Diameter of Valve Stem Calculator

✖Diameter of Port is the diameter of the opening of the port of an IC Engine.ⓘ Diameter of Port [d_p]			+10% -10%
✖Tensile Stress in Valve Stem is the amount of tensile stress induced into the valve stem due to the tensile spring force acting on it.ⓘ Tensile Stress in Valve Stem [σ_t]			+10% -10%
✖Thickness of Valve Disk is the thickness of the circular valve disk of a valve and is the part of valve head.ⓘ Thickness of Valve Disk [t]			+10% -10%
✖Spring Force on Seated Valve is the force exerted by the valve spring onto the valve when it is seated.ⓘ Spring Force on Seated Valve [P_sp]			+10% -10%

✖Diameter of Valve Stem is the diameter of the lowermost part of the valve (valve stem).ⓘ Diameter of Valve Stem [d_s]

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Formula

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Diameter of Valve Stem

Formula

`"d"_{"s"} = 1.5*"d"_{"p"}*(1-("σ"_{"t"}*"t"^2)/(1.4*"P"_{"sp"}))`

Example

`"14.72789mm"=1.5*"40mm"*(1-("2.2N/mm²"*("5.5mm")^2)/(1.4*"63N"))`

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Diameter of Valve Stem Solution

STEP 0: Pre-Calculation Summary

Formula Used

Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve))
d_s = 1.5*d_p*(1-(σ_t*t^2)/(1.4*P_sp))
This formula uses 5 Variables

Variables Used

Diameter of Valve Stem - (Measured in Meter) - Diameter of Valve Stem is the diameter of the lowermost part of the valve (valve stem).
Diameter of Port - (Measured in Meter) - Diameter of Port is the diameter of the opening of the port of an IC Engine.
Tensile Stress in Valve Stem - (Measured in Pascal) - Tensile Stress in Valve Stem is the amount of tensile stress induced into the valve stem due to the tensile spring force acting on it.
Thickness of Valve Disk - (Measured in Meter) - Thickness of Valve Disk is the thickness of the circular valve disk of a valve and is the part of valve head.
Spring Force on Seated Valve - (Measured in Newton) - Spring Force on Seated Valve is the force exerted by the valve spring onto the valve when it is seated.

STEP 1: Convert Input(s) to Base Unit

Diameter of Port: 40 Millimeter --> 0.04 Meter (Check conversion here)
Tensile Stress in Valve Stem: 2.2 Newton per Square Millimeter --> 2200000 Pascal (Check conversion here)
Thickness of Valve Disk: 5.5 Millimeter --> 0.0055 Meter (Check conversion here)
Spring Force on Seated Valve: 63 Newton --> 63 Newton No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

d_s = 1.5*d_p*(1-(σ_t*t^2)/(1.4*P_sp)) --> 1.5*0.04*(1-(2200000*0.0055^2)/(1.4*63))

Evaluating ... ...

d_s = 0.0147278911564626

STEP 3: Convert Result to Output's Unit

0.0147278911564626 Meter -->14.7278911564626 Millimeter (Check conversion here)

FINAL ANSWER

14.7278911564626 ≈ 14.72789 Millimeter <-- Diameter of Valve Stem

(Calculation completed in 00.004 seconds)

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Created by Saurabh Patil

Shri Govindram Seksaria Institute of Technology and Science (SGSITS ), Indore

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< 7 Valve Stem Calculators

Thickness of Valve Disk given Force of Spring on Valve

Go Thickness of Valve Disk = sqrt((1.4*Spring Force on Seated Valve*(1-(2*Diameter of Valve Stem)/(3*Diameter of Port)))/Tensile Stress in Valve Stem)

Diameter of Port given Diameter of Valve Stem

Go Diameter of Port = (Diameter of Valve Stem)/(1.5*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve)))

Spring Force on Valve when Seated

Go Spring Force on Seated Valve = ((Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1-(2*Diameter of Valve Stem)/(3*Diameter of Port)))/1.4

Tensile Stress in Valve Stem due to Spring Force on Valve

Go Tensile Stress in Valve Stem = 1.4*Spring Force on Seated Valve/(Thickness of Valve Disk^2)*(1-(2*Diameter of Valve Stem)/(3*Diameter of Port))

Diameter of Valve Stem

Go Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve))

Minimum Diameter of Valve Stem

Go Diameter of Valve Stem = Diameter of Port/8+6.35

Maximum Diameter of Valve Stem

Go Diameter of Valve Stem = Diameter of Port/8+11

Diameter of Valve Stem Formula

Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve))
d_s = 1.5*d_p*(1-(σ_t*t^2)/(1.4*P_sp))

Valve gear mechanism for a vertical engine with overhead valves

The camshaft is rotated by means of a belt drive from the crankshaft. As the camshaft rotates, the cam pushes the follower and the push rod upwards. The rocker arm is pivoted at its center by means of a fulcrum pin. When the right end of the rocker arm is pushed up by the push rod, the left end moves downward. This compresses the spring and pushes the valve rod down in the cylinder, thereby causing the valve to open. When the follower moves over the circular portion of the cam, the spring expands and closes the valve. The spring pushes the left end of the rocker arm upward. This causes the right end to move downward and keeps the follower in contact with the cam. It should be noted that the valve is closed by a helical compression spring.

How to Calculate Diameter of Valve Stem?

Diameter of Valve Stem calculator uses Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve)) to calculate the Diameter of Valve Stem, Diameter of valve stem is the diameter of the lowermost part of the valve (valve stem). Diameter of Valve Stem is denoted by d_s symbol.

How to calculate Diameter of Valve Stem using this online calculator? To use this online calculator for Diameter of Valve Stem, enter Diameter of Port (d_p), Tensile Stress in Valve Stem (σ_t), Thickness of Valve Disk (t) & Spring Force on Seated Valve (P_sp) and hit the calculate button. Here is how the Diameter of Valve Stem calculation can be explained with given input values -> 14727.89 = 1.5*0.04*(1-(2200000*0.0055^2)/(1.4*63)).

FAQ

What is Diameter of Valve Stem?

Diameter of valve stem is the diameter of the lowermost part of the valve (valve stem) and is represented as d_s = 1.5*d_p*(1-(σ_t*t^2)/(1.4*P_sp)) or Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve)). Diameter of Port is the diameter of the opening of the port of an IC Engine, Tensile Stress in Valve Stem is the amount of tensile stress induced into the valve stem due to the tensile spring force acting on it, Thickness of Valve Disk is the thickness of the circular valve disk of a valve and is the part of valve head & Spring Force on Seated Valve is the force exerted by the valve spring onto the valve when it is seated.

How to calculate Diameter of Valve Stem?

Diameter of valve stem is the diameter of the lowermost part of the valve (valve stem) is calculated using Diameter of Valve Stem = 1.5*Diameter of Port*(1-(Tensile Stress in Valve Stem*Thickness of Valve Disk^2)/(1.4*Spring Force on Seated Valve)). To calculate Diameter of Valve Stem, you need Diameter of Port (d_p), Tensile Stress in Valve Stem (σ_t), Thickness of Valve Disk (t) & Spring Force on Seated Valve (P_sp). With our tool, you need to enter the respective value for Diameter of Port, Tensile Stress in Valve Stem, Thickness of Valve Disk & Spring Force on Seated Valve and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Diameter of Valve Stem?

In this formula, Diameter of Valve Stem uses Diameter of Port, Tensile Stress in Valve Stem, Thickness of Valve Disk & Spring Force on Seated Valve. We can use 2 other way(s) to calculate the same, which is/are as follows -

Diameter of Valve Stem = Diameter of Port/8+11
Diameter of Valve Stem = Diameter of Port/8+6.35

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