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1H337 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

1H337: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, connection_type: UNTHREADED EXTERNAL PIPE FIRST END, connection_style: PLAIN (PIPE) FIRST END, style_designator: STRAIGHT THRU, flow_control_device: POPPET, valve_operation_method: AUTOMATIC. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-981-1017, 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
1H337
NSN: 4820-00-981-1017
FSC: 4820 — Valves, Nonpowered
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
connection_typeUNTHREADED EXTERNAL PIPE FIRST END
connection_stylePLAIN (PIPE) FIRST END
style_designatorSTRAIGHT THRU
flow_control_devicePOPPET
valve_operation_methodAUTOMATIC
nominal_pipe_size_accommodated0.625 INCHES FIRST END IN
NSN4820-00-981-1017
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1H337 · 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
•
FLOW CONTROL DEVICE: POPPET
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.625 INCHES FIRST END IN
•
CONNECTION STYLE: PLAIN (PIPE) FIRST END
•
CONNECTION TYPE: UNTHREADED EXTERNAL PIPE FIRST END
•
STYLE DESIGNATOR: STRAIGHT THRU
•
MATERIAL: STEEL OVERALL
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
NOMINAL PIPE SIZE ACCOMMODATED0.625 INCHES FIRST END IN
CONNECTION STYLEPLAIN (PIPE) FIRST END
CONNECTION TYPEUNTHREADED EXTERNAL PIPE FIRST END
STYLE DESIGNATORSTRAIGHT THRU
MATERIALSTEEL OVERALL
VALVE OPERATION METHODAUTOMATIC
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 1H337?
1H337 is a VALVE,SAFETY RELIEF.
What is the NSN for 1H337?
1H337 is cataloged in the U.S. Government catalog under NSN 4820-00-981-1017. 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.