Non-return device for pipeline port

A non-return device for a pipeline port, assembled at a tail end of a pipeline for drainage and insect and mouse prevention, comprising:

• a main body portion, the main body portion being of a barrel-shaped structure provided with a channel;
• and
• a non-return portion, the non-return portion being provided with a plurality of through holes, wherein the main body portion and/or the non-return portion is provided with a limiting structure, used to limit relative positions between the main body portion and the non-return portion;
• wherein the non-return portion is provided with a control block, and the control block is extended outward from a body of the non-return portion located within the non-return portion for manually controlling the non-return portion to move relative to the main body portion;
• a clamping block is arranged at a top of the main body portion, and the control block is provided with a first limiting bulge relative to the clamping block;
• wherein the control block moves relative to the non-return portion in a vertical direction, the clamping block and the first limiting bulge are controlled in a clamped manner and the non-return portion is slidably controlled;
• wherein the limiting structure comprises sliding grooves, the sliding grooves are formed on both sides of the main body portion or the non-return portion, and the main body portion and the non-return portion are slidably connected and mounted in a direction of the sliding grooves;
• wherein the limiting structure comprises flanges,
• when the sliding grooves are formed on both sides of the main body portion, the flanges are arranged on both sides of the main body portion, and the flanges match with a side wall of the main body portion to form the sliding grooves;
• “L”-shaped flanges are inwardly arranged on both sides of the main body portion;
• each of The flanges and the main body portion are integrated and set vertically with the main body portion;
• wherein a slot is formed in a bottom of the main body portion, the non-return portion is provided with a second limiting bulge relative to the slot;
• when the non-return portion is mounted at a preset position relative to the main body portion, the second limiting bulge is inserted into the slot.