In any manufacturing process, design is the first step where most of the important decisions are made which affects the final cost of the product. In this paper the researchers have used Design for manufacturing and assembly (DFMA) to re-design a fluid flow control valve and optimized its design to ensure the reduced number of parts, safety, reliability, time to market and customer satisfaction. In this research work the main emphasis was given to the design stage of a product development to obtain an optimum design solution for an existing product, DFMA concepts were used to produce alternative design ideas and the rapid prototyping process was used to develop a prototype for testing and validation of these alternative designs. Optimum design, low cost and good quality with quick delivery was the outcome of this research work. © 2006-2014 Asian Research Publishing Network (ARPN).