ISRI

Valve Spring Designer

Installed height driven design with multi-spring packs and constraint analysis.

Proposed Engineering Audit
k403.17
Baseline

System Inputs

1.300
Mass Components
128.2

Spring Pack

Enabled
OD (Outer) ≈ 1.177
ID (Inner) ≈ 0.823
Material & Specifications
Tensile Rm
1778 MPa
Allow. [τ]
889 MPa
Modulus G
79.3 GPa
Density
7.85 g/cm³
Max Service Temp121°C
Thermal RelaxationRelaxation: Low

⚠ Operating temp (148.88888888888889°C) exceeds material limit. Expect significant load loss due to thermal relaxation.

Typical apps:Precision springs, high cycle fatigue

Results

Metric
Pack Total
outer
Rate (lb/in)
403.2
403.2
Seat Load (lb)
282.2
282.2
Open Load (lb)
483.8
483.8
Bind Ht (in)
Min: 0.973
0.973
Status
FAIL
Bind Margin:0.267" (27%)
Nat Freq:118 Hz
Critical Resonance Risk
Freq 118Hz < 10th Order (708Hz)

Quality Control Requirements

Goodman Fatigue Envelope (Primary Spring)
Fatigue Failure Risk
Material
Chrome Silicon
Goodman Safety Factor
0.49
Operating Point: (1212.7 MPa, 319.1 MPa)
Quality Audit Trail
Seat Force @ Installed Height InspectionREQUIRED

Ensure correct preload.

METHOD: Force GaugeFREQ: 100%ACC: +/- 5% of target
Open Force @ Open Height InspectionREQUIRED

Ensure correct peak load.

METHOD: Force GaugeFREQ: 100%
Bind Margin Clearance VerificationREQUIRED

Prevent catastrophic coil bind.

METHOD: Height GaugeFREQ: Sample per lot
Request cert tensile from supplierRECOMMENDED

Design used generic spec range; actual values ensure safety margin.

FREQ: One-time
ProposedProposed

System Inputs

1.300
Mass Components
128.2

Spring Pack

Enabled
OD (Outer) ≈ 1.177
ID (Inner) ≈ 0.823
Material & Specifications
Tensile Rm
1778 MPa
Allow. [τ]
889 MPa
Modulus G
79.3 GPa
Density
7.85 g/cm³
Max Service Temp121°C
Thermal RelaxationRelaxation: Low

⚠ Operating temp (148.88888888888889°C) exceeds material limit. Expect significant load loss due to thermal relaxation.

Typical apps:Precision springs, high cycle fatigue

Results

Metric
Pack Total
outer
Rate (lb/in)
403.2
403.2
Seat Load (lb)
282.2
282.2
Open Load (lb)
483.8
483.8
Bind Ht (in)
Min: 0.973
0.973
Status
FAIL
Bind Margin:0.267" (27%)
Nat Freq:118 Hz
Critical Resonance Risk
Freq 118Hz < 10th Order (708Hz)

Quality Control Requirements

Goodman Fatigue Envelope (Primary Spring)
Fatigue Failure Risk
Material
Chrome Silicon
Goodman Safety Factor
0.49
Operating Point: (1212.7 MPa, 319.1 MPa)
Quality Audit Trail
Seat Force @ Installed Height InspectionREQUIRED

Ensure correct preload.

METHOD: Force GaugeFREQ: 100%ACC: +/- 5% of target
Open Force @ Open Height InspectionREQUIRED

Ensure correct peak load.

METHOD: Force GaugeFREQ: 100%
Bind Margin Clearance VerificationREQUIRED

Prevent catastrophic coil bind.

METHOD: Height GaugeFREQ: Sample per lot
Request cert tensile from supplierRECOMMENDED

Design used generic spec range; actual values ensure safety margin.

FREQ: One-time
Valve Spring Designer | Installed Height & Spring Pack Analysis