Advantages of V-Ball Valves

Introduction

Ball valves are designed to be used in a variety of applications and markets, but a V-port ball valve offers the added ability to be used as a control valve where necessary. The main differentiator is a contoured V-port in the ball, most commonly available with a 15°, 30°, 45°, 60°, or 90° angle, which produces an equal percentage flow characteristic for better control. V-ball valves are known to offer a variety of advantages in flow control applications, especially when compared to larger and more expensive control valves.

Low Pressure Drop

The V-port design allows material to flow straight through the valve, minimizing pressure drop across the valve. V-ball valves also have higher flow coefficients (Cv) compared to other control valve types of a similar size; this means that a smaller V-ball valve can be used to achieve the same flow rates as a comparable control valve of a larger size.

Bubble Tight Shut-Off

V-port ball valves use the “floating ball principle, which will provide a bubble tight shut-off in addition to the modulating flow control. When the valve is closed, upstream pressure pushes the ball against the downstream seat, thus enhancing the seal. These can control or shut off bi-directional flow, which proves to be especially beneficial in gas applications. Comparable control valves often require additional shut-off valves; V-ball valves eliminate the need for these additional valves, saving the user cost and reducing the number of overall components in the system.

Precise Flow Control

Precision machined V-ball valves are available with 60° and 90° V openings and offer equal percentage flow characteristics. As the ball rotates, desired flow rates can be achieved by positioning the ball anywhere between 0° and 90°. Response time is also increased due to the ability to use smaller actuators with these valves.

High Shut-Off Pressure

V-ball valves feature a quarter turn (90°) ball rotation, allowing them to operate and shut off at much higher working pressures. Because of this, smaller lower torque actuators can be used, which results in cost savings and higher efficiency in the user’s application.

Conclusion

W.E. Anderson’s V-port ball valves have been designed to offer maximum flow characteristics that are substantially higher than similarly sized control valves, as well as offering a smaller size, lighter weight, and lower cost. The NPT Stainless Steel V-Ball Valve, Series WE06, and Flanged Stainless Steel V-Ball Valve, Series WE07, offer the market highly accurate flow control in a compact ball valve package.

Common Valves Used in the Oil & Gas Industry

Valves are a vital part of any piping system, which means that they play a key role in the oil and gas industry. They can be used to control flow rates, to isolate and protect equipment, and guide and direct the refining process of crude oil. In this post, we will discuss five common valves that are used in the industry and what Dwyer Instruments, Inc. has to offer. Continue reading “Common Valves Used in the Oil & Gas Industry”

Control Valve Sizing

Hi-Flow™ Valve Application

Control valves are used to change process conditions such as flow, temperature, level, and pH. A complete control system would include a sensor, controller, positioner or current to pressure transducer, and control valve. Globe valves, such as the Dwyer Hi-Flow™ Series, are a common type of control valve. In the example shown, a Hi-Flow™ control valve is controlling temperature by varying the amount of steam or cold water added to the process. Continue reading “Control Valve Sizing”

What is a Hydronic System and What is Needed to Balance it?

A hydronic system is a system designed to circulate chilled or hot water with the connections between piping and terminal units (heating and/or cooling devices). Most hydronic systems are closed and are usually made in a series loop. In addition to pipes and terminals, valves are placed in this series as a port to balance the differential pressure in the system. The balance of this type of system is often referred to as hydronic or hydraulic balancing. Continue reading “What is a Hydronic System and What is Needed to Balance it?”

Control Valve Trim Styles and Flow Characteristics

Hi-Flow™ Valve Cutaway

Hi-Flow™ Control Valves vary the flow in a system by throttling the valve plug in and out of the valve seat. The corresponding flow rate through the valve is based on the valve plug and seat type, which is part of the valve trim. Dwyer Instruments, Inc. offers several flow characteristics, needle plugs, and restricted trim options for the Hi-Flow™ Control Valve series.

There are two types of inherent flow characteristic trim styles available in the Hi-Flow™ product line: Linear and Equal percentage. Continue reading “Control Valve Trim Styles and Flow Characteristics”