Autobiography of a Corporate Slave

A Check Valve, Non Return Valve or a One way Valve is a valve that normally allows fluid (Liquid or Gas) to flow through only one direction. Check Valves are two port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. Check Valves work automatically and most are not controlled by a person or any external control, accordingly, they do not have any valve handle or stem.   Check Valve Symbol on P&IDs. The Arrow shows the flow direction. Check Valves are automatic valves that open with forward flow and close with reverse flow. The pressure of the flow passing through the system opens the valve, while reversal of flow will close the valve. Types of Check Valves Swing Check Valve A basic Swing Check Valve consists of  a Body, a Bonnet and a disc that is connected to a hinge. The disc swings away from the valve seat to allow flow in forward direction, and returns to the valve seat, when u...

A Gate Valve is also know as Sluice Valve, is a valve that opens by lifting a round or rectangular gate/ wedge out of the path of the fluid. Gate valves are primarily designed to start or stop flow, and when a straight-line flow of fluid and minimum flow restriction are needed. In service, these valves generally are either fully open or fully closed. Construction of a Gate Valve Gate valves consists of three main parts: body, bonnet, and trim. The body is generally connected to other equipment by means of flanged, screwed or welded connections. The bonnet, which containing the moving parts, is attached to the body, usually with bolts, to permit maintenance. The valve trim consists of the stem, the gate, the disc or wedge and the seat rings. Discs of Gate Valve Gate valves are available with different disks or wedges. The most common types of Discs are : Solid Wedges Solid wedge is the most commonly used disk by its simplicity and strength. A valve ...

A  valve  is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. They perform any of the following functions.   Starting and stopping or isolating fluid flow. In an open valve, fluid flows in a direction from higher pressure to lower pressure.  Controlling or varying (throttling) the amount of fluid flow by change of direction or restriction.  Checking the flow or controlling the direction of fluid flow and preventing backflow. Regulating downstream system or process pressure. Relieving component or piping system of a certain pressure. The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll. Valves may be operated manually, either by a handle, lever, pedal or wheel. Valves may also be automatic, driven by changes in pressure,...