Difference Between A Vented Ball Valve And A
Standard Ball Valve
Judging by what makes up the individual functions of these two
valves, the difference between a vented ball valve and a standard ball valve is
quite simple and obvious. However, the difference between these valves becomes
more critical when we consider the aspect of cryogenic processing.
Based on the application of ball valves for cryogenic processing,
surface level distinctions between these valves becomes less important. Now, it
is important to know beyond the simple differences and focus on understanding
why they are different.
Let’s take a look at why a vented ball valve is used for cryogenics
and the advantages of using it for this purpose.
Standard Ball Valve Vs. Vented Ball Valve
The most significant way in which the vented ball valve (commonly
called a cryogenic valve) differs from a standard ball valves is that a hole is
drilled into the upstream side of the vented ball valve. Generally, the
standard ball valve consists of a housing, a ball with a bore that allows the
flow of materials, a stem that controls the ball position and seals that the
ball rests between, but does not have a visible hole in the ball when the valve
is in a closed position. Apart from this (looking at the surface level at
least), there would be no significant difference between the two valves in how
they look and operate. When the ball is turned one way, the bore of the ball
allows upstream flow – where the flow of materials from one end (inlet) of the
valve to another (outlet) is permitted. When turned the other way, the flow of
material is totally halted.
The design of the standard ball valve is quite simple yet ingenious
and this makes it suitable for a numerous count of applications involving
different materials. When the standard ball valve is closed, the ball forms a
snug seal. Hence, it is ideal for water and other similar fluid applications. But
when it comes to cryogenic processing, the ball valve is not suitable as it can
cause leaking or valve failure. More importantly, in the event that a natural
process occurs in which the cryogenic process heats up, turns into a gas and
expands inside the valve, the standard ball valve could explode. This unwanted
pressure inside the valve is easily eliminated by the vented ball valve as it
disperses the pressure through the vent on the ball.
Now that we know how pressure builds up during cryogenic
processing,it’ll become easier to understand the major difference between these
ball valves. Vented ball valves can eliminate the problem of pressure build
during cryogenic processing, while, the standard ball valve cannot.
Conclusion
Without considering the cryogenic processing, the vented ball valve
and the standard ball valve both look and function in the same way. However,
this single difference between them is a very crucial and significant factor
that cannot be overlooked. Knowing this difference make it easier to answer the
question “why do you need a vented ball valve?”
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