巴基斯坦采购需求：PVC球阀、PVC底阀、PVC接头、PVC单接头球阀、PVC双接头球阀、PVC管件

I'm looking for detailed information on a specific diaphragm valve for a pressure control application. The valve should feature a rolling diaphragm and needs to fit a regulator size of DN50. I'm interested in finding a suitable replacement for an old part number, which is crucial for compatibility with our existing equipment. Additionally, please provide specifications related to the parent equipment, such as model classifications and any relevant manufacturer details. We rely on this information to ensure seamless integration and performance. Looking forward to your prompt response with the product details and any options available for procurement.