Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1996-01-16
1997-07-01
Hepperle, Stephen M.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
137500, 137501, F16K 1730
Patent
active
056427522
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a direct-acting controllable constant flow regulating lift valve, namely, a controllable constant flow regulating lift valve without pilot valve, to be installed in a liquid transportation line, provided with an automatic flow restriction regulating passage, capable of operating on the basis of a working force derived from dynamic parameters of the working fluid, such as the valve-inlet pressure, the valve-outlet pressure and the variation of the outlet liquid level, said lift valve having valve members so associated that the axial thrust acting on the spindle is balanced to reduce valve operating power to the least extent, said lift valve being capable of being easily fabricated regardless of its dimensions. The present invention also relates to a valve having a self-cleaning function to avoid the deposition of soil, sand and dirt that may obstruct the operation of the valve.
In this specification, "water" is the general term for liquids.
BACKGROUND ART
Conventional valves, such as butterfly valves and gate valves, are not encountered by troubles when used as simple shut-off valves. However, when used for regulating flow rate under severe conditions, such as conditions for transporting high-pressure water, the conventional valves of this type are liable to generate drift currents and turbulence because the conventional valves, in general, have an irregular valve opening, and such drift currents and turbulence are liable to generate large noise and intense vibrations, to induce impulses, to cause rapid corrosion and breakage of the main component parts of the valves. On the other hand, lift valves are less liable to generate drift currents and turbulence because lift valves have a regular valve opening. However, the lift valves once closed are difficult to open due to unbalanced action of pressure on the valve element and the lift valves are unable to function properly if due attention is not paid. Therefore, it has been a usual practice to use a double-seated lift valve in which the axial thrust acting on the valve element is balanced or to use a single-seated valve having a spindle integrally provided with a balancing piston which reduces the axial thrust that acts on the valve element.
Nevertheless, the conventional lift valves still have many problems. As mentioned above, an axial thrust reducing means for a high-pressure lift valve or a large lift valve is complex and increases the manufacturing costs of the lift valve significantly, and it is very difficult to control flow rate in a pipe in which pressure varies violently. In lift valves, as well as in valves of other types, troubles due to the deposition of soil, sand and dirt are liable to occur when the lift valves are adjusted to low flow rate and these troubles are difficult problems to solve.
Accordingly, it is an object of the present invention to provide an easy-to-use controllable variable flow regulating lift valve solving those problems of the conventional lift valves, capable of exerting stable flow regulating performance, requiring very small power for valve operation, and provided with a flow regulating valve means and an automatic flow restriction means capable of an automatic cleaning function to avoid clogging.
DISCLOSURE OF THE INVENTION
The present invention pertains to a valve in the technical field of direct-acting controllable constant flow regulating valves. The present invention is applied to a lift valve having a regular passage least liable to generate violent turbulent currents or drift currents during flow regulating operation, and comprising, as principal components, a variable flow regulating valve element, a slide valve element for automatic flow restriction, and a valve body having an inlet passage, a flow damping chamber (middle chamber) and an output passage arranged in that order along the direction of flow.
The flow regulating valve element and the slide valve element come into contact with each other immediately before the flow passage is shut off to balance
REFERENCES:
patent: 3115891 (1963-12-01), Kimm
patent: 3344805 (1967-10-01), Wapner
patent: 3428080 (1969-02-01), Brown
patent: 4250915 (1981-02-01), Rikuta
patent: 4830042 (1989-05-01), Cho
patent: 4967789 (1990-11-01), Kypris
Ogura Kunio
Yokota Hiroshi
Yokota Shingo
Hepperle Stephen M.
Kabushiki Kaisha Yokota Seisakusho
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