Jargon Buster - V

Where pressure is lower than atmospheric pressure.
Vacuum breaker
A type of valve which is design to protect plant and equipment from damage when vacuum conditions are experienced. When a system cools some parts of the system may experience vacuum conditions, a vacuum breaker should automatically open and let air in so that the vacuum condition does not cause damage.
Valsteam Adca Engineering SA
A company which manufactures a range of steam products (steam traps and valves etc.). The company is based in Portugal.
A type of pipe fitting. Valves can be used to stop the flow of a medium or to control it. They come in many different types and sizes depending on the application.
Vent head
A device typically fitted to the top of a vent pipe. Its role is to dissipate the velocity of vapour ejected to atmosphere. It would typically be used on the vents from vented condensate recovery units.
The resistance of a fluid to flow when subjected to a sheer stress.
Viton is fluorocarbon rubber used for ‘O’ rings, inserts, diaphragms, sleeves, etc. It is a registered trade mark of DuPont Performance Elastomers L.L.C. It is generally specified for higher temperature applications. Advantages are resistance to erosion and corrosion, and the ability to give a leak tight seal. Reference should always be made to manufacturer’s recommendations prior to specifying and use.
Volumetric flowrate
The rate of flow expressed as a volume.