
STAINLESS STEEL VENT VALVES
NAVSEA 804-1749102/1749103 Rev C
Figure 641 and 661
Round and Oval
Round and Oval


FEATURES
- Designed for use as airtight and watertight closures as well as fire dampers
- MIL-S-901 Shock Test Compliant
- MIL-STD-167-1 Vibration Test Compliant
- Used on All Navy Ship Classes
- Lightweight
- MADE IN THE USA
GENERAL APPLICATIONS
- HVAC Applications
- Intake and Exhaust Air
- Lithium-Ion Battery Storage
- Any application where a firesafe damper is required
TECHNICAL DATA
Size Range: 2-1/2” – 36” Round
7×3” – 30×20” Ova
Body Style: Lug
Pressure Rating: 15 PSI Working
45 PSI Hydrostatic Test
7×3” – 30×20” Ova
Body Style: Lug
Pressure Rating: 15 PSI Working
45 PSI Hydrostatic Test


PART NUMBER NOMENCLATURE
TRIM
PART
SIZE
FIGURE
END VARIATION
360
703
YYY
641 ROUND
661 OVAL
661 OVAL
000
VALVE SIZE – ROUND
PART NUMBER ROUND
VALVE SIZE – OVAL
PART NUMBER OVAL
R2.5 2-1/2″
360-703-025-641-000
K31 7″X3″
360-703-031-661-000
R3 3″
360-703-030-641-000
K32 8″X4″
360-703-032-661-000
R3.5 3-1/2″
360-703-035-641-000
K33 9″X5″
360-703-033-661-000
R4 4″
360-703-040-641-000
K34 11″X6″
360-703-034-661-000
R5 5″
360-703-050-641-000
K35 13″X7″
360-703-035-661-000
R6 6″
360-703-060-641-000
K36 16″X8″
360-703-036-661-000
R8 8″
360-703-080-641-000
K37 20″X9″
360-703-037-661-000
R10 10″
360-703-100-641-000
K38 24″X10″
360-703-038-661-000
R12 12″
360-703-120-641-000
K39 24″X15″
360-703-039-661-000
R14 14″
360-703-140-641-000
K40 30″X16″
360-703-040-661-000
R16 16″
360-703-160-641-000
K41 30″X20″
360-703-041-661-000
R18 18″
360-703-180-641-000
R20 20″
360-703-200-641-000
R24 24″
360-703-240-641-000
R30 30″
360-703-300-641-000
R36 36″
360-703-360-641-000
MATERIALS OF CONSTRUCTION
BODY
CAST 316SS
DISC
CAST 316SS
STEM – UPPER
INCONEL
STEM – LOWER
17-4PH SS
SEAT
SILICONE/INTUMESCENT
BUSHING
SS-BRZ-TFE GARLOCK DU/BRZ
PACKING
SILICONE/GRAPHOIL