News - Advantages and disadvantages of gate structure

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Home > News > Advantages and disadvantages of gate structure

Advantages and disadvantages of gate structure - 2014-03-03 10:01:31

Gate advantages:

( 1 ) Fluid resistance because the media path inside the valve body is straight and does not change its medium flows through the valve when the flow direction , so the fluid resistance.

( 2 ) Opening and closing torque is small, open and close more effort because the direction of movement of the gate valve opening and closing the medium flow direction perpendicular when compared with globe valves , gate valves open and close more effort.

( 3 ) Medium flow unrestricted , no spoilers , do not reduce the pressure on both sides of the media can flow in any direction from the gate , can achieve the purpose of use. More applicable to the flow direction of the medium may change the pipeline .

( 4 ) Because of the shorter length of the structure vertical gate valve is placed in the valve body , and the cut-off valve flap valve body is placed horizontally , so the structure is shorter than the cut-off valve .

( 5 ) Good sealing performance full sealing surface by erosion small.

( 6 ) When fully open, the sealing surface by erosion of the working medium is smaller than the cut-off valve.

( 7 ) Is relatively simple shape , good casting process , a wide range of applications.

Gate disadvantages:

( 1 ) Easy to damage the sealing surface when opening and closing the gate and seat sealing contact between the two relative friction , easy to damage, which affects the life of the seal with the more difficult maintenance.

( 2 ) Long opening and closing time , height and large due to the valve must be fully open or fully closed , the shutter opening and closing stroke is large , open with to a certain space, high dimensions , larger space required for installation .

( 3 ) The general structure of the complex has two valve sealing surface, to machining , grinding and repair some additional , more difficult parts , manufacturing and maintenance more difficult , the cost is higher than the cut-off valve .

Gate Path contraction :

If a channel diameter of the valve body is not the same ( often through the valve seat diameter smaller than the diameter of the flange connection ) , called Path contraction.

Path shrink parts sizes shrink, opening and closing force required is reduced accordingly , while broadening the scope of application components. But diameter contraction . Fluid resistance loss increases.

Under ( such as the oil sector pipeline ) certain working conditions in certain sectors , does not allow the use of the valve diameter contraction . This aspect is to reduce the resistance loss of the pipeline , on the other hand in order to avoid the obstacle to shrink diameter pipeline cleaning machinery .

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

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