V370/HE
RK370/HE
3.3. Version with the solenoid
3.3.1.
MR version
In the MR version, the drive system comprises manual lever with a return spring and a solenoid
controlled with power gap. Opening of the valve occurs by turning the manual lever, during which the
return spring is stretched. The cut-off partition is kept open by the keeper of solenoid powered with
24V DC, connected to the power installation via micro-switch on the heat-responsive device. On
request of the ordering party, a valve of this type can be furnished with a rectifier transformer powered
with 230V AC. Closure of the cut-off valve can occur as a result of:
- automatically, as a result of increase in air temperature to the temperature where the heat-
responsive device of the electrical thermal element is actuated and contacts of the trigger
micro-switch are switched, and power supply to the solenoid is disrupted, or as a result of
disconnection of solenoid power supply by the control unit as a result of signals from other
sensors connected in the control system.
- manually by disconnecting power supply for the solenoid by a switch from the fire safety control
unit to periodically control valve operation.
Breaking (unsoldering) of the heat-responsive device in the trigger causes withdrawal of micro-switch
keeper and disrupting power supply to the solenoid. The spring installed on the drive shaft is released
and, via the lever system, causes closure of the partition. Additionally installed limit micro-switch, via
relevant electrical system allows for signalling the position of the valve partition, and makes it possible
to use it in control systems. Regardless of the type, valves with a return spring made of wire with
diameter of 3 mm are furnished with solenoid with keeper holding strength of 120 N. Valves with a
return spring made of wire with diameter of 3.5 mm are furnished with solenoid with keeper holding
strength of 200N N.
3.4.
ER version
– Opening and keeping the valve partition in the open position in this version, as
well as its closing, is performed by one of electrical actuators of BF series (including digital actuators)
or BLF series by Swiss company BELIMO, specially adjusted to operate fire safety valves. The
actuators can be powered with 24 V DC and AC voltage or with 230 V AC voltage. BLF type actuators
are applied in fire safety valves with the width not greater than 800 mm and height not greater than
500 mm.
Closure of the valve partition occurs automatically as a result of gap in power supply to the actuator.
Gap in power supply to the actuator can be caused by:
- increase in air temperature to the temperature where heat-responsive device of electric thermal
element is actuated and disconnects power supply to the actuator.
- disruption of power supply to the actuator from the signal from fire safety control unit.
Depending on the actuator type applied, the heat-responsive device is used, the operation of which is
identical as in the case of MR type fire safety valve, or some actuator types are manufacturer-
furnished with their own trigger BAE72-S or BAE72. Electric actuator kept live all the time maintains
the valve in the open position. Upon a gap in power supply, the return spring on the drive shaft, using
its accumulated mechanical energy, via the drive system, closes the partition and keeps it closed. In
the case of valve closure caused by power shortage, reconnection of power will cause valve opening.
If power shortage, however, was caused by actuation of the electrical thermal element, reopening of
