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2W21-S Series 1/4 inch Solenoid Valve 12V Normally Closed

Features

No MOQ required
Multiple voltage options
2-way normally closed operation
Stainless steel body construction
Continuous duty cycle
Valves do not require a minimum operating pressure

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▋ Introduction

Wholesale Direct Acting 1/4 inch Solenoid Valve 12V normally closed (energise to open) for Water, Air, Oil, Steam, Gas available in all voltages (12V, 24V, 120V, 240V, etc) and size ranging 1/4 inch, 1/2 inch, 3/4 inch, 1 inch, 2 inch, etc. The coil is 100% ED rated for continual operation. Typical Applications include petrochemical, diesel farms, vacuum packaging, tank drain or low pressure service & general industry.

Refer to IOM to get 1/4 inch Solenoid Valve 12V Design, Diagram, Symbol, Dimension, Parts, Weight, Assembly & Installation Instructions.

1/4 inch Solenoid Valve 12V Price: Contact us

▋ Process Flow

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Raw Material Check

Employing the best raw material, carefully selected.

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Solenoid Coil Winding

Low temperature rise solenoid coil.

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Diaphragm Lasering

Laser cutting with accuracy and precision.

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CNC Machining

Advanced CNC machine from German.

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Semi-finished Products

Partly finished products & components.

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Solenoid Valve Assembly

Manufactured & assembled by qualified engineers.

▋ Finished Project

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▋ About COVNA

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COVNA – Solve your technical questions with solid experience

We are COVNA Automations, one of the top supplier of quarter turn actuators and solenoid operated valve products in Dongguan, China with 18 years experience. Our industrial experience will be useful in your business and projects.

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18 Years Operation

Good credit rating. Large quantities of regular clients.

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German Imported CNC Machine

Advanced CNC machine, engineer with high accuracy.

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ISO 9001 Certificated

With additional certifications that include TUV SGS RoHS.

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Affordable Prices

Our prices are both fair and affordable for all people.

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Qualified Engineers

Designed and manufactured by experienced engineers.

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Well-trained Staffs

Always available to answer your technical questions.

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ODM Services

Granted you free access to download 2D & 3D models.

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Standardization Production

Assure you of stable product quality and supply capacity.

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Same-day Shipping

Always keep a large stock of solenoid valves and components.

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Field Service

Provide continuous assistance in more than 40 countries.

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One Year Warranty, Life Service

A period of twelve (12) months from the shipment date.

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Global Presence

Find us at the exhibition or contact local representatives.

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Size Range	3/8" to 2"
Pressure Range	0MPa to 1.0MPa
Switching Function	Normally Closed (NC)
End Connection	Threaded
Body Material	Stainless Steel
Sealing Material	NBR, EPDM, VITON (FKM), PTFE (TEFLON)

Ordering Code

▋ Ordering Sample: 2W21-15-G-B-N-AC220V

2W21

Model

2W21 Series

Nominal Diameter

10: 3/8″

15: 1/2″

20: 3/4″

25: 1″

32: 1-1/4″

40: 1-1/2″

50: 2″

End Connection

G: G Thread

N: NPT Thread

F: Flanged

Body Material

B: Brass

S: Stainless Steel

P: Plastic

Sealing Material

N: NBR

E: EPDM

V: VITON (FKM)

P: PTFE (TEFLON)

Download

PDF Specification of 1/4 inch Solenoid Valve 12V.pdf
PDF 2W21 Series Solenoid Valve Data Sheets.pdf
PDF Installation, Operating & Maintenance Manual .pdf

CAD Dimension.dwg

Solenoid Valve FAQ's

▋ Frequently Asked Questions

Is the COVNA solenoid valve normally open or normally closed?

It is normally closed. When there is no power to the valve, it is in the closed position.

I want to cycle it all the time, what is the duty cycle of the valve?

The valve has a 100% duty cycle and is rated for continuous duty. It can be in the open position, with power applied, all the time without problems.

Can I use the valve with slurry type fluids?

No. Particulate matter can prevent the piston from completely closing the valve – causing leakage.

The coil on the valve get real hot, what “burn out” protection is there?

There is none and none is needed. The outside temperature of the coil can reach 180F in normal operation and will cause no damage to the valve.

At ambient temperature the chemical resistance chart shows my process media as OK with the valve and seal materials yet I’m still getting seal leaks. What’s wrong?

Fluid inside the valve can reach temperatures above ambient because of the operating temperature of the coil. The hot coil heats the process media which can raise its temperature considerably. Remember, the fluids that may not affect the valve seals at ambient temperature can cause problems at higher temperatures.

How fast does the valve open and close?

The valve opens and closes almost instantaneously.

The catalog says that the flow velocity through the solenoid valve should not be greater than 5 feet per second. Why?

As the flow velocity increases so does the potential for generating damaging shock pressures as the valve opens and closes. At flow velocities above 5 feet per second, this shock pressure can be great enough to damage the valve, especially the diaphragm seals.

My valve sometimes “sticks” and won’t close, what’s wrong?

If the inlet pressure is greater than 25 PSI, and the pressure differential (the difference between the inlet and outlet pressures) must be GREATER than 25 PSI of the valve to open and close smoothly. You can test it by operating the valve without pressure or flow going through it to verify that that is the cause.

When I go to close the valve it makes a “chattering” sound. Why?

Same answer as the last question.

The catalog says that the valve is rated at 150 PSI, yet the valve specs say that the inlet pressure can’t be above 120 PSI. Why?

The valve itself can withstand 150 PSI without damage, but the coil and spring that open and close the valve won’t work above 120 PSI.