Argo-Hytos SD3EX-B2, Руководство по эксплуатации, Страница: 6 / 42

Subject to change_SD3EX-B2_SD3EX-C2_14067_1en_06/2022
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The SD3EX-B2 and SD3EX-C2 hydraulic valves are indirectly controlled poppet-type valves with the control stage controlled by a solenoid and the
main stage cone controlled hydraulically. The SD3EX-B2 valve is designed to be screwed into the B2 (C-10-2) formed chamber in a block with a
7/8-14 UNF connection thread, the SD3EX-C2 valve into the C2 (C-12-2) formed chamber with a 1-1/16-12 UN thread. The shape and dimensions of
the chambers for the B2 and C2 installation complies with the technical specification ISO/TR 17209. The product is designed for tight switching of the
working fluid flow, i.e. for stopping, for example, the movement of the piston rod of a hydraulic cylinder or the rotation of the output shaft of a
hydraulic motor. The valve is available in two versions. In the basic position, when the solenoid is without electrical supply, the valve is open and free
flowing (connection 2O2) or closed (connection 2L2).
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:
Class I , mines, where the explosive atmosphere of mine gas is prodominantly methane
The valve has a high degree of protection (EPL = Mb), which makes iniation unlikely during the interval between gas discharge and valve shutdown.
It is designed for category M2 devices that remain off after gas discharge.
Class II , where the explosive atmospere consists of gasses other than mine gas
The valve has a high degree of protection (EPL = Gb) which allows the valve to be used in zones 1 and 2. There is a risk of explosion.
The valve is certified for all gas groups - IIA (typical is methane), IIB (typical is ethylene) and IIC (typical is hydrogen).
Class III , where the explosive atmosphere consists of dust and combustible flammable particles
The valve has a high degree of protection (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 (combustible fly particles), IIIB (non-conductive dust) and IIIC (conductive dust).
1. Use of product
An overview of signal words and warning signs used in the text
An 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 Polyuretane
Glossary of technical terms used
› A hydraulic mechanism is one in which energy is transmitted via the compressive 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 indirectly controlled valve consists of two basic parts. The control stage is operated directly, e.g. by a solenoid. The main stage is
hydraulically controlled depending on the position of the control stage.
› The volumetric flow rate Q s the amount of liquid in volume units that flows through a given flow cross-section per unit time (SI unit is m
3
s
-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 control system.
› Poppet-type valves damps the flow by inserting the cone into the saddle with very low volume losses compared to a spool valve.
› The screw-in valve is designed to be screwed into the moulded chamber in the hydraulic block. The valve body is replaced by a steel sleeve in
which the spool or cone moves.
› Pressure is the force acting per area unit (SI unit Pascal (1 Pa = Nm
-2
), in practice the unit used is bar (1bar = 0.1 MPa)
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 a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION
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.