prima pagina

N.O. GAS SOLENOID VALVES WITH MANUAL RE-SET

GRA ... / OT

 click on picture to enlarge

 Path - First page - Products - Gas Solenoid Valves & Accessories - GRA/OT

APPLICATION

Without power they are opened, when powered they close; they have to be re-opened manually and remain open when powered.

FEATURES

  • Protection IP 54.

  • Brass body.

  • Working temperature: ­15 ... +60 °C.

  • Mounted with coil axis within 90° of vertical.

      Power supply   Flow rate m3/h (2)  
Code   DN V W P.max (1) mbar 0.5 mbar 1 mbar Data sheet
GRA 815/OT   1/2" 230 V ~ 16 500 0.7 1 G 932
GRA 415/OT   1/2" 24 V ~ 22 500 0.7 1
GRA 215/OT   1/2" 12 V – 22 500 0.7 1
 
GRA 820/OT   3/4" 230 V ~ 16 500 1.4 2 G 932
GRA 420/OT   3/4" 24 V ~ 22 500 1.4 2
GRA 220/OT   3/4" 12 V – 22 500 1.4 2
 
GRA 825/OT   1" 230 V ~ 16 500 3 4,3 G 932
GRA 425/OT   1" 24 V ~ 22 500 3 4,3
GRA 225/OT   1" 12 V – 22 500 3 4,3

  • (1) ­ Maximum working pressure

  • (2) ­ Flow of methane with pressure drop of 0.5 mbar (5mmWG) and 1 mbar (10 mmWG).

  • 100 mbar = 10 kPa = 1,000 mm.WG.

PRESSURE DROP GRA

 

FEATURES OF GAS SOLENOID VALVES

Model

Operation

Advantages

Disadvantages
 Normally open with manual re-set GRA

  • With power closes.

  • Without power opens only by manual action

  • In kitchen permits using gas even in event lack of mains supply.

  • In boiler plant, in event failure of mains power, valve remains open and burners safety system operates.  

  • On return of power, unnecessary manual operation to re-start plant.

  • In  event lack of mains power, valve remains open and gas safety system remains active only if powered by back-up battery.

  • At present these are not subject to approval.