Risks And Limitations Of Product Use; Risks Associated With Operating In Explosive Atmospheres; Risks Associated With The Hydraulic Part Of The Valve - Argo-Hytos Rpex3-06 Gebrauchsanweisung

EN 60079-31, IEC 60079-31
Explosive atmospheres – Part 31: Equipment dust ignition protection by enclosure „t"
For the conformity assessment of the non-electrical part, the following standards were used:
EN 1127-1
Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and methodology
ISO 80079-36
Explosive atmospheres – Part 36: Non-electrical equipment for explosive atmospheres – Basic method and requirement
ISO 80079-37
Explosive atmospheres – Part 37: Non-electrical equipment for explosive atmospheres – Non-electrical type of protection constructional safety „c",
control of ignition sources „b". liquid immersion „k"
EN ISO/IEC 80079-38
Explosive atmospheres – Part 38: Equipment and components in explosive atmospheres in underground mines

3. Risks and limitations of product use

3.1 Risks associated with operating in explosive atmospheres

DANGER
DANGER
DANGER
3.2 Risk associated with the hydraulic part of the valve
DANGER
DANGER
WARNING
CAUTION
CAUTION
CAUTION
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Explosive atmosphere type and zone
The valve must not be used outside the specified range (see paragraph 1Product use ), in particular it is not
intended for equipment category M1group l (mines) zone 0 group II (gases) and zone 20 group III (dust).
Risk of explosion.
Surface temperature
When selecting the valve, the surface temperature requirement of the valve must be taken into account.
It must be min. 25 °C lower than the temperature necessary to initiate an explosion of an explosive
atmosphere of a given composition. If the initiation temperature is exceeded an explosion will occur.
Handling in an explosive atmosphere
It is forbidden to install, disassemble, repair or replace the valve in an exlosive atmosphere.
Risk of explosion.
Maximum operating pressure
The valve may be used for a maximum pressure of 350 bar in the ports P, A, B and 210 bar in portT.
If the maximum pressure is exceeded there is a risk of damage to the valve.
Exceeding the pressure value may cause the valve to rupture
I.e. exceeding 525 bar in ports P, A, B and 315 bar in port T.
Maximum hydraulic output
Section 4.6 of the product catalogue shows the operating limit curves for each type of spool valve. The
hydraulic performance is provided as the product of the working pressure and the flow rate. If the instant
power exceeds the curve limit, the valve may lose function . The spool is subjected to excessive hydrodynamic
forces, the valve will not stop and as a result ,control of the appliance will be lost.
Valve installation
The valve may only be mounted to a sufficiently machined surface with a specified connection pattern. The
specified sealing rings must be inserted, undamaged into the body recesses. The valve is fastened with four
M5x45 ISO 4762 bolts tightened to a tightening torque of 8.9 + 1 Nm. Otherwise, there is a risk of leakage of
the working fluid and loosening of the valve by pressure (For details, see paragraph 7.2 Product installation)
Maximum operating temperature
The maximum operating temperature must not exceed the temperature range allowed in paragraph 4.4 Basic
technical parameters or in the product catalogue. Both the temperature of the operating fluid and the ambient
temperature significantly influence:
a) the surface temperature of the valve
b) the temperature of the solenoid coil winding - there is a risk of a reduction in hydraulic performance
c) the seal material - risk of seal damage and leakage of the working fluid.
Surface temperature of the valve
The surface temperature of the valve can exceed 100 °C due to the temperature of the working fluid and pressure
loss in the valve being converted to heat. Do not touch the surface of the valve when the circuit is operational,
even after switching off. Wait until it has cooled down to a safe temperature. There is a risk of burns.
Working fluids used
Valves may only be used for normal working fluids, especially hydraulic oils (see chapter 4. Product description).
It is forbidden to use the following as working fluids, in particular:
› water and aquesous solutions that will cause corrosion and loss of valve function
› liquids which are flammable or explosive, the heating of which may cause fire or explosion when
passing through the valve
› aggresive liquids (e.g. acids and hydroxides) which will cause damage to the valve and loss of
function.
The flash point of the used working fluid must be at least 50 K higher than the maximum allowed of surface
temperature of the valve in the given temperature class.
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Subject to change_RPEX3-06_14054_1en_03/2022