The high pressure range incorporates a pressure sealed bonnet design for reliable sealing. The valves are available in flanged or butt welded end connection. Valves can be provided with special features like water sealed gland for vacuum service, bypass arrangements for pressure balancing, special cleaning for oxygen service, multi start spindle for low effort operation, extended spindle for pit mounted / buried service, NACE compliant materials for sour service in petroleum industries, etc. The valves can be provided with motor operation wherever required.                                                                            http://www.oudian-valve.com/