What is a vee ball valve?
What is a vee ball valve?
The Vee-Ball valve combines globe valve ruggedness with the efficiency of a rotary valve. The Vee-Ball valve is a segmented ball valve which features a contoured segmented V-Notch ball. A shearing action between the V-notch ball and the ball seal (figure 1) promotes smooth, nonclogging operation.
How much of a turn fully opens or closes ball valves?
90°
A 90° turn of the wrench opens or closes the valve. It is open when the ball’s hole is in line with the fluid flow direction and closed when it is pivoted 90-degrees by the valve handle.
What is segmented ball valve?
A segmented ball valve is similar to a conventional ball valve, but with a contoured V-notch segment in the ball. This control valve has good rangeability, control, and shutoff capability. The V-notch ball provides positive shearing action and produces an inherent equal percentage flow characteristic.
Can ball valves control flow?
Simply put, a ball valve is an on-off valve. It can be used to control flow by its main characteristic, the ball, being open or closed. Furthermore, a ball valve can be partially open to regulate the flow of gas/liquid. An advantage to the ball valve is that it’s relatively easy to tell when it is open or closed.
Why ball valves are normally flanged?
Flanged ball valves are widely used by industries that transport water or other liquids through pipes at low to high pressures and temperatures. Flanged ball valves provide the ability to start and stop the flow of liquids and to change pipes without disrupting the entire line.
What kind of valves do Fisher Vee-Ball V150 use?
The unrestricted straight-through flow design provides high capacity for gas, steam, liquids, and fibrous slurries. V150, V200, and V300 valves mate with a variety of ASME raised face flanges, as well as with EN flanges (see Specifications). To meet specific application requirements, a variety of metal and soft ball seal materials are available.
How big are the Vee-Ball rotary control valves?
FCE offers these valves to be built to meet NACE-MR0175 standards upon request. NPS 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 14, 16, and 20 inch flanged valves that mate with ANSI class 150 raised-face flanges. NPS 1, 1.5, 2, 3, 4, 6, 8, 10 inch flangeless valves that mate with ANSI class 150, 300, or 600 raised-face flanges (depending on size).
When to use F V in valve sizing?
The graph of Reynolds number vs. viscosity correction factor (F v ) is used to determine the correction factor needed. (If the Reynolds number is greater than 3500, the correction will be ten percent or less.) The actual required C v (C
How is C V related to valve size?
C v varies with both size and style of valve, but provides an index for comparing liquid capacities of different valves under a standard set of conditions. To aid in establishing uniform measurement of liquid flow capacity coefficients (C v