At first, water is used as working medium for hydraulic fittings, and later, a small amount of emulsion oil is added into water to increase lubricity and reduce corrosion. The function of working medium used in hydraulic fittings is not only to transfer pressure, but also to ensure that the working parts of the machine work sensitively, reliably, with long service life and less leakage.
The basic requirements of hydraulic fittings for working medium are as follows:
① It has suitable fluidity and low compressibility to improve the efficiency of transmission;
② Rust proof;
③ Good lubrication performance;
④ Easy to seal;
⑤ Stable performance, long-term work without deterioration.
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