Inquiry (采购产品): Back Pressure Valve Hi, I am in the oil and gas industry. We have a gas field which is sour in nature. Wondering whether you can furnish me with some infor (spec. and cross-section drawings) of your available back pressure valves. thanks. alvin **** Hidden Message ***** alvin Ko 98000 MYS Company: Shell - Asia Pacific E-mail: hingko24@yahoo.com.au **** Hidden Message ***** hingko24@yahoo.com.au