Check type meter joint

Abstract

The invention discloses a check type meter joint, which comprises a joint screw nut and a connecting pipe, wherein the joint screw nut is connected with a meter tool through screw threads, the connecting pipe is used for being connected with a pipe fitting, the part of the inner end of the connecting pipe in contact with the joint screw nut is provided with an annular convex shoulder, the outer end of the joint screw nut is provided with a baffle edge matched with the annular convex shoulder, the end part of the inner end of the connecting pipe is provided with a sealing ring seat, the end part of the outer end of the connecting pipe is provided with screw threads matched with the pipe element in a surrounding way, an inner card of the connecting pipe is provided with an inner core capable of forwards and backwards moving in the axial direction under the external force effect, one end of the inner core is provided with a plug with the surface covered by flexible materials, a retainer ring realizing the sealed matching with the plug is arranged on the inner wall of the connecting pipe, the inner side part on the inner wall of the connecting pipe, near the retainer ring is provided with a circle of annular groove, a cavity is formed in the inner core, the cavity is provided with an opening in the medium circulation direction, and the side wall of the inner core is communicated with the cavity of the inner core for forming a circulation passage for medium circulation. The meter joint has the advantages that the check structure is simple, the circulation area is large, the lockage cannot easily occur, the service life is long, and the cost is saved.

Description

technical field [0001] The invention relates to gas, water and liquid measuring meter components, in particular to a meter joint with check function. Background technique [0002] At present, when tap water or gas is used, a meter will be installed to measure the consumption. However, in the traditional installation process, the meter is installed after the inlet end is connected with a meter joint by a straight-through ball valve. Then connect with the inlet end of the meter, so as to achieve the on-off control of the meter. In the tap water pipeline, a check valve is usually installed in front of the ball valve to prevent the medium in the pipeline from flowing backward, or the water source of the user's water tower is diverted due to the water supply stoppage, so as to prevent the meter from being reversed or damaged. [0003] The use of these check valves increases the number of connecting parts in the pipeline, resulting in high cost, slow construction speed, and incre...

AI Technical Summary

Problems solved by technology

[0003] The use of these check valves increases the number of connecting parts in the pipeline, resulting in high cost, slow construction speed, and increased safety hazards such as leakage.

Furthermore, the existing check valves usually have an inner plug in the valve body. When the reverse flow occurs, the end of the inner plug and the valve body achieve a sealing fit. When the forward flow flows in, the medium flows in from the end of the inner plug. The two sides of the inner plug flow out, and the medium can only flow between the inner plug and the inner wall of the valve. The flow area is small and it is easy to cause blockage; The forward force of the inner plug increases the flow area of ​​this structure, but it is easy to damage and reduces the service life, and the spring is in a compressed state for a long time. When the medium is diverted, it will give the inner plug a pulling force to prevent It moves so that the valve cannot be closed in time

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