![]() Gate valves are linear motion devices used open and close the flow of the fluid (shutoff valve). GATE VALVE: This type is the most used in piping and pipeline applications.ACTUATED: the valve is actioned via electromechanical devices, called actuators, that may be electric, pneumatic, hydraulic and gas over oil.MANUAL: the valve is operated manually, via levers, wheels and/or gears.The difference between steel casting and forging is explained in this article. FORGED (the body is manufactured by forging steel).The main casting materials for valves are listed in this article. CAST (the body is obtained by casting steel). ![]() ![]() Valves used in the oil and gas industry and for piping applications can be classified in multiple ways: VALVES BY DISC TYPE The valves’ market is worth approximately 40 billion USD per year in 2018, and major manufacturers are located in the US, Europe (Italy, Germany, France, and Spain), Japan and China. Valves with small bore sizes (generally 2 inches) or that require high resistance to pressure and temperature are manufactured with forged steel bodies commercial valves above 2 inches in diameter feature cast body materials. Filter debris flowing through a pipeline, to protect equipment that may be damaged by solid parts (y and basket strainers)Ī valve is manufactured by assembling multiple mechanical parts, the key ones being the body (the outer shell), the trim (the combination of the replaceable wetted parts), the stem, the bonnet, and an actioning mechanism (manual lever, gear or actuator).Protect a piping system or a device (pump, motor, tank) from overpressures (safety or pressure relief) or back-pressures (check valve).Regulate the pressure of a process (pressure reducing valve).Change the direction of the flow (for example a 3-way ball valve).Control the flow of the fluid (control valve).Modulate the flow of the fluid through the pipeline (example: globe valve).Start/stop the flow of the fluid (hydrocarbons, oil & gas, steam, water, acids) through the pipeline (example: gate valve, ball valve, butterfly valve, knife gate valve, or plug valve).The different types of valves used in the petrochemical industry suit any of the following applications:
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