KR200425049Y1 - Butterfly valve with rubber seat coated teflon - Google Patents

Abstract

The present invention utilizes the elasticity of the rubber sheet and at the same time, using the excellent chemical resistance of Teflon, while maintaining the sealing force continuously by the rubber sheet can solve the corrosion problems caused by seawater or chemicals by the Teflon coating A butterfly valve equipped with a teflon-coated rubber seat of the type, comprising: a valve body; A ring-shaped rubber seat mounted to the inner circumferential wall of the valve body; A teflon coating part coated on a portion where the rubber sheet is in contact with the fluid passing through the valve; A disk rotatably provided on an inner wall of the ring-shaped rubber sheet; A valve shaft connected to the disk through the valve body and the rubber seat; Characterized in that comprises a.

Butterfly Valve, Rubber Seat, Teflon Coating

Description

BUTTERFLY VALVE WITH RUBBER SEAT COATED TEFLON}

1 is a longitudinal cross-sectional view and a partial enlarged view of an embodiment according to the present invention.

<Description of Symbols for Main Parts of Drawings>

110: valve body 120: ring type rubber seat

121: shaft hole 122: ring-shaped mounting groove

123: support ring 130: Teflon coating

140: disk 150: valve shaft

160: packing

The present invention relates to a butterfly valve, and more particularly, in a butterfly valve equipped with a ring-shaped rubber sheet on the inner circumferential wall of the valve body that contacts the disk to block the leakage of fluid, the ring-shaped rubber sheet is passed through the valve It relates to a butterfly valve, characterized in that the Teflon coating is formed in the area in contact with the fluid.

In general, a butterfly valve is composed of a cylindrical valve body, a disk arranged inside the valve body, and a valve shaft for controlling the flow of fluid by rotating the disk, and manually rotating the disk on the valve shaft. Manual drive means such as a handle for driving, or automatic drive means for rotating the disk by driving the motor by electric, hydraulic, pneumatic or the like is connected.

In such a butterfly valve, the watertightness between the inner circumference wall of the valve body and the outer circumference of the disk is very important.

In order to ensure the watertightness, a ring-shaped rubber sheet mounted on the inner circumferential wall of the valve body has been used.

Since the ring-shaped rubber sheet has a certain elasticity, and thus is contracted or restored, the ring-shaped rubber sheet can firmly seal the inner circumferential wall of the disk and the valve body.

However, ring type rubber sheet has weak chemical resistance due to its material characteristics, so when it is exposed to chemicals such as oil for a long time, the rubber itself undergoes chemical change, causing the rubber to lose its elasticity and expand its volume. There are several problems.

This problem is not only a chemical substance, but also a similar problem occurs in the case of seawater.

Korean Utility Model Registration No. 20-0290379, "Rubber Lining Seat Integral Butterfly Valve", incorporated in the present specification as a related art related to the above, has been disclosed.

On the other hand, the ring-shaped Teflon seat may be attached to the inner peripheral wall of the valve body instead of the ring-shaped rubber sheet.

Teflon (PTFE, Polytetrafluoroethylene) is known as a fluorine resin having excellent heat resistance and excellent chemical resistance. Therefore, it is possible to faithfully perform the role of protecting the valve body by providing a ring-shaped seat on the valve body through which fluid such as seawater or chemicals pass. In addition to PTFE, FEP, PFA, ETFE and the like are known as fluororesins.

However, since Teflon itself is very elastic, it cannot be restored well once contracted. Therefore, after several openings and closings by Teflon, the watertightness between the Teflon sheet and the disk is weakened so that the flow path is not faithfully blocked. A problem arises.

The present invention was conceived in view of the problems of the prior art as described above, by using the elasticity of the rubber sheet and at the same time using the excellent chemical resistance of Teflon, while maintaining the sealing force continuously corrosion problems by seawater or chemicals, etc. We want to provide a butterfly valve with a new type of Teflon-coated rubber seat that can be eliminated.

The present invention to solve the above problems, the valve body; A ring-shaped rubber seat mounted to the inner circumferential wall of the valve body; A teflon coating part coated on a portion where the rubber sheet is in contact with the fluid passing through the valve; A disk rotatably provided on an inner wall of the ring-shaped rubber sheet; A valve shaft connected to the disk through the valve body and the rubber seat; Characterized in that comprises a.

In the above, the ring-shaped rubber seat is formed with a shaft hole for insertion of the valve shaft, a ring-shaped mounting groove is formed around the shaft hole of the ring-shaped rubber sheet, the support ring is inserted into the ring-shaped mounting groove desirable.

Hereinafter, the configuration and operation in detail according to an embodiment of the present invention.

1 is a conceptual longitudinal sectional view and a partially enlarged view of an embodiment according to the present invention.

This butterfly valve is composed of a valve body 110, a disk 140, a valve shaft 150.

The valve body 110 is formed with a cylindrical inner circumferential wall through which the fluid can pass.

The inner circumferential wall is mounted with a ring-shaped rubber sheet 120.

The ring-shaped rubber sheet 120 can maintain its watertightness even when repeated compression and restoration due to the elastic force of the rubber material.

On the other hand, the Teflon coating portion 130 is formed at a portion where the ring-shaped rubber sheet 120 is in contact with the fluid passing through the valve.

The Teflon coating unit 130 may prevent deterioration of the product due to contact with the fluid even when the fluid passing through the valve is seawater or chemicals due to the chemical resistance of the Teflon.

In addition, a shaft hole 121 is formed in the upper and lower portions of the ring-shaped rubber sheet 120 (may be formed only in the upper part) so that the valve shaft 150 can pass therethrough, and the shaft hole 121 is formed. ), The valve shaft 150 is provided.

Disk 140 is connected to the valve shaft 150, and thus the disk 140 is rotated in accordance with the rotation of the valve shaft 150, the outer periphery of the disk 140 is in contact with the Teflon coating 130, the valve Blocking the flow path of, the Teflon coating 130 is contracted or restored with the outer surface of the ring-shaped rubber sheet 120 by the elastic force of the ring-shaped rubber sheet 120. However, the Teflon coating 130 itself does not shrink or restore.

On the other hand, the upper end of the valve shaft 150 may be connected to a manual control unit such as a handle or an automatic control unit such as a motor shaft.

Meanwhile, a ring-shaped mounting groove 122 is formed around the shaft hole 121 of the ring-shaped rubber sheet 120, and a support ring 123 is inserted into the ring-shaped mounting groove 122. The support ring 123 is for preventing the shaft hole 121 from being deformed from a perfect circle to an elliptical shape or the like due to the rotation of the valve shaft 150. That is, the shaft hole 121 may be maintained in a completely circular shape to maintain contact between the ring-shaped rubber sheet 120 and the valve shaft 150, thereby preventing the fluid from leaking through the shaft hole 121.

In addition, the V-shaft 160 is coupled to the valve shaft 150, and a guide ring 170 is provided between the V-packing 160 and the ring-shaped rubber sheet 120. Thereby, the leakage of the fluid through the shaft hole 121 is completely prevented.

The above embodiments are merely preferred embodiments of the present invention, and the technical spirit of the present invention may be variously modified or adjusted by those skilled in the art. If such modifications or adjustments use the technical idea of the present invention, it is within the scope of the present invention.

As described above, the present invention utilizes the elasticity of the rubber sheet and at the same time, using the excellent chemical resistance of Teflon, while maintaining the sealing force continuously by the rubber sheet to solve the corrosion problem by seawater or chemicals by the Teflon coating part. A butterfly valve with a new type of Teflon-coated rubber seat can be provided.

Claims (2)

Valve body; A ring-shaped rubber seat mounted to the inner circumferential wall of the valve body; A teflon coating part coated on a portion where the rubber sheet is in contact with the fluid passing through the valve; A disk rotatably provided on an inner wall of the ring-shaped rubber sheet; A valve shaft connected to the disk through the valve body and the rubber seat; Butterfly valve equipped with a Teflon coated rubber sheet, characterized in that comprises a. The method of claim 1, A shaft hole for inserting the valve shaft is formed in the ring-shaped rubber sheet, a ring-shaped mounting groove is formed around the shaft hole of the ring-shaped rubber sheet, and a support ring is inserted into the ring-shaped mounting groove. Butterfly valve with coated rubber seat.

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