A Top Entry Check Valve with Replaceable Seat

Abstract

The invention discloses a top entry check valve with a replaceable valve base. The check valve comprises a valve body, the valve base, a valve deck, a valve clack and an O-ring; a screwing slope is arranged at the connecting position of the valve body and the valve base, wherein a 45-degree angle is formed between the screwing slope and the axis of a valve body channel, the valve base is clamped on the valve body, and the valve base and the screwing slope on the valve body are fixed through a screw; the O-ring is arranged at the position, where the valve base is connected with the vertical sealing face of the valve body, of the valve base. According to the top entry check valve with the replaceable valve base, as the screwing slope is formed in the valve body, wherein the 45-degree angle is formed between the screwing slope and the axis of the valve body channel, the sealing face perpendicular to the axis of the valve body channel is arranged, and the valve base is fixed to the valve body through the screw, while the screw is screwed in, the O-ring is compressed by component force, on the axis of the channel, of tension generated between thread pairs to generate elastic deformation so as to seal the valve base and the valve body, and the top entry check valve is convenient to machine, assemble and maintain and really meets the requirement for the replaceable valve base.

Description

technical field [0001] The invention relates to a top entry check valve with a replaceable valve seat, which belongs to the technical field of valve equipment. Background technique [0002] Check valves are widely used in power stations, petroleum, chemical, pharmaceutical, food and other industries. It can be used directly with imported equipment. The function of the swing check valve is to prevent the medium in the pipeline from flowing backward. The check valve is an automatic valve, and the opening and closing parts are opened or closed by the force of the flowing medium. Check valves are only used on pipelines where the medium flows in one direction, preventing the medium from flowing back, protecting the integrity of the upstream equipment, and preventing accidents. [0003] However, the traditionally designed swing check valve has a single structure, the middle cavity of the valve body is round and heavy, and the valve seat structure is mostly welded or screwed, wh...

AI Technical Summary

Problems solved by technology

[0003] However, the traditionally designed swing check valve has a single structure, the middle cavity of the valve body is round and heavy, and the valve seat structure is mostly welded or screwed, which is difficult to process and requires high precision. It cannot be replaced and repaired internal parts of the valve seat. If the valve seat needs to be replaced, the pipeline must be shut down, the valve must be removed from the pipeline, the welding seam or thread will be cut with processing equipment, and the thread will be re-welded or processed, and the valve will be tested after the parts are reassembled. The maintenance or production cycle is longer , the labor cost is very expensive, and its application range is greatly limited

[0004] The seal between the traditional check valve body and the bonnet is usually a single seal. Once it fails, it will immediately increase the probability of fluid leakage to the environment, thereby polluting the atmosphere.

[0005] The middle cavity of the valve is too round and bulky. Even if the peripheral drive mechanism is configured, the valve disc cannot be fully opened, that is, the valve body channel cannot pass through the pig or pipeline test, which affects the application and service life of the valve.

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