Self-contained pressure regulators are sometimes called pressure reducing valves or pressure control valves. This is likely the case here. A steam letdown valve could also be a pressure reducing valve. Search the web for the "Fisher Control Valve Handbook". Someone here may post the link. Fisher is not the only supplier but offers a broad line of control valves and regulators. Fisher also publishes lots of good stuff. You can find them on the web somewhere under Emerson Process - Fisher-Rosemount. When sizing or selecting any control valve consider the pressure, temperature and materials in addition to the flowing capacity requirements. This is not covered in a single thread but a career. If in the USA obtain some piping standards such as ASME B16.5 to learn about flanges. Other standards apply in the EU countries and Asia. Do not appologize for being a cub. All of us were cubs once. Most of us are still learning.

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