Products
Rewards 
from HOLOOLY

We are determined to provide the latest solutions related to all subjects FREE of charge!

Please sign up to our reward program to support us in return and take advantage of the incredible listed offers.

Enjoy Limited offers, deals & Discounts by signing up to Holooly Rewards Program

HOLOOLY 
BUSINESS MANAGER

Advertise your business, and reach millions of students around the world.

HOLOOLY 
TABLES

All the data tables that you may search for.

HOLOOLY 
ARABIA

For Arabic Users, find a teacher/tutor in your City or country in the Middle East.

HOLOOLY 
TEXTBOOKS

Find the Source, Textbook, Solution Manual that you are looking for in 1 click.

HOLOOLY 
HELP DESK

Need Help? We got you covered.

Chapter 3

Q. 3.2

The valve seat fitted inside the housing of a pump is shown in Fig. 3.26. Calculate
(i) the maximum and minimum diameters of the housing and valve seat; and
(ii) the magnitude of the maximum and minimum interferences between the seat and housing.

Step-by-Step

Verified Solution

Step I Maximum and minimum diameters of the housing and valve seat
From Tables 3.2 and 3.3b, the tolerances for valve seat and housing are as follows:
Housing:

Table 3.2 Tolerances for holes of sizes up to 100 mm (H5 to H11)

H Diameter
steps in mm
5-11 11 10 9 8 7 6 5
ei es to over
0 +60 +40 +25 +14 +10 +6 +4 3 0
0 +75 +48 +30 +18 +12 +8 +5 6 3
0 +90 +58 +36 +22 +15 +9 +6 10 6
0 +110 +70 +43 +27 +18 +11 +8 18 10
0 +130 +84 +52 +33 +21 +13 +9 30 18
0 +160 +100 +62 +39 +25 +16 +11 50 30
0 +190 +120 +74 +46 +30 +19 +13 80 50
0 +220 +140 +87 +54 +35 +22 +15 100 80

Table 3.3b Tolerances for shafts of sizes up to 100 mm (from j to s)

s r p n m k j Diametersteps in
mm
5-7 7 6 5 5-6 6 5 6-7 7 6 6-7 7 6 6-7 7 6 5-6 6 5 7 6 5
ei es ei es ei es ei es ei es ei es ei es ei es ei es to over
+14 +24 +20 +18 +10 +16 +14 +6 +16 +12 +4 +14 +10 +2 +8 0 +6 +4 -4 +6 -2 +4 -2 +2 3 0
+19 +31 +27 +24 +15 +23 +20 +12 +24 +20 +8 +20 +16 +4 +16 +12 +1 +9 +6 -4 +8 -2 +6 -2 +3 6 3
+23 +38 +32 +29 +19 +28 +25 +15 +30 +24 +10 +25 +19 +6 +21 +15 +1 +10 +7 -5 +10 -2 +7 -2 +4 10 6
+28 +46 +39 +36 +23 +34 +31 +18 +36 +29 +12 +30 +23 +7 +25 +18 +1 +12 +9 -6 +12 -3 +8 -3 +5 18 10
+35 +56 +48 +44 +28 +41 +37 +22 +43 +35 +15 +36 +28 +8 +29 +21 +2 +15 +11 -8 +13 -4 +9 -4 +5 30 18
+43 +68 +59 +54 +34 +50 +45 +26 +51 +42 +17 +42 +33 +9 +34 +25 +2 +18 +13 -10 +15 -5 +11 -5 +6 50 30
+56 +86 +75 +69 +42 +61 +55 +32 +62 +51 +20 +50 +39 +11 +41 +30 +2 +21 +15 -12 +18 -7 +12 -7 +6 80 50
+71 +106 +93 +86 +54 +73 +66 +37 +72 +59 +23 +58 +45 +13 +48 +35 +3 +25 +18 -15 +20 -9 +13 -9 +6 100 80

Note: 1. In Tables 3.1 and 3.2a and b, the tolerances are given in microns (1 micron = 0.001 mm).
2. es = upper deviation and ei = lower deviation.

Housing:

20^{\overset{+0.021}{_{+0.000}}}         \text { or } \frac{20.021}{20.000} mm .

Valve seat (outer diameter):

20^{\overset{+0.048}{_{+0.035}}}         \text { or } \frac{20.048}{20.035} mm               (i).

Step II Maximum and minimum interferences
Minimum interference = 20.035 – 20.021 = 0.014 mm
Maximum interference = 20.048 – 20.000 = 0.048 mm                 (ii).