Fine adjusting valve for square hole of plunger

Abstract

The invention relates to the field of liquid pipelines and provides a fine adjusting valve for a square hole of a plunger. The fine adjusting valve comprises a valve body, and the valve body comprises two cylindrical pipelines which are perpendicular to each other. The fine adjusting valve is characterized in that a rectangular square hole is formed in the cross position of the two cylindrical pipelines of the valve body; a plunger rod is arranged in the valve body; a valve core is fixed to the bottom end of the plunger rod through a connecting part, and the valve core extends into the square hole; the valve body is provided with a valve cover; the top end of the plunger rod penetrates the valve cover to be connected with a hand wheel; and a scaleplate and a locking nut are further arranged under the hand wheel. According to the fine adjusting valve, the plunger rod and the square hole form a flow regulating structure. When the plunger rod moves up and down, the lower end of the plunger rod and the square hole in the valve body can form a flow section which is in a rectangular shape always. Thus, the size of the flow section and the distance that the plunger rod moves up and down can form an oblique line with the unchanged proportion, and the flow of flowing medium and the moving relation of the plunger rod can form an approximate oblique line.

Description

technical field [0001] The invention relates to the fields of liquid pipelines and the like, in particular to a flow regulating valve. Background technique [0002] At present, the valves used to regulate the flow of liquid media in pipelines in my country are roughly divided into three categories: needle valves, cone valves, and gate valves. But these three types of valves all have many shortcomings that make users unsatisfied. 1. Needle valve: The opening for regulating the flow is too small, and it is easy to be blocked, especially for a medium with relatively high viscosity, it cannot be used at all, and its sealing structure is too simple, and it is easy to leak. 2. Tapered hole valve: the adjustability is too poor, the size of its flow rate is not proportional to the size of the opening, and the flow rate will become very large if there is a little gap, and its sealing structure is not good. 3. Gate valve: The gate of the gate valve is a wedge-shaped structure compos...

AI Technical Summary

Problems solved by technology

However, these three types of valves all have many disadvantages that make users unsatisfied.

1. Needle valve: the opening for adjusting the flow is too small and easy to block, especially for medium with relatively high viscosity, it cannot be used at all, and its sealing structure is too simple and easy to leak

2. Tapered hole valve: the adjustability is too poor, the flow rate is not directly proportional to the size of the hole, a little gap is opened, the flow rate becomes very large, and its sealing structure is not good

3. Gate valve: The gate of the gate valve is a wedge-shaped structure composed of a pair of slopes, which are sealed with the slopes. As long as the gate is activated upwards, the two slopes will leave the sealing surface, causing internal leakage and adjusting the flow rate. Unreliable; Secondly, the flow hole of the gate valve is a round hole. When the gate moves up and down, it makes the cross section of the flow into a moon-shaped surface composed of chords and arcs that are constantly approaching or withdrawing from the center line.

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