Situated at Howrah Kolkata West Bengal in India Joy Krishna Engineering Works is manufacturers & suppliers of Butterfly Valve As per IS : 13095/91. These products are suitable for various applications. . Features: Construction of Materials as specified in the drawing is standard specification which may be provided other than standard. Manufacturing range-50 mm to 300 mm NB. 50 mm to 150 mm NB Lever operated. 200 mm and above, gear operated.