Lecture+3.++Fittings+and+Pumps - UNIVERSITY OF CALIFORNIA...

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UNIVERSITY OF CALIFORNIA Department of Viticulture and Enology VEN 135 WINE TECHNOLOGY AND WINERY SYSTEMS 3. VALVES, FITTINGS, PUMPS, AND MIXERS The presence of skins, seeds, some stem fragments, and other suspended solids requires specially consideration for the type of valves, fittings and pumps that are chosen for winery applications. A further consideration is the ease of cleaning for each of these system components. This includes the materials of construction, finishes, and design of each of these components as in Chapter 2. VALVES The use of valves can range from simply open and shut positions, in which the nature of the flow channel is not of importance, to flow control valves in which there is a precise relationship between the valve stem position and the permitted flow. In other words the two main functions of valves are “blocking” and “controlling.” A common feature of some winery tank designs is the use of flange and clamps fittings that allow the valve to be removed for cleaning. However, some valves will be welded in place, and therefore, will require more stringent attention to cleanability. Ball Valves Ball valves (Figure 3.1c) can be described as a cube through which the pipe passes from one face to the other that is parallel to it. In the center of the cube is a sphere (or ball) through which a hole, the diameter of the pipe, has been created. When this hole is aligned with the pipe, the flow is unobstructed and when it is turned through 90 ° , the pipe cross-section is completely closed and outer part of the ball is exposed to the process stream or environment. The quarter-turn operation in either direction makes these valves well suited for manual operations where rapid operator action is necessary based on oral/ visual cues (e.g. someone seeing or being told to close a valve when a change in color in a stream). These valves are recommended for all lines that will handle musts and pump- over operations since they are not able to be blocked by skins when fully open. An additional feature of ball valves is that they permit the introduction of a mixing impeller through the fully-open position even though the tank contains juice or wine. This allows the mixer to be used on several tanks rather than being dedicated to only one. Ball valves are usually low maintenance (the handles are usually the first to go). Ball valves are generally cleanable except for the seat around the ball. Therefore, they are considered cleanable for the wine industry (and food and beverage industries, but not for pharmaceutical applications). However, special attention needs to be given to how and when the outer part of the ball will be cleaned. Butterfly Valves
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UC Davis VEN 135 Butterfly valves (Figure 3.1b) can be described as a disc that is mounted in the center of a section of pipe. When fully-open the disc is seen to be side-on and simply a thin wall from the top to the bottom of the pipe. When fully-closed (using a quarter turn of the handle), the disc is seen face-on and it completely blocks the pipe. The
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Lecture+3.++Fittings+and+Pumps - UNIVERSITY OF CALIFORNIA...

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