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20138R51SS — Technical Data Sheet

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— · 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 VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING STEM, duty_cycle: CONTINUOUS, point_type: SPLIT, valve_size: 0.500 INCHES IN, bonnet_type: INSIDE SPRING, point_angle: 135.0 DEGREES NOMINAL. This part is cataloged in the Federal Logistics Information System under NSN 4820-01-071-8814, 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
20138R51SS
NSN: 4820-01-071-8814
FSC: 4820
CAGE: 15187 — EMERSON AUTOMATION SOLUTIONS FINAL CONTROL US LP DIV NAVY PRODUCT TEAM (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING STEM
duty_cycleCONTINUOUS
point_typeSPLIT
valve_size0.500 INCHES IN
bonnet_typeINSIDE SPRING
point_angle135.0 DEGREES NOMINAL
shank_styleSTRAIGHT ROUND
temp_rating90.0 AMBIENT CELSIUS
current_typeAC INPUT
flange_shapeROUND WITH HOLES ALL ENDS
flute_length2.437 INCHES NOMINAL IN
overall_width53.000 INCHES IN
NSN4820-01-071-8814
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 20138R51SS · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
10099InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
940 1-19/32InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
20138InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
49724InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
R51InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
15124InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20138R51SS?
20138R51SS is a VALVE,SAFETY RELIEF.
What parts can replace 20138R51SS?
There are 18 known substitutes for 20138R51SS: 10099, 940 1-19/32, 20138 and 15 more. Substitute compatibility should be verified for your specific system.
Is 20138R51SS still available?
20138R51SS is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026