Key Features

ATEX & IECEx Ex ia Certified
Intrinsically Safe Solenoid Valve
2/2 Way Normally Open
Fail-Open Valve Operation
Energise to Close Operation
Direct Acting Valve Design
Zero Pressure Differential
High Vacuum to 10⁻⁶ Torr
Pressure up to 20 Bar
1/8" to 1/2" BSP Port Sizes
Optional NPT Connections
1.2mm to 5mm Orifice Range
0.7–9 L/min Water Flow
316 Stainless Steel Body
Brass or Aluminium Options
Stainless Steel Internals
Multiple Seal Material Options
Bubble-Tight Shut-Off
Vibration Resistance to 9G
Up to 1000 Cycles per Minute
>10 Million Cycle Life
24V DC Ex ia Operator

Datasheets

Description

ATEX Ex ia Normally Open Solenoid Valve – Rotex 20201

The Rotex 20201 is an ATEX and IECEx Ex ia intrinsically safe normally open solenoid valve designed for hazardous-area applications requiring fail-open operation, low electrical power and reliable control from high vacuum through to 20 Bar.

Featuring 2/2 way normally open, direct-acting operation with the outlet at the top, the valve remains open when electrically de-energised and closes when the intrinsically safe solenoid is energised. Because it is direct acting, no minimum pressure differential is required.

Standard construction uses a 316 stainless steel CF8 body with stainless steel internals, with brass or aluminium body options available. The Rotex 20201 also provides bubble-tight shut-off, 9G vibration resistance, cycling rates up to 1000 operations per minute and a life expectancy exceeding 10 million cycles.

Valve Function & Operation

Function: 2/2 way normally open

Port arrangement: Outlet at top

Operation: Direct acting

The Rotex 20201 is open in its normal de-energised state, allowing media to flow through the valve without electrical power.

When the 24V DC intrinsically safe solenoid is energised, the valve closes and shuts off the flow.

This provides fail-open operation, making the 20201 particularly useful where the process requires the flow path to open automatically following loss of the electrical control signal.

Because the valve is direct acting, it does not depend on line pressure to switch.

Operating pressure:

0 to 20 Bar depending on orifice

High Vacuum & Zero Differential

The Rotex 20201 operates from:

High vacuum down to 10⁻⁶ Torr

through to:

20 Bar positive pressure

The exact maximum pressure depends on the selected orifice.

Its direct-acting construction means the valve can operate at zero pressure differential, providing significantly greater flexibility than a pilot-operated normally open valve.

Ports & Connections

Available BSP connections:

1/8" BSP

1/4" BSP

3/8" BSP

1/2" BSP

Optional NPT threads are available.

The outlet is positioned at the top of the valve, an important installation detail for this normally open configuration.

Orifice & Flow Options

Available orifices:

1.2mm

1.6mm

1.8mm

2.2mm

2.5mm

3.0mm

3.5mm

4.0mm

5.0mm

Water flow: 0.7 to 9 L/min at 1 Bar pressure drop

Maximum working pressure varies according to the selected orifice, so pressure and required flow should be considered together when specifying the valve.

Construction & Materials

Standard body:

316 stainless steel CF8

Optional body materials:

Brass

Aluminium

Internals:

Stainless steel

Shading ring:

Copper standard

Silver optional

Without shading ring optional

The standard stainless steel construction provides a robust option for demanding industrial and hazardous-area applications.

Seal & Media Compatibility

Available seals:

NBR

FKM (Viton®)

EPDM

PTFE / FKM

Hytrel

Suitable media include:

High vacuum

Air

Water

Gases

Compatible process fluids

Seal and body materials should be selected according to the particular medium, pressure, temperature and chemical compatibility requirements.

Performance & Reliability

The Rotex 20201 combines low-power intrinsic safety with strong mechanical performance:

Bubble-tight shut-off

Vibration resistance: Up to 9G

Maximum cycling: 1000 cycles/minute

Life expectancy: >10 million cycles

These characteristics make the valve suitable for frequently operated automated process applications as well as conventional hazardous-area fluid control.

Low-Power Ex ia Solenoid

Coil: Rotex III 14mm

Nominal voltage: 24V DC

Operating power: 2.3 Watts

Booster circuit: 8 Watts

Insulation: Class H

Protection: IP67

The booster circuit provides increased power during initial valve actuation before transitioning to the lower-power operating condition required by the intrinsically safe operator.

ATEX & IECEx Intrinsic Safety

Approvals:

ATEX

IECEx

IECEx certificate:

IECEx BAS 12.0128X – Issue 1

ATEX certificate:

Baseefa12ATEX0243X – Issue 1

Gas marking:

Ex ia IIC T5 Ga

-60°C ≤ Ta ≤ +75°C

Ex ia IIC T6 Ga

-60°C ≤ Ta ≤ +60°C

Dust marking:

Ex ia IIIC T200 125°C IP67 Da

-60°C ≤ Ta ≤ +75°C

The Ga and Da equipment protection levels provide a very high level of protection for hazardous gas and dust applications when incorporated into a correctly designed intrinsically safe system.

Intrinsically Safe Parameters

Minimum operating parameters:

Voltage: 10V

Current: 20mA

Power: 0.20W

Entity parameters:

Ui: 32V DC

Ii: 230mA

Pi: 2.3W

Li: 0

Ci: 0

The associated intrinsically safe barrier or galvanic isolator must comply with these certified entity parameters while also providing sufficient voltage and current for reliable valve operation.

Typical Applications

The Rotex 20201 is particularly suited to hazardous-area systems requiring normally open or fail-open fluid control, including oil and gas installations, chemical and petrochemical processing, high-vacuum systems, process skids, refineries, instrumentation, compressed gas systems and industrial process equipment.

Why Choose the Rotex 20201?

The key advantage of the Rotex 20201 is its combination of normally open fail-safe operation, Ex ia intrinsic safety and zero-differential direct acting control.

It provides reliable operation from 10⁻⁶ Torr high vacuum through to 20 Bar, while the low-power 24V DC operator allows integration into intrinsically safe hazardous-area control circuits.

Compared with the Rotex 20101 normally closed version, the 20201 is the appropriate choice where the process requires the valve to automatically open following loss of the electrical signal.

Related Products & Categories.

High Pressure Solenoid Valves

ATEX Solenoid Valves

View Technical Specification

Technical Specification

Brand: Rotex

Model: 20201

Width: 38.00 mm

Height: 87.00 mm

Depth: 38.00 mm

Weight: 1.00 kg

Valve / Product Type: Solenoid Valve

Body Material: Stainless Steel

Voltage: 24vDC

Port Size: 1/2 thread, 1/4 thread, 1/8 thread, 3/8 thread

Function: 2/2 Failsafe Open

Operation: Direct Acting from 0 Pressure

Seals: EPDM, NBR, PTFE (Teflon), FKM (Viton)

Media: Air, Fluid (Non Aggressive), Fluid (Slight Acid/Alkali), Gases (Non Aggressive), Gases (Slight Acid/Alakli), Oils + Fuels 50cSt Max, Vacuum (Low), Vacuum (Medium), Water, Water (RO/Pure/Demin)

Options required: Degreased, Manual Override, Mounting Holes, Shading Ring - Silver, Shading Ring - without

Orifice: 1.2mm, 1.6mm, 1.8mm, 2.2mm, 2.5mm, 3.0mm

Approvals:: ATEX Exia, IP65, IP66, IP67, IP68, CUTR, SIL3

Pressure: 0.02 Bar (20 mBar), 0.1 Bar (100 mBar), 0.2 Bar (200 mBar), 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.6 Bar, 2 Bar, 2.5 Bar, 3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar, 8.5 Bar, 9 Bar, 10 Bar, 12 Bar, 13 Bar, 14 Bar, 15 Bar, 16 Bar, 17 Bar, 18 Bar, 20 Bar

Found in these Categories

1/8-1/2 ATEX Exia Stainless solenoid valve 0-20 Bar 2/2 N/O

Name: 1/8-1/2 ATEX Exia Stainless solenoid valve 0-20 Bar 2/2 N/O
Brand: Rotex
SKU: 20201
Price: 409.29 GBP
Availability: InStock

£409.29 incl. VAT £341.08 ex. VAT

-33% Was ~~£612.45~~ incl. VAT

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Brand: Rotex

Model: 20201

Stock: 10 in stock

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