Hydraulic fluid compositions

摘要

An aqueous hydraulic fluid composition comprising a first lubricant comprising at least one phospholipid and a second lubricant comprising an alkoxylate salt. The aqueous hydraulic fluid composition contains less than about 20% by weight (preferably none or substantially none) of an oil selected from the group consisting of mineral oils, synthetic hydrocarbon oils, and mixtures thereof. The use of alkoxylate salts provides increased lubricity and also acts as an emulsion stabilizer for the composition.

主权项

1. A method of actuating a valve in a marine environment using a hydraulic fluid composition, the method comprising the steps of:
a) filling a hydraulic line, which is connected to a valve, with a hydraulic fluid comprising:
i) a first lubricant comprising a lecithin;ii) a second lubricant comprising an alkoxylate salt; andiii) water; wherein the hydraulic fluid composition is at least substantially free of an oil selected from the group consisting of mineral oils, synthetic hydrocarbon oils and mixtures thereof and wherein the concentration of the alkoxylate salt and concentration of the lecithin in the hydraulic fluid are in a proportion to each other such that the alkoxylate salt is solubilized by the hydraulic fluid; b) applying pressure to the hydraulic fluid in the hydraulic line.