Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1998-05-08
2000-10-17
Shaver, Kevin
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 73, F16K 31122
Patent
active
061318760
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a valve comprising a valve housing with a duct that can be optionally opened or closed, a valve body, and a valve spindle that is displaceable from a first position where the valve spindle closes the duct to a second position where the valve spindle opens the duct. More precisely the invention relates to a valve according to the preamble of appended claim 1.
DESCRIPTION OF THE RELATED ART
The problem associated with known valves is that the forces that are needed to keep them closed are great and that the valves are normally kept closed by the relative pressure in different areas in the valve. Hereby known valves function so that a greater area is used for opening the valve with a lower pressure. It requires great forces to shift these valves into different working positions. These valves often have problems with leakage and their construction is complicated.
Valves closing with levers are also known, but due to the great forces involved they have a tendency to break down when adjusted and can therefore generally be adjusted only once.
GB Patent 1403460 discloses a valve with balls for locking the valve spindle alternately in an open or closed position. The valve is operated from an open to a closed position, and vice versa, by means of a hand operated key. When opening the valve the fluid pressure operating in the valve is not utilized for displacing the valve spindle into an open position. Hereby the valve cannot be easily operated if there is a high fluid pressure in the valve.
BRIEF SUMMARY OF THE INVENTION
The present invention relates to a valve where the solution to said problems has been achieved. For this purpose the features given in appended claim 1 characterize the present invention. Preferred embodiments of the valve are described in appended claims 2-10.
The opening pressure of the valve is determined solely by the force (pressure) required for displacing the flange part and hereby freeing the displacement element/elements from its/their path in the valve, since the construction is such that a pressure (working pressure) operating in the valve duct displaces the valve spindle into a position where the valve is open.
The valve is operated by means of a mechanical locking mechanism that is opened pneumatically or hydraulically. The locking mechanism is closed and opened by means of at least one displacement element that is guided by a path so that when the locking mechanism is opened the displacement element can roll out of the locking mechanism, whereby the valve is opened by the valve spindle being displaced by the pressure operating in the valve duct.
The valve of the invention functions securely, its dimensions are small and the valve parts do not become deformed by the forces needed to operate the valve. The valve can easily be opened with very small forces, solely by displacing the flange part that in the closed position of the valve hinders the displacement element from being displaced outwards so that the valve spindle can be displaced from a closed to an open position. To give an example, the valve only requires an opening pressure of about 2 bar when the working pressure on the valve is 200 bar. The valves on the market normally require 15 bar for opening at a working pressure of 150 bar.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following an embodiment of the invention will be described by means of an attached drawing, in which
FIG. 1 shows the valve in a closed position,
FIG. 2 shows the valve according to FIG. 1 seen along the intersectional line II--II,
FIG. 3 shows the valve in an open position and
FIG. 4 shows the valve according to FIG. 3 seen along the intersectional line IV--IV.
DETAILED DESCRIPTION OF THE INVENTION
The valve in FIG. 1 comprises a valve housing 1 with a duct 2 that can alternately be opened and closed by means of a valve spindle 3. The valve spindle 3 is displaceable in a valve body 4 that is screwed into the valve housing 1. When the valve spindle 3 is in a first position it will close
REFERENCES:
patent: 2692112 (1954-10-01), Szitar, Jr.
patent: 3385559 (1968-05-01), Churchill
patent: 4398553 (1983-08-01), Perrine
patent: 4519580 (1985-05-01), Leighton et al.
patent: 4976460 (1990-12-01), Newcombe et al.
patent: 5478049 (1995-12-01), Lescoe
Keasel Eric
Marioff Oy
Shaver Kevin
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