DV-5 Deluge Valve
Tyco DV-5 Deluge Valve — Standard Deluge and Preaction Fire Protection Systems (Legacy Model).
Inspector Detail
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Common issues
- Diaphragm perishing or cracking, causing the valve to fail to open or to leak
- Trim piping or strainer blockage (scale, marine growth) preventing valve actuation
- Corrosion of the external resetting mechanism seizing the reset lever
- Pilot/solenoid actuator failure in the release trim
- Seawater scaling in trim components affecting reliable operation
- False or failed activation traced back to a fouled or corroded detection system that triggers the valve
Inspection checklist
- Visually inspect valve body, trim piping and gauges for leaks or corrosion
- Function-test valve trip and release, both manual and remote/automatic, per maker procedure
- Check and clean strainers in the trim system
- Verify priming water/supply pressure gauges read correctly and within range
- Confirm the valve resets fully and reseats without residual leakage after test
- Inspect diaphragm condition at scheduled overhaul
- Test the detection/alarm system that triggers the deluge valve
- Check drain valves operate and the system fully drains after test
Service intervals
| Full system function/trip test | per SOLAS/flag and class requirement, commonly quarterly to annually depending on system and flag administration - confirm against the ship's fire safety maintenance plan |
| Trim strainer cleaning | at each function test or per maker schedule |
| Diaphragm inspection/replacement | at the maker's overhaul interval; being a legacy model, confirm current interval and material availability directly with Tyco/Johnson Controls or an approved service agent |
| Weekly/monthly visual and gauge checks | per SOLAS fire safety maintenance requirements |
Critical spares
- Diaphragm/trim kit - legacy model, confirm current availability with the maker or an approved service agent before assuming a generic part fits
- Trim strainer element
- Pilot/solenoid actuator (if electrically released)
- Valve cover gasket set
- Supply/system side pressure gauges
Safety
- Accidental discharge risk during testing - warn personnel and isolate the protected area/machinery before function tests
- Trapped pressure in trim piping - depressurise before opening the valve cover or trim components
- Failure to actuate in a hazardous area (e.g., cargo pump room, machinery space) is a life-safety issue - treat any defect as high priority
- As a legacy model, spares support may be limited - assess the case for replacement with a current-production deluge valve if reliability or spares become a problem
Class survey
Fixed fire suppression systems are statutory under SOLAS II-2. Class/flag surveys require documented function and flow test records, servicing by an approved fire safety service provider where required, and confirmation that all deluge zones actuate and drain correctly. Legacy equipment like this DV-5 is scrutinised particularly for spares support and an equivalent-replacement plan.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect for water or air leakage from bonnet cover and outlet drain; verify no external moisture on diaphragm chamber; perform annual full trip test to verify diaphragm response and proper valve opening
Clean strainer in diaphragm chamber supply control valve; inspect for sediment, corrosion debris, or mineral deposits; perform internal inspection of strainers every 5 years per NFPA 25; replace if significant blockage detected
Verify dry pilot line air pressure maintained at design pressure (typically 40-50 psi); check for air leaks at connections; ensure air drier functioning and dew point below lowest ambient temperature; test pressure gauge reading weekly
Inspect all deluge nozzles/sprinklers for corrosion, mechanical damage, or buildup; verify proper orientation and alignment; check for blockage or paint over orifices; ensure DN-5 duct nozzles maintain HALAR coating integrity
Check for external corrosion on valve body, actuators, and piping; verify bonnet bolts are tight; inspect manual reset actuator (MRA-1) for damage; ensure dry pilot actuators (DP-1/DP-2) have no water/air leakage at drain outlet
Type-general inspection and maintenance points for this equipment category — not model-specific.
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