Reliability Analytics Corporation
Previous | Next      Search Home

First 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 Last

First 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 Last

Previous | Next      Search Home

CHAPTER VALVE ASSEMBLIES 6.0 TABLE OF CONTENTS 6.1 INTRODUCTION 1 6.2 FAILURE MODES OF VALVE ASSEMBLIES 3 6.3 FAILURE RATE MODEL FOR POPPET ASSEMBLY 6 6.3.1 Fluid Pressure 10 6.3.2 Allowable Leakage 10 6.3.3 Surface Finish 10 6.3.4 Fluid Viscosity 10 6.3.5 Contamination Sensitivity 11 6.3.6 Contact Pressure 12 6.3.7 Physical Dimensions 14 6.3.8 Operating Temperature 14 6.3.9 Other Considerations 14 6.4 FAILURE RATE MODEL FOR SLIDING ACTION VALVES 15 6.4.1 Fluid Pressure 17 6.4.2 Allowable Leakage 18 6.4.3 Contamination Sensitivity 18 6.4.4 Fluid Viscosity 18 6.4.5 Spool-to-Sleeve Clearance 19 6.4.6 Friction Coefficient 19 6.5 FAILURE RATE ESTIMATE FOR HOUSING ASSEMBLY 19 6.6 REFERENCES 32 6.1 INTRODUCTION This chapter contains procedures for evaluating fluid valve assemblies for reliability that can be used to support the development of mechanical equipment. The procedures are intended to focus attention on possible failure modes of a valve assembly and project the rate of failure for the valve in its intended operating environment. A valve is a device that regulates the flow of a fluid including gases, liquids and fluidized solids by opening, closing or adjusting various passageways. A typical valve assembly is shown in Figure 6.1. Valve Assemblies 6-1 Revision E

Toolkit Home

Reliability Analytics Corporation
reliabilityanalytics.com