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Manufacture method of rigidity seal ball valve

A manufacturing method and hard sealing technology, which is applied in the field of ball valve manufacturing, can solve problems such as the inability to solve the problem of the strength of the valve body, achieve the effect of maintaining stable geometric dimensions and performance of the valve body, eliminating stress in the valve body, and improving hardness

Inactive Publication Date: 2014-12-24
WUHU JINMAO FLUID TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional processing technology, the problem of the strength of the valve body and the hardening of the surface of the ball and the seat cannot be well solved.

Method used

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Embodiment Construction

[0013] A method for manufacturing a hard-sealed ball valve, comprising the steps of:

[0014] Step 1: casting heat treatment;

[0015] Step 2: Surface hardening of the ball and seat;

[0016] Step 3: Ball and seat cleaning treatment;

[0017] It is characterized in that: heat treatment of the casting: heating the casting to 30-50°C above the critical point during cooling, keeping it warm for 2-5 hours, taking it out of the furnace and cooling it naturally in the air; then reheating the casting to below the critical temperature 20-30°C, keep warm for 4-8 hours and then cool naturally in the air; the surface hardening treatment of the ball and valve seat adopts thermal spraying technology; the cleaning treatment of the ball and valve seat includes degreasing treatment and shot blasting treatment.

[0018] The thermal spraying technology includes surface pretreatment, preheating, spraying, and post-coating treatment; the surface pretreatment: remove all dirt on the surface of t...

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Abstract

The invention discloses a manufacture method of a rigidity seal ball valve. The manufacture method of the rigidity seal ball valve comprises the following steps: 1) casting thermal treatment; 2) ball body and valve seat surface hardening treatment; 3) ball body and valve seat cleaning treatment. In the step of casting thermal treatment, a casting is heated to temperature which is 30-50DEG C above a critical point during cooling, and the casting is taken out to naturally cool in the air after the casting is kept warm for 2-5 hours; then, the casting is reheated to the temperature which is 20-30DEG C below critical temperature, and the casting is naturally cooled in the air after the casting is kept warm for 4-8 hours. Thermal spraying technology is adopted for the ball body and valve seat surface hardening treatment. The ball body and valve seat cleaning treatment comprises ungrease treatment and shot blasting. According to the manufacture method of the rigidity seal ball valve, which is provided by the invention, valve body tissue stability is further improved, the internal stress of the valve body is eliminated, ball body and sealing surface hardness can be furthest improved, and the service life of the sealing surface under the states of high temperature, high pressure, corrosion and granularity medium is guaranteed.

Description

technical field [0001] The invention relates to a method for manufacturing a hard-sealed ball valve, which belongs to the technical field of ball valve manufacturing. Background technique [0002] At present, in thermal power plants, petrochemical systems, and high-viscosity fluids in the field of coal chemical industry, mixed fluids with dust and solid particles, and strongly corrosive fluids, ball valves need to use metal hard-sealed ball valves, so choose suitable metal The hardening process of the ball and seat of the hard-sealed ball valve is very important. However, in the traditional processing technology, the problem of the strength of the valve body and the hardening of the surface of the ball and the valve seat cannot be well solved. Contents of the invention [0003] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a method for manufacturing a hard-sealed ball valve. [0004] Technical solution: In order to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/001
Inventor 骆伟祥高峰
Owner WUHU JINMAO FLUID TECH CO LTD
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