Ball valves are one of the most widely used types of valves. They are suitable for a wide range of applications, from heavy-duty industrial use to household plumbing. There are two main types of ball valves: floating ball valves and trunnion mounted ball valves. Both types have their own unique features and benefits. But what’s the difference between these two types of valves? Here are the difference between floating ball valves and trunnion mounted ball valves.

What is a Floating Ball Valve?

The ball of the floating ball valve is floating, and the valve seat is fixed. With the effect of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure that the outlet end is sealed.

Forged steel floating ball valve

How Does a Floating Ball Valve Work ?

A floating ball valve comprises 3 main parts:

1.  An actuator lever 2. A stem 3. A floating ball

The actuator lever is the outermost part used to open or shut-off fluid flow. When it is turned within a 90-degree angle, it rotates the stem which turns the ball to an open or closed position.

At the base of the valve, the ball remains unmounted and is only supported by a stationary polymer ring and seats.

When the valve is shut, medium pressure pushes the ball firmly against the seats. This provides a tight seal and stops flow immediately. However, given as the ball is unsupported, high levels of pressure can not be distributed to a base to lessen the force on the ball. A floating ball valve is thus only recommended for low to medium pressure applications with average temperatures. Where necessary, it can also be customized to work in cryogenic applications.

Regarding overflow management and controlling leakages, a quality floating ball valve should have designs with anti-static and anti-blow out stem. This means that when pressure is elevated or during fluid surges, the stem will keep with no leakages. A flexible soft seat is equally essential as it creates sealing around the floating ball to stop media flow.

Pros & Cons of a Floating Ball Valve

Pros:

1. A floating ball provides impenetrable sealing when pushed onto its seats. 2. It responds fast to shutting off or allowing fluid flow. 3. It is very efficient in small scale applications for which other valves would be unsuitable due to size.

Cons:

1. It is limited to small designs to manage torque levels. 2. It operates at high torque. 3. The high pressure experienced by seats and seals during shut off can increase their rate of wear and tear.

What is a Trunnion Mounted Ball Valve?

A trunnion Mounted Ball Valve is a quarter-turn valve. It has a ball supported by both the stem and trunnion, giving it greater strength and a reduced operating torque.

Trunnion Mounted Ball Valve

How Does a Trunnion Mounted Ball Valve Work ?

A trunnion mounted ball valve consist of 4 main parts:
1. An actuator lever
2. A stem
3. A ball
4. A trunnion

The trunnion forms the base onto which the ball is mounted. At the top end, the ball is linked to the stem. And the stem is connected to an exterior actuator lever. In a flanged trunnion ball valve, there are spring-loaded seats and a polymer ring insert between the trunnion and the ball. The springs put pressure on the ball to keep it in place. Together with the polymer ring, they also reduce friction when the ball is rotating.
To facilitate the flow of media, the ball is made hollow in the middle. It can either be a full bore or a partial bore. A full bore is a ball whose hollow part is the same size as the pipeline it is installed in.
When the actuator is turned, the stem connected to it also turns. These actions cause the ball to rotate on the trunnion to an open or closed position. During and after fluid flow, seals in the seats and stem prevent the fluid from leaking out of the pipeline. An adjustable gland packing box also helps the valve take on different capacities of pressure. A typical trunnion ball valve would also have 2 bleeders for purposes of depressurization.

Pros and Cons of a Trunnion Mounted Ball Valve

Pros:
It requires less torque to operate.
It can be applied in both large or small scale operations.
Less friction during trunnion ball valve operation helps mitigate wear and provides full-proof sealing.

Cons:
Due to the fully-welded or bolted-together design, trunnion ball valve is difficult to be repaired in-line. Therefore, repair will interrupt normal pipeline operations.
If maintenance is not carried out as required, welded parts could begin to operate with higher friction leads to efficiency decline.

Floating Ball Valvesvs. Trunnion Mounted Ball Valves

The Floating Ball Valve                                     The Trunnion Mounted Ball Valve

 

The Floating Ball Valve	The Trunnion Ball Valve
The valve seats are fixed in the valve body	The ball is fixed in position by trunnions (bearing) and can only rotate
In the closed position, the ball can move a little bit in flow direction	The seats can move a little bit in flow direction
The ball is pressed against the downstream seat	The upstream seat is pressed against the ball
The system pressure acts on the whole circular area of the ball	The system pressure acts on the circular ring of the upstream seat
Usually DN 25 (NPS 1) up to DN 200 (NPS 8) for 150LB~600LB Usually DN25 (NPS 1) up to DN 50 (NPS 2) for 900LB~2500LB	Suitable for All sizes and All Pressure Class
Suitable for medium and low-pressure applications as they are smaller in diameter and capable of bi-directional shutoff	Suitable for high-pressure applications and those that require bigger dimensions

Considering your application against their features would help you identify which of them would best meet the needs of your project. Floating ball valves are suitale for low- to- medium pressure scenarios, and trunnion mounted ball are better for high- pressure projects. And the latter work in most cases.

See more: www.clvvalve.com

Globe Valves

 

What are Globe Valves?

Globe valves, a type of control valve, are used to stop, start and regulate the flow of media through a pipe. From the outside, they have a spherical body design. And inside, a plug-like disc sits on the end of a threaded rotating stem to raises and lowers to control media flow. Globe valves are part of the linear motion valve family, which means that the valve mechanism moves along a straight line.

How Does a Globe Valve Work?

Named for their spherical body shape, globe valves bodies are separated into two halves by an internal baffle. The seat on the globe valve disc can be screwed in to close the valve. Most automated glove valves use smoother stems not threaded ones. And use an actuator assembly to open and close.

Gate Valves

What are Gate Valves?

Gate valves are linear motion valves that are used only to start or stop media flowing through a pipe. They are shutoff valves instead of control valves, since they are not ideal for throttling.

Generally, they are designed with a flat or wedge-shaped disc on the end of a threaded stem, which is turned via a wheel and raises and lowers to operate the valve. Gate valves provide a tight shutoff, and  are commonly used for isolating media. Because they do not force media to change course (as in a globe valve) , gate valves cause little pressure drop.

Gate and globe valves often work in tandem inside a piping system. Gate valves can be designed with rising or non-rising stems, which is helpful for space optimization.

 

How Does a Gate Valve Work?

When a gate valve is activated, the stem will turn clockwise or counter clockwise to raise or lower the disc inside the pipe. In its closed position, the disc lodges between the seats in the base of the valve, providing a full stop at a right angle to the media flow. The disc can be shaped like a wedge, knife or parallel panel.

 

Ball Valves

What are Ball Valves?

Unlike gate or globe valves, ball valves are a type of quarter-turn valve that utilizes a bead shaped ball with a hole in the middle to control the flow of media. Called a bore or port, the hole in the middle of the ball allows media to pass through the valve body when opened, and is rotated 90 degrees to stop flow. The port is aligned perpendicular to the valve body in the closed position.

 

How Does a Ball Valve Work?

Ball valves are a type of quarter-turn valve which use a hollow, perforated and pivoting ball to control the flow. It opens when the hole of the ball is in line with the flow and closes once pivoted 90-degrees by the valves handle. The handle lies flat in alignment with the flow whilst open and perpendicular once closed. This allows for easy visual confirmation of the ball valves status.

Pros&Cons

 

	Pros	Cons
Globe Valves	Can regulate media flow. Can handle high-pressure, high-temperature, corrosive or viscous media	Create a high-pressure drop Introduce resistance to media flow
Gate Valves	Economical option for on/off control Multidirectional	Offer little resistance to media flow Not ideal for regulating media flow The sustained flow of media in a partially open position Can cause water hammer Prone to leaks: less durable than ball valves
Ball Valves	Long lasting and durable Versatile media compatibility Compact Provide fast cycle speeds Good for high-pressure, high-volume applications Offer little resistance to media flow	Not ideal for regulating flow Fast cycle time can lead to water hammer

 

As a producer of high-quality valves, ZJCLV can meet various customized requirements of customers. We can produce ball valves from 1/2 inch ball valves to larger ones.

See more: www.clvvalve.com

The Ball valve is one of quarter-turn valves. Various designs of ball valves could meet different requirements. In this article, we would like to introduce the difference between full bore ball valves and reduced bore ball valves.

Full Bore Ball Valves

Full bore ball valves (full port ball valves) open completely, which create an unobstructed path for gases or liquid being pumped through a tube or pipe. The width of the flow channel in a full bore ball valve is equal all through from the inlet to the outlet.

API 6D and API 608 are some of the full bore sizes that are published by the same organization. There are some very slight differences regarding their bore size requirements.Full bore ball valves range from pressure classes that are limited between 150 to 600, and this includes valve dimensions like API 608 and API 6D. The biggest ones can reach all the way to 2500.The minimum bore size for a full bore ball valve should be API 6D.

Reduced Bore Ball Valves

A reduced bore ball valve is a type of ball valve with ball bore diameter less than the pipe diameter. The internal parts of the reduced bore ball valve are wider for the flow compared to the path diameter, while the actual diameter of the actual flow path is approximately one specification smaller than the conventional parameters. Most reduced bore holes start from API 6D all the way up to API 608, with some being described as double reduced bore valves.

Comparison

1. Installation

Install a reduced bore ball valve is much easier with a smaller volume as it has fewer requirements. And it is much lighter  compared with the full bore valve.

Full bore ball valve is 30% heavier and generally has a bigger volume than reduced bore ball valve. This makes the reduced ball valve more ideal for reducing the load in the pipelines as well as bringing down the cost of transportation.

2. Cost

The cost of a reduced bore ball valveis lower than full bore ball valve, and this comes down to performance and size. The full bore can handle bigger tasks under the circumstance of without collapsing. On the other hand, reduced bore valves are smaller. And although they are also made using quality materials, they cannot handle the same level of work that full bore valves do.

3. Nature of Work

Full bore valves are able to handle highly viscous media. It would have problems being transported from one point to another that were handled by other types of valves. This is the kind of valve that you will never miss in an oil refinery plant. Reduced bore valves, on the other hand, are designed for handling lighter mediums like paraffin which can move quickly even when there’s some resistance in the system.

4. Size

Full bore valves are way bigger than reduced bore valves known from the size, the volume, and the weight. Full bore valves go into slightly wider tubes and pipes, while reduced bore valves go into smaller ones.

ZJCLV is a company that provides high-quality valves. Here is Zhejiang Chuanglian Valve Co. , Ltd. Are you looking for the best ball valve? COME & WATCH our produts.

See more: www.clvvalve.com

A ball valve is a valve with a ball as the closing part. The main function of the ball valve is to cut off and connect the fluid in the pipe. And it is mainly used for oil and gas storage and transportation. And it is used for controlling medium in chemical industry, metallurgy, papermaking, food industry, shipbuilding and other industries.

Installation

1. Complete all welding works before valve installation. In the meanwhile, be sure the flange has cooled to ambient  temperature before installing the ball valve.

2. During assembly, metal debris, fiber, grease, dust, other impurities, and other pollution are not allowed to stay on the surface of parts or enter into the inner cavity.

3. During disassembly and reassembly, it is necessary to protect the sealing parts, especially the non-metallic parts.

4. When reassembling the ball valve body, the bolts must be tightened symmetrically, step by step.

Maintenance

1. Before assembly, clean the new parts.

2. Clean the disassembled single parts  by immersion.

3. Using compatible cleaning agent and lubricating grease with the parts of valves. If the  medium is gas, gasoline (gb484-89) can be used to clean metal parts and clean non-metallic parts with pure water or alcohol. What’s more, apply a thin layer of grease on the surface of the seal installation groove, the rubber seal, and the valve rod.

4. Do not soak the non metallic parts  for a long time.

5. After cleaning, it is necessary to wait for the wall cleaning agent to volatilize (wipe it with silk cloth not soaked with cleaning agent). But do not put it aside for too long in case  it will rust and be polluted by dust.

Installation Inspection

 

1. Once the installation is complete, operate the valve several times to ensure it is free from impingement and rotating through its full 90 degree operation.

2. According to the design requirements of pipeline pressure, check the sealing performance of the joint surface between ball valve and pipeline flange after pressure is applied.

 

Here is Zhejiang Chuanglian Valve Co. , Ltd.  We sell many kinds of valves, not only to supply you high quality product, but also the excellent after sales service.  See more information: http://www.clvvalve.com

 

About Ball Valves

 

Ball valves are applied to cut off, distribute and change the flow direction of medium in the pipeline. Rotating 90 degrees and a small rotating torque can close tightly them. Recently, developments have designed ball valves to throttle and control flow, such as v ball valves.

Generally, the life expectancy of a ball valve is 8-10 years. And usually the longer its life is, the lower the cost.

Ball Valve Life

Any ball valve will have wear as it in the process of use. In most cases, rotation consists of a 1/4 turn of a horizontally mounted shaft. The ball valve will lose its function due to wear and tear and its original function after being corroded.

Methods of Extending the Life of a Ball Valve

1.Media

Ball valves provide on or off control for gases and liquids. Try to avoid abrasive media or media containing suspended particles so as to reduce ball valve wear. For  it often causes valve seal failure and leakage. Therefore, we should pay attention to the selection of medium to prolong the life of the ball valve.

2.Material

The type of liquid or gas determines the material of the ball valve. The materials of valves should be compatible with the temperature, pressure rating and chemical composition of the medium flowing. Different materials are suitable for different working environments.

3.Temperature and Pressure Ratings

The valve media pressure and temperature influence the type of valve materials you use. As the media temperature increases, the pressure decreases, and vice versa. These factors combined with cycle frequency affect the longevity of the ball valve.

5.Actuator

Ball valves can be manually operated or actuated. Manual ball valves require the operator to turn a lever or handle on top of the valve. Because the operator must control the valve, these are not the right choice for high cycle applications or valves located in hard-to-reach places. In most applications, actuators will last longer than ball valves.

Here is Zhejiang Chuanglian Valve Co. , Ltd. We have all kinds of ball valves, like two way ball valve , three way ball valve, manual ball valve, industrial ball valve and so on. What ChuangLian Valve offer are the best ball valves, waiting for you to get it.

For more information, please find our website: www.clvvalve.com

 

 

Valves are used to control the flow of gases, liquids and particulate solids. They come in many types, sizes, materials, pressures, temperature classes, and drive modes. Gate valve and ball valve are two distinct members of the valve family, which are generally used for two different types of flow control.

About Gate Valves

 

The gate valve has a flat closing element that slides in the medium flow to open or close the valve. In the bronze valve body often used in commercial and residence applications, the bronze disc moves up and down to open and close the valve. The valve is designed to keep the brass stem at the same height relative to the movement of the disc. A Teflon packing is used in the threaded cap to prevent leakage around the valve stem. The manual valve is driven by turning the cast iron hand wheel (a ball valve butterfly handle or a ball valve blue handle).

About Ball Valves

The ball valve has a spherical closing element, round or other shaped hole. Align the hole with the flow, open the valve, and close the solid flow outside the ball. The ball is located on the valve seat, and the valve rod is inserted into the top of the ball. The packing and gasket anti port gate valve around the valve stem has two ports, one inlet and one outlet. The above gate valves have threaded ends, and welding and flange connections are available.

Advantages of Ball Valves

1.The thrust bearing reduces the friction torque of the valve rod, which can make the long-term operation of the valve rod stable and flexible. 2.Anti static function: a spring is set between the ball, valve rod and valve body, which can export the static electricity generated during the switching process. 3.The fluid resistance is small, and the pneumatic ball valve is the one with the smallest fluid resistance among all valve classifications. Even the reduced diameter pneumatic ball valve has a relatively small fluid resistance. 4.The valve rod seal is reliable. Because the valve rod only rotates without lifting, the packing seal of the valve rod is not easy to be damaged, and the sealing capacity increases with the increase of medium pressure. 5.Because the main valve seat sealing ring material of the ball valve is Teflon, which is inert to almost all chemicals, and has the comprehensive characteristics of small friction coefficient, stable performance, not easy to aging, wide temperature application range and excellent sealing performance.

Advantages of Gate Valves

1.The flow resistance is small, the medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small. 2.Compared with the stop valve, it is labor-saving when opening and closing, because whether it is open or closed, the movement direction of the ram is perpendicular to the medium flow direction. 3.The height is large, the opening and closing time is long, the opening and closing stroke of the ram is large, and the lifting and lowering is carried out through the screw. 4.Water hammer is not easy to occur because of the long closing time. 5.The medium can flow in any direction on both sides, which is easy to install. Both sides of the gate valve channel are symmetrical.

 

Ball Valve Details

 

There is no good or bad between ball valve and gate valve. Please buy the right valve according to your own needs.

The article is from ChuangLian Valve Co., Ltd. For more information, please find our website www.clvvalve.com

No matter how good the quality of a valve is, it still has the service life. But how the ball valves can be disassembled? Today, let’s help you solve the ball valve problem.

For Safety, the Following Matters are Required to Do Before Disassembly:

① When removing the valve, the hand cannot contact the valve inner cavity. The remotely operated valve will close at any time to harm the operator.

② Shall be aware of the media in the pipeline and if in doubt, verify with the relevant concerned.

③ Contact media shall wear protective clothing or corresponding equipment in accordance with conventional requirements.

④ When the valve and pipe are pressure relief, open the valve before it is removed from the pipe, and empty the pressure that may remain in the valve, leaving the valve in the open position. After removing the valve and before decomposition, place the valve vertically, open and close the valve repeatedly, and discharge the residual medium.

⑤ Seal seat and body rating – the safe and correct use of this type of valve mainly depends on the rating of the seal seat and body. Know the rating on the nameplate. This type of valve has many seal seat materials to choose from, and the rating of some seal seat materials is less than the valve body rating. The overall rating of the valve body and seal seat also depends on the type, specification, seal seat material, bolt material and stability of the valve. The working conditions of the valve cannot exceed these ratings.

Disassembly Process:

① Position the ball valve right body flange down to the work table and turn the stem to keep the ball valve closed.

② Unscrew and connect the flange nut and remove the left valve body.

③ Remove the sphere from the right body chamber (do not touch it).

④ Remove the seal seat from the left and right valve body.

⑤ Remove the stem retaining rim and the ball valve wrench.

⑥ Unscrew down cover and two bolts, remove the positioning block and cover.

⑦ Remove the stem from the right body chamber.

⑧ Removes 4 fillers from the mouth (1 top, 2 middle and 1 lower).

⑨ Remove the gasket from the right valve body.

⑩ Remove the thrust gasket from the stem and remove the upper bushing from the pressure cover.

Check all parts for damage or corrosion, and  replace sealing gasket and damaged, worn or corroded parts, and then repair damaged parts.

 

 

Our Zhejiang ChuangLian Valve Co., Ltd as one of the ball valve manufacturers,we have rich experience to make ball valves, try to produce the best ball valves. For more information, please find our website www.clvvalve.com.

As we all know, chemical products are generally corrosive, flammable, explosive and other characteristics, which put forward higher requirements for the selection of valves. And the choice of the valve is very important in the chemical pipe design, which to a certain extent, determines the quality of pipeline design work, so on the concrete when the choice must be to the characteristics of the valve in common understanding, on the basis of careful to choose. From previous passage we’ve known the characteristics of three valves. In this paper, We continue to learn the characteristics of butterfly valve, plug valve and ball valve.

1. Butterfly Valves

A butterfly valve is often used in the design of chemical pipeline. It is characterized by small volume and light weight, and its structure is also very simple. These characteristics bring great convenience to the application process. In the process of practical application, workers tend to use it more in some work with large flow. In the process of practical work, it also shows some advantages and has been widely used accordingly. But at the same time, we can also find that in the process of using the butterfly valve, the temperature is often not too high, because it is sensitive to temperature, once the temperature is higher, it will affect its normal working process, make it poor sealing.

2. Plug Valves

In the chemical pipeline design work, compared to other types of manufacturing costs, this valve is relatively high. At the same time, it also has many advantages. First, the plug valve in the working process of sealing is very good; Secondly, it is very convenient to close the valve after opening; And the use of the valve cycle is very long. Finally, the valve in use process can better realize the bidirectional closed. It also makes the superiority characteristic of its application range is wide, and on some polluting the stronger material transport can also achieve good sealing work has strong value and function. But it cost expensive sex is affected to some extent it spread more widely and use.

3. Ball Valves

A ball valve is a valve type very similar to a plug valve. According to its body structure, ball valves can be divided into three types: one-piece ball valve, two-piece ball valve and three-piece ball valve. Ball valves to a certain extent followed the advantages of plug valves, can be better for some temperature being not high, strong pressure and strong viscosity of the material to transport. But its cost is much lower than the plug valve, maintenance is also more convenient than other valves. Therefore, it has been more widely used. It is worth noting that if some requirements for flow control aspects of the work, the use of ball valves is not very convenient, because it is not a good flow to regulate and control.