This allows for additional control because from the tapered opening from aoaltwar's blog

A V port ball valve has a 'v' shaped ball or possibly a 'v' shaped seat. This allows for linear as well as equal percentage flow characteristics. When the valve influences closed position and opening is commenced your little friend end from the 'v' is opened first allowing stable flow control within this stage view this site . This type of design takes a generally better construction caused by higher velocities with the fluids, that might damage a typical valve. When machined correctly these are typically excellent control valves, offering superior leakage performance.

Many industries encounter downside to residues within the ball valve. Where the fluid was created for human consumption, residues can also be health hazard, then when where the fluid changes every now and then contamination of a single fluid with another may occur. Residues arise because from the half open position on the ball valve a gap is made between the ball bore and the body through which fluid might be trapped. To avoid the fluid entering into this cavity, the cavity really needs to be plugged, which is usually done by extending the seats in that manner that it must be always in connection with the ball. This type of ball valve is recognized as Cavity Filler Ball Valve.

When you would like precise control of your application, a globe valve is often more accurate than the usual ball valve. Globe valves are the industry standard for control valves because they're good at regulating flow, whereas ball valves are better for on/off control without pressure drop.

V-Port Ball ValveIf you need to use a ball valve to regulate your process, you might like to consider different kinds of ball valves depending on the application for more . A trunnion or v-port ball valve will do better and let for more accurate adjustability in most scenarios.

Trunnion ball valves come with an additional mechanical anchoring with the ball towards the top and bottom. They make use of a splined or keyed stem connection that eliminates any play relating to the ball and stem. V-port ball valves employ a ‘V’ shaped ball instead on the standard round hole. This allows to get more control because from the tapered opening, allowing for additional linear flow.

In-Line Repair. You can repair 3-piece valves without complete removal through the line, unlike 1- and 2-piece ball valves. Simply remove three from the four cap screws on either side, and the body swings out for replacement in the seats and seals.
Protected Seat. The Tri-Pro Series valves also sport a protected seat and encapsulated body seal design. This isolates and protects the seats and seals in the flow path, preventing cold flow and allowing long-term performance in demanding applications.