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Stainless steel ball for valve

Update:29-11-2019
Summary:

There are usually two types of stainless steel balls us […]

There are usually two types of stainless steel balls used in valves:

One type of valve is a spherical type, that is, a concave type. The characteristic of this valve is that the surface is in contact with the ball, which is good for sealing;
Another type of valve is cylindrical. This valve is easy to process. The valve and the ball are line-sealed. This requires higher accuracy of the ball and valve.

Stainless steel balls for valves are usually 304 stainless steel balls, 316 stainless steel balls, 440 stainless steel balls. The advantage of 304 is that it is relatively cheap and has good rust resistance. 316 has better rust and corrosion resistance than 304, such as Seawater, as well as corrosive liquids and corrosive gases, must be selected from 316 stainless steel beads or 316L stainless steel beads. Of course, if the valve pressure is relatively high and high accuracy is required, then 440 material must be used because 440 stainless steel beads High hardness and high precision, hardness can reach HRC58 or above, hardness can reach G10.

Of course, if the valve has higher requirements, such as the use of petroleum equipment, it is necessary to choose hard alloy balls, hard alloy balls are also widely used in various valves, have good wear resistance and corrosion resistance, but Cemented carbide balls (tungsten steel balls) have two characteristics, one is high hardness, fear of large changes in temperature, that is, fear of rapid cooling and sudden heating, and the specific gravity, density 14.9-15.1, not suitable for some parts A valve is a gas or liquid that can't afford a valve.

Ceramic balls are also a good type of ball used for valves. Ceramic balls have the characteristics of light specific gravity, high hardness, no fear of high temperature, corrosion resistance, wear resistance, etc. Silicon oxide ceramic balls are better, but the cost is higher.