In the previous
article, I began to acquaint you with my hit parade of unusual ball valves.
Today I will describe to you the second five participants.
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| Ball valve of Giacomini |
The patented design of the shutter has an unusual shape of the cube.
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| DADO ball from Giacomini |
A special form is
designed to eliminate the effects of sedimentation of the working environment.
There is a view of salt, scum, microrusor, etc. Such formations predominantly
appear and accumulate on the outer surface of the shutter spheres. And over
time, it complicates the opening / closing of the cranes. In consequence of
this, the saddle rings and the polished surface of the balls also can be
damaged.
In the Giacomini valves
with DADO shutters, the faults are localized to the locking element cavities
intended for this purpose. This solution increases the resource of the product
several times.
Further, we will be
acquainted with one more Italian giant Caleffi.
In my chart came a valve with a built-in back-flow valve Caleffi Ballstop 327.
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| Caleffi Ballstop 327 |
It's impressive how engineers could combine two elements in a small package. The check valve is located in the cavity of the lock ball. It works under the influence of simple hydraulic laws.
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| Ball valve Caleffi Ballstop 327. Principle of operation |
In addition to the main
functions (overlapping of the flow of the medium and protection from the
counterflow), this model of the valve allows you to do maintenance without
overlapping the entire system, and also to remove air. To do this, just set the
handle to the position of 45 ° C.
Next comes a
representative of the already familiar company Bugatti. This time it's a
California 255 ball valve.
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| Bugatti ball valve |
Again, the ball valve has a unique design and function - automatic drain. The locking element has an opening through which the working medium drains out. Accordingly, there is also a drain hole in the bottom of the tap body. The automatic process is possible when the product is completely closed.
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| Scheme of operation of the Bugatti California 255 crane in automatic drainage mode |
The fourth figurant of
today's list is the Enolgas Basic HT
valve.
The uniqueness of this
work of Italian engineers from the province of Brescia lies in the thermal
stability. The crane can operate at a working medium temperature of 170 ° C.
and what is even more surprising in the design of the handle is an indicator
that displays the exact temperature! It
is made of galvanized steel.
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| Enilgas ball valve |
In addition to this,
the stem assembly has an anti-blow-out over-protection.
And the last element of
the rating is the Spanish valve ARCO
Tajo 2000 Antical. Briefly about the company. The year of its foundation
was 1973 year. The head office is located in the province of Valencia. ARCO is
the leader in the market of stop valves in Spain.
So, I represent the development of the Spaniards - a ball valve with a
brass locking element with Teflon coating. |
| Tajo 2000 of ARCO |
This development
reduces the influence of calcareous and salt deposits on the surface of the
shutter. PTFE PTFE coatings and provides this function. Such a system is called
the Viraq system.
Also ball valves of
this series have increased resistance to pressure. The working pressure is 50
bar. The test pressure is 75 bar!
I will sum up my
rating. So, there are:
1. Giacomini DADO with
a cubic ball
2. Caleffi 327 with
integrated check valve
3. Bugatti California
255 with automatic drainage function
4. Enolgas Basic HT
with integrated temperature display
5.
ARCO Tajo 2000 Antical with Teflon-coated shutter bowl
And I will add participants from the
first part:
6. Bugatti ECO-GREEN with perforated
shutter
7. ARCO TajoPRO with double handle
8. Rubinetteries Bresciane Eurofly with
butterfly valve
9. Apollo and its 5-way cranes of the
series 78-124 and 78-125
10. Mofem Flexum with a single body and
thermostatic valve.
I suggest you take part in a small poll and
select a valve, which in your opinion is the most unique. Put in the comments
the appropriate figure. And at the end of the vote I like the outcome of it.
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