Polycontrols new seven chamber Gas Handling Unit uses Bürkert technology

Polycontroles Inc. of Quebec designed a seven chamber gas handling unit for an HVOF Plasma torch
installation at the University of Sherbrooke.



Bürkert's own legendary type 330 solenoid valve with it's unique pivoted armature system with media seperation was selected for it's high cycle life and process safety.

The high quality ultra compact type 2000 angle seat valve with it's high flow rate and low pressure drop with direct mounted type 6012 pilot valve was specified for worry-free gas service.

Application background:
High Velocity Oxy-Fuel Coating (HVOF) uses a combination of a fuel like kerosene, burning with large quantities of oxygen to produce a flame with a gas stream velocity in excess of 2000 metres per second. This can accelerate the particles of the coating being sprayed to around 600 metres per second, or roughly twice the speed of sound. Compared with plasma spraying, HVOF supplies the coating particles with most of their energy as kinetic rather than thermal energy, so fewer particles will oxidize in flight. In addition, the speed with which they hit the target ensures that any particles not fully melted are plastically deformed by the impact, which reduces any porosity in the resulting coating. The result is a coating with a high corrosion resistance.

*The HVOF spray process allows higher output with significant cost savings over vacuum plasma spraying, as there is no need to control the environmental chemistry and pressure around the component, and the cost of the capital equipment is greatly reduced. The HVOF process can also deal with a wider range of size, weight and geometry of components to be coated, when compared with vacuum spraying, as it is not restricted by the boundaries of a chamber. Consequently, items like gate valves, ball valves, steel mill rollers, mid-span supports for compressor blades and other high-integrity parts which are exposed to aggressive environments are being coated by HVOF methods, and the simplicity of the process makes it possible to carry out repairs and spraying operations on site.

Website URL: http://www.polycontroles.com/

Bürkert Area Sales Manager: George Anton
george.anton@burkert.com