Every ball valve, whether manual or operated, flanged or NPT, brass or stainless steel, serves a different purpose for an industrial piping system. That’s why it is vital to understand their operation and features to select a suitable one from the best valve manufacturer in China.
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A one-piece ball valve features a solid cast body to reduce the risk of leakage. It is inexpensive, and it is impossible to repair it. Similarly, fixing a two-piece ball valve is impossible unless it is removed from service. Such a valve comprises two pieces where one piece has one end connection and the body. The other piece fits into the first one to hold the trim and includes the second-end connection.
Although the differences between these two valves are tricky, their understanding is essential for various processes. So, let’s learn everything about one-piece vs. two-piece ball valves!
A single or a one-piece ball valve features only one body part. In this device, the trim attaches to the seals through end connections made of the same material as the body. Since its port size is not the same as its line, it results in a small bore design. A device bought from an industrial ball valve company comprises a ball, a PTFE ring, and a lock nut.
Users rarely or never experience leakage problems with this type of construction. However, the main downside to this type of device is it is irreparable, i.e., it cannot be replaced. It features a reduced diameter, and its flow diameter is smaller than the thread diameter.
Since it is a relatively new ball valve type, it offers some unique advantages, reducing the size of the actuator. Its working principle is to make the valve unblocked or blocked by rotating it.
In high-demand industries, a one-piece ball valve is rarely employed because they are difficult to repair and replace. However, a one-piece ball valve can be utilized in applications where a reduced flow is not a concern. It works effectively in such applications. Some common uses of this device are in food service machinery, liquid filling equipment, and motor fluid filing equipment.
A two-piece ball valve contains two independent components connecting them through a bolt, thread, or flange assembly. These pieces have body and end connections. However, since two separate sections are combined in this valve body, there is a high chance of leakage. It is used to cut off, distribute, and alter the flow direction of the medium in the pipeline.
As a result, a two-piece ball valve is unsuitable for high-pressure applications. Unlike a one-piece valve, it is possible to disassemble it for internal component repair because of the connection. Its sealing effect is better than a one-piece ball valve and is further divided into a top entry floating ball valve, an elastic, and fixed one.
A two-piece ball valve is commonly used in various applications with any media because of the ease of maintenance in a wide range of industries. A few industries employing a two-piece ball valve in their applications include food, manufacturing, and automotive. Its working principle is to block the valve or unblock it by rotating it.
Here is a quick table to help people understand everything they need to know about one-piece vs. two-piece ball valves:
In industrial piping systems, a ball valve functions as a shut-off device to regulate the flow of media, especially liquids and gases, passing through it. It controls the flow by rotating the ball with a bore located inside it. Industrial valve manufacturers offer their devices in several industries, including chemical storage, oil and gas, residential applications, and manufacturing.
Since it is available in many types, such as one piece, two pieces, and three pieces, choosing the one with a body suitable for a particular application often becomes challenging. While a one-piece ball valve has only one body portion, a two-piece valve has two body components threaded together.
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A one-piece ball valve is typically considered a thrown-away because it is difficult to repair it for maintenance. But it is still an economical option than its counterparts, such as a two-piece valve that feature a main body and a single-end connection. One can quickly repair it, but it is often difficult due to galling in the threads when the end plug removes from the valve body.
Figure 1: One-piece ball valve
A ball valve is a shut-off valve in piping systems, controlling the flow of liquids or gasses. Understanding the differences between 1, 2, and 3-piece ball valves is essential for selecting the right valve for any application. This article examines the design, performance, and specific applications of these ball valve configurations. This article compares 1, 2, and 3-piece ball valves in detail. Read our ball valve overview article for more details on the design and working of ball valves.
In short, the main difference between 1, 2, and 3-piece ball valves is their body design. A one-piece ball valve has only one body portion. Two-piece ball valves have two body components threaded together or bolted together. Three-piece valves, on the other hand, have three independent components.
Building a single-piece ball valve is simple as there is only one body part. The valve trim is attached to the seals through end connections made of the same material as the body. Also, the valve's port size will not be the same as the line size, resulting in a reduced bore design. There is very little or rather no leakage with this type of construction. A one-piece ball valve is irreparable, and it can only be replaced. Figure 1 shows a one-piece ball valve.
One-piece ball valves do not have uses in high-demand industries since they are difficult to repair or replace. In applications where a reduced flow is not a concern, one-piece valves can be employed. Foodservice machinery, liquid filling equipment, and motor fluid filling equipment use one-piece ball valves.
Two-piece valves have two independent components connecting them, either threaded or a bolt and flange assembly. The pieces have body and end connections. As two separate sections are connected, there is the possibility of leaking. As a result, the two-piece ball valve is unsuitable for high-pressure applications. Because of the connection, the valve can be disassembled for internal component repair.
A two-piece ball valve's structure allows it to be used in various applications. The valve can be used with any media because of the ease of maintenance. Food, manufacturing, and automotive industries are just a few of the industries that use two-piece ball valves.
Figure 2: 2-piece ball valve
A three-piece ball valve has one main valve body and two pipe connectors. The pipe connectors are welded or threaded to the pipes. Because of the three-piece structure, the valve body and trims can be removed without interfering with the pipe connections. After installing a 3-piece ball valve, the worn-out components like the ball, seat, or stem can be replaced independently and quickly. It is also more expensive than a two-piece ball valve due to its intricate structure. But, the valve can remain in service for its intended lifespan with low long-term maintenance cost.
The structure of a three-piece ball valve makes it suitable for high-pressure applications where the components experience a lot of wear and tear. The valve is ideal for high-cycle industries since the parts can be replaced and serviced without replacing the entire valve. Primarily, manufacturing industries mainly rely on three-piece ball valves to control liquid flow.
Figure 3: 3-piece ball valve made of stainless steel
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