand, even if the valve-opening force, after reaching a release force, does not increase substantially over the stroke of the valve or even decreases.
SUMMARY OF THE INVENTION
The invention, achieves the object of developing a spring-loaded safety valve of the type mentioned above in such a way that wide opening of the valve, after reaching a predeterminable valve-opening force, is also ensured when the latter subsequently does not increase.
In accordance with the present invention, a spring-loaded safety valve includes a valve-closing body. The valve-closing body has at least one valve-closing-body joint, in which at least one first closing-body lever is rotatably mounted. The first closing-body lever is rotatably connected via a further joint to a first support lever. The first support lever is rotatably mounted in at least one support-lever joint and in which the further joint is a spring-loaded sliding joint.
In accordance with another aspect of the invention, the valve-closing body is movable along a plain-bearing axis and the sliding joint is in operative connection with at least one spring, which, in a closing position of the valve-closing body, essentially exerts a preloading force, directed orthogonally to the plain-bearing axis, on the sliding joint for a closing movement of the safety valve.
According to a further aspect of the present invention, the at least one first closingbody lever, in the closing position of the valve-closing body, has a closing-body angle with the plain-bearing axis within an angular range of 25°-60° .
In accordance with an additional aspect of the present invention, the at least one first support lever, in the closing position of the valve-closing body, is oriented essentially parallel to the plain-bearing axis.
In accordance with a further aspect of the present invention, first and second closing-body levers and first and second support levers are provided, and are arranged in mirror image relative to a plain-bearing axis of the valve-closing body.
According to a further aspect of the present invention, the at least one support-lever joint is fastened to a rigid lever wall, which is oriented orthogonally relative to a plainbearing axis of the valve-closing body.
An advantage of the invention consists in the fact that the spring-loaded safety valve opens rapidly and reliably as soon as a pressure on the valve reaches a predeterminable preloading-force limit value.
Wide opening may be achieved with a spring stack having a flat spring characteristic and large stroke. Rapid opening requires a small mass of the moving parts. According to the invention, both requirements may be fulfilled at the same time, which is not possible with a directly acting spring assembly, e.g. having a disk or compression spring.


REFERENCES:
patent: 1152114 (1915-08-01), Luitwieler
patent: 1716832 (1929-01-01), Odend'hal
patent: 4201242 (1980-05-01), Troxell, Jr.
patent: 161796 (1905-07-01), None
Hildebrand, S, “Feinmechanische Bauelemente”, VEB Verlag Technik Berlin, 4thedition, 1980, pp. 677-679.

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