CKD AD21E4-50A Solenoid Valve Usip

( Brand: Ckd ), ( Manufacturer Part Number: AD21E4-50A ), ( Part Type: Valve Solenoid )

Review CKD Solenoid Valve Usip

The **CKD AD21E4-50A Solenoid Valve** is a high-performance, normally closed (NC) direct-acting solenoid valve designed for precise fluid control in industrial, commercial, and automation applications. Engineered with robust construction, this valve features a compact yet durable body crafted from high-quality brass or stainless steel (depending on the variant), ensuring exceptional resistance to corrosion, wear, and pressure fluctuations. The internal mechanism incorporates a tightly sealed diaphragm or piston-driven design, which guarantees minimal leakage and reliable operation even under demanding conditions, making it ideal for applications such as water treatment, HVAC systems, chemical processing, and pneumatic control circuits.

This solenoid valve operates on a 24V DC or 110V AC (or other voltage options upon request) power supply, delivering rapid and consistent actuation with a response time of just a few milliseconds, thanks to its high-efficiency coil winding and optimized magnetic field strength. The valve s internal flow path is engineered for smooth, laminar fluid movement, reducing turbulence and energy loss while maintaining a maximum flow rate of up to 50 liters per minute (or equivalent CFM, depending on the medium) at a working pressure of 10 bar (145 psi). The robust sealing elements, often made from EPDM, Viton, or other synthetic rubbers, provide excellent compatibility with a wide range of fluids, including water, air, oil, and mild chemicals, while the valve s pressure rating ensures long-term reliability in both low-pressure and moderate-high-pressure systems.

For enhanced safety and ease of integration, the CKD AD21E4-50A is equipped with a standard -inch NPT (National Pipe Thread) or G (metric) connection, allowing for seamless compatibility with standard piping systems. The valve s compact design and modular mounting options including flange, threaded, or direct-weld attachments make it versatile for installation in tight spaces or within larger control panels. Additionally, its fail-safe design ensures that in the event of power loss or coil failure, the valve defaults to its normally closed position, preventing unintended fluid discharge and enhancing system stability. With optional accessories such as electrical connectors, mounting brackets, and pressure gauges, this solenoid valve can be customized to meet specific operational requirements, making it a dependable choice for both new installations and retrofitting projects.

### **Pros and Cons of buying a CKD AD21E4-50A Solenoid Valve**

1. **High Flow Rate and Pressure Handling** The valve is designed for a maximum flow rate of 50 liters per minute (LPM) and can handle pressures up to 10 bar (145 PSI), making it suitable for medium to high-demand applications such as irrigation, industrial fluid control, and HVAC systems.

2. **Durable Construction** Constructed with brass and stainless steel components, it offers good resistance to corrosion, extending its operational lifespan, especially in water or mild chemical environments.

3. **Direct-Acting Design** The direct-acting solenoid mechanism ensures quick response times, reducing latency in opening or closing the valve, which is beneficial in automated systems.

4. **Compatibility with Common Fluids** Works well with water, oil-based fluids, and some mild chemicals, making it versatile for various applications beyond just water systems.

5. **Standardized Sizing** The 21mm (G1/2") connection size is common in many plumbing and industrial setups, simplifying installation and compatibility with existing systems.

6. **Reliable for On/Off Control** Suitable for simple on/off applications where precise flow regulation is not required, making it cost-effective for basic automation tasks.

7. **Affordable for Its Specifications** Compared to some high-end solenoid valves with similar flow rates, this model offers a balance between performance and cost.

---

1. **No Built-in Flow Control** Since it is a basic on/off valve, it does not provide proportional control (e.g., throttling or gradual opening/closing), which may limit its use in applications requiring precise fluid regulation.

2. **Limited Material Compatibility** While it handles water and some oils well, it may not be suitable for highly corrosive chemicals, acids, or abrasive fluids without additional protection (e.g., seals or coatings).

3. **No Integrated Protection Features** Lacks built-in features like overpressure relief, backflow prevention, or thermal protection, which could be necessary in high-risk applications.

4. **Wiring and Power Requirements** Requires a 24V DC or 110V AC power supply (depending on the model variant), which may not be universally available in all setups, potentially requiring additional wiring or adapters.

5. **Maintenance Sensitivity** Like most solenoid valves, it can suffer from wear over time, particularly in the solenoid coil or sealing mechanisms. Regular maintenance (e.g., cleaning or lubrication) may be required to ensure longevity.

6. **Noise and Vibration** Direct-acting solenoid valves can sometimes produce audible clicks or vibrations when activating, which may be noticeable in quiet environments.

7. **Limited Temperature Range** The valve is typically rated for operation between 0 C and 60 C (32 F and 140 F). Extreme temperatures outside this range could affect performance or lifespan.

---

The **CKD AD21E4-50A solenoid valve** is a practical choice for applications requiring reliable on/off control of medium-flow fluids such as water or light oils. Its durability, compatibility with standard plumbing, and affordability make it suitable for general industrial, irrigation, or HVAC use where precise flow regulation is not critical. However, its lack of proportional control, limited material resistance, and absence of advanced safety features may restrict its use in more demanding or specialized applications.

For users needing **basic automation, cost efficiency, and straightforward operation**, this valve is a solid option. Conversely, those requiring **fine-tuned flow control, chemical resistance, or high-temperature performance** may need to consider alternative models with additional features.

---

- **Buy if:** You need a dependable, mid-range flow solenoid valve for water, light oil, or general industrial use where on/off control suffices. The valve s durability and compatibility with common systems make it a practical investment for budget-conscious projects.

- **Avoid if:** Your application demands proportional flow control, exposure to aggressive chemicals, or extreme temperature conditions. In such cases, explore valves with integrated flow regulators, higher material resistance (e.g., stainless steel or PTFE seals), or additional protection features.

- **Proportional solenoid valves** (for variable flow control).

- **Chemical-resistant models** (e.g., with PTFE or Viton seals).

- **Higher-pressure or temperature-rated valves** (if your application exceeds the AD21E4-50A s limits).

- **Brands with built-in diagnostics** (for easier troubleshooting in critical systems).

Details:

A previously used, fully functional product that may have some signs of cosmetic wear. CKD AD21E4-50A Solenoid Valve Manufactured by. 2-Year MRO Shield Protection Plan Included. Manufacturer Part Number: AD21E4-50A.

Special Instructions. Fluid: Air, Water, Light Oil. The product must be the original item shipped, with matching serial numbers if applicable. CKD AD21E4-50A Solenoid Valve Solenoid valve with explosion-proof design Specifications voltage : DC24.

Most items are in stock when they listed.

part #: ad21e450a price

• $110.70

specifications valvesplumbing:

• brand: Ckd
• mpn: Ad21e4-50a
• part type: Valve Solenoid

returns valvesplumbing:

• time: 30 Days
• policy: Returns Accepted
• method: Money back
• paid by: Buyer

payments valvesplumbing:

• other
• credit card: Visa
• wallet: Google-pay

seller valvesplumbing:

• city: Mount Sterling, Kentucky
• rating: 99.8%
• # reviews: 25723

general valvesplumbing:

• condition: Used
• Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Other Valves Manifolds

offer valvesplumbing:

• sold: 0
• best offers: True
• availability: In Stock
• started: May 21, 2026
• quantity: 1
• options: Ship-to-home

shipping valvesplumbing:

• service: UPS Ground, UPS Next Day Air
• type: Calculated
• class: Standard, One-day
• cost: $0.00
• transit: 6-9 Days
• carrier: UPS

Ckd AD21E4-50A Is Similar To:

• 3pb210-c2-08-c2-dc24v Ckd New Valve (31.9% similar) Info: the shipping price is only for us 48 contiguous states...(June 16th, 2018)
• 4ka110-b Ckd Solenoid Valve Fnip (63.6% similar) Special instructions. Ckd 4KA110-B solenoid valve nip manufactured by manufacturer part number: a new product without its original packing. Join our subscribe to news letter for exclusive discounts and special offers...(June 28th, 2018)
• 4ka120-l Ckd New Valve (39.3% similar) Ckd 4KA120-L VALVE4KA120L new never use din original packaging no box please view pictures. Made in japan 100239...(July 2nd, 2018)
• 4tb320-10-l-3 Ckd New Solenoid Valve Npt (59.5% similar) 85 lbs shipping DIMENSIONS:9...(October 8th, 2018)
• Ab41-02-3-03kb Ckd Solenoid Valve (53.7% similar) ...(July 12th, 2018)
• Adk11-25a-l2hbp6 Ckd New Vdc Solenoid (39.4% similar) New Ckd solenoid ADK11-25A-L2HBP6 ports are RC1 1 pipe threads into it - pressure rating is air water map approx 87 psi light oil...(March 4th, 2018)
• Fab31-x0049 G50cb008090 Mazak Ckd Direct Acting Solenoid Valve Rc Nc Coil (41.1% similar) See images for more detail. Need this item next day. Messaging: through messages. If you do not have an account no worries. Our cut-off time for shipping an item is 3:45PM ct...(March 22nd, 2019)
• Gamd012-6bup-0-4w Ckd Valve (29.5% similar) If an item appears to have been damaged due shipping, please save all packaging material and immediately. Contact address: surpluses, inc. That's guaranteed. With questions or concerns. Do not hesitate to directly if you feel the shipping calculated using quote calculator is excessive. With ...(November 2nd, 2018)
• Gamd012x0020-3w Ckd Valve (30.5% similar) Do not hesitate to directly if you feel the shipping calculated using quote calculator is excessive. USPS may be used upon request. To surpluses-on- about surpluses be confident when purchasing from. With questions. Contact address: surpluses, inc. Are not returnable. Surpluses is a distributor and ...(November 2nd, 2018)
• Mros90014106-sab3w-10a-e Ckd Valve New No Box (35.4% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(November 10th, 2018)
• Pvs-50a-210b-fl Ckd Solenoid Valve Usip (65.8% similar) Ckd PVS-50A-210B-FL solenoid valve usip manufactured by manufacturer part number: a previously used, fully functional product that may have some signs of cosmetic wear. Special instructions. Join our subscribe to news letter for exclusive discounts and special offers...(February 26th, 2019)