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Check valve body suitable for acid solutions

An acid solution, check valve technology, applied in the contact parts between the valve element and the valve seat, valve details, valve device and other directions, can solve the problem of corrosion of the inner wall of the valve body, and achieve long service life and proper ratio. Effect

Inactive Publication Date: 2017-05-17
TONGLING JINGWEI FLUID SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the check valve passes through the acidic solution, long-term work will cause severe corrosion on the inner wall of the valve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] A check valve body suitable for acidic solution, comprising the following steps:

[0012] a) Prepare and cast molten steel with the following weight percentages: 2.14%≤C≤2.24%, 0.45≤Si≤0.65%, 0.5%≤Mo≤0.7%, 0.015≤P≤0.035%, 0.015≤S≤0.035%, 0.75 %≤Cr≤0.95%, 0.25%≤Co≤0.35%, 1.6≤Ni≤1.8%, trace ≤Cu≤0.20%, the balance is iron and unavoidable impurities;

[0013] b) After the molten steel is poured and formed, the valve body is heated to 550-600°C and kept warm for 1-1.2h. After the oil is cooled to 80-100°C, it is reheated to the temperature range of 620-660°C and kept warm for 0.6-0.9h. The controllable atmosphere heat treatment of the inner cavity of the valve is to pass the mixed gas into the heat treatment furnace, the nitrogen gas flow rate is 90-120ml / min, and the propane flow rate is 14-16ml / min;

[0014] c) Finally, spray acid-resistant paint on the inner cavity of the valve. The acid-resistant paint is composed of the following raw materials in parts by weight: 4.5 p...

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Abstract

The invention discloses a check valve body suitable for acid solutions. A method includes the steps of preparing and casting molten steel comprising, by weight percentage, C not less than 2.14% and not larger than 2.24%, Si not less than 0.45% and not larger than 0.65%, Mo not less than 0.5% and not larger than 0.7%, P not less than 0.015% and not larger than 0.035%, S not less than 0.015% and not larger than 0.035%, Cr not less than 0.75% and not larger than 0.95%, Co not less than 0.25% and not larger than 0.35%, Ni not less than 1.6% and not larger than 1.8%, Cu not less than a trace amount and not larger than 0.20%, and the balance iron and inevitable impurities. The alloy composition proportion of the valve body material is appropriate, an acid-resistant coating on the inner wall of the valve body has the acid-proof property, and therefore the check valve body suitable for the acid solutions is long in service life, safe and reliable.

Description

technical field [0001] The invention relates to the field of check valve preparation, in particular to a valve body of a check valve suitable for acid solution. Background technique [0002] Check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. When the check valve passes through the acid solution, long-term work will cause serious corrosion on the inner wall of the valve. Contents of the invention [0003] The object of the present invention is to provide a check valve body suitable for acidic solution, the material of the valve body has an appropriate ratio of alloy components, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K27/00F16K25/00C22C38/56C22C38/02C22C38/44C22C38/52C22C38/42C21D9/00C21D1/74C09D5/08C09D7/12
CPCC08K3/26C08K3/36C08K5/098C08K5/523C08K13/02C08K2003/267C09D5/08C09D7/61C09D7/63C21D1/74C21D9/0068C22C38/02C22C38/42C22C38/44C22C38/52C22C38/56F16K25/005F16K27/00
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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