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Double-offset butterfly valve

A butterfly valve and valve body technology, applied in the field of double eccentric butterfly valves, can solve problems such as expensive and difficult to produce

Inactive Publication Date: 2015-02-11
QTRCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the triple eccentric butterfly valve is that the seat has no friction, but the unique tapered shape of the outer circumference of the disc that provides the third eccentricity requires precision machining, which makes this valve expensive and difficult to produce

Method used

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  • Double-offset butterfly valve
  • Double-offset butterfly valve
  • Double-offset butterfly valve

Examples

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Embodiment Construction

[0017] see first figure 1 and figure 2 , the double eccentric butterfly valve of the present invention is shown in the figure, generally indicated by 10 . The butterfly valve 10 includes a valve body 12 , a valve seat 14 supported by the valve body 12 , and a valve disc 16 mounted on a rotating shaft 15 of the valve body 12 . Such as image 3 As best shown, the shaft 15 is mounted eccentrically within the valve body 12, wherein the centerline 7 of the shaft 15 is offset from the centerline 17 of the valve body 12, and the centerline 9 of the shaft 15 is offset from the knife edge of the valve disc 16. Centerline 19 of (knife edge) 22 (discussed more fully later). The valve seat 14 has a radially inwardly facing seat surface 13 . In the preferred embodiment, the seat surface 13 is a frustoconical surface which is tangent to the spherical surface formed by turning the valve disc in a single eccentric butterfly valve design. The valve disc 16 has a peripheral disc surface 1...

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PUM

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Abstract

A double offset butterfly valve comprising a valve body, a valve seat carried by the valve body, and a valve disc mounted on a shaft rotatably journaled in the valve body, the shaft being eccentric both to the centerline of the body and to the centerline of the valve disc (double offset). The periphery of the valve disc has a substantial knife edge which contacts the valve seat without rubbing. As the valve disc rotates, the knife edge remains out of contact with the valve seat until the knife edge contacts the seat at full closure.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application No. 61 / 638,195 filed April 25, 2012, the contents of which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to a double eccentric butterfly valve, and more particularly to a double eccentric butterfly valve which has improved sealing performance and is easier to manufacture. Background technique [0004] Butterfly valves are commonly used to shut off or regulate flow. Butterfly valves can be non-eccentric or eccentric. Non-eccentric butterfly valves have the lowest performance class and are limited in application. One reason for this is that the valve shaft passes through the edge of the disc, breaking the continuity of the edge of the disc. Another reason is that when the valve is opened or closed, part of the disc always rubs against the seat causing friction and wear. [0005] The edge of the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/22
CPCF16K1/22F16K1/222F16K1/42F16K1/2261F16K1/2263
Inventor E·霍尔特格弗
Owner QTRCO