Buying and Selling Unused, Used and Reconditioned Valves
A rotary valve (which can also be called airlock) is often used to enter or extract material from two chambers with different pressure levels. As part of an exchange process, the valve is often used as a measuring or metering device. A valve enables the passage of objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it. The lock consists of a small chamber with two airtight doors that do not open simultaneously. A valve may be used for passage between environments of different gases rather than different pressures, to minimize or prevent the gases from mixing.
A valve may also be used underwater to allow passage between an air environment in a pressure vessel and a water environment outside, in which case the airlock can contain air or water. Industrial valves are classified in many various ways. They can be distinguished by material of construction, media handled, and/or application. Most industrial valves are made of metal or plastic materials. Some industrial valves can handle abrasive materials, acids, adhesives, concrete, coolants, hazardous materials, high viscosity fluids, hydraulic fluids, or gasoline. Others are designed to handle liquid metal, lubricants, oil, powders, rendering wastes, solids, sludge, slurry, or steam. Examples of other types of industrial valves include back flow prevention valves, diaphragm valves, directional valves, diverter valves, double-flap airlock valves, rotary valves and knife valves. Industrial valves also include metering valves, mixing valves, pneumatic valves, pressure relief valves, shut-off valves, sampling valves or dispensing valves, safety valves, sanitary valves or hygienic valves.
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