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Needle valves are usually used in flow-metering applications, especially when a constant, calibrated, low flow rate must be maintained for some time, such as the idle fuel flow in a carburettor. Note that the float valve of a carburettor (controlling the fuel level within the carburettor) is not a needle valve, although it is commonly described ...
These types of valves are also known as automatic control valves. The hydraulic actuators respond to changes of pressure or flow and will open/close the valve. Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them.
The needle valve is typically situated within a clear polycarbonate or nylon housing to aid in oil flow rate adjustment. Some compressor oils and external chemicals can cause polycarbonate and/or nylon sight glass to be degraded and create a safety hazard
Accurate flow control with a needle valve relies on a constant inlet pressure. Most regulators have two stages. The first stage is a fixed-pressure regulator, which releases gas from the cylinder at a constant intermediate pressure, despite the pressure in the cylinder falling as the gas in it is consumed.
Globe valve, good for regulating flow. Uses a cylinder movement over a seat; Knife valve, similar to a gate valve, but usually more compact. Often used for slurries or powders on–off control; Needle valve for accurate flow control; Pinch valve, for slurry flow regulation and control; Piston valve, for regulating fluids that carry solids in ...
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure , temperature , and liquid level.
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