Importance

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Abstract

An improvement in a water chiller of the kind used for industrial processes such as electrical discharge machining (EDM). The chiller includes a reservoir for water (frequently de-ionized water), an evaporator, refrigerating apparatus such as a condenser and a compressor, and a pump; there is a supply line connection to an electrical discharge machining apparatus or other industrial process apparatus, and a return line connection. The pressure in the return line is usually lower than the pressure in the supply line. The improvement includes a fitting connected in series in the supply line and a bypass line connected to that fitting to afford a bypass flow of water in parallel with the process apparatus. A flow-limiting orifice member in series in the bypass line limits the bypass flow to a predetermined rate; the rate may be determined by the pressure differential between the supply and return lines. All fittings are formed of non-ionizing resins such as nylon; the orifice member is stainless steel. There is no valve in the bypass.

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First Claim