Three-valve manifold with protection function

Abstract

The invention relates to a three-valve manifold with a protection function. The three-valve manifold with the protection function is characterized in that a middle valve is a two-way valve and is named as a balance valve; the both ends of the balance valve are connected with three-way valves; the structures of the input end and the output end of each three-way valve are the same as the structure of the two-way valve; a channel of the another three-way valve is of a structure that the channel of the another three-way valve is communicated with an input channel of the three-way valves in this group when the input ends and the output ends of the three-way valves in the group are closed; the channel is communicated with an output connector of the other group and the channel is called as a feedback channel; the three-valve manifold is the same as the traditional three-valve manifold in appearance; the operation methods of the three-valve manifold and the traditional three-valve manifold are the same; the difference is that the balance valve is closed when error operation occurs; one of the valves at the both ends is opened and the other one of the valves at the both ends is closed; a medium pressure can be transferred to the two input connectors of a differential pressure instrument through the two channels, so that the differential pressure sensor is prevented from being damaged by the pressure at one end, and the security of the differential pressure instrument can be effectively ensured.

Description

Technical field: [0001] In the field of industrial automation, the differential pressure sampling of the orifice plate for flow measurement, the liquid level sampling of the sealed tank, the pressure loss experiment of the pipeline, the water level of the boiler drum of the thermal power plant, etc., must be measured by the differential pressure sampling test method, according to Relative to the distance and position of the two points, determine the specific differential pressure of the two points, such as: flow rate, liquid level, pressure loss, etc., that is, the required physical quantity is obtained through the measured differential pressure signal and the related physical relationship. No matter what type of differential pressure measuring instrument is, the necessary pipe fittings, valves, etc. are indispensable in the connection with the device under test. The three-valve group as the above-mentioned connection intermediate link is widely used in various industrial and m...

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