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Home /Products/Valve Accessories/ASCO 551 Series 5 2 Way Pneumatic Solenoid Spool Valve Rotary Actuator Control Industrial Automation Systems

ASCO 551 Series 5 2 Way Pneumatic Solenoid Spool Valve Rotary Actuator Control Industrial Automation Systems

1
MOQ
USD 70-125 per set
Price
ASCO 551 Series 5 2 Way Pneumatic Solenoid Spool Valve Rotary Actuator Control Industrial Automation Systems
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Features
Specifications
Basic Infomation
Place of Origin: China
Brand Name: ASCO
Model Number: 8327
Payment & Shipping Terms
Packaging Details: Carton/Wooden Case Packaging
Delivery Time: 6-8 weeks
Payment Terms: T/T
Supply Ability: 800 sets per year
Product Description
ASCO 551 Series 5 2 Way Pneumatic Solenoid Spool Valve Rotary Actuator Control Industrial Automation Systems
Product Overview

The ASCO Series 551 is a high-performance line of compact solenoid spool valves designed for the pilot control of pneumatic actuators. Featuring a unique NAMUR interface, these valves are industry standards for reliability and durability in harsh environments. Whether used for single-acting or double-acting actuators, the 551 series provides bubble-tight shutoff and exceptional resistance to dirt and moisture, ensuring long-term operational stability for industrial automation.

Features
  • NAMUR Interface: Direct mounting to pneumatic actuators without extra piping.
  • Convertible Function: Easily switch between 3/2 and 5/2 functions with a single flow plate.
  • Bubble-Tight Shutoff: Unique T-seal and O-ring design ensures zero leakage.
  • Corrosion Resistance: High-quality aluminum or stainless steel body options.
  • Low Power Consumption: Energy-efficient coil designs suitable for continuous duty.
  • Environmental Protection: Available with ATEX/IECEx explosion-proof certifications for hazardous areas.
  • Long Cycle Life: Engineered for millions of cycles under demanding conditions.
Technical Specifications
Attribute Specification
Body Material Anodized Aluminum / 316L Stainless Steel
Port Size 1/4" G or NPT
Function 3/2 NC or 5/2 Convertible
Operating Pressure 2 to 10 Bar (29 to 145 PSI)
Flow Rate (Cv) 0.86 (Standard)
Voltage Options 24VDC, 110VAC, 230VAC (50/60Hz)
Temperature Range -25°C to +60°C (Standard) / -60°C (Arctic version)
Coil Insulation Class H / IP65 Waterproof
Applications
  • Oil and Gas: Control of refinery and pipeline valves.
  • Chemical Processing: Handling corrosive environments and explosive atmospheres.
  • Water Treatment: Automated flow control in filtration and treatment plants.
  • Food and Beverage: Precision control in hygienic automation lines.
  • Power Generation: Reliable pilot control for steam and gas plant actuators.
Frequently Asked Questions
Q: Can I use this valve for both single-acting and double-acting actuators?
A: Yes, the 551 series features a unique flow plate that allows you to convert the valve between 3/2 (single-acting) and 5/2 (double-acting) functions quickly.
Q: Does it come with explosion-proof certifications?
A: Absolutely. We offer various coil options including Ex d (Flameproof), Ex mb (Encapsulated), and Ex ia (Intrinsically Safe) to meet global safety standards.
Q: Is the NAMUR mounting hardware included?
A: Standard packages include the necessary mounting screws and seals for direct attachment to NAMUR actuators.
Related Products
  • ASCO 553 Series: High-flow version with 1/2" port size.
  • Solenoid Replacement Coils: Various voltages and power ratings available.
  • Pneumatic Rotary Actuators: Rack and pinion or scotch yoke designs.
  • Limit Switch Boxes: Mechanical or inductive sensors for position feedback.
Contact Us

For bulk pricing, technical support, or customized solutions, please contact our professional sales team:

WeChat / WhatsApp / Phone Number: +86 15116291548

Ratings & Review

Overall Rating

5.0
Based on 50 reviews for this supplier

Rating Snapshot

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100%
4 stars
0%
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All Reviews

A
Annie Dowson
United Kingdom Jan 8.2026
Helpful (105)
The Emerson AMS Trex we received is top quality – solid build, responsive touchscreen, and works perfectly with our HART and Fieldbus devices. It’s definitely made our commissioning and troubleshooting a lot more efficient. Also, big thanks to the seller – very professional, fast shipping, and they knew exactly what we needed. Super reliable supplier. Would absolutely buy from them again.
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Tel : +8615000725058
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edward.zhao@gongboshi.com
+8615000725058
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