Valves and valve actuation – With selective flow regulation
Reexamination Certificate
2000-01-06
2001-10-09
Lee, Kevin (Department: 3754)
Valves and valve actuation
With selective flow regulation
Reexamination Certificate
active
06299134
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a valve for stream flow adjustment as per the introductory chapter of claim
1
.
FIELD OF THE INVENTION
Many types of valves are known, where the construction of the closing element varies according to the purpose of use and in order to achieve a required characteristic curve. For stream adjustment valves have been used, to the spindle of which for the adjusting function a linear motion is brought. The spindle linear motion opens or closes the port. A problem has been accumulation of sludge or mass contained in the flow, which has caused changes in the qualities of flow and penetration of mass to the sliding surfaces of flow or corresponding closing element, which has caused valve stagnations.
For instance, the printed German patent specifications 691334 and 625297 disclose valves with a small pressure drop in the opened state, but disturbed flow in intermediate positions. Disturbance only occurs in the flow after the closing element. These valves are not suitable as adjusting valves for mass flow.
SUMMARY OF THE INVENTION
By means of a valve according to this invention the frequent problems are avoided and substantially better qualities by mass flow adjustment achieved.
The advantage of the invention is that on the most used part of the characteristic curve stream flow takes place cleaning the valve so that there is no sludge accumulation in the valve interior part, flow takes place with a pressure drop proper to the use and the dependence of flow quantity on the linear motion is easily determined or known. When the adjustable flow hits the beveled lower surface of the closing element, the pressure drop then begins to form already at the closing element.
REFERENCES:
patent: 2980392 (1961-04-01), Greenwood
patent: 3384338 (1968-05-01), Dermody
patent: 4283041 (1981-08-01), Kujawski
patent: 5150734 (1992-09-01), Chiba
patent: 5516079 (1996-05-01), Baumann
Larson & Taylor PLC
Lee Kevin
Tasowheel Oy
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