Cast Steel Gate Valve

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This article is about the flow control device. For the game developer, see Valve Corporation. For the electronic component also known as a christian louboutin vacuum tube, see thermionic valve. For other uses, see Valve.These water valves are operated by handles.A valve is a device that regulates the flow of a fluid by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but are usually discussed as a separateJerseys category. In an open valve, fluid flows in a direction from higher pressure to lower pressure.Valves are also found in the human body. For example, there are several heart valves which control the flow of blood in the chambers of the heart and maintain the correctCheap UGG boots pumping action.Valves are used in a variety of contexts, including industrial, military, commercial, residential, and transportation.The industries in which the majority of valves are used are oil and gas, power generation, mining, water reticulation, sewerage and chemical manufacturing.
plumbing valves, such as taps for hot and cold tap water are the most noticeable types of valves. Other valves encountered on a daily basis include gas cheap wow gold control valves on cookers, small valves fitted to washing machines and dishwashers, and safety devices fitted to hot water systems.Valves may be operated manually, either by a hand wheel, lever or pedal. Valves may also be automatic, driven by changes in pressure, temperature, or flow. These changes mayoil painting act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.More complex control systems using valves requiring automatic control based on an external input valvesrequire an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately, and allowing control over a variety of requirements.Valves are also found in the Otto cycle engines driven by a camshaft, tappets or push RODS where they play a major role in engine cycle control.