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98558B1 — POWER ASSEMBLY,THERMOSTATIC,VALV

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

98558B1: POWER ASSEMBLY,THERMOSTATIC,VALV.

POWER ASSEMBLY,THERMOSTATIC,VALV. Key specifications include general_characteristics_item_description: BULB 1.250 IN. DIA,RANGE 70.0 DEG F TO 110.0 DEG F,BULB 20 IN.

LG,1.750-18 NS 2A THD BULB CONNECTION A. This part is cataloged in the U.S. Government catalog under NSN 4820-00-021-3658, 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
98558B1
NSN: 4820-00-021-3658
FSC: 4820 — Valves, Nonpowered
CAGE: 73475 — SCHNEIDER ELECTRIC SYSTEMS USA INC (USA)
SPECIFICATIONS
general_characteristics_item_descriptionBULB 1.250 IN. DIA,RANGE 70.0 DEG F TO 110.0 DEG F,BULB 20 IN. LG,1.750-18 NS 2A THD BULB CONNECTION A
NSN4820-00-021-3658
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 98558B1 · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: BULB 1.250 IN. DIA,RANGE 70.0 DEG F TO 110.0 DEG F,BULB 20 IN. LG,1.750-18 NS 2A THD BULB CONNECTION A
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONBULB 1.250 IN. DIA,RANGE 70.0 DEG F TO 110.0 DEG F,BULB 20 IN. LG,1.750-18 NS 2A THD BULB CONNECTION A
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
JDW4133-85Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 98558B1?
98558B1 is a POWER ASSEMBLY,THERMOSTATIC,VALV.
What parts can replace 98558B1?
There is 1 known substitute for 98558B1: JDW4133-85. Substitute compatibility should be verified for your specific system.
What is the NSN for 98558B1?
98558B1 is cataloged in the U.S. Government catalog under NSN 4820-00-021-3658. 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.