E521 — VALVE,SAFETY RELIEF

✓ Government record, cited

— · GATE VALVE

PRODUCT OVERVIEW

E521: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY SEAT, valve_size: 2.000 INCHES IN, flange_shape: ROUND WITH HOLES ALL ENDS, connection_type: FLANGE ALL ENDS, style_designator: ANGLE FLANGED ENDS, nominal_thickness: 0.438 INCHES ALL ENDS IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-289-2009, 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

E521

NSN: 4820-00-289-2009
FSC: 4820 — Valves, Nonpowered
CAGE: 75954 — KUNKLE INDUSTRIES INC LONERGAN VALVE DIV (USA)

SPECIFICATIONS

material	COPPER ALLOY SEAT
valve_size	2.000 INCHES IN
flange_shape	ROUND WITH HOLES ALL ENDS
connection_type	FLANGE ALL ENDS
style_designator	ANGLE FLANGED ENDS
nominal_thickness	0.438 INCHES ALL ENDS IN
bolt_hole_quantity	6 ALL ENDS
flange_face_design	PLAIN ALL ENDS
operating_pressure	100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
disk_loading_method	SPRING
flow_control_device	DISK
maximum_operating_temp	425.0 FAHRENHEIT SINGLE RESPONSE DEGF
NSN	4820-00-289-2009

COMPONENT DIAGRAM

KEY FEATURES

•

FLOW CONTROL DEVICE: DISK

•

FLANGE SHAPE: ROUND WITH HOLES ALL ENDS

•

FLANGE FACE DESIGN: PLAIN ALL ENDS

•

BOLT CIRCLE NOMINAL DIAMETER: 4.438 INCHES ALL ENDS IN

•

CONNECTION TYPE: FLANGE ALL ENDS

•

STYLE DESIGNATOR: ANGLE FLANGED ENDS

•

BOLT HOLE NOMINAL DIAMETER: 0.562 INCHES ALL ENDS IN

•

OPERATING PRESSURE: 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS

TECHNICAL CHARACTERISTICS

FLOW CONTROL DEVICE	DISK
FLANGE SHAPE	ROUND WITH HOLES ALL ENDS
FLANGE FACE DESIGN	PLAIN ALL ENDS
BOLT CIRCLE NOMINAL DIAMETER	4.438 INCHES ALL ENDS IN
CONNECTION TYPE	FLANGE ALL ENDS
STYLE DESIGNATOR	ANGLE FLANGED ENDS
BOLT HOLE NOMINAL DIAMETER	0.562 INCHES ALL ENDS IN
OPERATING PRESSURE	100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VALVE SIZE	2.000 INCHES IN
ADJUSTABLE PRESSURE RANGE	+18.0 TO 32.0 POUNDS PER SQUARE INCH LBS

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 2

L2210C2INReference document

Same NSN cross-reference

Reference document — Secondary reference

25J926Reference 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 E521?

E521 is a VALVE,SAFETY RELIEF.

What parts can replace E521?

There are 2 known substitutes for E521: L2210C2IN, 25J926. Substitute compatibility should be verified for your specific system.

What is the NSN for E521?

E521 is cataloged in the U.S. Government catalog under NSN 4820-00-289-2009. This indicates validated use in U.S. government and defense supply chains.

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