Claims
- 1. A butterfly valve of inspectable type comprising:
- a tubular body, the central portion of which defines a shutoff chamber, communicating with the outside through a lateral orifice forming an inspection trap;
- a first annular inner radial face in said tubular body;
- a second inner radial face in said body confronting said first face,
- an annular pre-body in said chamber,
- said pre-body adapted to pass through said orifice,
- said pre-body provided with two substantially radial boreholes which are diametrically opposite each other with the axis of the said boreholes passing through the said orifice;
- extensible clamping means between said pre-body and said second face axially clamping a first radial flank of said pre-body against said first radial face by exerting a force moving said radial flank toward said first radial face to removably fasten said pre-body in said body:
- a butterfly valve member;
- shaft means positioned in said boreholes and mounting said valve member for rotation;
- sealing means adapted to cooperate with one of said body and pre-body and with the said butterfly valve member to provide upstream/downstream tightness of the valve; and
- a cap adapted to be mounted on said body in such a manner as to tightly and removably close said orifice, said cap having a passage in which said shaft means is rotatably mounted.
- 2. The valve of claim 1 wherein said shaft means is provided by two coupled shafts one of which is mounted in the pre-body and the other is mounted in and extends through said cap; said coupling providing a slight play so as to transmit the operating torque and filer out the parasitic forces due to misalignments or deformations in operation.
- 3. The valve of claim 1 wherein the clamping means comprise bolts which are screwed into tapped boreholes produced on the radial flank of the pre-body opposite said first radial flank.
- 4. The valve of claim 2 wherein the clamping means comprise bolts which are screwed into tapped boreholes produced on the radial flank of the pre-body opposite said first radial flank.
- 5. The valve of claim 1 wherein said sealing means comprise a seal mounted in a radial annular groove formed between the first radial flank of the pre-body and the inner radial face of the body.
- 6. The valve of claim 5 wherein said seal means consists of a flexible metal double toric joint comprising:
- a first toric joint structure between the body and pre-body intended to assure static tightness with the body of the valve;
- a second toric joint structure of a diameter less than that of the first structure and intended to cooperate with the edge of the butterfly valve member so as to obtain dynamic tightness with it;
- a membrane assuring continuity of the seal between the two joint structures; and
- a mounted reaction ring clamped against the second joint structure in the space contained between the two structures.
- 7. A valve according to claim 6 wherein said first joint structure is axially compressed between the radial face of the body and the radial flank of the pre-body.
- 8. A valve according to claim 6 wherein said first joint structure is radially compressed between the bottom of the groove and a second reaction ring arranged in the space contained between said first reaction ring and said first joint structure.
- 9. A valve according to claim 1 wherein said orifice provides access to said clamping means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
86 17031 |
Dec 1986 |
FRX |
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Parent Case Info
This application is a continuation-in-part of our application Ser. No. 07/128,613 filed 4 Dec. 1987 for Butterfly Valve of Inspectable Type, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2538067 |
Jun 1984 |
FRX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
128613 |
Dec 1987 |
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