According to the structure:

1. Floating ball valve

The ball of the ball valve is floating. Under the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end. The structure of floating ball valve is simple and its sealing performance is good, but the load of working medium bore by the ball is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.

2. Trunnion mounted ball valve

The ball of the ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating seats. Under the pressure of medium, the seats move to make the sealing ring tightly press on the ball to ensure the sealing. Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque, suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of ball valve and increase the availability of sealing, oil-sealed ball valve has appeared in recent years. Special lubricating oil is injected between sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. It is more suitable for high-pressure and large caliber ball valve.

According to the pressure:

High pressure ball valve, medium pressure ball valve and low pressure ball valve;

According to the type of flow channel:

Full bore ball valve, Reduced bore ball valve;

According to the channel position:

Straight through type ball valve, three way type ball valve, right angle type ball valve;

According to the temperature:

High temperature ball valve, normal temperature ball valve, low temperature ball valve, ultra-low temperature ball valve;

According to the sealing form:

Soft sealing ball valve and hard sealing ball valve;

According to valve rod:

Top Entry ball valve and side entry ball valve;

According to the connection form:

Flange ball valve, welded ball valve, threaded ball valve, clamp ball valve;

According to the driving mode:

Manual ball valve, automatic control ball valve (pneumatic ball valve, electric ball valve, hydraulic ball valve);

According to the size:

large size ball valve, medium size ball valve and small size ball valve.

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The post Classification of Ball Valves appeared first on ZECO Valve.

There are many kinds of ball valves, which can be combined into various products with different functions through different structure, connection, pressure level, driving form, etc. However, from the most basic point of view, there are two kinds of differences between full bore ball valve and reduced bore ball valve. Generally speaking, when the inner diameter of the valve ball is less than or equal to 85% of the inner diameter of the ball valve port, it is called reduced bore ball valve, and when the inner diameter of the ball valve is greater than 95% of the inner diameter of the ball valve port, it is called full bore ball valve. So what are the differences between the two in selection or application?

What is a Full Bore Ball Valve?

A full bore ball valves have an oversized ball so that the hole in the ball is the same size as the pipe internal diameter which ensures straight-through flow and positive shut off with minimal pressure drop and very little resistance to the flow of liquid.

What is a Reduced Bore Ball Valve?

A reduced bore ball valve is a type of ball valve with ball bore diameter less than the pipe diameter. In a reduced bore ball valve, the area of fluid flow is narrower downstream at the outlet.

What is the Difference Between Full Bore Ball Valves and Reduced Bore Ball Valves?

• 1、 Definition:
  • 1). The full bore ball valve is an equal width flow channel, that is to say, the size of the flow channel from the inlet to the outlet is the same, and its size cannot be less than the value specified in the standard, which is roughly equivalent to the nominal diameter of the specification. For example, the flow channel diameter of DN50 full bore ball valve should be about 50;
  • 2). The inlet of the reducing ball valve flow path is wider than the flow path diameter, and the actual flow path diameter is about one specification smaller than this specification. For example, the flow path of DN50 reducing ball valve is about 38, which is about the same as that of Dn40. Shrink one specification within DN250 and two specifications within 250-600, and the above 600 shall be determined according to the actual situation.
• 2、 Applicable media:
  • 1). The full bore ball valve is generally used for conveying viscous and slagging prone medium pipelines. Because of its small fluid resistance, it can be said that there is basically no flow resistance, and it is convenient for the regular paraffin scraper and blower to pass through.
  • 2). The reducing ball valve is suitable for conveying gas or medium with physical properties similar to water, because its weight is about 30% lighter than the full diameter ball valve, and its flow resistance is only about 1 / 7 of the same diameter globe valve. It is beneficial to reduce pipeline load and cost.
• 3、 Applicable process:
  • 1). For the pipeline requiring regular pigging, full bore ball valve must be used no matter what medium is transported. When the medium passes through the full bore ball valve, it will not reduce the flow, and the flow resistance is small, which is an ideal product for pipeline control, especially for the strict working condition. In particular, when the main pipelines in oil and gas pipelines need to be buried underground, full bore welded ball valves must be used.
  • 2). The reducing ball valve is suitable for some working conditions with low requirements and small requirements for convection resistance. When the inner diameter of the valve is more than 80% of the inner diameter of the pipe end, there is little effect on the flow capacity of the pipe. Many valves have reducing diameter, which is generally controlled within 0.8. On the one hand, reducing diameter reduces the flow capacity of the valve, that is, the Kv value of the valve, increases the pressure drop at both ends of the valve, resulting in energy loss. For the pipeline, it has no great impact, or increases the flushing of the pipeline.
• 4、 Comparison of advantages and disadvantages:
  • 1). Installation space: the volume of the reducing ball valve is small, so the requirement of its installation space is smaller. Because its weight is about 30% lighter than the full bore ball valve, it is beneficial to reduce the pipeline load, transportation load and cost.
  • 2). Cost: the price of reducing ball valve is one grade lower than that of full bore ball valve. Considering the cost performance, it is generally defaulted internationally, and the same ball diameter valve body is adopted for the adjacent pipe diameter. For example, DN32 and Dn40, DN50 and DN63, dn90 and dn110, dn160 and DN200, DN250 and dn315 use the same sphere.

How to Choose?

Understanding the situation of your project like the medium type, pressure, and so on.

If pressure is a factor that you are very concerned about, then you need to know that the reduced bore ball valve will cause pressure drops. And the full bore ball valve won’t.

If your pipeline needs to be cleaned regularly, the full bore ball valve will be your best choice.

We are welcome any inquires from contractors, designers, and distributors. We are glad to help you to select the right valve and quote the better price for your reference.

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The post Full Bore Ball Valves vs Reduced Bore Ball Valves appeared first on ZECO Valve.