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Plastic gate valve and preparation method thereof and application

A plastic and gate technology, applied in the direction of sliding valves, valve details, valve devices, etc., can solve the problem of not giving plastic gate valves, etc., and achieve the effect of reducing valve weight, energy consumption, and energy consumption

Pending Publication Date: 2020-05-26
HEBEI HUAMI RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is only an idea, and it does not give the type of valve that the plastic gate is applied to. In theory, this solution can only be applied to small valves with low water flow pressure, that is, valves with small diameters.

Method used

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  • Plastic gate valve and preparation method thereof and application
  • Plastic gate valve and preparation method thereof and application
  • Plastic gate valve and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Plastic gate valve of the present invention, as attached figure 1 As shown, it includes valve body 1, bonnet 6, gate plate and valve stem 5. The valve body is inverted T-shaped and has a hollow structure; the gate plate is located in the lower part of the valve body; one end of the valve stem is connected to the gate plate, and the other end is connected to the handwheel 9 connections; the hand wheel is set outside the valve body; the top of the valve body is provided with a bonnet connection port that matches the bonnet; the bonnet is fixedly connected to the valve body and the bonnet connection port is closed; the gate includes a gate frame 2 , the gate frame is arranged perpendicular to the bottom of the valve body, and closes the lateral part of the bottom of the gate; the outer surface of the gate is wrapped with a gate rubber 3 .

[0030] The bonnet and the gate are fixedly connected through the gate nut 4, and the gate nut is arranged on the outer surface of the ...

Embodiment 2

[0034] The gate frame of the plastic gate valve is made of plastic material, and the plastic material of the gate frame includes nylon or polyphenylene sulfide and glass fiber with a weight ratio of 35:65.

[0035] The tensile strength of the gate frame is 200-210MPA.

[0036] The preparation process comprises the following steps:

[0037] The gate mold is installed on the injection molding machine, and the plastic is heated and melted. The temperature is raised in five stages. The temperature of the five stages is 260, 270, 280, 290, and 298°C. The injection pressure of the injection molding machine is 12MPA, and the pressure is 9MPA. The pressure holding time is 5 seconds; the molten plastic is pressed into the mold by the screw, and cooled and shaped.

Embodiment 3

[0039] Install the gate plate prepared in Example 2 on a DN100 valve, close the valve and put it into the valve testing equipment, inject a certain water pressure into one side of the valve, keep it for 10 minutes, and check whether the water pressure decreases, that is, the valve Whether it leaks.

[0040]

[0041] Through the test, the plastic gate instead of the cast iron gate compared with the ordinary plastic gate, the plastic gate of the present invention can keep the water pressure on both sides of the gate constant, and the plastic gate of the present invention can be installed in the water pressure of 1.6MPa. on the valve.

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Abstract

The invention relates to a plastic gate valve. The material used in a gate plate framework is nylon or polyphenylene sulfide and glass fiber with the weight ratio of 35 to 65. According to the preparation method of the plastic gate valve and the application of a plastic gate plate on a valve, the valve comprises a valve body, a valve cover, the gate plate and a valve rod, wherein the valve body isinverted T-shaped and is a hollow structure; the gate plate is located in the lower portion of the valve body, one end of the valve rod is connected with the gate plate, and the other end of the valve rod is connected with a hand wheel. The top of the valve body is provided with a valve cover connecting port matched with the valve cover, the valve cover is fixedly connected with the valve body and closes the valve cover connecting port; the gate plate comprises the gate plate framework, the gate plate framework is arranged perpendicular to the bottom of the valve body, the transverse portionof the bottom of the gate plate is closed, and the outer surface of the gate plate is wrapped with a gate plate encapsulation.

Description

technical field [0001] The invention relates to the technical field of valve fittings, in particular to a plastic gate valve and its preparation method and application. Background technique [0002] Valve is an important part in industrial production, widely used in petroleum, petrochemical, chemical, metallurgy, water conservancy, municipal construction, water supply and drainage and other industries. The gate is an important component of the valve. Currently, the gate is mainly formed by casting. The foundry industry as a whole is an industry with high energy consumption and heavy pollution. As the country's requirements for the environment are getting higher and higher, the cost of castings in the casting industry continues to increase, and even castings are out of stock. [0003] The gate is a key part of the valve's water stop. Two key factors determine the strength of the gate: one is the material of the gate; the other is the structure of the gate. When the strength...

Claims

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Application Information

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IPC IPC(8): F16K3/02F16K3/30F16K27/08
CPCF16K3/0218F16K3/0263F16K3/30F16K27/08
Inventor 贾佳林张宏宾张青杨兴运
Owner HEBEI HUAMI RUBBER
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