VAS Gas Valves

Kromschroder VAS Gas Valve
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Safety shut-off valves for gas
Suitable for a max. inlet pressure of 500 mbar (500 hPa/7 psig)
Easy installation into a system
Compact design saves space
No extra valve required owing to integrated flow adjustment
Check indication by blue LED
Proof of closure switch with integral visual position indicator
Suitable for high-duty cycling
EC type-tested and certified
FM, ANSI/CSA and AGA approved, UL listed
Certified pursuant to GOST-TR
VAS 1: certified for systems up to SIL 3 and PL e
Technical Data

Gas types: natural gas, LPG (gaseous), biologically produced
methane (max. 0.1 %-by-vol. H2S) or clean air; other
gases on request. The gas must be dry in all temperature
conditions and must not contain condensate.
CE and FM approved, UL listed, max. inlet pressure pu:
500 mbar (500 hPa/7 psig).
FM approved, non operational pressure: 700 mbar
(700 hPa/10 psig).
ANSI/CSA approved: 350 mbar (350 hPa/5 psig).
Flow adjustment limits the maximum flow volume between
approx. 20 and 100%. On VAS 1 – 3, the setting can be monitored
on an indicator.
Adjustment of the start gas rate: 0 to approx. 70%.
Opening times:
VAS../N quick opening: ≤ 1s;
VAS../L slow opening: up to 10s.
Closing time:
VAS../N, VAS../L quick closing: < 1s.
Ambient temperature: -20 - 60 °C (-4 - 140 °F),
no condensation permitted.
Storage temperature: -20 - 40 °C (-4 - 104 °F),
no condensation permitted.
Safety valve:
Class A Group 2 pursuant to EN 13611 and EN 161,
Factory Mutual (FM) Research Class: 7410 and 7411,
ANSI Z21.21 and CSA 6.5.
Mains voltage:
230 VAC, +10/-15%, 50/60 Hz,
200 VAC, +10/-15%, 50/60 Hz,
120 VAC, +10/-15%, 50/60 Hz,
100 VAC, +10/-15%, 50/60 Hz,
24 VDC, ±20%.
Cable gland: M20 x 1.5
Electrical connection: cable with max. 2.5 mm2 (AWG 12) or
plug with socket to EN 175301-803.

Application

Solenoid valves for gas VAS and double solenoid valves VCS for safeguarding and controlling the air and gas supply to gas burners and gas appliances. For use in gas control and safety systems in all sectors of the iron, steel, glass and ceramics industries, also in commercial heat generation, such as the packaging, paper and foodstuffs industries.

Function

The gas solenoid valve VAS is closed when it is disconnected from the power supply.

Opening:
Connect the system to the electrical power supply (alternating voltage will be rectified). The blue LED lights up. The coil’s magnetic field pulls the armature with the attached
valve disc upwards. The gas solenoid valve VAS opens. The double valve seat means that the forces from the inlet pressure are divided almost equally between the two valve seats.

Closing:
Disconnect the VAS from the electrical power supply. The blue LED goes out. The armature is pressed into its initial position by the closing spring. The gas solenoid valve closes within 1s.

The strainer in the inlet of the gas solenoid valve prevents deposits of dirt particles on the valve seats. The pressure loss through the strainer is very low.

Maintenance Cycles
At least once per annum, at least twice per annum for biologically-produced methane.

If the flow rate drops, clean the strainer!
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