Operating instructions_SD1E2X-A2(A3)_15319_1en_09/2023
Page 8 www.argo-hytos.com
The SD1E2X-A2 and SD1E2X-A3 hydraulic valves are direct solenoid operated poppet valves. The valves are designed to be screwed into a shaped
cavity in a block with a 3/4-16 UNF connection thread. The shape and dimensions of the A2 (C-8-2) and A3 (C-8-3) screw-in cavity conform to ISO/TR
17209 technical specification.
The SD1E2X-A2 valve is designed for tight baffling of the working fluid flow, i.e. to stop the movement of the hydraulic cylinder piston rod or the
rotation of the hydraulic motor output shaft. The valve is manufactured in two versions. In the basic position, when the solenoid is de-energized, the
valve is open and free flowing (connection 2S6), or it is closed (connection 2S5). SD1E2X-A3 three-way valve is used to control a single-acting
appliance where the reverse motion is provided by the load. Another possible use is to alternately switch fluid flow to two branches of a circuit.
Valves with ATEX certification according to Directive 2014/34/EU and IECEx certification according to IECEx OD 009 and related harmonized
standards may be used in explosive atmospheres consisting of mine gas, gas or dust. The valves are marked with the CE Ex mark of conformity and
are accompanied by a Declaration of Conformity.
Use in explosive atmospheres:
Equipment - group I, mines, where the explosive atmosphere of firedamp consists predominantly methane.
The valve has a high level of safety (EPL = Mb), which makes initiation unlikely during the interval between gas discharge and valve shutdown.
It is designed for category M2 devices that remain off after gas discharge.
Equipment - group II, where the explosive atmosphere consists of gasses other than mine gas.
The valve has a high level of safety (EPL = Gb) which allows the valve to be used in zones 1 and 2. The valve must not be used in zone 0.
There is a risk of explosion. The valve is certified for gas groups IIA (typical gas is propane), IIB (typical gas is ethylene) also for hydrogen from group IIC.
The joint dimensions do not meet the requirements for Group IIC acetylene.
Equipment - group III, where the explosive atmosphere consists of dust and flammable flying particles.
The valve has a high level of safety (EPL = Db) which allows the valve to be used in zones 21 and 22. The valve must not be used in zone 20. There is
a risk of explosion. The valve is certified for all dust groups - IIIA (flammable flying particles), IIIB (non-conductive dust) and IIIC (conductive dust).
1. Use of product
Overview of signal words and warning signs used in the text
Overview of other symbols and abbreviations used in the text
Symbol, designation Description of the meaning of the symbol, designation
AC, DC Designation for alternating (AC) and direct (DC) current, voltage
ATEX Explosive Atmospheres
EPL Equipment Protection Level (see EN 60079.0)
IEC International Electrotechnical Commission
NBR Rubber used for the manufacture of seals
PA Polyamide
PE Polyethylene
PU Polyurethane
Glossary of technical terms used
›A hydraulic mechanism is one in which energy is transmitted via the pressure energy of the working fluid.
›A hydraulic directional control valve is a valve designed to control the direction of movement or stop the output component of an appliance.
›The volumetric flow rate Q is the amount of liquid in volume units that flows through a given flow cross-section per time unit (SI unit is m3s-1,
in practice the unit l/min is used)
›The control solenoid is designed to reposition the valve spool that interconnects or closes the ports in the body. The solenoid consists of
an excitation coil which, by passing an electric current through the winding, generates a magnetic field which exerts a force on the armature of
the mechanical actuating system.
›Poppet-type valve stops the flow by inserting the poppet into a seat at very low leakages compared to a spool valve.
›The screw-in valve is designed to be screwed into the moulded cavity in the hydraulic block. The valve body is replaced by a steel housing in
which the spool or poppet moves.
›Pressure is the force acting per area unit (SI unit Pascal (1 Pa = Nm-2), in practice the unit used is bar (1bar = 0.1MPa)
Valve type Cavity name The most common use of the valve
ARGO-HYTOS EATON
SD1E2X-A2 A2 C-8-2 for tight baffling of the working fluid flow to stop the movement of the hydraulic cylinder piston rod
SD1E2X-A3 A3 C-8-3 to control a single-acting appliance where the reverse motion is provided by the load
to alternately switch fluid flow to two branches of a circuit
DANGER Signal word combined with a warning sign used to signify that a dangerous situation which could result in
death or serious injury is imminent.
WARNING Signal word combined with a warning sign used to signify the occurrence of a potentially dangerous situation
that could result in death or serious injury if not avoided.
CAUTION Signal word combined with a warning sign used to signify a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
