library #fctvalve

Piston valves are closing-down valves in which a piston-shaped closure member intrudes into or withdraws from the seat bore

In this article, we try to demonstrate control valve design and sizing calculation.

A control valve is used in the oil and gas industry to regulate the flow rate of the fluid in a pipeline or process (and the related process parameters as pressure, temperature, and level) according to signals managed by a controller. The role of a flow control valve in the complex petrochemical process is key, as the multiple loops involved in the process should be kept under strict and dynamic control to make sure that the process, as a whole, works as intended and produces the desired output in terms of quantity, quality and time.

Rotary Actuators: Different Mechanical Styles There are 2 main styles of rotary pneumatic actuators for use on ball, butterfly and plug valves: Rack-n-pinion, and Scotch Yoke. While at first they may appear drastically different, they are actually quite similar. Both operate by converting the linear motion of a piston in a cylinder into rotational motion of the stem drive.

A valve actuator is a mechanical device that uses a power source to operate a valve. This power source can be electric, pneumatic (compressed air), or hydraulic (the flow of oil). There are two main types of actuators, one for each of the two main types of valves that require them. They are rotary and linear.

When control valve professionals talk about "control valve sizing," they really mean the entire process of selecting the valve that will do the best job of controlling the process. Selecting the right size valve is an important part of the process, but there are other equally important considerations as well.

There are quite a few different types of connections used to install valves and other process components in piping of process systems. While they all perform the same function of connecting the valve into the piping system and allowing it to perform its function, each connection type has its own pros and cons. The selection of the best valve connection type for your application is based on many factors: Factors for Selecting a Connection Type Pressure rating/system pressure Leakage prevention Ease of installation Permanence of valve Ease of removal for repair or replacement Inventory simplification Adherence to industry and/or plant standards Weight and size Cost Categories of Valve Connection Types There are 5 general categories that all connection types fall into. They are: Threaded Welded / Soldered / Glued Flanged / Lugged / Wafer Compression Union Manifold-mount

All of the most common types of automated valves fall into one of three main categories. They are linear, rotary, and self-actuated. There are a variety of valve types within each of these categories each having its own benefits. This training course is focused on rotary and linear actuated valves.

Comprehensive valve performance management provides monitoring and service for valves throughout a process or facility. In a webinar George Buckbee, head of performance solutions at Metso Flow Control USA Inc., described how this can work.

Valves are devices used to control the flow of a fluid stream. There are different kinds of valves used in plants based on the needs. Basically, Valves can be grouped into two main types: Shut off valves: They are ON/OFF valves either allow full flow or shut off completely. Shut off valves can be operated by hand or automatically. They are not used for controlling the flow. eg: Gate valves Control valves: These valves act as the correcting element of a control loop. Control valves are normally operated automatically, there are also hand operated valves. There are many types control valves eg: Globe valves, Butterfly valves, Ball and Plug valves, Pinch valves, Needle valves, Check valves,

Learn about the different types of valves used in the oil and gas industry and their differences: API and ASME gate, globe, check, ball, and butterfly designs (manual or actuated, with forged and cast bodies). Briefly said, valves are mechanical devices used in piping applications to control, regulate and open/close the fluid’ s flow and pressure. Forged valves are used for small bore or high-pressure piping applications, cast valves for piping above 2 inches.

Which are the key parts of a valve? It is a complex mechanical device manufactured by assembling a number of different components: the body (the pressure containing shell, made of cast or forged steel, available with flanged, threaded or socket weld connection to pipes), the bonnet, the trim (the disc, the seat, the stem, and the other wet parts), the packing and, the actuator (manual, gear, or automated).