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Replaceable valve gasket
PATENTS 1
4
5
Non-asbestos spiral gasket
2 3 4
Title: Spiral wound type gasket Patent number: US5997007 Date: 7 December 1999 Inventors: K Hanashima, M Nakano, S Morita Assignee: Nichias Corp
3
Replaceable valve gasket Tide: Snap-on valve gasket Patent number: US5996966 Date: 7 December 1999 Inventor: R D Zimmerly Assignee: Tri-Clover Inc This patent tackles the problem of replacing gaskets on valves which are used in food processing. A new gasket needs to be easy to fit on site. However, the construction of the gasket
12c
12h 1
2
In between the segments, cleaning liquid can flow into the inside of the gasket to remove any particles of food, so that all parts of the valve and the gasket are thoroughly cleaned.
g
and the valve must enable them to be thoroughly cleaned, by flushing them with special liquids. The shape of the gasket and valve are such that the new gasket can be easily stretched and pushed into place. To enable cleaning, when the valve is open there are clear passages, so that the cleaning liquid can flow between the valve and the gasket. Figure 5 shows the valve with inlet 21, outlet 18 and removable cover 15. Figure 6 shows valve and its gasket. To fit the gasket it is pushed over a shoulder at the bottom of the valve. The shoulder consists of three segments 35, 36 and 37, so that the gasket can be easily stretched.
Spiral gaskets are used in pipe joints which are subject to high temperatures and pressures, such as those in combustion engine exhausts. They consist of a metal strip and a strip of filler material which are bonded together and then wound into a spiral When asbestos was used as filler, the bond with the metal strip was not affected by the high temperatures. However, now non-asbestos filler is used, and because it is inorganic the bond tends to fail. This non-asbestos gasket uses a metal strip with a V-shaped cross-section. Because of this cross-section, when the gasket is wound into a spiral, the filler is not in contact with the hot exhaust pipe, so that the bond is not affected. The exact shape of the cross-section is chosen so that the gasket is effective, regardless of how much it is compressed, and so that the metal strip is not distorted when highly compressed. Figure 7 shows the construction of the gasket. Two layers of metal strip form inner ring 4, alternate layers of strip and filler form the main body 3 of the gasket, and tow layers of the metal strip form the outer ring 5.
10
18
-16 r ~ 22
1
SealingTechnologyNo. 75
24
(~)
4
5
Non-asbestos spiral gasket
2 3 4
Title: Spiral wound type gasket Patent number: US5997007 Date: 7 December 1999 Inventors: K Hanashima, M Nakano, S Morita Assignee: Nichias Corp
3
Replaceable valve gasket Tide: Snap-on valve gasket Patent number: US5996966 Date: 7 December 1999 Inventor: R D Zimmerly Assignee: Tri-Clover Inc This patent tackles the problem of replacing gaskets on valves which are used in food processing. A new gasket needs to be easy to fit on site. However, the construction of the gasket
12c
12h 1
2
In between the segments, cleaning liquid can flow into the inside of the gasket to remove any particles of food, so that all parts of the valve and the gasket are thoroughly cleaned.
g
and the valve must enable them to be thoroughly cleaned, by flushing them with special liquids. The shape of the gasket and valve are such that the new gasket can be easily stretched and pushed into place. To enable cleaning, when the valve is open there are clear passages, so that the cleaning liquid can flow between the valve and the gasket. Figure 5 shows the valve with inlet 21, outlet 18 and removable cover 15. Figure 6 shows valve and its gasket. To fit the gasket it is pushed over a shoulder at the bottom of the valve. The shoulder consists of three segments 35, 36 and 37, so that the gasket can be easily stretched.
Spiral gaskets are used in pipe joints which are subject to high temperatures and pressures, such as those in combustion engine exhausts. They consist of a metal strip and a strip of filler material which are bonded together and then wound into a spiral When asbestos was used as filler, the bond with the metal strip was not affected by the high temperatures. However, now non-asbestos filler is used, and because it is inorganic the bond tends to fail. This non-asbestos gasket uses a metal strip with a V-shaped cross-section. Because of this cross-section, when the gasket is wound into a spiral, the filler is not in contact with the hot exhaust pipe, so that the bond is not affected. The exact shape of the cross-section is chosen so that the gasket is effective, regardless of how much it is compressed, and so that the metal strip is not distorted when highly compressed. Figure 7 shows the construction of the gasket. Two layers of metal strip form inner ring 4, alternate layers of strip and filler form the main body 3 of the gasket, and tow layers of the metal strip form the outer ring 5.
10
18
-16 r ~ 22
1
SealingTechnologyNo. 75
24
(~)