Joy Krishna Engineering Works Howrah Based Company is Manufacturers of Cast Iron(CI) Diaphragm Valves. An exclusive range of optimum quality Cast Iron Diaphragm Valve, which is aesthetically designed and precision-engineered for their higher performance and durable work life, is being offered to all our clients. In addition to this, all these Cast Iron Diaphragm Valves are rigidly tested on various quality parameters to deliver a flawless range in the market.