Description
ATEX Ex ia 2/2 Solenoid Valve – Rotex 24102 / 24202
The Rotex 24102 and 24202 are ATEX and IECEx Ex ia intrinsically safe pressure-assisted solenoid valves designed for hazardous-area applications requiring large port sizes, high flow capacity and low-power electrical control.
Available as 2/2 way normally closed Rotex 24102 or 2/2 way normally open Rotex 24202, the range covers connections from 1/2" to 3" BSP, with orifices from 12mm to 80mm and water flow rates up to 1000 L/min.
Manufactured with a 316 stainless steel CF8 body and stainless steel internals, these valves operate from 1 to 20 Bar and use a low-power Rotex III intrinsically safe solenoid with booster circuit.
Normally Closed or Normally Open
Two operating functions are available within the range:
Rotex 24102 – 2/2 Normally Closed
The valve remains closed when electrically de-energised and opens when the solenoid is energised.
Rotex 24202 – 2/2 Normally Open
The valve remains open when electrically de-energised and closes when the solenoid is energised, providing fail-open operation on loss of the electrical control signal.
This allows the same large-flow valve platform to be selected according to the required process fail position.
Pressure-Assisted Operation
Operation: Pressure assisted
Working pressure: 1 to 20 Bar
Minimum pressure differential: 1 Bar
Unlike the direct-acting Rotex Ex ia valves we've just covered, the 24102 / 24202 requires sufficient pressure differential across the valve for correct operation.
I would make that 1 Bar minimum differential quite prominent on the ecommerce page, particularly given the very large port sizes. It avoids customers assuming that the valve will operate from zero pressure simply because some of the smaller Rotex Ex ia valves do.
Ports & Connections
Available BSP connections:
1/2" BSP
3/4" BSP
1" BSP
1 1/2" BSP
2" BSP
2 1/2" BSP
3" BSP
Optional NPT threads are available.
This unusually broad size range makes the 24102 / 24202 particularly useful for higher-flow hazardous-area process applications.
Orifice & Flow
Orifice range:
12mm to 80mm, according to port size.
Water flow:
60 to 1000 L/min at 1 Bar pressure drop
The combination of up to an 80mm internal orifice and 1000 L/min water flow gives this range substantially greater capacity than the smaller direct-acting Ex ia valves.
Construction & Materials
Body:
316 stainless steel CF8
Internals:
Stainless steel
Shading ring:
Copper standard
Silver optional
Without shading ring optional
Available seals:
NBR
FKM (Viton®)
Hytrel
The stainless steel construction provides a robust valve platform for demanding industrial and hazardous-area process installations.
Media Compatibility
Suitable media include:
Air
Water
Gases
Compatible process fluids
Media compatibility should be confirmed against the selected sealing materials and the complete valve construction for the particular process.
Performance & Reliability
Bubble-tight shut-off
Vibration resistance: Up to 9G
Maximum cycling: 100 cycles/minute
Life expectancy: >2 million cycles
These performance figures are appropriate to the larger pressure-assisted construction and shouldn't be mixed with the 1000 cycles/minute and >10 million cycle specifications of the smaller direct-acting Rotex 20101 / 20201 series.
Low-Power Ex ia Solenoid
Coil: Rotex III 14mm
Design: With booster circuit
Power: 2.3 Watts
Protection: IP67
Insulation: Class H
Available voltages:
12V DC
24V DC
The low-power operator allows the large pressure-assisted valve to be controlled from a correctly designed intrinsically safe electrical circuit.
ATEX & IECEx Intrinsic Safety
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
This provides certified intrinsic safety for hazardous gas and combustible dust environments when incorporated into a correctly designed Ex ia system.
Intrinsically Safe Parameters
Entity parameters:
Ui: 32V DC
Ii: 230mA
Pi: 2.3W
Li: 0
Ci: 0
Minimum operating parameters:
Voltage: 10V
Current: 20mA
Power: 0.20W
The associated intrinsically safe barrier or galvanic isolator must comply with the certified entity parameters while providing sufficient electrical output for reliable solenoid operation.
Approvals & Certification Options
Standard approvals include:
ATEX – Baseefa12ATEX0243X
IECEx – IECEx BAS 12.0128X
CE
Additional options listed for the range include:
SIL 3
UL
Ex GOST R 2013
GOST K
Inmetro
PDO Oman
Where one of these optional approvals is required, the exact valve configuration and applicable certification should be confirmed when ordering.
Typical Applications
Typical applications include oil and gas installations, chemical and petrochemical processing, water treatment, process skids, refineries, tank farms, offshore equipment, compressed gas systems and other hazardous-area applications requiring large-bore intrinsically safe fluid control.
The normally closed 24102 is suited to applications requiring automatic shut-off following loss of the electrical signal, while the normally open 24202 is suited to processes requiring a fail-open condition.
Why Choose the Rotex 24102 / 24202?
The standout feature here is high flow combined with Ex ia intrinsic safety.
With port sizes up to 3", an 80mm maximum orifice and water flow up to 1000 L/min, the 24102 / 24202 provides a considerably larger flow solution than the compact direct-acting Rotex Ex ia range.
The choice of normally closed or normally open operation, 316 stainless steel construction and 1–20 Bar working range makes it a strong option for large hazardous-area process lines where a conventional low-flow intrinsically safe valve would be inadequate.
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