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SW138-21 — RETAINER,SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

SW138-21: RETAINER,SEAT,VALVE.

The RETAINER,SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL, special_features: MFR'S PART NAME IS "WARN RING"; ITEM IS ADJUSTABLE TO FIT NUMEROUS VALVES, end_item_identification: SEAWOLF CLASS SSN, valve_design_control_activity: 01343, valve_size_for_which_designed: 1.500 INCHES IN, material_document_and_classification: ASTM A-743 GR CF8 ASSN STD SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-473-1046, 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
SW138-21
NSN: 4820-01-473-1046
FSC: 4820 — Valves, Nonpowered
CAGE: 01343 — ANDERSON GREENWOOD LP DBA ANDERSON GREENWOOD CROSBY (USA)
SPECIFICATIONS
materialSTEEL
special_featuresMFR'S PART NAME IS "WARN RING"; ITEM IS ADJUSTABLE TO FIT NUMEROUS VALVES
end_item_identificationSEAWOLF CLASS SSN
valve_design_control_activity01343
valve_size_for_which_designed1.500 INCHES IN
material_document_and_classificationASTM A-743 GR CF8 ASSN STD SINGLE MATERIAL RESPONSE
valve_model_number_for_which_designed1-1/2" X 1-1/2" RELIEF VALVE TYPE 2771
NSN4820-01-473-1046
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SW138-21 · OEM ⚠ 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
•
VALVE MODEL NUMBER FOR WHICH DESIGNED: 1-1/2" X 1-1/2" RELIEF VALVE TYPE 2771
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A-743 GR CF8 ASSN STD SINGLE MATERIAL RESPONSE
•
VALVE SIZE FOR WHICH DESIGNED: 1.500 INCHES IN
•
VALVE DESIGN CONTROL ACTIVITY: 01343
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
VALVE MODEL NUMBER FOR WHICH DESIGNED1-1/2" X 1-1/2" RELIEF VALVE TYPE 2771
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A-743 GR CF8 ASSN STD SINGLE MATERIAL RESPONSE
VALVE SIZE FOR WHICH DESIGNED1.500 INCHES IN
SPECIAL FEATURESMFR'S PART NAME IS "WARN RING"; ITEM IS ADJUSTABLE TO FIT NUMEROUS VALVES
VALVE DESIGN CONTROL ACTIVITY01343
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 1
SW138Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SW138-21?
SW138-21 is a RETAINER,SEAT,VALVE.
What parts can replace SW138-21?
There is 1 known substitute for SW138-21: SW138. Substitute compatibility should be verified for your specific system.
What is the NSN for SW138-21?
SW138-21 is cataloged in the U.S. Government catalog under NSN 4820-01-473-1046. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.