Ball Valves

Curtiss-Wright Valves Division offers Ball Valves as part of its offering to the power and oil & petrochemical processing industries, which it has maintained for the past 20 years. Ball valves are available in one-piece, two-piece or three-piece specifications. Size’s vary between ¾” and 16” in carbon steel, stainless steel and other alloys. The pieces are available with flanged and flangeless connections and for spring diaphragm or cylinder actuators.


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Ball Valves: Purpose, Functionality & Application

Ball valves are a type of valve that controls the flow of liquid or gas in a pipeline; it does this via a spherical perforated ball that pivots inside the pipe. There are two main types of operation: manual or automated. Manual ball valves are open when the ball's bore is in line with the flow and closing when it is pivoted 90-degrees by the valve handle. The handle aligns with the flow when open and is perpendicular to it when it is closed, quickly showing a visual confirmation of the valve status. It can also be set at half-turn or quarter-turn positions to reduce or increase fluid flow level and pressure. Automated ball valves are controlled with an electric or pneumatic actuator. Connected directly to the valve stem, the ball valve can be shut off or switched on remotely, unlike a manual version that needs a handle.
 

BENEFITS:

  • Long life expectancy 

  • Maintenance-free

  • Compact design

  • Durable & reliable operation

  • Performs well after many cycles

  • Seals close securely even after long periods of disuse. 

  • Available in different materials: brass, stainless steel, carbon steel and plastic

  • Available in numerous valve housing specifications: one-piece, two-piece and three-piece

  • Available in numerous connections: compression, push-fitting and threaded

Ball valves are primarily useful in fluid shut off and control applications that need to avoid losing pressure, such as oil and gas production facilities. 
 

Types of Ball Valves

While all are carrying the same working function, many different types of ball valves are unique in their characteristics and are best suited to various process applications. 
 

Threaded ball valves

Coming with a wide range of options, threaded ball valves are the most common. They can include up to four ports which can be female or male threaded, even a combination of the two. They also have an extensive operating range when used in high pressure and temperature applications.
 

Hydraulic ball valves

Specially designed for hydraulic and heating systems, these valves are typically made from stainless steel and can operate at high pressure and heating oil resistance. The seats inside the valves consist of polyoxymethylene (POM), which is suitable for high pressure and low-temperature applications.
 

Flanged ball valves

Ports on a flanged ball valve connect toa piping system via flanges, and they offer a high flow rate as they usually have a full-bore design. Dependent on your application, a flanged ball valve is suitable for high pressure. Still, it's advisable to check the flange compression class too, which reveals the most elevated pressure it can hold. They can be designed with two, three or four ports and consist of iron, steel or stainless steel.
 

Vented ball valves

Although similar to the more standard threaded ball valves, a bore in the ball and valve body (vented design) differs by the outlet port venting to the environment in a closed position. When the valve closes, the holes align with the outlet port and releases the pressure. It works well in compressed air applications where depressurization is needed. 
 

Types of Ball Valve Housing

At Curtiss Wright, we offer the three most commonly used designs: one-piece, two-piece and three-piece ball valve housings. The valves operating function is the same, but the main differences are how the valve assembles and the opportunity for maintenance or repair.
 

One-piece ball valve

Typically used low demand applications, one-piece ball valves are cheaper than others. The ball is enclosed via pressing or welding and cannot be opened for cleaning or maintenance either. 
 

Two-piece ball valve

Two-piece ball valves connect via a threaded connection. To disassemble for cleaning, servicing and inspection, the valve has to be removed entirely from the pipeline.
 

Three-piece ball valve

Three-piece ball valves are generally more expensive, and the parts connect with bolts. They have an L-shaped or T-shaped bore and can be serviced without removing the valve