Automatic directional valve device

Abstract

The invention relates to an automatic change valve, which aims at integrating a three way chamber with the reversing body into a whole toward less components and easy assembly. Moreover, a pressure chamber and a valve chamber of the reversing body are communicated via a fluid transmission passage for anti-freezing and quick response when used in cold regions. The invention is characterized in that: an output pipe (18) is vertically arranged at two supply pipes (17 a, 17b); a valve reversing body (10) is arranged between the supply pipes (17a, 17b) and the output pipe (18); a linkage (20) fixed at the valve reversing body (10) can determine whether the reversing is executed based on the position of a piston (24); a control diaphragm (30) arranged at the valve reversing body (10) for locking or unlocking a reversing tray (13); a resetting element (40) fixed at the valve reversing body (10) for manually rotating the valve shaft (12) and the reversing components (14) on the valve shaft (12). The valve chamber (11d) for mounting three-way valve (11) is positioned at the lower part of the valve reversing body (10); two holes (11e) are respectively arranged at ends of the valve chamber for connecting with the supply pipe; the fluid transmission passage (19) connects between a pressure chamber with the control diaphragm (30) and the valve chamber (11d). The control diaphragm (30) comprises: a control diaphragm (31) manually operated with a push for reversing; a diaphragm cover (36) covering the control diaphragm (31) and a third spring (37); a valve rod (33) outwards extending to the direction of the control diaphragm (31) and the reversing disk (13) inside the valve reversing body, then penetrating the diaphragm cover (36), a second cylinder (38) and a bolt (35); as well as the third spring (37) inside the diaphragm cover (36) to enable the valve rod (33) under the constant thrust away from the reversing disk (13).

Description

technical field [0001] The present invention is an auto-change valve device that automatically switches to the other side of the fluid supply pipeline when the fluid balance on one side of the two-way fluid supply pipeline drops below the specified pressure, so that the fluid is continuously supplied to the use side. apparatus). Background technique [0002] In order to continuously supply liquefied gas to the vertical steam pipe (vapor riser) of the liquefied (LPG) gas engine or the gas cooker, usually two LPG bombs (including the backup tank) are connected, and automatic reversing is installed in the gas supply circuit. valve. When the balance of the liquefied gas tank in normal use drops below the specified pressure, it will automatically switch to the standby liquefied gas tank as its pressure decreases. [0003] The automatic reversing valve device related to the above-mentioned technology is published in the Japanese Laid-Open Patent Publication No. 2000-39080. This ...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned automatic reversing valve device, in order to transmit the fluid pressure sent to the output pipeline to the pressure chamber of the reversing body, a fluid pressure transmission pipeline must be connected between the pressure chamber of the reversing body and the output pipeline.

[0006] In terms of structural characteristics, the above-mentioned fluid pressure transmission pipeline can only be placed outside the automatic reversing valve device.

Because the fluid pressure transmission pipeline is exposed outside, it is necessary to prevent freezing when used in cold areas, so it is bound to bring the disadvantages that the entire automatic reversing valve device must be covered with a protective cover for protection.

[0007] Moreover, the reversing body, connecting rod mechanism, control diaphragm mechanism, reset mechanism and valve chamber all need to be manufactured independently. There are too many components, which makes it more difficult to manufacture, and it takes a lot of effort to ensure its performance and quality during assembly. Product Confidentiality

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