MECH 289Design GraphicsDesign Graphics Project ’07

February 1, 2007

1 Introduction

This year’s project -sorry about those pesky inch (′′) dimensions, they come with plumbing allover the world- is quite different from last year’s. It focuses on

• Interpreting preliminary drawings of an existing product; a 12

′′bronze globe valve for sol-

der connection to rigid copper pipe in a domestic plumbing system and with provision fordraining the outlet run when the valve is shut.

• Creating solid models of all manufactured (as opposed to “bought”) components that requiredetail drawings.

• Producing these details in proper title-blocked format, properly dimensioned and process,material and dimension annotated.

• Producing a solid model for assembly and an appropriate sectioned assembly drawing withdetails identified and a bill of material for the bought components.

Nevertheless click on last year’s project. You can learn a lot by reading through it to see whata design oriented project (as opposed to a “working-drawing” one) looks like. Take a look at mynotice board to the left of ENGMD 454. Posted there is a final submission poster that received aslightly above average grade. The to the left of ENGMD 455 there is a wall mounted glass displaycase in which last year’s best poster appears. These posters will give you an idea about the finalproduct upon which you will be judged so as to obtain a major fraction of your course grade.Note the use of free hand sketches to plan your work. This document (the one you’re reading now,not the posters) will grow as the project develops. Finally, all preliminary detail drawings appearas figures in this document. More information, instructions and amendments will be provided asdeemed necessary. Keep your eye on this document and the figures it contains.

2 The Parts and Two Details; More to Come

Fig. 1 shows the valve connected to a bit of pipe on one side while Fig. 2 shows it disassembledwith an attempt to arrange parts as they go together; a sort of photographic “exploded” view”.Note the septum, indicated with black marker on the outside of the valve body, that separatesthe input from the output chambers, contains the valve seat against which the 5

8

′′diameter rubber

seal presses and will provide you with somewhat of a solid modeling challenge. A drawing of thevalve body appears in Fig. 5. A section view is included in an attempt to better describe theseptum. Notice the small fitting on the side that allows the output leg, downstream of the valve,to be drained. This fitting accepts the screw-on cap, Fig. 8. The other, possibly greatest, solid

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modeling challenge in the project is the valve handle that appears in Fig. 7. Fig. 3 shows the valvestem guide, the part that screws into the valve body, not detailed as yet. Fig. 4 shows the valvestem itself that screws into the stem guide and accepts the red wheel, the valve handle. Try toimagine how everything goes together by studying Figs. 1 and 2 while examining the individualdetails as well as the miscellaneous bits and pieces that appear in Fig. 9. Make up descriptivenames for these seven parts so you will remember them, where they go and what they do.

Figure 1: A 12

′′Solder Connection Domestic Globe Valve

(MECH289)DGP7W71o.tex

2

Figure 2: Disassembled Valve

3

stem guide

STGD71n

11/16 - 16N x 5/16LG

13/16 - 12N x 1/4LG

3/32

1/4

7/16 x 1/4DP BORE; DO NOT TAP INTO BORE.

5/8 x 45 C’SINK

23/32

1/2 - 12N

CHAMFER BOTH

ENDS 1/32 x 45

1-1/8

Figure 3: Valve Stem Guide

Valve Stem

VSTEM71n

5/321/4

1/2-12N x 3/8LG

1/4-20NC x 1/4LG

5/16

1/41/32 x 45 CHAMFER

5/8

21/32

7/64DP

1/32 x 45 CHAMFER

#6-32NC x 13/64DP

1/2

2-17/32

Figure 4: Valve Stem

4

26

28

20

53

4

13R

22

12

23

5/16-24NF x 1/4LG

4DRILL THRU

16

10

20

21

16

13/16-12N x 9/32DP

CHAMFER 1/32 x 45

fillets and rounds from 0.5 to 3

RR

wall thickness from 2 to 4

AA

A-A

S I

(289)Vbody71p

Figure 5: Valve Body

5

VBNUT71v

9

19

10

11/16-16N x 11/32DP

DRILL

Figure 6: Valve Bonnet Nut

6

VHdl71s

0 50

A A

B

B

A-AB-B

Figure 7: Valve Handle

7

1

7.5

10

9

4.5

1 DRILL

5/16-24NF x 9/32DP

DCAP71w

Figure 8: Valve Drain Cap

8

2.5

7

21 ID x 24 OD

3.5 THRU

16

5

MISC71w

3.5

54.5

#6-32NC

10

4

1/4-20NC THRU

914 8

11

62.5

11

THRU

1 THK

0.2THK

19.5

6.5

Figure 9: Miscellaneous Seals and Fasteners

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