It is required some times to know the position of the valves by an electrical signal. One or Two Limit Switches are provided depending on the requirement to know if the valve is open or closed. The Valves come with complete bracket for mounting of the limit switches. Also a physical color indicator is provided to know the position.
This valve is used on Blast Furnace to view the flame quality. Usually a Sight Glass is provided for this purpose which is always exposed to the high temperature of the furnace, leading to frequent breakages. To avoid this, a Ball Valve is provided which protects this Sight Glass as the Valve is opened only when the flame quality is to be checked. As the Sight Glass is not subjected to high temperature for long durations, it last longer.
Many industries encounter problem of residues in the ball valve. These residues contaminate the media and hinder the operation of the ball valve. In cases where the fluid is meant for human consumption, it becomes all the more dangerous as it may contaminate and make the fluid toxic. In cases where the media changes from time to time, such as color of paints, the residual paint contaminates and changes the color.
Stainless Steel Investment Castings are sand blasted to remove grinding / filing marks and other irregularities. This leads to blackening of the castings. Usually these castings are assembled as it is, making the ball valve look darkened. Some customers complain that the valves do not APPEAR like stainless steel. To solve this problem the valves are electropolished to give them a bright look.
Usually to fabricate ball valves, where standard castings are not available, welding is preferred. Welding poses some major challenges, such as formation of heat affected zones which may have different material properties and color. Improper welding can also lead to leakage and rework. Moreover, the reworked valve's appearance is unacceptable. To overcome this hurdle, a new technology to join the flanges was developed. Here the flanges and valve bodies are screwed together and machined to eliminate gaps. These bonds are leak-proof and the appearance of the valves is excellent.