A rotational control valve controls the passage of fluid by regulating the passages in a transverse plug. The rotary valve is an obvious configuration, although not widely used. It can be classified as a type of spool valve where the ports move axially instead of circumferentially.
Fig 1: The rotary valve is an obvious configuration, although not widely used. It can be classified as a type of spool valve where the ports run axially instead of circumferentially
Fig 2: A somewhat better configuration is to employ a ‘solid spool’ with drilled through ports or the rotary plate valve.
Fig 3: A spindle or shaft rotates in a stationary housing. The shart is drilled axially and also vertically at the blind end to form a port whose position matches the inlet port in the stationary member. Again, the port opening(s) can be modified in length to provide overlap or underlap as required.
Typical rotary valve in that the valve design allows for transitional flow to occur when changing valve positions. Transitional flow eliminates dead-heading problems associated with positive displacement pumps.
Normally, the rotor valve consists of four types of flow with many combinations of flow pattern and ‘piggable’ versions. The stem and rotor are usually one piece which can eliminate the source of wear and repair common to the typical design of the ball valve
The full port diameter reduces the pressure drop in the valve, which increases the flow. An independent blade seal design eliminates the large cavities common to the ball valve and also the need for cavity fills, which still create watertight seams for the product to enter.
Valve flow pattern combination:
Rotor valves of this type are favored by a number of industries that include: food and beverages. pharmacist. chemical, petrochemical. refining, paper and paint, and particularly when fast attachment fittings are preferred for sanitary systems.