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Gas Motor Valve VK
Gas motor valve VK..
- Automatic shut-off valve of Class
A according to EN 161.
- Sturdy design for long service life.
- Energy-saving through motor self-
stop.
- Available in single-stage or double
stage design with signal switch.
- Valve housing available in
GGG 50.
- Valve top can be supplied in
explosion-proof design.
- EC prototype tested and certified
(CE) .
Application
The gas motor valve is used to ensure
and control the gas and air supply to
gas burners and other gas-firing equip-
ment, also for two-stage operation. The
VK..G with GGG 50 housing meets the
requirements according to TRD 412,
par. 4.2 (application in outdoor installati-
ons), par. 5.1 (shut-off valve outside of
the boiler room) and GUV 17.4 (use in
landfills).
In areas subject to an explosion hazard
(zones 1 and 2) it is recommended to
use VK..X, e.g. in lacquer and varnish
factories, paint shops, refineries, chemi-
cal plants, sewage treatment plants,
landfills, gas/oil extraction plants, etc.
Operation
The motor valve type VK is a hydrauli-
cally actuated safety valve which is in
closed position when dead.
On application of mains voltage the
internal pump of the valve will build up
an oil pressure which causes the valve
disk to be forced down slowly via a
piston. The pump will stop as soon as
the fully opened position has been rea-
ched. As the pressure decreases the
pump will be shortly run again. For clo-
sing the valve, shut off the voltage
which will cause the oil pressure to
return to zero and the closing spring
force down the valve disk within 1 s.
General technical data
Type of gas:
City gas, natural gas, liquid gas (gase-
ous state) and air; also suitable for
biogas and landfill gas
Valve housing:
AlSi for VK..A DN 40 to DN 200;
GGG 50 for VK..G DN 50 to DN 200;
inside and outside with epoxy resin
powder coating. The two housings can
be combined with different tops.
Maximum inlet pressure: see Table of
Data; VK..G are pressure proof up
to 8 bar and pressure surge proof
up to 20 bar.
Valve top: AlSi
Valve disk sealing:
Perbunan up to DN 150
Polyurethane for DN 200
alternatively, Viton for DN 40-150
acc. to EN 161, Class A, Group 2
Measuring or pilot flame connection
Rp on either side of input and in out-
put; with stainless steel screen to pro-
tect valve seat and valve sealing.
Inside thread Rp according to ISO 7-1
Flange PN 16 according to ISO 7005
Closing time: 0.8 s
Ambient temperature: see versions
Storage and handling temperature:
-40°C to +60°C
Mains voltage: see versions
Power consumption: see table
Duty factor: CD 100%
Connection: conduit thread Pg 13.5
Protection classification: 1
Degree of enclosure: IP 54 according
to IEC 529
Take care to observe the regulations
of the local electric power supply com-
panies.
Opening time: VK VK..H
DN 40 5 s -
DN 50 - 65 8 s 12 s
DN 80 -100 10 s 18 s
DN 125 - 200 13 s 24 s