Valves and valve actuation – Rotary valves – Seat or interface seal
Patent
1999-04-23
2000-09-12
Shaver, Kevin
Valves and valve actuation
Rotary valves
Seat or interface seal
251173, 251368, 251316, F16K 2500, F16K 500, F16K 3100
Patent
active
061165751
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a valve seat structure, and more particularly, to a seat structure appropriate for a ball valve in which a friction is repeatedly produced between a ball and a seat.
BACKGROUND ART
A general ball valve is constituted with a valve body, a ball and a handle. The valve body includes an inflow vent through which a fluid comes in, and an outflow vent through which the fluid passes out. The ball is rotatably disposed in an internal space of the valve body so as to open or close the valve which communicates with the inflow vent and outflow vent. Also, the handle controls the rotation of the ball.
A ring type seat is disposed between the internal space of the valve body and the inflow vent and between the internal space of the valve body and the outflow vent to be tight contact with a corresponding peripheral portion of the ball.
Such a ring type seat is conventionally formed of Teflon resin to obtain gastightness and lubricability.
However, the conventional ball valve seat formed of Teflon resin is soft in characteristic and shows a low antiabrasion. Further, considering a repeated friction in the ball valve between the seat and the ball, the Teflon resin seat tends to be easily worn out and subject to deforming when exposed to a high temperature (more than 150.degree. C.) and a high pressure.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to provide a seat structure for a ball valve applicable to an atmosphere of high temperature and high pressure with improved airtightness and lubricability.
To achieve the above-described object, there is provided a seat structure for a ball valve according to the present invention which includes a seat member formed by rolling up an alternate stack of a metallic thin plate and a lubricant non-metallic (graphite, asbestos, Teflon, etc.) thin plate. The seat member is provided with a fixture portion fixed into an inner periphery of the valve body and a ball contact which is to be abutted to a valve ball provided between the inflow vent side and the outflow vent side.
The object and advantages of the present invention will become more readily apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific example, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein:
FIG. 1 is a cross-sectional view illustrating a ball valve adopting a seat structure according to a first embodiment of the present invention;
FIG. 2 is an enlarged view detailing portion "A" in the view of FIG. 1;
FIG. 3 is a partial enlargement view detailing a seat structure for a ball according to a second embodiment of the present invention;
FIG. 4 is a partial enlargement view detailing a seat structure for a ball according to a third embodiment of the present invention;
FIG. 5 is a partial enlargement view detailing a seat structure for a ball according to a fourth embodiment of the present invention;
FIG. 6 is a partial enlargement view detailing a seat structure for a ball according to a fifth embodiment of the present invention; and
FIG. 7 is a perspective view for illustrating a seat construction process according to the preferred embodiments of the present invention.
MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS
With reference to the accompanying drawings, a seat structure for a ball valve according to the preferred embodiments of the present invention will now be described.
FIG. 1 is a cross-sectional view illustrating a ball valve adopting a seat structure according to a first embodiment of the prese
REFERENCES:
patent: 2369025 (1945-02-01), Cummings
patent: 2762601 (1956-09-01), Clade
patent: 3333813 (1967-08-01), Rabe
patent: 4044994 (1977-08-01), Priese
patent: 4269391 (1981-05-01), Saito et al.
patent: 4892320 (1990-01-01), Tiickmantel
patent: 5170993 (1992-12-01), Bonetti
Bonderer David A.
Shaver Kevin
LandOfFree
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