Fluid handling – With repair – tapping – assembly – or disassembly means – Assembling – disassembling – or removing cartridge type valve
Patent
1989-05-04
1990-02-20
Walton, George L.
Fluid handling
With repair, tapping, assembly, or disassembly means
Assembling, disassembling, or removing cartridge type valve
51241VS, 137330, F16K 4300
Patent
active
049017527
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for maintenance of a ball valve and in particular a ball valve of the kind which is described in, for example, Norwegian patent application no. 860923.
According to the application mentioned above, the inner vital components of the ball valve such as ball/spindle, washers, seats for washers, actuators, bearings etc. can be inspected, overhauled, repaired, replaced while the valve is for instance submerged at great depths, and without sea water seeping into the pipeline to which the valve is connected, or without flow medium leaking out of the pipeline into the surrounding medium. With the valve open in normal operating conditions, the mentioned inner vital components are separated from the flow medium in the pipeline by means of a tight barrier and are thus effectively protected against damaging influences from the flow medium and/or the pollution and particles which this may contain. The vital parts of the valve are therefore ensured a considerably better environment than is the case for other known ball valves for relevant purposes, and the vital parts are easily accessible for maintenance without the use of complicated and expensive protective equipment.
The ball valve, according to the above application, comprises internal sleeves which extend through the valve, namely from the valve housing's one opening, through the ball to the valve housing's second opening, and these sleeves create a tight continuous conduit through the valve when this is open. The ball of the valve is bisected and the sealing parts, together with spindle/actuator, are mounted on an upper ball part and the internal sleeves are mounted in the lower ball part. The two ball parts are releasingly joined to each other and when in an assembled condition form a ball/spindle device which bears against/is directed towards the valve housing and bonnet.
When the valve is open, the upper ball part, which is provided with the sealing parts together with spindle/actuator, can be dismounted by being withdrawn vertically up from the valve housing, whilst the lower ball part with the internal sleeves remains inside the valve housing, forming the tight, continuous conduit through the valve. With such a method of dismounting, most of the vital parts of the valve are accessible for inspection, control, overhauling, repair and replacement.
In the case of the ball valve which is described in the above mentioned application, the sealing rings in the sleeve cannot be replaced, nor can the seats of the valve housing be polished without seawater flowing into the pipeline and oil/gas flowing out into the surrounding medium, when the ball valve is placed on an underwater pipe.
The object of the present invention is to provide a tool which facilitates maintenance of the moveable sleeves of the above-mentioned valve and their corresponding bearing surfaces. The object is achieved with a tool which is characterized by the features which are evident in the following independent patent claims. Further advantageous characteristic features are disclosed in the dependent claims.
The invention will be more closely described in the following, with reference to the accompanying drawings where:
FIG. 1a shows a vertical section through the apparatus.
FIG. 1b shows a horizontal section/outline of the apparatus.
FIG. 2a and 2b show vertical sections through the honing tool.
FIG. 3a-3c show a dismounting tool for the sealing rings of the sleeve.
FIG. 4a-4c show a mounting tool for new sealing rings.
FIG. 5-8 show different stages in the maintenance procedure.
The intervention tool is shown in detail in FIGS. 1-4 and comprises a bonnet 7 with external clamps 9. The bonnet is designed in order, by means of the clamps 9, to be secured to and to form a tight connection to a valve flange 53 (FIG. 5) by means of sealing rings 28. The tool itself is secured to the under side of the bonnet 7 and comprises:
Rotating mechanism for 90 degrees rotation of the honing tool and pipe sleeves 52 (FIG. 5).
Honing tool 1 for honing of spherical sea
REFERENCES:
patent: 1817917 (1931-08-01), Carpenter
patent: 4114483 (1978-09-01), Grimsley
patent: 4287688 (1981-09-01), Jensen
patent: 4346728 (1982-08-01), Sulzer
patent: 4468158 (1984-08-01), Pearce et al.
patent: 4610112 (1986-09-01), Kelsey
patent: 4727901 (1988-03-01), Horvei
Statoil
Walton George L.
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