They are used for the operation of control circuits and fluid conduction in low and medium pressure systems. Threaded Bonnet Needle Valves are manufactured from threaded, rolled, or forgings of carbon steels or stainless steels. Carbon steel starts with bars according to SAE 1045 or forgings according to ASTM A 105N normalized or stainless steel bars according to ASTM A 276 Gr 316 or forgings according to ASTM A 182 Gr 316.
Both the wet and dry threaded stems are made of stainless steel with rolled threads to increase mechanical resistance and in the working area of the packing the termination is "mirrored" which greatly increases the life of the packing. Another notable feature for dry threaded shafts is the back seal, which, in addition to allowing repackaging under pressure, prevents the fluid from remaining in contact with the packing in normal operations, with a fully open valve, which is achieved. a longer duration of it.
In all versions, the gaskets are adjustable from external hexagonal pieces to the bonnet, considerably reducing maintenance costs.
On the adjustable parts there are colored plastic caps that allow a quick visualization of the quality of the manufacturing material and are an effective protection against the entry of foreign bodies.
Upon request, they are delivered with EN 10204-3.1 certi cate and supplied with NACE MR 01-75 materials
