Air Pressure Amplifiers can be as low as 5 psi or as high as thousands of psi. Shop air helps for the amplifiers so they require no electricity, cooling water or lubrication. The boost ratio is based on the supply air pressure.
An air pressure-reducing valve is an automatic control valve. It is designed to reduce a higher inlet pressure to a lower constant outlet pressure regardless of fluctuating flow rates and/or varying inlet pressure. It is a pilot controlled, hydraulically operated, diaphragm actuated globe valve in either the oblique (Y) or angle pattern design. Valve differential pressure powers the diaphragm actuator open or closed. The lower control chamber is connected through a fixed orifice to the downstream pressure, which serves to cushion the closing of the valve.
Air purifiers are machines used to purify air in home, aero planes and chemical plants. Air has pollutants such as carbon monoxide, nitrogen dioxide, formaldehyde, and smoke. Ozone and electrostatic air purifier equipped with fan produce less noise and are effective. Ozone is more effective in removing odor. Electrostatic purifiers use electricity to produce positive charge and attract all the negative charged pollutants. Electrostatic precipitation air purifiers produce negative charges and impart them to passing pollutants. The positive plates collectors attract them. However these purifiers are unable to collect allergens because they do not remain air borne for a long time. Once they get settled it is impossible to remove pollutants.