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 pricing information regarding a 1-inch gate valve in black finish, specifically for the market in Pakistan. It would be great if you could include any variations in pricing based on materials or specifications, as well as any bulk purchase discounts available. Additionally, please provide insights on lead times for delivery, minimum order quantities, and shipping options. If there are any certifications or quality standards that your products meet, that info would be helpful too. I appreciate your prompt response as I'm keen to make a decision soon.