Asco valve | RS UAE

Q: What are common ASCO valve configurations and how do I wire them?

Common configurations and wiring notes include: 2-way normally closed (NC) or normally open (NO) variants, used for simple on/off control of a line. 3-way valves for diverting flow or implementing a bleed path in pneumatic circuits. 4-way valves for controlling double-acting cylinders in actuator applications. Wiring : DC coils are typically wired with a DC supply and may require a diode or suppression device; AC coils may need a transformer and appropriate harnessing. Always follow the manufacturer wiring diagram and ensure proper polarity for DC coils when applicable. Typical installation involves securing the valve to a panel or manifold, connecting the inlet/outlet ports to the correct lines, and wiring the coil to a control relay or PLC output. For reliability, keep wiring tidy, avoid excessive voltage inrush, and protect coils from moisture and dust with gaskets or housings where required.

Default Valve Position

NC (548)

NO (94)

Normally Closed (27)

NO/NC (1)

Minimum Operating Temperature

-10°C (246)

-20°C (169)

-25°C (114)

+5°C (32)

0°C (8)

-196°C (1)

Number of Ports

2 (409)

3 (102)

5/2 (27)

3/2 (10)

5/3 (8)

1 (5)

Servo Assist

No (348)

Yes (70)

Outlet Thread Standard

ISO 228/1 and ISO 7/1 (99)

ISO 228/1 (83)

G (74)

ISO 7.1 (65)

ISO 228/1 & ISO 7/1 (17)

RP (16)

NPT (4)

ISO 228/1 or NPT (3)

G ISO 228/1 (1)

Outlet Port Gender

Female (245)

Male (56)

Inlet Port Gender

Female (210)

Male (89)

Thread Standard

G (175)

ISO (37)

Metric (7)

Valve Type

Angle Seat (156)

Drain (1)

Thread Size 2

3/4in (23)

1in (22)

2in (18)

1/2in (17)

1 1/2in (13)

1 1/4in (13)

2 1/2in (10)

3/8in (8)

1/8in (2)

Product Type

Solenoid Valve (76)

Solenoid Valve Coil (4)

Direct Operated Solenoid Valve (2)

Solenoid Pilot Valve (1)

Minimum Operating Pressure

1.5bar (28)

3.8bar (28)

0bar (8)

2.75bar (7)

2bar (2)

Connection Port Thread

G 1/4 (37)

G 1/8 (22)

Metric M5 (7)

G 1/4, G 1/8 (3)

G 1/4, G 1/8, G 3/8 (1)

Actuation Type

Solenoid/Pilot (18)

Pilot/Pilot (13)

Electro-Pneumatic (12)

Pilot/Spring (3)

Pneumatic (3)

Pilot (1)

Solenoid/Air (1)

Solenoid/Spring (1)

Mounting Style

Manifold (33)

Through Hole (15)

NAMUR (2)

Sub Base (2)

Threaded Connections

G 1/2 (29)

G 1/4 (4)

G 3/8 (2)

G 1/8 (1)

Tube Connections

G 1/2in (28)

G 1/4in (2)

G 3/8in (2)

G 1in (1)

G 3/4in (1)

Maximum Flow Rate

860L/min (10)

175L/min (7)

600L/min (5)

10L/min (2)

760L/min (2)

1050L/min (1)

400L/min (1)

70L/min (1)

Solenoid Power Consumption

2VA (15)

1.6W (12)

3.5 (Hold) VA, 6 (Inrush) VA (2)

Solenoid Voltage

24V dc (11)

230V ac (10)

24V ac (7)

115V ac (1)

For Use With

Solenoid valve (17)

Solenoid Valves (6)

881307 (1)

Proportional solenoid valve (1)

Select quantity

EMERSON ? ASCO EMERSON – ASCO Direct Operated Solenoid Valve 8263H240LT

RS Stock No. 014-7189

Brand EMERSON ? ASCO

Category: Solenoid Valves
Category Link: https://ae.rsdelivers.com/browse/mechanical-fluid-power-tools/plumbing-pipeline/valves-taps/solenoid-valves
Section: Plumbing & Pipeline

AED 3.811.45

in stock now

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EMERSON ? ASCO EMERSON – ASCO 24 V ac Solenoid Valve Coil

RS Stock No. 278-4479

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
Supply Voltage: 24 V ac

AED 142.61

in stock now

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EMERSON ? ASCO EMERSON – ASCO 24 V dc Solenoid Valve Coil

RS Stock No. 278-4463

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
Supply Voltage: 24 V dc

AED 142.61

in stock now

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EMERSON ? ASCO EMERSON – ASCO 230 V ac Solenoid Valve Coil

RS Stock No. 278-4485

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
Supply Voltage: 230 V ac

AED 142.61

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

RS Stock No. 250-3909

Brand EMERSON ? ASCO

Category Link: https://ae.rsdelivers.com/browse/mechanical-fluid-power-tools/plumbing-pipeline/valves-taps/pneumatic-actuated-valves
Return Type: Spring
Super Section: Valves & Taps

AED 1.594.10

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

RS Stock No. 250-3910

Brand EMERSON ? ASCO

Return Type: Spring
Section: Plumbing & Pipeline
Thread Standard: ISO

AED 1.207.90

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

RS Stock No. 250-3912

Brand EMERSON ? ASCO

Category Link: https://ae.rsdelivers.com/browse/mechanical-fluid-power-tools/plumbing-pipeline/valves-taps/pneumatic-actuated-valves
Section: Plumbing & Pipeline
Valve Type: Angle Seat

AED 1.822.65

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 2in

RS Stock No. 250-3916

Brand EMERSON ? ASCO

Category: Pneumatic Actuated Valves
Thread Standard: ISO
Valve Type: Angle Seat

AED 2.346.17

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 189 115/120 V Solenoid Valve Coil

RS Stock No. 255-3016

Brand EMERSON ? ASCO

For Use With: Solenoid Valves
Series: 189
Supply Voltage: 115/120 V

AED 142.61

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

RS Stock No. 656-3197

Brand EMERSON ? ASCO

For Use With: Solenoid valve
Series: 238
Supply Voltage: 230 V ac

AED 171.27

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 24 V dc Solenoid Valve Coil

RS Stock No. 656-3210

Brand EMERSON ? ASCO

Category: Solenoid Coils for Process Valves
For Use With: Solenoid valve
Supply Voltage: 24 V dc

AED 171.27

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 24 V ac Solenoid Valve Coil

RS Stock No. 656-3456

Brand EMERSON ? ASCO

Category: Solenoid Coils for Process Valves
Series: 238
Supply Voltage: 24 V ac

AED 171.27

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

RS Stock No. 250-3911

Brand EMERSON ? ASCO

Return Type: Spring
Super Section: Valves & Taps
Thread Size: 1in

AED 1.822.65

in stock now

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EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1/2in

RS Stock No. 250-3917

Brand EMERSON ? ASCO

Category Link: https://ae.rsdelivers.com/browse/mechanical-fluid-power-tools/plumbing-pipeline/valves-taps/pneumatic-actuated-valves
Section: Plumbing & Pipeline
Thread Size: 1/2in

AED 964.30

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 356 12 V Solenoid Valve Coil

RS Stock No. 255-3010

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
For Use With: Solenoid Valves
Series: 356

AED 249.55

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 353 24 V Solenoid Valve Coil

RS Stock No. 255-3013

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
For Use With: Solenoid valve
Series: 353

AED 153.41

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

RS Stock No. 257-7225

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
For Use With: Solenoid valve
Supply Voltage: 24 V

AED 153.41

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

RS Stock No. 257-7226

Brand EMERSON ? ASCO

For Use With: Solenoid valve
Series: 108
Supply Voltage: 24 V

AED 153.41

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 272/374 230 V Solenoid Valve Coil

RS Stock No. 656-3226

Brand EMERSON ? ASCO

For Use With: Solenoid valve
Series: 272/374
Supply Voltage: 230 V

AED 198.67

in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 24 V Solenoid Valve Coil

RS Stock No. 255-3008

Brand EMERSON ? ASCO

For Use With: Solenoid Valves
Series: 108, 109, 189
Supply Voltage: 24 V

AED 153.41

in stock now

Select quantity

EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 230 V Solenoid Valve Coil

RS Stock No. 255-3009

Brand EMERSON ? ASCO

Category: Solenoid Valve Coils
For Use With: Solenoid valve
Supply Voltage: 230 V

AED 153.41

in stock now

Select quantity

EMERSON ? ASCO EMERSON – ASCO Series 238, 256, 356 115/120 V Solenoid Valve Coil

RS Stock No. 255-3012

Brand EMERSON ? ASCO

For Use With: Solenoid Valves
Super Section: Valves & Taps
Supply Voltage: 115/120 V

AED 153.41

in stock now

Select quantity

EMERSON ? ASCO EMERSON – ASCO Series 210, 215, 220, 370, 551 48 V Solenoid Valve Coil

RS Stock No. 255-3014

Brand EMERSON ? ASCO

Category Link: https://ae.rsdelivers.com/browse/mechanical-fluid-power-tools/plumbing-pipeline/valves-taps/solenoid-valve-coils
Section: Plumbing & Pipeline
Super Section: Valves & Taps

AED 198.67

in stock now

Select quantity

EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V dc Solenoid Valve Coil

RS Stock No. 656-3248

Brand EMERSON ? ASCO

Category: Solenoid Coils for Process Valves
For Use With: Solenoid valve
Supply Voltage: 24 V dc

AED 153.41

in stock now

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What is an ASCO valve?

An ASCO valve is a family of solenoid valves and air-operated valves manufactured by ASCO (now part of Emerson). These valves are designed to control the flow of compressed air or liquids in automation and process systems. A typical ASCO valve uses an electric coil to move a plunger or diaphragm, opening or closing a flow path inside a rugged body. They are known for reliability, fast response times, and long service life in industrial environments, making them a common choice for pneumatic control, irrigation, beverage dispensing, and machinery automation.

What types of ASCO valves are available and how do I choose between them?

ASCO offers a range of valve types to suit different control strategies and media. The most common categories are:

2-way valves (single port, on/off control of flow) for straightforward shutoff or isolation tasks.
3-way valves (one inlet and two outlets) for diverting flow or using a pilot-operated arrangement.
4-way valves (two inlets and two outlets) for actuating double-acting cylinders in pneumatic systems.
Direct-acting vs Pilot-operated designs, chosen based on system pressure and response requirements.
AC coil vs DC coil versions, offering different voltages and power profiles for compatibility with control cabinets and field wiring.
Materials and configurations including brass bodies, stainless steel, and plastic/resin bodies, with various seal materials (NBR, EPDM, FKM) for media compatibility.

When selecting, consider media (air, water, chemical compatibility), operating pressure (low to high), temperature, coil voltage, duty cycle, port size (for example 1/8", 1/4", 1/2" NPT or BSP), and environmental protection (IP ratings). RS Components carries a broad range of ASCO valves to cover common industrial needs, ensuring you can pair the valve with the right coil and body material.

How do I choose the right valve for my application (media, pressure, temperature, and wiring)?

Selecting the correct ASCO valve involves matching several key specifications to your system requirements. Consider:

Media compatibility: ensure the seal and body material are compatible with air, water, oils, or chemicals in your circuit. Seals may be NBR, EPDM, or FKM depending on the medium.
Pressure and flow: verify the valve’s maximum inlet pressure and Cv (flow coefficient) to guarantee adequate performance at your operating point.
Temperature: confirm the valve can withstand the ambient and media temperature without degradation of seals or plastic components.
Coil voltage and power: choose AC or DC coils in standard volts (e.g., 12 VDC, 24 VDC, 24 VAC, 110 VAC) and review coil resistance and energy consumption for control panel sizing.
Port size and thread: select the correct port threads (NPT, BSP, metric) and size (1/8", 1/4", 1/2" are common) to fit your plumbing.
Environment and IP rating: rugged industrial environments may require IP65/67 ratings and robust housings.

If in doubt, start with a general-purpose 2-way or 3-way valve in a standard coil voltage, then determine if a pilot-operated variant offers reduced energy use or improved performance at your operating pressure.

What are common ASCO valve configurations and how do I wire them?

Common configurations and wiring notes include:

2-way normally closed (NC) or normally open (NO) variants, used for simple on/off control of a line.
3-way valves for diverting flow or implementing a bleed path in pneumatic circuits.
4-way valves for controlling double-acting cylinders in actuator applications.
Wiring: DC coils are typically wired with a DC supply and may require a diode or suppression device; AC coils may need a transformer and appropriate harnessing. Always follow the manufacturer wiring diagram and ensure proper polarity for DC coils when applicable.

Typical installation involves securing the valve to a panel or manifold, connecting the inlet/outlet ports to the correct lines, and wiring the coil to a control relay or PLC output. For reliability, keep wiring tidy, avoid excessive voltage inrush, and protect coils from moisture and dust with gaskets or housings where required.

What are typical applications for ASCO valves?

ASCO valves are used across many sectors to precisely control flow and pressure. Typical applications include:

Pneumatic system control in packaging, automation, and material handling
HVAC and climate control for zone isolation and actuator functions
Water treatment, irrigation, and beverage equipment where clean, reliable shutoff is required
Medical devices and laboratory instrumentation requiring rapid, repeatable valve operation
Industrial machinery, robotics, and OEM equipment for precise actuation

When integrating with RS Components’ catalog, you’ll find ASCO valves offered in configurations optimized for quick integration into standard assemblies, with documentation and compatibility information for easy procurement and replacement.

How do I maintain ASCO valves and troubleshoot common issues?

Routine maintenance helps maximize life and reliability. Common checks include:

Inspect power supply and confirm the coil is energizing correctly; a buzzing or no-click may indicate coil or wiring issues.
Check for leaks at seals, body joints, and port connections; replace seals if worn or degraded.
Ensure clean media and proper filtration to prevent fouling of internal components.
Test the valve’s response time and verify that pilot-operated variants operate as expected under system pressure.
For DC coils, measure resistance to detect winding faults; for AC coils, verify correct voltage and absence of overheating.

If corrosion or heavy fouling is present, disassembly and thorough cleaning or coil replacement may be required. Always follow safety procedures when servicing valves on live systems.

Why purchase ASCO valves from RS Components?

RS Components offers genuine ASCO valves with broad coverage of sizes, materials, and coil options to fit many automation designs. Benefits include:

Extensive product range with datasheets, technical support, and compatibility notes
Access to official ASCO parts and cross-references for quick replacements
Fast shipping, global availability, and clear pricing for project planning
Documentation for safety, installation, and maintenance to help ensure compliance

Whether you need a 2-way brass-bodied valve with 24 VDC coil or a stainless steel 4-way valve with 110 VAC coil, RS Components can help you find the right ASCO valve for your application and integrate it into your control system efficiently.

What should I consider for compatibility with existing systems and accessories?

Consider accessory compatibility to optimize performance and ease of maintenance:

Manifolds and brackets for rapid installation and modular control
Connectors and wiring harnesses to match coil voltage and color coding
Filters and regulators to protect valves from contaminants and regulate supply pressure
Seal kits and replacement parts for long-term serviceability
Thread adapters (NPT, BSP, metric) to fit existing piping

Confirm the thermal and electrical ratings align with your control cabinet, and select valves with documentation that matches your safety and maintenance standards.

Floating valve Air release valve Pressure regulating valve Thermostatic valve 3 way valve Smc pressure booster Measuring tape 3m 250V dc Multilayer Organic Capacitors Abb timer relays Molex 34675

"Asco valve"

EMERSON ? ASCO EMERSON – ASCO Direct Operated Solenoid Valve 8263H240LT

EMERSON ? ASCO EMERSON – ASCO 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 2in

EMERSON ? ASCO EMERSON – ASCO Series 189 115/120 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1in

EMERSON ? ASCO EMERSON – ASCO Angle Seat type Pneumatic Actuated Valve, ISO 1/2in

EMERSON ? ASCO EMERSON – ASCO Series 356 12 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 353 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 272/374 230 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 230 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238, 256, 356 115/120 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 210, 215, 220, 370, 551 48 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V dc Solenoid Valve Coil

What is an ASCO valve?

What types of ASCO valves are available and how do I choose between them?

How do I choose the right valve for my application (media, pressure, temperature, and wiring)?

What are common ASCO valve configurations and how do I wire them?

What are typical applications for ASCO valves?

How do I maintain ASCO valves and troubleshoot common issues?

Why purchase ASCO valves from RS Components?

What should I consider for compatibility with existing systems and accessories?