Processing method of eccentric sphere embedded plastic ball valve and product thereof

Abstract

The invention discloses a processing method of an eccentric sphere embedded plastic ball valve and a product thereof. The eccentric sphere embedded plastic ball valve comprises an eccentric sphere, a valve body and a driving mechanism and the invention provides a processing method thereof, wherein the driving mechanism drives the sphere to rotate. The eccentric sphere of the valve and the valve seat can be embedded in a die, and the valve body are integrally cast and shaped. The integral strength of the valve manufactured by the invention is higher than that of the valve body manufactured by the prior art, and the valve body stress is evenly distributed to lighten creep generated by stress concentration so as to greatly improve the durability of the ball valve. The ball valve has good sealing property, is easy to switch on and off, has accurate position, reduces processing steps, saves consumables and has obvious quality meaning and economic benefit.

Description

technical field [0001] The invention relates to a plastic ball valve structure, in particular to a processing method of an eccentric ball embedded plastic ball valve and a product thereof. Background technique [0002] Compared with traditional metal ball valves, plastic ball valves have many advantages such as light weight, convenient manufacture, low cost and corrosion resistance, and have been more and more widely used. [0003] Its valve body and spheroid part of existing plastic ball valve are all formed by direct casting of plastics. Due to the need to assemble the sphere, the plastic valve body used in the project is divided into two pieces on the left and right or three pieces on the left, middle and right, and is sealed with locking threads. [0004] Due to the material of the plastic ball valve under the action of large stress, it will undergo short-term deformation and creep deformation with time growth, which will cause negative changes in the various assembly d...

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Problems solved by technology

[0004] Due to the material of the plastic ball valve will undergo short-term deformation and creep deformation with time under the action of large stress, which will cause negative changes in the various assembly dimensions of the ball valve and affect the sealing effect

However, the plastic stress concentration of the bolt part of the mechanical connector technology is large, and the above two short-term deformations and creep deformation with time increase become more serious, which can greatly reduce the service life of the plastic ball valve and even cause sealing failure.

On the other hand, the process of manufacturing plastic ball valves using the valve body block method requires later assembly, which has the disadvantages of complex assembly process and high processing cost.

[0005] In addition, the existing processing methods of plastic ball valves have the following disadvantages: ①The valve body of plastic ball valves is a thick-walled part, and it is difficult to obtain the required precision from the casting machine at one time, especially when the selected material is slow crystallization. very random

②It is necessary to introduce mechanical processing procedures to achieve precision, but due to the large volume and irregular shape of the valve body, the processing is difficult; ③The number of parts of the ball valve is large and the production process is complicated; ④The requirements for assembly accuracy are high and the output efficiency is low; ⑤Take For valves processed by mechanical connector technology, the stress concentration of the valve body at the bolt position is very large. In order to reduce the stress level, the wall thickness of the valve body has to be increased, which directly leads to the amount of plastic used.

⑥Due to the large creep performance of plastics, the traditional plastic valve body will elongate with time under internal pressure, resulting in the failure of the sealing pair; ⑦In order to prevent the sealing problem caused by creep, the traditional valve adopts an enlarged sealing pair ⑧The interference of the sealing pair makes the valve switch operation extremely difficult and inconvenient to use; ⑨There are many consumables, long production cycle and high cost

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