PartsTable
Technical Data Sheet

D-30-C/156TO186PSI — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

D-30-C/156TO186PSI: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING STEM, flange_shape: ROUND WITH HOLES ALL ENDS, connection_type: FLANGE ALL ENDS, style_designator: ANGLE FLANGED ENDS, nominal_thickness: 0.625 INCHES ALL ENDS IN, bolt_hole_quantity: 4 ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-540-8335, 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
D-30-C/156TO186PSI
NSN: 4820-01-540-8335
FSC: 4820 — Valves, Nonpowered
CAGE: 0FCV0 — KEYSTONE INTL INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING STEM
flange_shapeROUND WITH HOLES ALL ENDS
connection_typeFLANGE ALL ENDS
style_designatorANGLE FLANGED ENDS
nominal_thickness0.625 INCHES ALL ENDS IN
bolt_hole_quantity4 ALL ENDS
disk_loading_methodSPRING
valve_operation_methodAUTOMATIC OR MANUAL
end_item_identificationREACTOR BOUNDRY AREA
nominal_outside_diameter4.875 INCHES ALL ENDS IN
adjustable_pressure_range+156.0 TO 186.0 POUNDS PER SQUARE INCH LBS
bolt_hole_nominal_diameter0.625 INCHES ALL ENDS IN
NSN4820-01-540-8335
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: D-30-C/156TO186PSI · 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
•
FLANGE SHAPE: ROUND WITH HOLES ALL ENDS
•
FURNISHED ITEMS AND QUANTITY: 1 LEVER
•
BOLT CIRCLE NOMINAL DIAMETER: 2.625 INCHES ALL ENDS IN
•
CONNECTION TYPE: FLANGE ALL ENDS
•
STYLE DESIGNATOR: ANGLE FLANGED ENDS
•
BOLT HOLE NOMINAL DIAMETER: 0.625 INCHES ALL ENDS IN
•
ADJUSTABLE PRESSURE RANGE: +156.0 TO 186.0 POUNDS PER SQUARE INCH LBS
•
NOMINAL OUTSIDE DIAMETER: 4.875 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FLANGE SHAPEROUND WITH HOLES ALL ENDS
FURNISHED ITEMS AND QUANTITY1 LEVER
BOLT CIRCLE NOMINAL DIAMETER2.625 INCHES ALL ENDS IN
CONNECTION TYPEFLANGE ALL ENDS
STYLE DESIGNATORANGLE FLANGED ENDS
BOLT HOLE NOMINAL DIAMETER0.625 INCHES ALL ENDS IN
ADJUSTABLE PRESSURE RANGE+156.0 TO 186.0 POUNDS PER SQUARE INCH LBS
NOMINAL OUTSIDE DIAMETER4.875 INCHES ALL ENDS IN
DISK LOADING METHODSPRING
BOLT HOLE QUANTITY4 ALL ENDS
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 1
NMP-1531/D-30-C156TO186PSIReference document
Same NSN cross-reference
Reference document — Secondary reference
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 D-30-C/156TO186PSI?
D-30-C/156TO186PSI is a VALVE,SAFETY RELIEF.
What parts can replace D-30-C/156TO186PSI?
There is 1 known substitute for D-30-C/156TO186PSI: NMP-1531/D-30-C156TO186PSI. Substitute compatibility should be verified for your specific system.
What is the NSN for D-30-C/156TO186PSI?
D-30-C/156TO186PSI is cataloged in the U.S. Government catalog under NSN 4820-01-540-8335. 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.