Spring Force on Valve when Seated Calculator

✖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%
✖Diameter of Valve Stem is the diameter of the lowermost part of the valve (valve stem).ⓘ Diameter of Valve Stem [d_s]			+10% -10%
✖Diameter of Port is the diameter of the opening of the port of an IC Engine.ⓘ Diameter of Port [d_p]			+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 Valve when Seated [P_sp]

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Formula

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Spring Force on Valve when Seated

Formula

`"P"_{"sp"} = (("σ"_{"t"}*"t"^2)/(1-(2*"d"_{"s"})/(3*"d"_{"p"})))/1.4`

Example

`"63.38095N"=(("2.2N/mm²"*("5.5mm")^2)/(1-(2*"15mm")/(3*"40mm")))/1.4`

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Spring Force on Valve when Seated Solution

STEP 0: Pre-Calculation Summary

Formula Used

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
P_sp = ((σ_t*t^2)/(1-(2*d_s)/(3*d_p)))/1.4
This formula uses 5 Variables

Variables Used

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.
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.
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.

STEP 1: Convert Input(s) to Base Unit

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)
Diameter of Valve Stem: 15 Millimeter --> 0.015 Meter (Check conversion here)
Diameter of Port: 40 Millimeter --> 0.04 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_sp = ((σ_t*t^2)/(1-(2*d_s)/(3*d_p)))/1.4 --> ((2200000*0.0055^2)/(1-(2*0.015)/(3*0.04)))/1.4

Evaluating ... ...

P_sp = 63.3809523809524

STEP 3: Convert Result to Output's Unit

63.3809523809524 Newton --> No Conversion Required

FINAL ANSWER

63.3809523809524 ≈ 63.38095 Newton <-- Spring Force on Seated Valve

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Design of IC Engine Components » Engine Valves » Valve Stem » Spring Force on Valve when Seated

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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

Spring Force on Valve when Seated Formula

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
P_sp = ((σ_t*t^2)/(1-(2*d_s)/(3*d_p)))/1.4

Construction of Poppet valve of an IC Engine

The poppet valve consists of a disk called ‘head’ at the end of a rod called ‘stem’. The ‘face’ of the valve is a conical surface that comes in contact with a valve seat It has a face angle varying from 30° to 45°. The conical surface of the valve results in the self-centering property. There is a small margin between the head and the face. There are two reasons for providing the margin—it avoids the sharp edges and a provision is made for regrinding of the valve. The lower end of the valve stem has a groove. A spring retainer is fitted in this groove, which supports one end of the valve spring. In slow-speed engines, valves have composite construction with a cast iron head and steel stem. In high-speed engines, one-piece construction is used and valves are forged.

How to Calculate Spring Force on Valve when Seated?

Spring Force on Valve when Seated calculator uses 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 to calculate the Spring Force on Seated Valve, Spring force on valve when seated is the force exerted on the valve due compression and expansion of the spring attached to it. Spring Force on Seated Valve is denoted by P_sp symbol.

How to calculate Spring Force on Valve when Seated using this online calculator? To use this online calculator for Spring Force on Valve when Seated, enter Tensile Stress in Valve Stem (σ_t), Thickness of Valve Disk (t), Diameter of Valve Stem (d_s) & Diameter of Port (d_p) and hit the calculate button. Here is how the Spring Force on Valve when Seated calculation can be explained with given input values -> 63.38095 = ((2200000*0.0055^2)/(1-(2*0.015)/(3*0.04)))/1.4.

FAQ

What is Spring Force on Valve when Seated?

Spring force on valve when seated is the force exerted on the valve due compression and expansion of the spring attached to it and is represented as P_sp = ((σ_t*t^2)/(1-(2*d_s)/(3*d_p)))/1.4 or 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 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, Diameter of Valve Stem is the diameter of the lowermost part of the valve (valve stem) & Diameter of Port is the diameter of the opening of the port of an IC Engine.

How to calculate Spring Force on Valve when Seated?

Spring force on valve when seated is the force exerted on the valve due compression and expansion of the spring attached to it is calculated using 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. To calculate Spring Force on Valve when Seated, you need Tensile Stress in Valve Stem (σ_t), Thickness of Valve Disk (t), Diameter of Valve Stem (d_s) & Diameter of Port (d_p). With our tool, you need to enter the respective value for Tensile Stress in Valve Stem, Thickness of Valve Disk, Diameter of Valve Stem & Diameter of Port and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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