Vacuum : Vacuum is negative pressure or suction, typically measures as Torr or mmHG, Micron, psia, inches mercury gauge, inches mercury absolute and kPa. The maximum possible achievable vacuum is -1 bar or - 1 atmosphere such as outer space.
Valve : A valve is a mechanical device designed to control, prevent or restrict the flow of gas or liquid media along a pipeline.
Valve Body : The valve body is the main part of the solenoid valve in which the connecting ports, seals and seats are located
Valve Specifications : Valve specifications include valve type, size, materials of construction, minimum and maximum operating pressures and temperatures, function, connection type and minimum and maximum operating and working pressures. Some valve specifications and dictated by globally recognised standards such as:
Velocity : Velocity is speed of an object, gas or liquid measured as distance over time. The velocity of a gas or liquid along a pipeline is commonly given as Ft/Sec or feet per second.
Vent Plug : A vent plug a threaded nipple or plug that is screwed into a pipeline or valve body, which when removed will allow the contents of the pipeline or valve cavity to vent out to atmosphere, so that the pipe or valve can be inspected or maintained.
Vertical Pattern : A vertical pattern valve is a valve whose ports (inlet and outlet) share a common axis (in line with each other) and are suited for mounting in a vertical position.
Viscosity : Viscosity of fluids can be measured in different ways, Say-bolt Universal Seconds, Engler degrees, Kinematic centistokes. See table below that show
Visual Position Indicator (VPI) : A visible mechanical indicator or arrow that shows the position of a valve, normally protected by a transparent plastic cover or shield.
Voltage : Voltage or volts is an electrical measurement or electromotive force, the difference of potential that would carry one ampere of current against one ohm resistance. Voltage (Volts) is a measure of force. Amperes typically a measure of electric current.
Volume : Volume is a capacity measurement usually measured in litres, gallons, pint or fluid ounces. Typically used to show how much fluid can pass through a valve over a given period.
Wall Thickness : The wall thickness of the material of a pressure bearing pipe, tube or pressure vessel. For example a pipe with an outside diameter (OD) of 25mm with a wall thickness of 2.5mm will have an internal diameter of 20mm. (25mm - 2x 2.5mm of pipe thickness each side).
Water : Water (H₂O) is typically a clear, transparent odourless liquid with density or specific gravity of 1, turns into a solid (ice) at 0°C or steam at 100°C at atmospheric pressure. water forms the sea, lakes, rivers and rain and is the foundation of life on earth. Water is the most common fluid controlled in process systems and there is a wide range of valves designed to control water. Water is available in many forms, such as sea water, clean process water and even pure or de-mineralised water. We drink water, wash with water, process food and drinks with water, even cool, wash and flush process systems with water.
Water Hammer : The audible effects of pressure waves generated by rapid changes in fluid velocity or speed