TECHNICAL DATA
2” MoDEL G-2000 Dry vALvE
rISEr ASSEMBLy
Page 6 of 13
The viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: [email protected]
visit the viking website for the latest edition of this technical data page www.vikinggroupinc.com.
Form No. F_011110 17.04.27 Rev 17.1
B. Loss of System Air Pressure:
When a sprinkler operates or air pressure is lost, the sensing end of the differential valve loses pressure and the differential valve
opens. Prime water is drained from the prime chamber, causing the dry pipe valve to open, filling the sprinkler piping with water.
Water from the intermediate chamber of the dry pipe valve pressurizes the sensing end of the PORV, causing the PORV to open. The
open PORV vents air pressure from the air supply, preventing the differential valve from closing and re-establishing prime pressure.
Figure 7 - Loss of System Air Pressure
6. INSPECTIoNS, TESTS & MAINTENANCE
It is imperative that the system is inspected and tested on a regular basis. The frequency of the inspections may vary due to contami
-
nated water supplies, corrosive water supplies, corrosive atmospheres, as well as the condition of the air supply to the system. For
minimum testing and inspection requirements, refer to NFPA 25. In addition, the Authority Having Jurisdiction may have additional
testing, and inspection requirements that must be followed. Viking does not require internal inspection of the valve as part of routine
inspection and testing. Internal maintenance is generally only required for valve repairs and internal component replacement.
Maintenance of the Model G-2000 Dry Valve shall be conducted in accordance with the instructions in section 6.III.
WArNING
Do NoT SEPArATE THE CovEr AND BoDy SECTIoNS UNLESS THE vALvE IS LEAKING.
