阿曼采购需求：高压截止阀（BW端），PSB高压截止阀，止回阀，旋启式止回阀，升降式止回阀，不锈钢止回阀

We're interested in sourcing a few specific items for our upcoming projects. We need two pieces of 300LB ball valves in both the 3" and 4" sizes, all with RF ends. Additionally, we're looking for one 300LB globe valve with an RF connection in the 3" size, and one swing check valve, also with RF ends, in the 4" size. Could you please provide us with your best pricing, lead times, and any relevant specifications for these items? We're aiming to make a decision quickly, so your timely response would be greatly appreciated. Thank you!