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991-3 — Technical Data Sheet

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Giochi Preziosi · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The RESPIRATOR,AIR FILTERING is a Giochi Preziosi industrial component. Key specifications include material: STEEL OVERALL, mask_type: HALF FACEPIECE, head_angle: 15.0 DEGREES NOMINAL, body_length: 0.562 INCHES NOMINAL IN, filter_type: FILTER PAD, skirt_style: STEPPED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4820-00-388-6885, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
991-3
NSN: 4820-00-388-6885
FSC: 4820
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
mask_typeHALF FACEPIECE
head_angle15.0 DEGREES NOMINAL
body_length0.562 INCHES NOMINAL IN
filter_typeFILTER PAD
skirt_styleSTEPPED
head_harnessNOT INCLUDED
skirt_designNONDETACHABLE
exhaust_valveNOT INCLUDED
overall_depth0.512 INCHES NOMINAL IN
rating_methodWINDING TURNS SINGLE COMPONENT SINGLE WINDING
turn_quantity50 SINGLE COMPONENT SINGLE WINDING
NSN4820-00-388-6885
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 991-3 · Giochi Preziosi ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STYLE DESIGNATOR: PLAIN FLANGED
•
SEATING SURFACE SHAPE: ANGULAR
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORPLAIN FLANGED
SEATING SURFACE SHAPEANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
991-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
978018-3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
PR414-1FG10InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
K-900B-1/4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
7000034740InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
6NHK5InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 991-3?
991-3 is a RESPIRATOR,AIR FILTERING manufactured by Giochi Preziosi.
What parts can replace 991-3?
There are 15 known substitutes for 991-3: 991-4, 978018-3, PR414-1FG10 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 991-3?
991-3 is cataloged in the Federal Logistics Information System under NSN 4820-00-388-6885. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026