Blueprint Reading 257
dharm
d:\N-Design\Des17-1.pm5
connected to the cover (9) by two pillars (11). The bottom end of the spindle is connected to the
valve in such a way that it transmits vertical motion but not the rotational one.
The steam passage is completely closed when the valve is in its bottom most position,
but as it is lifted, the passage slowly increases. Thus, steam regulation is achieved. The gland
(10), which is secured to the cover (9) with two studs (12), prevents steam leakage through the
cover. The stop valve is connected to the steam pipe, through flanges provided in the housing (1).
Read the assembly drawing and answer the following :
1. What is the material of the spindle and what is its thread specification?
—Mild steel, square thread: SQ40 × 8 mm
2. What is the total length of the spindle?
—374 mm
3. What is the thread size of the studs (13)?
— M 18
4. What is the material of the gland? And what is its bore and height?
—Bronze, Bore-φ 32, Height-42 mm
5. What are the flange bore and outside diameter?
—φ 96 and φ 228
6. What is the size of the hand wheel and its arm thickness?
—φ 240, 10 mm
7. What is the size of the spindle, where the hand wheel is fitted?
—SQ 24 mm
8. What is the pitch of the spindle thread and the depth?
—8 mm and 4 mm
9. What is the size of the slot in the valve that fits on to the spindle?
—φ 45 × 12 mm
10. What is the taper on the valve seat?
—45°
11. What is the height of the stud nut?
—18 mm
12. Wht is the length of the stud (13)?
—70 mm
13. What is the thickness of the valve flange?
—24 mm
14. How many studs are there to fix the cover (9) and how they are located?
—5 Nos. at 200 PCD
15. What is the bush height?
—44 mm
17.3 Exercises
17.3.1 Worm Gear Housing
The orthographic views of a worm gear casing are shown in Fig. 17.5. Read the drawing and
answer the following:
