Such a structure has the advantage of having a one piece body which can be moulded or machined in {HEAD ~ a single piece} and {TAIL ~ the assembling} of the assembly of the valve as well as its installation on a pipe by clamping flanges makes it possible to constitute the valve by means of simple parts without bolts or nuts 
Such a structure has the advantage of having a one piece body which can be moulded or machined in { HEAD ~ a single piece } and { TAIL ~ the assembling } of the assembly of the valve as well as its installation on a pipe by clamping flanges makes it possible to constitute the valve by means of simple parts without bolts or nuts
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