Fluid handling – Destructible or deformable element controlled – Destructible element
Patent
1981-04-22
1983-11-08
Weakley, Harold W.
Fluid handling
Destructible or deformable element controlled
Destructible element
137 71, 137312, 137458, 137464, F16K 1304
Patent
active
044136439
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a hose-break valve for pressure hoses or conduits with a surrounding protective hose or conduit and a pressure medium in a space between the pressure and protective hoses or conduits, said valve having a sliding gate which is movable along a valve housing between an open position and a closed position preventing throughflow through the valve and which is adapted to be actuated by said pressure medium to be held thereby in the open position against the action of a loading device yieldably actuating the sliding gate towards the closed position and adapted to close the valve when the pressure of said pressure medium falls short of a lower limit value, so that the valve will prevent backflow of gas or liquid from an appliance located downstream of the valve upon leakage or break upstream of said valve.
A known hose-break valve of this type is described in the published Swedish patent application 7702588-0 and comprises a movable or displaceable sliding gate which is actuated not only by the pressure medium enclosed between the pressure conduit and the protective sleeve thereof, but also by a spring pressure opposed to the pressure of the pressure medium, the said two pressures maintaining the sliding gate in a position permitting liquid to pass through the valve when the said pressures counterbalance each other, i.e. when they are equal, but displacing the sliding gate in one or the other direction to close the liquid flow through the valve when one or the other pressure exceeds the opposed pressure, for instance upon break of the pressure conduit and/or its protective sleeve. The function of these known hose-break valves is satisfactory, except when pressure surges occur in the pressure conduit or in the pressure medium within the protective sleeve, and when a small leakage occurs in the pressure conduit or in the sleeve. Thus, it was found that such pressure surges upset the spring-balanced position of the sliding gate, and furthermore the effects of the pressure surges are aggravated because the sliding gate is moved out of the balanced open position and partially closes the throughflow through the valve. A small leakage in the pressure conduit or in the sleeve will cause the balanced position of the sliding gate to be displaced in one or the other direction from the open position of the valve, resulting in a partial throttling which may remain over a long period of time until so much pressure medium has leaked out that the valve will be fully closed. Such long-term throttling of the flow through the valve may result in considerable loss of power.
The present invention therefore has for its object to obviate these shortcomings of the prior art hose-break valves operating with a pressure medium to actuate a sliding gate included in the valve. To achieve this object, the hose-break valve of the present invention is characterized by the features stated in the appended claims.
The invention will be described in detail in the following, reference being had to the accompanying drawings in which:
FIG. 1 is a longitudinal section of a portion of a first embodiment of the invention;
FIG. 2 is a side view of a sleeve forming a valve housing in the first embodiment;
FIG. 3 is a side view of a sliding gate in the first embodiment;
FIG. 4 illustrates a tool attached to the valve for mounting the valve and for emergency release thereof;
FIG. 5 is an exploded view of the details of a valve releasing or pressure relieving mechanism in the first embodiment;
FIG. 6 illustrates a detail of the first embodiment of the invention;
FIGS. 7 and 8 illustrate alternative embodiments of the connection of the valve sliding gate to a protective sleeve surrounding the pressure conduit;
FIG. 9 illustrates a modified embodiment of the valve according to the invention;
FIG. 10 illustrates a longitudinal section of another embodiment of the present valve in open position;
FIG. 11 illustrates a longitudinal section of a part of the valve of FIG. 10 in a partially closed position; and
FIGS. 12 and 13 show a side view
REFERENCES:
patent: 2608205 (1952-08-01), Proctor
patent: 2788794 (1957-04-01), Holinger
patent: 3104673 (1963-09-01), Kirsch
patent: 3512556 (1970-05-01), McKhann
Regioninvest I Norr AB
Weakley Harold W.
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