Pressure adjusting assembly for natural gas pipeline

Abstract

The invention discloses a pressure adjusting assembly for a natural gas pipeline. The pressure adjusting assembly for the natural gas pipeline comprises a stop valve, a pressure adjustor and a valve port communicating with a front pressure adjusting section and a back pressure adjusting section. A stop valve element of the stop valve is connected with a locking mechanism which is unlocked through gas pressure after pressure adjustment. The stop valve element forms blockage pressure through a stop drive spring. The pressure adjuster is provided with a main valve element driven by a primary self-balancing structure, and the main valve element is only movably arranged on a shell of the pressure adjustor. The lower end of the main valve element is connected with a secondary self-balancing auxiliary valve element assembly. The auxiliary valve element assembly comprises an outer cylinder and an inner cylinder. A leather bag is arranged on the lower end face of the inner cylinder. A T-shaped auxiliary valve element is arranged in the middle of the inner cylinder in a penetrating manner. The upper end of the T-shaped auxiliary valve element abuts against the main valve element in a connected manner. The T-shaped auxiliary valve element forms a secondary self-balancing structure through the leather bag and a compression spring. The pressure adjusting assembly for the natural gas pipeline has the beneficial effects that the pressure adjustor forms the double self-balancing pressure adjusting structures which are mutually superposed; and the stop valve is of a purely mechanical structure, and therefore potential safety hazards caused by sparks are avoided.

Description

technical field [0001] The patent of the present invention relates to a pressure regulating assembly, in particular to a pressure regulating assembly for natural gas pipelines. Background technique [0002] Pressure regulating components generally include a shut-off valve and a pressure regulator. The shut-off valve is used to shut off the fluid medium. The pressure regulator is a valve adjustment device for adjusting the fluid pressure. Control the fluid flow to achieve the purpose of pressure adjustment. Existing shut-off valves usually use a pressure switch to control the start of the shut-off valve, which is opened by electromagnetic force, and there is a potential safety hazard of sparks generated by electrical components. The existing pressure regulator changes the size of the flow section by changing the distance between the spool and the valve port. The spool of the existing pressure regulator drives the spool to move through the pressure regulating mechanism to rea...

AI Technical Summary

Problems solved by technology

Therefore, the pressure-bearing area of ​​the start-up is smaller than the normal pressure-regulating state, which will inevitably cause the start-up of the secondary balance spool to be insensitive to pressure changes, and the pressure-balanced spool reciprocates more times, the secondary balance time is long, and the pressure regulation accuracy is difficult to meet. Design requirements

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