Welded flange globe valve has the following advantages: simple structure, manufacturing and maintenance more convenient. Working
stroke is small, open and close a short time. Welded flange globe valve sealing between the sealing surface friction, longer life
expectancy. Globe valve seal the form of points, packing seal globe valves and bellows sealed stop valve. The cut-off valve is only
applicable to the fully open and fully closed is not allowed to make adjustments and to reduce expenditure. The same time, the role of
media, this form of valve more closely. The valve of "three to" has been provided, closing the valve the flow of all top-down. Welded
flange globe valve opening and closing parts of the plug-shaped valve, sealing appear before the plane or cone, the valve in a straight
line along the center line of the fluid. Stem form of exercise, lift rod (stem down, hand wheel lift), lift the rotating rod (the hand
wheel and stem with rotating movements, nuts located in the body).
Welded flange cut-off valve installation and maintenance should note the following: hand wheel, lever operated stop valve can be
installed in any position on the pipeline. The shortcomings of the cut-off valve is as follows: fluid resistance, the larger force
required to open and close. Flange type of cutoff valve stem threads to the location of points and external thread, internal thread. By
the flow of media, straight-through, DC and angular hand wheels, handles and Wei mechanism, does not allow for lifting with. The flow of
media should be consistent with the body shown in the arrow direction. Flange does not apply to cut-off valve for particles with a
larger viscosity, easy coking media. Regulation performance is poor. Cut-off valve is opened, the valve opening height is the nominal
diameter of 25% to 30%, the flow has reached the maximum, indicating that the valve has reached the fully open position. Cut-off valve
fully open position, the stroke of the valve should be to decide.Pipe Fittings
Welded flange globe valve is mandatory sealed valves, the valve is closed, the pressure must be applied to the valve to force the
sealing surface does not leak. When six o clock of the media from the bottom of the valve into the valve, the operating force required
to overcome the resistance, the friction force of the stem and the packing and thrust generated by the pressure of the media, and close
the valve force than the force to open the valve, so valve the diameter of the rod, otherwise they will be the failure of the stem top
bend. In recent years, from the emergence of the self-sealing valve, globe valve flow direction of medium change from the top of the
valve into the valve chamber, this time in the role of the media pressure, the force is small and close the valve, and force open the
valve, the valve stem diameter can be reduced accordingly.
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