Is there any difference between WC6 and WC9 valve material, where is the difference?

Is there any difference between WC6 and WC9 valve material, where is the difference?

The important parameter of the valve is the flow coefficient and cavitation coefficient of the valve, which is generally available in the data of valves produced in advanced industrial countries, and even printed in the sample. Our country produces the valve basically does not have this aspect information, because obtain this aspect of the data need to do the experiment to be able to put forward, this is our country and the world advanced level of the valve gap one of the important performance.
A, valve flow coefficient
The valve flow coefficient is a measure of the valve flow capacity index, the greater the flow coefficient value, the fluid flow through the valve when the pressure loss is smaller.
According to KV value calculation formula
Where: KV — flow coefficient Q — volume flow m3/h δ P — valve pressure loss barP — fluid density kg/m3
Two, valve cavitation coefficient
The cavitation coefficient δ value is used to determine what type of valve construction to choose for flow control.
Where: H1 — pressure mH2 — difference between atmospheric pressure and saturated vapor pressure corresponding to temperature M δ P — difference between pressure before and after valve M
The allowable cavitation coefficient δ varies among valves due to their different configurations. As shown in the figure. If the calculated cavitation coefficient is greater than the allowable cavitation coefficient, the statement is valid and cavitation will not occur. If the allowable cavitation coefficient is 2.5, then:
If δ > 2.5, cavitation will not occur.
When 2.5 > δ > 1.5, slight cavitation occurs.
When δ < 1.5, vibration occurs.
Continued use of δ < 0.5 will damage the valve and downstream piping.
The basic and operating characteristic curves of valves do not indicate when cavitation occurs, let alone the point at which the operating limit is reached. Through the above calculation is clear. Therefore, cavitation is produced because the liquid accelerates through a section of shrinking section in the process of flow, part of the liquid is vaporized, and the bubbles generated then burst in the open section after the valve, which has three manifestations:
(1) Noise
(2) vibration (serious damage to the foundation and related structures, resulting in fatigue fracture)
(3) Damage to materials (erosion of valve body and pipe)
From the above calculation, it is not difficult to see that cavitation is greatly related to the pressure H1 after the valve. Increasing H1 will obviously change the situation and improve the method:
A. Install valve low in line.
B. Install a orifice plate in the pipe behind the valve to increase resistance.
C. The valve outlet is open and directly accumulates the reservoir, which increases the space for bubble bursting and reduces cavitation erosion.
Comprehensive analysis of the above four aspects, summed up the gate valve, butterfly valve main characteristics and parameters list for easy selection. Two important parameters play an important role in valve operation.
Is there any difference between valve material WC6 and WC9? What is the difference? Valve material WC6 and WC9: BOTH WC6 and WC9 are alloy steel, they have basically the same mechanical properties, with the same tensile strength, yield strength and elongation at room temperature.
Valve material WC6 and WC9
Both WC6 and WC9 are alloy steels with basically the same mechanical properties and the same tensile strength, yield strength and elongation at room temperature.
The difference is the alloy content. Compared with WC6, WC9 contains more chromium and molybdenum, so its mechanical strength at high temperatures is better. In addition, WC9 has a better ability to resist scouring.