The SS & DI butterfly valve is installed for controlling the flow of fluid and is named after the butterfly-shaped disc mounted on the shaft. The elements in the structure of the valve vary depending on the temperature, type of the fluid and pressure. Easy on-off, volume smallness, low weight and low-pressure loss are the chosen reasons for using the valve. The butterfly valve closes by rotating disc near the shaft placed on the vertical axis. The sealing is given between the elastic or plastic sealing elements or the metal flap overlaying the inside part of the body. The sealing component also works like a gasket in the collar between the pipe and the valve. Benefits of this valve are easy opening and closing, low-pressure losses, lightweight, space-saving and good sealing.
The body comprises of a small gearbox, with a flap combined with the shafts and designed in relating with the closing and opening of torque capacities.
SS & DI Butterfly valve are devised to demand minimum maintenance. The gear parts are properly greased and are maintenance-free. Gear parts must be handled with care and check of mechanical position indicator is required when opening and closing the valve. Flywheel needs not to be forced after the full opening and closing of the valve. Large gear proportions can break this gear part. After the active use, valves should be opened and closed at least once in six months.
The pipeline has to be depressurized, deactivated and required precautions require to be taken to stop the line from involuntarily starting at the spot where inspection, maintenance or repair will be performed. If important, remove the line. All required anticipations have to be taken according to the application and type of the fluid.
Gearboxes, bearing caps and valves need not be removed with the pressure on the line. Repairs and maintenance should be done by trained personnel. Necessary cares have to be taken and caution signs should be located around the effective area. Facility management required to get informed of unplanned or planned repair or maintenance work and mandatory permissions should be obtained.
All essential safety equipment, helmets, work boots, goggles, belts, insulation materials, gloves, etc. needs to be available and used.