Patent ID: 7765951

Claim:
Device for pneumatically milking a cow, comprising a number of milk extractors, each comprising a teat cup as well as a milk line connected to the lower end of the teat cup, said milk line leading from the teat cup to a collection chamber for discharging the milk from the teat cups, the device being provided with a supply for a cleansing medium to the teat cup for each milk extractor, the supply comprising a supply line having an end portion with discharge end, and each milk extractor being provided with a linear reciprocating closing body for closing off the passage of the milk extractor downstream of the discharge end of the line for cleansing medium, when the cleansing medium has been discharged through the discharge end and into the milk extractor, wherein the closing body can be moved between a retracted position leaving the passage of the milk extractor free and an extended position closing it off, the closing body being provided with a squirt line forming the end portion with discharge end and being positioned to debouch into the milk extractor when said closing body is in the extended position, wherein the discharge end is located on the closing body so as to be out of fluid communication with the milk extractor when said closing body is in the retracted position and wherein the closing body is a piston that is bearing mounted in a sliding manner in a chamber which has an end edge that is provided with a sealing for sealing engagement of the circumference of the piston so that the discharge end is out of fluid communication with the milk extractor when said closing body is in the retracted position.