BUTTERFLY VALVE ASSEMBLY

AIM:To assemble all the parts of the butterfly valve and to apply GD&T to the assemblec component in the drawing sheet.

INTODUCTION:A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disc that rotates insdie the body.The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

MODELLING:

• Goto>>NX CAD>>NEW>>ASSEMBLE>>ADD COMPONENTS.
• Add all the components of the butterfly value and by using move command separate the pats according to our convienence.
• First the shaft is to be attached with the disc/plate by using assemble constraints like Touch,Infer Center/Axis and then insert the scres by suing the infer center/axis,touch commands.
• Now the whole part is to be attached with the body of the butterfly value by using Touch,Infer Center/Axis,then the retainer and lever,nut are to be attched in the same manner providing tnhe required contsrints to restrict the d.o.f of the part.

COMPONENTS OF THE BUTTERFLY VALVE:

• Body

• Shaft/Stem

• Retainer

• Disc/Plate

• Lever

• Nut

• Screw

ASSEMBLED COMPONENT

DRAFTING:

Now we need to provide GD&T for the parr we assembled,for tht selcet the 3 holes as the primary datums and then provide required tolerances over there.later take one of the hole as secondary datum and the opposite as the teritanry datum and apply the tolerances.

CONCLUSION:The assembling all the parts of the butterfly valve is done by using NX CAD and applying of GD&T to the assemblec component in the drawing sheet is also done.