FM 1041 : 2006

1 INTRODUCTION
  1.1 Purpose
  1.2 Scope
  1.3 Basis for Requirements
  1.4 Basis for Approval
  1.5 Basis for Continued Approval
  1.6 Effective Date
  1.7 System of Units
  1.8 Applicable Documents
  1.9 Definitions
2 GENERAL INFORMATION
  2.1 Product Information
  2.2 Approval Application Requirements
  2.3 Requirements for Samples for Examination
3 GENERAL REQUIREMENTS
  3.1 Review of Documentation
  3.2 Physical or Structural Features
  3.3 Clearances
  3.4 Materials
  3.5 Markings
  3.6 Manufacturer's Installation and Operation Instructions
  3.7 Calibration
4 PERFORMANCE REQUIREMENTS
  4.1 Examination
  4.2 Clapper Strength
  4.3 Resilient Seat (Reverse Flow) Leakage
  4.4 Metal-To-Metal Seat Leakage
  4.5 Hydrostatic Strength - Alarm Check Valve
  4.6 Hydrostatic Strength - Trim Piping
  4.7 Friction Loss Determination
  4.8 Cycle Test
  4.9 Bonding Adequacy
  4.10 Water Absorption
  4.11 Aging
  4.12 Minimum Operational Flow Test
  4.13 Sensitivity Test
  4.14 Additional Tests
5 OPERATIONS REQUIREMENTS
  5.1 Demonstrated Quality Control Program
  5.2 Facilities and Procedures Audit (F&PA)
  5.3 Manufacturer's Responsibilities
  5.4 Manufacturing and Production Tests
APPENDIX A: UNITS OF MEASUREMENT
APPENDIX B: FM APPROVED MARKS
APPENDIX C: DRAWINGS
  Figure C-1. Periphery of the Clapper and the Inside of
              the Body Clearances
  Figure C-2. Hub of the Clapper Arm and Inside of the
              Body Clearances
  Figure C-3. Hinge Pin Clearances
APPENDIX D: TEST SET-UP DIAGRAM
APPENDIX E: SAMPLE LISTING

Comprehends the design and performance requirements for differential and pilot valve type alarm check valves. These valves are installed in wet sprinkler systems in either the vertical or horizontal orientation.