FAQ technical product details
Many questions have been asked several times. Here some important questions and answers at a glance.
Electroplating refers to processed for the electrochemical deposit of metallic coatings onto metallic or non-metallic substrates. Electro-crystallisation is carried out in an aqueous solution of metal salts, either by the external application of direct current (method I), or without the use of current by means of the reaction of the metal ions with a reducing agent (method II). The components of HEROSE safety valves are given a high-gloss nickel plating by means of method I. Although methods which do not use current, e.g. chemical nickel, plate all surfaces which are wetted by the electrolyte, they do not provide the required degree of gloss.
With chrome plated components, an additional chrome plating process is carried out after electroplating with nickel as described above. The depositing of chrome onto the component is once again carried out by means of direct current from an external source.
According to AD 2000 data sheet A2 and DIN ISO 4126-1:2004, safety valves must close within a pressure reduction below the triggering pressure of 10% for compressible media and 20% for incompressible media.
Mounting bonnet-body – torque moments
Locking torque for safety valves, plug screw and blow-out disc at divertor valves