ASCO 8210 Series General Service Solenoid Valve
Overview
The ASCO 8210 Series is a pilot-operated, general-service 2-way solenoid valve engineered by ASCO — the original inventor of the solenoid valve in 1910 and now part of Emerson’s Discrete Automation portfolio. Offered in brass or stainless steel bodies from 3/8″ to 2 1/2″ NPT, the ASCO 8210 delivers high flow capacity, low internal leakage, and long service life across air, inert gas, water, and light oil applications. Its pilot-operated diaphragm and piston constructions make it one of the most widely specified general-purpose solenoid valves in industrial and commercial fluid control, trusted for decades in car wash systems, laundry equipment, air compressors, and industrial water control.
With engineering support in Muscat, Seven Star LLC supplies the ASCO 8210 Series solenoid valve to process plants, utilities, and manufacturing facilities across Oman and the wider GCC. Buyers in Muscat, Sohar, and Salalah can source Emerson ASCO valves through Seven Star LLC with full manufacturer documentation and UL and CSA-listed construction.
Operating Principle
The ASCO 8210 Series uses pilot-operated diaphragm or piston construction, meaning a small internal pilot orifice is opened first by the solenoid coil, using the line pressure itself to lift the main diaphragm or piston off its seat. This design allows the valve to control high flow rates through a comparatively compact and low-power solenoid, since the coil only needs to actuate the small pilot element rather than the full-bore main disc directly. Once the pilot path opens, differential pressure across the diaphragm does the mechanical work of opening the main flow path, and closing occurs when the coil de-energizes and the pilot reseats, allowing pressure to re-equalize and the main disc to reseat under spring and pressure force.
This pilot-operated principle has direct implications for system design: the valve requires a minimum operating pressure differential to function correctly (typically a few psi, per the specification table), so it is not suited to zero-differential or vacuum applications the way a direct-acting valve would be. In exchange, the ASCO 8210 achieves substantially higher flow coefficients (Cv values from roughly 1.5 up to 45 depending on pipe and orifice size) at moderate power consumption, making it the practical choice wherever high flow, general-service reliability, and cost-effective coil sizing all matter simultaneously.
Engineering Design of the ASCO 8210 Series
Every ASCO 8210 Series valve shipped by Seven Star LLC is genuine Emerson factory stock. Mechanically, the ASCO 8210 Series is constructed with brass or 304/316L stainless steel bodies, NBR or PTFE seats and discs, a 305 stainless steel core tube, and 430F stainless steel core and plugnut components, giving the valve robust corrosion resistance and long cycle life in continuous industrial duty. The valve is available in normally closed and normally open configurations across pipe sizes from 3/8″ to 2 1/2″ NPT, with orifice sizes matched to each pipe size to optimize flow while maintaining tight shut-off. Standard coil classes are rated Class F or Class H insulation, with watt ratings from roughly 6 to 41 watts depending on voltage and construction, supporting standard voltages of 24, 120, 240, and 480 V AC or 6, 12, 24, 120, and 240 V DC.
Solenoid enclosures on the ASCO 8210 are available as standard watertight NEMA Type 1/2/3/3S/4/4X construction, with optional explosion-proof and watertight enclosures rated NEMA 3, 3S, 4, 4X, 6, 6P, 7, and 9 for hazardous-area installations, plus ATEX and IECEx-certified variants carrying the “EV” prefix. This range of enclosure options allows the same core valve platform to be specified for anything from a simple utility water line to a Zone 1 hazardous process area, simplifying spares standardization for plants running mixed classification zones.
Key Features
The ASCO 8210 Series combines high flow capacity, broad media compatibility, and flexible hazardous-area options into a single valve platform. Its principal features include:
- Pilot-operated diaphragm and piston construction delivering high flow capacity with compact coil sizing.
- Brass or 304/316L stainless steel bodies for compatibility with air, inert gas, water, and light oil service.
- NBR or PTFE seat and disc options selectable for chemical compatibility with the process medium.
- Pipe sizes from 3/8″ to 2 1/2″ NPT with orifice-matched Cv ratings up to approximately 45.
- UL-listed and CSA-certified construction, with ATEX/IECEx-certified variants available under the “EV” prefix.
- Optional explosion-proof and watertight enclosures rated NEMA 3, 4, 4X, 7, and 9 for hazardous-area service.
- Normally closed and normally open configurations covering the majority of general fluid control applications.
- Standard AC and DC voltage options from 6 V DC to 480 V AC for straightforward integration with existing control panels.
Industrial Applications
The ASCO 8210 Series solenoid valve is specified across a wide range of general industrial and commercial fluid control duties, from compressed air and inert gas isolation in manufacturing plants to water control in car wash systems, laundry equipment, and industrial washdown lines. Its high flow capacity and pilot-operated reliability also make it a common choice for air compressor unloading circuits, pump priming systems, and general process water distribution where dependable, long-service-life valve performance is essential to uptime.
Backed by genuine manufacturer documentation, Seven Star LLC distributes the ASCO 8210 Series to industrial facilities, utilities, and process plants throughout Oman and the GCC, including installations in the Sohar and Salalah economic zones where dependable general-service fluid control is critical to continuous plant operation. Procurement teams and facility engineers in Muscat and across the Sultanate rely on Seven Star LLC for genuine Emerson ASCO stock backed by full manufacturer traceability and technical support.
Technical Specifications
The table below summarizes representative specifications for a common ASCO 8210 Series configuration (1/2″ NPT, normally closed, brass body).
| Parameter | Specification |
|---|---|
| Model | ASCO 8210 Series (Catalog No. 8210G002) |
| Valve Type | Pilot-operated, general-service 2-way solenoid valve |
| Pipe Size Range | 3/8″ – 2 1/2″ NPT |
| Orifice Size (1/2″ model) | 16 mm (5/8″), Cv 4.00 / Kv 3.46 m³/hr |
| Body Materials | Brass or 304/316L Stainless Steel |
| Seat/Disc Material | NBR or PTFE |
| Max Fluid Temperature | 8210G002: 180 °F (82 °C) with AC coil; 150 °F (66 °C) with 24 V DC coil |
| Operating Pressure Differential | 8210G002 AC coil: 5-200 psi air/inert gas, 5-150 psi water, 5-135 psi light oil; 24 V DC coil: 5-125 psi air/inert gas, 5-100 psi water and light oil |
| Standard Voltages | 24, 120, 240, 480 V AC; 6–240 V DC |
| Coil Rating | 6.1 W AC / 11.6 W DC, Class F insulation |
| Approvals | UL listed, CSA certified; ATEX/IECEx variants available |
| Function | Normally closed (NC), pilot-operated diaphragm |
| Flow Coefficient (8210G002) | Cv 4.00 (Kv 3.46) |
| Ambient Temperature (8210G002) | 32 to 125 °F with AC coil; 32 to 104 °F with 24 V DC coil |
| Seating Elastomer (8210G002) | NBR |
| Coil Class (8210G002) | FT |
| Holding Current (120/60, 110/50 AC coil) | 16 VA |
| Coil Lead Length | 18 in |
| Mounting Direction | Any |
| Weight (8210G002) | 1.90 lb with AC coil; 2.01 lb with 24 V DC coil |
8210G002 Ratings: AC Versus DC Coil
Emerson publishes separate ratings for the 1/2 in NPT brass 8210G002 depending on the coil. With the 120/60, 110/50 AC coil the valve is rated for an operating pressure differential of 5 to 200 psi on air and inert gas, 5 to 150 psi on water and 5 to 135 psi on light oil, with fluid temperature from 32 to 180 °F and ambient temperature from 32 to 125 °F. The AC coil is listed at 6.1 W with a 16 VA holding current and coil class FT.
With the 24 V DC coil the same valve is rated lower: 5 to 125 psi on air and inert gas and 5 to 100 psi on water or light oil, with fluid temperature limited to 32 to 150 °F and ambient temperature to 32 to 104 °F. The DC coil is listed at 11.6 W. Flow capacity is the same in both cases, Cv 4.00 (Kv 3.46) through a 5/8 in orifice. Because every rating starts at 5 psi, the line must always provide at least that differential for the valve to operate.
How 8210G002 Voltage Versions Are Listed
Emerson lists the 8210G002 as a family of complete valves that differ only in coil voltage. The AC versions shown on the manufacturer's product page include 24/60, 110/50, 120/60, 220/50, 220/60, 240/60 and 480/60, plus dual-frequency coils marked 120/60,110/50, 240/60,220/50 and 480/60,440/50. A 24 V DC version is also listed. When requesting a quotation, state the catalog number together with the exact voltage and frequency, because the pressure and temperature ratings of the DC valve differ from those of the AC valve. Listed media are air, inert gas, water and light oil.
ASCO 8210 Series – Frequently Asked Questions
How does the ASCO 8210 work?
It is pilot-operated: the coil opens a small pilot orifice and line pressure lifts the main diaphragm or piston, so a compact low-power coil controls a high flow.
Can it be used at zero pressure differential?
No. It needs a minimum operating pressure differential, so it is not suited to zero-differential or vacuum service.
Which media is it suitable for?
Air, inert gas, water and light oil.
What body materials are available?
Brass or 304/316L stainless steel, with NBR or PTFE seats and discs.
Where can I buy ASCO 8210 valves in Oman?
Seven Star LLC supplies genuine Emerson ASCO 8210 valves across Muscat, Sohar and Salalah. Request a quote below for price and lead time.
Request a Quote for ASCO 8210 Series General Service Solenoid Valve
Seven Star LLC is ready to support your fluid control project with genuine ASCO 8210 Series solenoid valves, full manufacturer datasheets, and application engineering guidance — contact us to order the ASCO 8210 Series with confidence. Reach out to our instrumentation division to request a formal quotation, confirm current availability and lead time, or discuss enclosure and voltage selection for your specific installation. Working closely with plant engineers in the region, Seven Star LLC guarantees genuine Emerson-manufactured product, complete documentation, and responsive local support for every order.
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ASCO solenoid valve series listed here
Three series are listed. The ASCO 8210 series is a two-way, pilot-operated general service valve for air, water and light oil. The ASCO 327 series is a direct-operated three-way valve widely used to pilot the actuators of process valves, including shutdown valves. The ASCO 551 series is a pilot-operated spool valve with a NAMUR interface that mounts directly on quarter-turn pneumatic actuators.Ordering ASCO valves: what we need
Send the complete catalog number from the nameplate, including prefix and suffix letters, since these define the solenoid enclosure, coil and seal options. Add the coil voltage and frequency, pipe size and thread, body material, the fluid, the minimum and maximum operating pressure differential, and whether the valve is normally closed, normally open or universal. For hazardous areas, state the protection type required. Buyers in the GCC often add ambient temperature, which affects coil selection.Browse ASCO products by category: Solenoid Valve.
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