Abstract: A stop valve is disclosed which includes a means for venting fluid to the exterior of the valve housing if the valve is not properly adjusted, thereby providing a readily detectable visual indication that the valve needs to be readjusted or retightened. In another aspect, the invention includes a hygienic shutter assembly which seals the juncture between the shutter and its associated backing plate in a manner which eliminates crevices and sharp angles within which dirt and debris can accumulate.

Abstract: A group valve for selectively connecting two liquid supply lines separately to a container. The valve comprises a housing with three chambers, one of which is separately connected to the others communicating with a respective liquid line. In each chamber there is a rotary slide, said slides cooperating to at each particular time open one line and close the other. In order to prevent leakage from one line to the other said two chambers communicating with the liquid lines, respectively, are provided with an outlet to the atmosphere, said outlet of each chamber being closed by the rotary slide when the liquid line is open and open when the line is closed.