Many faced the issue of choosing reliable radiator
valves. What is their feature? What's the difference? Is this valve better, or
that one? I think that at least one of these questions sounded in your head.
Earlier I wrote about the subtleties of the choice of ball valves. Now came the
turn of the radiator valves.
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| Picture 1. Radiator valve with retaining ring of RBM |
What to
look for when to choose a valve?
Initially,
it is necessary to know to which of the types of pipes this product will be
connected. The standard view is a threaded connection. As a rule, the radiator valve
has an entrance to the radiator with external thread. The output is internal or
external. Also, there are universal products that allow you to connect to
different types of pipes: metal-polymer; pipes made of cross-linked
polyethylene or polypropylene; to copper pipelines for clamping or welding.
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| Picture 2 .Types of valve connection of different types of piprlines |
An
important element of the radiator valves is a collapsible joint. Some
manufacturers add to the design of this element - a retaining ring (option 4 in
pict. No. 3). It makes the installation of the valve quick, simple and
reliable (due to the seal). Sealers of fitting made of different materials:
teflon PTFE (pict.№3, 2), a special sealant HPF (pict.№3, 3), rubber (pict.№3,
4,5) and other. Polymer sealants (pict. № 3, 2,3) are more reliable and have a
longer service life in comparison with rubber ones.
To create
low-cost models, manufacturers only apply a notch on the thread (pict. 3, 1).
This stroke improves the adhesion of applied sealing materials (for example PTFE-tape)
with the return thread in the radiator.
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| Picture 3. Sealing options for union thread |
There are
models of a socket with faces for the key (pict. 3, option 5). This also
facilitates installation.
The
next point is the type of seals in the place where the union thread joins the valve
body. The most common is a variant with a rubber seal (pict. 4, - 1 and 2). Other
manufacturers use polymeric gaskets (pict. 4, 3 and 4). They are more durable.
The best option is the connection "metal to metal" (pict. 4, 5). Such
a design requires very precise surface treatment of metal surfaces.
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| Picture 4. Types of connection union thread with the body |
This
variant (pict. 5, 1) of the node design is also preferred in the case of the
valve overlapping unit. Although most manufacturers produce models with rubber
(pict. 5, 2).
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| Picture 5. Flow overlap nodes in the radiator valves |
When the
installation of the valves begins, it sometimes turns out that it is
inconvenient to assemble the union fitting. Since he has "ears"
inside it (pict. 6, variant 1). To avoid this, it is necessary to choose a valve
with an internal hexagon (pict. 6, variant 2).
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| Picture 6. Internal pass of the collapsible joint |
Radiator
valves may differ in the type of coating. Manufactured from brass, they can be:
uncoated (pict. 7, 1), with a protective layer of nickel (pict. 7, 2), chromium
(pict. 7, 3) or others. The coating makes the case corrosion resistant . And it
improves the design.
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| Picture 7. Fittings with different types of coating |
There are
original models on the market.
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| Picture 8. Design radiator valves |
It is worth
remembering the physical parameters of pressure and temperature.
And of
course it's important where the products are manufactured. The leaders are
companies from Italy. They have great experience and quality products.
Summarizing
the results, I will collect the ideal product:
1. Union
thread design: with a retaining ring with teflon seal on the union.
2. Inside
part of the fittings - hexagon.
4. The
outer shell is coated.
5. Manufacturer - Italy.
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