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A lever loaded safety valve has a diameter of 100 mm and the blow off pressure is 1.6 N / mm². The fulcrum of the lever is screwed into the cast iron body of the cover. Find the diameter of the threaded part of the fulcrum, if the permissible tensile stress is limited to 50 MPa and the lever ratio is 8.

Question-AnswerCategory: Machine DesignA lever loaded safety valve has a diameter of 100 mm and the blow off pressure is 1.6 N / mm². The fulcrum of the lever is screwed into the cast iron body of the cover. Find the diameter of the threaded part of the fulcrum, if the permissible tensile stress is limited to 50 MPa and the lever ratio is 8.
John asked 4 months ago

A lever loaded safety valve has a diameter of 100 mm and the blow off pressure is 1.6 N / mm².  The fulcrum of the lever is screwed into the cast iron body of the cover.  Find the diameter of the threaded part of the fulcrum, if the permissible tensile stress is limited to 50 MPa and the lever ratio is 8.

1 Answers
Maweto answered 4 months ago

 
 

Solubout
Given that,
P
Diameter of the valve, d = 100 mm
Blow off pressure, P=1.6 MPa = 1,62 mm
P
ermissible to tensile stresLoad at the end of the lever,
load achre on the value
Ο
leverage rabo
125.66.4
= 1570.8 N
8
load on the tulerum,
-load act
th(de 1o985. Exu
?
2
\
Tx50
(de) ² = 280
2
de=16.73 mm
dc=17mm.
The diameter of threaded past is 17mm

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