What are the advantages and disadvantages of the plug valve ...

Release time：2022-11-29

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The advantage of plug valve applications is that the body mounted on the top of the whole is equivalent to the ball valve mounted on the top of the whole. It is a completely different type and application than two - or three-chip ball valves.

Let's take a look at the advantages and disadvantages of the plug valve and the main uses of the plug valve:

1, the valve body adopts the integrated top installation design, simple structure, convenient online maintenance, no leakage of the valve body, pipeline system strength is high.

2. The corrosive medium in the chemical process is very strong. In chemical environments, the valve body is often corroded by medium. Therefore, the valve body used in the chemical process must have strong impermeability. In addition, the valve body of the plug valve is resistant to intergranular corrosion and is a G-rated casting. Casting quality is 2 grade, precision is 5 grade

3, the opening and closing part of the cock is completely covered by the bushing, the valve body and the cock are not worn, the bushing and the top seal replacement is convenient and economical. You can complete up to 300 valve maintenance and updates. Compared with metal-sealed ball valves in this range, °C has a significant competitive advantage in long-term use.

4, the whole machining surface of the plug valve is only the top surface and the flange, the other parts are one-time casting. No handling in valve body. Compared with ball valve, it has the advantages of small processing capacity.

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5, the plug valve can be designed to perform specific functions according to user needs. Plug valves are the ideal choice for custom - made valve products. The plug valve allows you to easily customize the process. It can meet the requirements of three, four, five, six, double or multi-valve groups and various sheathing. For example, the six-way distribution valves used in the polyester industry are customized plug valves according to the patentee's requirements, which increases the difficulty of ball valves as custom valves.

6, the current plug valve without clearance or end seal. Ball valves are designed with or without clearance, but only ball valves are designed so that the clearance between ball and body is between 1 and 3 mm. The benefits of coating surface sealing applications cannot be realized. Due to this characteristic, the plug valve is easy to crystallize and sticky, suitable for handling many harsh media such as fluid corrosion and sediments containing catalytic particles.

7, coating bushing has surface sealing performance, can be strictly controlled & "zero leakage &"; API598 Soft seal seat test requirements meet TA-Luft or iso15848 stem seal requirements. The general characteristics of the plug valve are long service life and high reliability. Suitable for a variety of corrosive, abrasive, toxic, continuous operation and other media and equipment, has application advantages in the chemical industry. A wide range of applications.

Disadvantages of the plug valve

1. The surface seal design increases the requirement of driving torque. For pneumatic actuators, the use of actuators and accessories larger than the ball valve will increase the cost of the user's. For example, in the PP process, the main globe valve uses a plug valve instead of a ball valve, and the high-frequency on-off valve uses a ball valve, so the pneumatic plug valve is basically used in the main cut-off position. I can. The use of plug valves during adjustment is not fully recommended. The high frequency switch is not an advantage of the plug valve. High reliability stop valve.

2. In some applications, due to improper selection of bushing material or improper design of the valve body, will lead to PTFE bushing expansion, so that the bushing deformation of the release zone valve required to drive torque changes several times. In order to use appropriate materials, strong pertinence, basically avoid this situation.

3. The one-time investment of the plug valve is higher than the ball valve. However, as the reliability and life-cycle cost of plug valves become accepted by domestic users, more and more users will need to continue with the original process design of plug valves, and the decision to switch to ball valves will gradually decrease.

Advantages vs. Disadvantages of Plug Valve

In the chemical and petrochemical industry, plug valve and ball valve are not interchangeable to each other. In terms of market demand, the rate of average use demand of them is about 8 : 1, meaning, every time 8 ball valve are used, 1 plug valves will be used. If there is a higher reliability or alloy materials and better cost performance, people can use plug valve to replace ball valve, but ball valve can’t replace plug valve in the occasion where only plug valve can be applicable to. 

The plug valve mainly has the following advantages: 
1. one-piece valve body, top loading design, simple structure, convenient maintenance, no leakage, supportting higher-strength pipe system. 

2. The medium in chemical process has a strong corrosion resistance. In the chemical field, corroded valve body often can be seen. Therefore, the valve in the application of chemical process must have strong permeability and resistance to intergranular corrosion. The body of  plug valve should be high-level casting, with casting quality of class II and precision of grade V. 

3. Really simple internals. The plug is completely covered by bushing. Body and plug has no wear. Replacing simple and economic bushing or top sealing device can complete the maintenance and update of the valve. Plug valve can reach long-term use requirement of 300 ℃, which has considerable competitive edge compared with ball valve that belongs to this application. 

4. Top surface and flange are all the processing surface of plug valve. Other parts are all one-time casting molding. The inside of valve body has no processing. Comparing with ball valve, it has the advantages of lower machining allowance. Especially, when the material is INCONEL, MONEL, HARTZ alloy, plug valve has the distinct advantage of price.

5. According to the user's demand, various designs of plug valve can achieve a specific function. Plug valves is the best one of customized products. Plug valve is easy to cater to custom design, can be made into three-way, four-way, five-way and six-way valve; double valve group or valves group; all kinds of jacket requirements, etc.. For example, the six-way distribution valve used in polyester industry is designed according to the requirements of patent owners, while the ball valve is difficult to made in line with custom design. 

6. Now, no clearance and face sealing are still the unique features of the plug valve. Although it has the design of the clearance like ball valve’s, the clearance just can be reduced to 1 ~ 3 mm at the most, which can't achieve the application advantages of coated surface sealing. This characteristic of plug valves enable it to deal with a lot of harsh medium, such as easy crystal and viscous fluid or those medium containing catalyst particles and deposit. 

7. Coated bushing provides the characteristics of face sealing. It can be strictly controlled in accordance with the test requirements of zero leakage of API 598 soft sealing valve seat, achieving or sealing requirements of stem of TA Luft or ISO 15848. 

Comprehensive characteristics of plug valve are long service life, high reliability. It is a good choice for a lot of corrosive, abrasive and toxic fluid as well as continuously operated device. It has the application advantages and extensive applicability in the field of chemical industry. 

Disadvantages are as follows: 
1. The design of face sealing improves the requirements for driving torque. In the case of needing be equipped with pneumatic actuators, compared with ball valve, it will cost much more. Such as PP process, main shut-off valve of it is the plug valve, rather than the ball valve, but the high frequency switching valve is ball valve. Therefore, basically, the pneumatic plug valves are applied to the key cut-off position. Plug valve is not recommended to apply it to the occasion of adjustment, since the high frequency switching is not the advantage of it. It is the cut-off valve of high reliability. 

2. In some applications, the incorrect choice of bushing material or improper design of the release area of bushing deformation may cause swelling for PTFE bushing materials, leading to the change of driving torque for several times.

3. Though the investment of plug valve is more than ball valve, as its advantages of reliability and the total cost of life cycle are gradually accepted by users, more and more users will continue to use the plug valve.
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In terms of market demand, the rate of average use demand of them is about 8 : 1, meaning, every time 8 ball valve are used, 1 plug valves will be used. If there is a higher reliability or alloy materials and better cost performance, people can use plug valve to replace ball valve, but ball valve can’t replace plug valve in the occasion where only plug valve can be applicable to.one-piece valve body, top loading design, simple structure, convenient maintenance, no leakage, supportting higher-strength pipe system.. The medium in chemical process has a strong corrosion resistance. In the chemical field, corroded valve body often can be seen. Therefore, the valve in the application of chemical process must have strong permeability and resistance to intergranular corrosion. The body of plug valve should be high-level casting, with casting quality of class II and precision of grade V.Really simple internals. The plug is completely covered by bushing. Body and plug has no wear. Replacing simple and economic bushing or top sealing device can complete the maintenance and update of the valve. Plug valve can reach long-term use requirement of 300 ℃, which has considerable competitive edge compared with ball valve that belongs to this application.Top surface and flange are all the processing surface of plug valve. Other parts are all one-time casting molding. The inside of valve body has no processing. Comparing with ball valve, it has the advantages of lower machining allowance. Especially, when the material is INCONEL, MONEL, HARTZ alloy, plug valve has the distinct advantage of price.According to the user's demand, various designs of plug valve can achieve a specific function. Plug valves is the best one of customized products. Plug valve is easy to cater to custom design, can be made into three-way, four-way, five-way and six-way valve; double valve group or valves group; all kinds of jacket requirements, etc.. For example, the six-way distribution valve used in polyester industry is designed according to the requirements of patent owners, while the ball valve is difficult to made in line with custom design.Now, no clearance and face sealing are still the unique features of the plug valve. Although it has the design of the clearance like ball valve’s, the clearance just can be reduced to 1 ~ 3 mm at the most, which can't achieve the application advantages of coated surface sealing. This characteristic of plug valves enable it to deal with a lot of harsh medium, such as easy crystal and viscous fluid or those medium containing catalyst particles and deposit.Coated bushing provides the characteristics of face sealing. It can be strictly controlled in accordance with the test requirements of zero leakage of API 598 soft sealing valve seat, achieving or sealing requirements of stem of TA Luft or ISO 15848.Comprehensive characteristics of plug valve are long service life, high reliability. It is a good choice for a lot of corrosive, abrasive and toxic fluid as well as continuously operated device. It has the application advantages and extensive applicability in the field of chemical industry.. The design of face sealing improves the requirements for driving torque. In the case of needing be equipped with pneumatic actuators, compared with ball valve, it will cost much more. Such as PP process, main shut-off valve of it is the plug valve, rather than the ball valve, but the high frequency switching valve is ball valve. Therefore, basically, the pneumatic plug valves are applied to the key cut-off position. Plug valve is not recommended to apply it to the occasion of adjustment, since the high frequency switching is not the advantage of it. It is the cut-off valve of high reliability.. In some applications, the incorrect choice of bushing material or improper design of the release area of bushing deformation may cause swelling for PTFE bushing materials, leading to the change of driving torque for several times.. Though the investment of plug valve is more than ball valve, as its advantages of reliability and the total cost of life cycle are gradually accepted by users, more and more users will continue to use the plug valve.