Technical data

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TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: [phone] Technical Services: 877-384-5464 Fax: [phone] Email: [e-mail]
February, 2010
PREACTION SPRINKLER
SYSTEM
5. The hole through the diaphragm at the discharge end of the PORV is plugged. The PORV
must be disassembled and the diaphragm checked for obstructions in the diaphragm hole,
by bending the diaphragm back and fourth at the location of the hole. This will break loose
any obstructions.
Problem:
The PORV doesn’t operate when the valve trips, and it doesn’t vent the priming chamber.
(No water flows out of the ¼” drain after the valve trips.)
Remedy:
1. The diaphragm at the discharge end of the PORV is split, and is allowing water to enter the
chamber behind the clapper faster than it can be vented through the schrader core valve.
The PORV must be disassembled and the diaphragm checked for tears, etc.
2. The ¼” drain from the schrader valve is plugged, and is not venting the water from the
chamber behind the clapper. Check the ¼” drain line to see if it is properly piped, and not
obstructed. These outlets are occasionally plugged. Remove the plug and use ¼” steel
piping to run the drain to the drip cup.
3. The hole through the diaphragm at the discharge end of the PORV is plugged. The PORV
must be disassembled and the diaphragm checked for obstructions in the diaphragm hole,
by bending the diaphragm back and fourth at the location of the hole. This will break loose
any obstructions.
4. Some drain piping installations from the ¼” connection of the PORV were run in copper
tubing instead of ¼” steel pipe. Check the tubing for dings or bends because the tubing
may be “pinched.” If the ¼” drain from the schrader valve is plugged or “pinched” off, the
PORV will not function properly.
2. Pneumatic Actuator
The Viking Model H-1 and corrosion resistant Model R-1 Pneumatic Actuators are both spring
loaded to open, rolling diaphragm, piston operated valves. They are used wherever a separation
is required between the detection and operating systems. There is a factory drilled weep hole
drilled into the spacer. The weep hole is there to identify either an air leak or water leak in the
device.
NOTE: THERE ARE SEVERAL VIKING DEVICES THAT LOOK SIMILAR TO THE VIKING
MODEL H-1 PNEUMATIC ACTUATOR, SUCH AS THE PSOV AND THE ANTI-FLOOD DEVICE.
DO NOT REPLACE ONE DEVICE WITH A SIMILAR LOOKING DEVICE. ALWAYS REPLACE
THE DEVICE WITH AN EXACT REPLACEMENT PART.
Problem:
There is air coming out of the weep hole in the pneumatic actuator.
Remedy:
The upper diaphragm is torn, scuffed, or cut, and is leaking air out through the diaphragm. With
the system shut down, remove the air piping from the top of the pneumatic actuator. Unscrew the
3 #10 x 24 x 1 ¼” HHS from the cover, and remover the cover and the upper diaphragm. Inspect
the device inside, and make sure there are no burrs, etc., that could cut the diaphragm. Replace
the diaphragm, and reassemble the device. Place the device back into the valve trim, and re-pres-
surize the system with air. Check for leaks, then return the system to service as described in the
current applicable technical data pages.