Speed control aSSembly
model a-1
tecHnIcal data
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]
Page 3 of 5
Form No. F_091794 16.04.28 Rev 16.1
5. operatIon
(Refer to Figure 1.)
The Viking Model A-1 Speed Control Assembly consists of a pre-assembled galvanized or brass pipe loop for installation between
the priming chamber and trim of the Viking Deluge or Flow Control Valve used.
One leg of the loop is equipped with a check valve to allow flow into the priming chamber only. The other leg is equipped with a
check valve that only allows flow out of the priming chamber.
Both legs are equipped with a special needle valve to adjust flow into or out of the priming chamber. The needle valves are modi-
fied to prevent complete closure, thus ensuring that fully closing the needle valves will not prevent the deluge valve or flow control
valve from operating. An additional strainer is provided in the outlet leg of the assembly to prevent the possibility of contaminants
entering release line devices.
With both needle valves fully opened, flow into the priming chamber will allow the valve to set at maximum speed and flow out of
the priming chamber will allow the valve to trip at maximum speed. By partially or fully closing the appropriate needle valve, the
setting and/or tripping speed can be reduced.
6. InSpectIonS, teStS, and maIntenance
After installation, the speed control assembly is considered a trim component of the valve on which it is installed. Refer to
Maintenance instructions provided in Technical Data for the valve used. Observe and apply all notices, warnings, cautions, and
recommended procedures pertaining to trim components for the valve used.
Perform all recommended inspections, testing, and maintenance procedures on a regular basis; at least as often as the minimum
frequencies recommended in Technical Data for the valve used.
Strainer maintenance procedures:
(Refer to Figure 1.)
note: Flushing of strainer may be performed after the deluge Valve or Flow control Valve has operated. If the system is
in operation when the strainer flushing plug is removed, water will flow from the opening.
1. To prevent operation of the deluge valve or flow control valve, verify that the main water supply control valve is closed.
2. Close the priming valve.
3. The speed control assembly and associated trim may be de-pressurized by temporarily opening the emergency release.
4. To flush the strainer screen:
a. Use the appropriate wrench to remove the strainer flushing plug.
b. Open the priming valve. Allow water to flow from the opening until it appears clear and free of debris.
c. Close the priming valve.
d. Re-install the flushing plug.
5. To remove the strainer screen for inspection and cleaning:
a. Use the appropriate wrench to loosen and remove the brass hex bushing and sealing washer.
b. The strainer screen can be removed for inspection.
c. Flush the screen with fresh water until clean.
d. Place the metal sealing washer over the threads of the hex-bushing.
e. Carefully insert the screen into the seat provided in the hex bushing.
f. Install the hex bushing with the screen. Use the appropriate wrench. DO NOT over-tighten.
6. When strainer maintenance is complete, place the system in service according to instructions printed in current Technical Data
for the Viking Flow Control Valve used.
a. Verify that the main water supply control valve and priming valve are open.
7. aVaIlabIlIty
The Viking Speed Control Assembly is available through a network of domestic and international distributors. See the Viking Corp.
Web site for closest distributor or contact The Viking Corporation.
8. gUaranteeS
For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.
caUtIon
plug and trim may be pressurized.
caUtIon
Hex bushing and trim may be pressurized.
