A ball valve is a
product of the sanitary market that quickly and permanently entered the
household world. So to speak,
seriously and for a long time.
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| Ball valve |
Now the market has a
lot of offers from different manufacturers. Among this "bouquet" of
the assortment, it is increasingly difficult to orientate yourself in what
corresponds to the price / quality category.
Today, we remove many
white spots that are related to the marking of ball valves.
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| Dimensional designations |
DN - nominal diameter - this designation
determines the size of the pipeline fittings. The nominal diameter is adopted
for all elements of pipelines (mostly metal). Nominal diameters for ball valves
are defined in DSTU GOST 28338: 2008 "Pipeline connections and fittings.
Conditional passages (nominal sizes)
". Earlier, the diameter of the crane was denoted by the conventional
value of DN.
½ "- often the size of the crane is also duplicated in
inches." On small diameters, inches indicating strokes may fall. |
| Pressure designations |
PN - nominal pressure is the maximum pressure of a
working medium with a temperature of 20 ° C, at which a long product is
allowed, and in this case a ball valve. The
PN designation replaced the conventional pressure Py.
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| Pressure designations |
Ball valve importing
factories in the United States of America apply additional pressure marking for
their products - WOG and WSP (sometimes SWP).
The WOG symbol - shows that the valve can
be installed in different systems, with different working media: water, oil,
gas. Moreover, denotes the maximum working pressure of water vapor at 100 ° F.
Labeled in units of psi (pound-force per square inch). For example, 400WOG.
This standard can be
equated to European:
400WOG - PN30
600WOG - PN40
1000WOG - PN63
1500WOG
- PN100
WSP (Working Steam Pressure) - shows the water vapor pressure and reflects
the maximum nominal pressure level for the crane at the highest possible
temperature. It is labeled in the same way as the previous parameter - 150WSP
(sometimes CWP). |
| Pressure designations. WSP, CWP, WOG |
In simple terms, WOG and WSP
are pressure values for small and large temperatures. A valve rated at 600WOG /
150WSP must withstand 600 psi in a water or gas pipe and 150 when it is
installed in a steam supply system. The WOG value is always higher.
Another type of marking
relating to pressure is the MOP.
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| Pressure designations. MOP |
Analog PN. Measured in bars. It is used for gas fittings. The designation MOP5 means that the maximum working pressure of the ball valve is 5 bar.
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| Material designations |
СW617N - marking of the material of the case. CW617N - brand of brass according to the European standard EN12165.
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| Date of production |
05/11 - designation of the time when the
crane was released. The first number shows the month, the second - the year.
This marking is important from the point of view of quality control of produced
serial products.
Made in Italy - the place where the
product was manufactured. It is this "literal" marking that indicates
the place of origin of the ball valve.
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| Designation of the country of manufacture |
No other designation,
even "ITALY", means that the ball valve has Italian roots (for
example).
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| Vave with falsification |
Sometimes signs of
different standards are applied. Consider
the main.
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| UL mark |
UL Listed
Another standard comes from the United States. UL is issued by
Underwriters Laboratories. The presence of such a sign shows that the product
has been tested in a national testing laboratory and meets the requirements of
safety standards for products.
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| UL mark |
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| NSF mark |
The NSF 372 standard was introduced in 2011
to establish procedures to meet lead content requirements of 0.25% using the
average calculated surface area or simply using all lead-free materials for
areas in contact with drinking water.
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| CSA mark |
CSA sign
The Canadian Standard Association is the Canadian State Department, which
regulates the degree of products.
Products with the sign of CSA, are independently
tested, and after they receive certificates for compliance with safety and
performance standards. This Canadian Standard requires very stringent quality
control procedures. Confirmation of quality by this standard is an ongoing
process. Laboratory testing, as well as production
verification.
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| NL mark |
All products marked "NL"
or "LF" are made of
lead-free brass or copper.
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| CE mark |
CE Mark
The CE mark says that
the products meet the requirements of EU regulations and directives. CE is an
informal security guarantee for goods. It is obligatory for all goods coming to
Europe, falling under directives. But on the other hand is voluntary as a
certification for compliance with quality standards.
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