News - Ball valve overview and features

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Home > News > Ball valve overview and features

Ball valve overview and features - 2013-12-26 10:15:34

Sphere with a round ball with a through hole for the opening and closing parts , turning ball with stem , in order to achieve the valve opening and closing action . Ball is evolved by the plug , also known as spherical plug . Ball valve opening and closing parts as a sphere , the use of the sphere around the stem axis rotated 90 degrees to achieve the purpose of opening and closing .

Ball valve for cutting off the main pipeline , the medium flow direction and changing the distribution , designed V -shaped opening of the ball valve also has a good flow regulation. Just use the rotary ball valve operation and a small 90-degree rotational torque can be closed tightly . Full equality body cavity for the media provides little resistance, through the flow channel. Ball is not only simple structure, good sealing performance, but also in smaller nominal within a certain range pass through the volume , light weight, less material consumption , small installation size, and the drive torque is small , easy to operate , easy to open and close fast , easy to operate and maintenance for water, solvents, acids and gas work in general media , but also for the poor working conditions of media , such as oxygen , hydrogen peroxide , methane and ethylene. The ball valve may be integral or may be modular .

Ball is the advent of the 1950s a new type of valve. In just 30 years, is one of the valves of the fastest growing varieties of the last decade . Especially in the United States, Germany , Japan, France , Italy, Spain , Britain and other industrialized countries , the ball valve is widely used, the use of the variety and quantity continues to expand , and to high temperature , high pressure, big mouth , high tightness , long life , excellent performance and a regulating valve multi-direction , its reliability , and other performance indicators have reached a higher level , and has been partially replaced valve, globe valve, throttle valve . It is in many ways the aerospace, petrochemical, long- distance pipelines , light food , and construction have been widely used. This is because , compared with other ball valves, has many distinct advantages . The main features of valve as follows :

( 1 ) Ball fluid resistance is small, has the lowest flow resistance ( virtually zero )

Ball valves are generally reduced diameter and diameter indented channel two structures. In either configuration, the ball valve flow resistance coefficient are relatively small. Especially the so-called full-flow type, that is indented diameter ball valve, due to its channel diameter equal to the inner diameter of the pipe , the loss of local resistance equivalent length of pipe friction only , that all valves , minimum flow resistance of this ball . In the rocket launch and test systems requiring resistance to pipelines as small as possible . There are two ways to reduce the resistance of the pipeline system : First, reduce fluid flow , which requires increasing the diameter and valve size , it tends to have a negative impact on the economy of the pipeline system , especially for low-temperature delivery system ( liquid hydrogen ) is extremely unfavorable ; One is to reduce local resistance of the valve, therefore , ball naturally became the best choice.

(2) Ball valve opening and closing switch quickly and easily.

Because the ball valve handle is rotated 90 ° only in general completed fully on or off operation, is easy to achieve rapid opening and closing. Fast opening and closing, opening and closing times of certain structures of only 0.05 ~ 0.1s, in order to secure for the test bed automation system. Rapid opening and closing valves, operating without impact.

(3) Good ball sealing performance.

Currently, the vast majority of ball valve seat is PTFE and other flexible materials, metallic and non-metallic materials consisting of sealing, commonly referred to as a soft seal. In general, the soft seal tightness easily guaranteed, and the sealing surface machining accuracy and surface roughness requirements are not very high.

( 4 ) Ball long life .

Since Teflon has good self-lubricating, wear of the friction with the small sphere , and the sphere due to the improved process , so that roughness is reduced , thereby increasing the service life of the ball valve . According to reports, the U.S. company in the test chamber WKM life test on the ball , switching frequency of more than 100,000 times.

( 5 ) Ball high reliability is mainly because:

① Ball and a pair of sealing seat abrasion does not occur , rapid wear fault , not stuck at work ( without lubricant ) , it can be reliably applied with the corrosive medium and low boiling liquid. ;

② Built- stem structure , eliminating the stem under fluid pressure may be due to the packing gland to release while flying accidents ;

③ The use of anti-static, fire-resistant structures ball for transporting oil , natural gas, coal gas pipeline .

( 6) The valve body is more suitable transport channel is smooth viscous fluid . Slurry and solid particles.

( 7 ) Because not stuck at work ( in the absence of lubricant ) , it can be reliably applied with the corrosive medium and low boiling liquid.

( 8 ) Ball off pieces can be automatically positioned at the position, and can withstand high differential pressure when closed .

( 9 ) In the larger ground pressure and temperature range, can be fully bi-directional sealing .

( 10 ) In the fully open and fully closed, the sealing surface and the dielectric isolation of the ball and seat , thus high speed through the medium does not cause erosion of the valve sealing surface .

( 11 )Compact structure, light weight , can be considered the most reasonable cryogenic valve structure when it is used in the media system .

( 12 ) Body symmetry , especially when welded body structure is well positioned to withstand the stress from the pipe.

( 13 ) Fully welded ball valve body can be buried in the ground , so that the valve member from erosion , the maximum service life of up to 30 years, oil , natural gas pipeline valve ideal .

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve

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