American ASCO solenoid valve WSNF8551A421MO

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Product Overview

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ASCO WSNF8551A421MO belongs to the ASCO 551 (8551) series under Emerson, and is a pilot operated two position five way explosion-proof wet sealed normally closed solenoid valve. It is a special control component for pneumatic circuits in hazardous chemical conditions and is produced by ASCO in the United States. Our company has a significant advantage over the ASCO product WSNF8551A421MO.

WSNF8551A421MO model code disassembly

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WSNF: Wet Sealed Normal Fail abbreviation, wet sealed normally closed explosion-proof electromagnetic head, coil shell stainless steel protection, with explosion-proof structure, moisture-proof and dustproof, wet sealed design to prevent medium from infiltrating the coil chamber;
8551: Basic series code=551 series, valve body is a two position five way (5-port 2-position) slide valve structure, NPT1/4 standard threaded interface, and the valve body is equipped with aluminum alloy material as standard;
A421: Valve body configuration code, A represents aluminum alloy valve body, 421 defines interface specification 1/4 “NPT internal thread, explosion-proof rating and coil electrical reference parameters, matched with explosion-proof certification standards;
MO: Manual Override abbreviation, comes with a manual emergency button, which can manually force the valve to open and close in the event of power failure, meeting equipment maintenance and emergency start stop needs.

physical image

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Standard technical parameters

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Parameter Item	Technical Specification
Valve Structure	Pilot-operated 5/2 way, spring return normally closed (NC)
Applicable Medium	Dry compressed air and various inert gases (Not applicable for liquid or high-viscosity media)
Operating Air Pressure	0.2~1.0MPa (2~10bar)
Port Size	1/4″ NPT female thread (DN8)
Valve Body Material	Hard anodized aluminum
Medium Operating Temperature	-25℃～+60℃
Ambient Temperature	-40℃～+75℃
Coil Power	Standard: 9~11.2W / Low power: 1.5W
Explosion-proof Certifications	ATEX, IECEx, CSA, UL, NEPSI
Ingress Protection	IP66/IP67
Cv Flow Coefficient	0.87
Seal Material	Low-temperature resistant FKM fluoroelastomer

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