Viking G-2000 Technical Data Manual

Page 1 of 13

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]

Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.

RISER ASSEMBLY

1. DESCRIPTION

2” MODEL G-2000 DRY VALVE

The Viking 2” Model G-2000 Dry Valve Riser Assembly consists of a small prole, light
weight, pilot operated valve that is used to separate the water supply from the dry
sprinkler piping, which is pressurized with air. The pilot operated valve combines an
internal diaphragm assembly that is pressurized closed with priming water, an internal
check valve to isolate the sprinkler system piping, and the Model A-1 Differential Valve
located on the valve trim that allows the valve to operate upon loss of air pressure.
The differential design of the differential valve allows an air supply of moderate pres­sure to control a higher water supply pressure. When the air pressure in the dry pipe
system is reduced sufciently upon the differential valve due to a sprinkler head op­eration to destroy the pressure differential, the differential valve will open and relieve
the priming pressure from the internal diaphragm assembly. The internal diaphragm
assembly will compress, allowing water to pass through the body of the valve and cen­ter of the internal check valve, entering the sprinkler system piping. The Viking Model
G-2000 Valve is designed to be used with a water ow pressure switch and/or water
motor gong. For systems that require an accelerator to increase the speed of water
delivery, the Viking Model E-1 Accelerator shall be used.

2. LISTING AND APPROVALS

cULus Listed: VPZV

FM Approved: Dry Pipe Valves

3. TECHNICAL DATA

Specifications:

Pressure Rating: 250 psi (17.2 Bar) Water Working Pressure
Factory Hydrostatically Tested to: 500 psi
Air to water differential: Approximately 5.75 to 1
Friction Loss (Given in feet of Schedule 40 pipe based on Hazen & Williams formula C = 120):
G-2000 Dry Valve - 8.5’
10” Section of Pipe - 1’
Water Supply Control Valve: 1.9’
G-2000 Dry Valve Cv Factor: 115.6
Valve Color: Black

Material Specifications: Refer to Figure 11.
Ordering Information:

Available since 2010

Part Number: G-2000 Dry Valve Riser Assembly (See Figure 8) - 16149-1
Shipping Weight: 78 lbs (36 kg)

Q = C

∆P

v

√

Q = Flow
Cv = Flow Factor (GPM/1 psi ∆P)
∆P = Pressure Loss through Valve

S

S = Specic Gravity of Fluid

Accessories:

Model E-1 Accelerator: 08055
Drain Manifold: 16211 (See Figure 9)
Model LD-1 Anti-Column Device: 14800

4. INSTALLATION:

A. General Installation Instructions

1. For proper operation and approval, the valve must be installed in the vertical position as trimmed from the factory. DO NOT
modify the factory assembled trim except as described in this technical data page.

2. Viking recommends installing a 10” section of pipe directly above the dry pipe valve. Prior to valve maintenance, this section

of pipe may be removed to provide clearance for lifting the cover from the body.

3. The dry valve must be installed in an area not subject to freezing temperatures or physical damage. If required, provide a
valve house (enclosure) with adequate heat around the dry valve and trim. Freezing temperatures and/or excessive pressure
will damage the dry valve. When corrosive atmospheres and/or contaminated water supplies are present, it is the owner’s
responsibility to verify compatibility with the Model G-2000 Dry Valve and associated equipment.

4. The Viking Model E-1 Accelerator should be installed at the location indicated in Figure 1 when required by the installation
standard or local Authority Having Jurisdiction.

5. The optional Model LD-1 Anti-Column Device may be installed to prevent water accumulation above the dry pipe valve.

6. The prime line connection shall be made upstream of the water supply control valve using 1/2” or larger pipe.

Form No. F_011110 17.04.27 Rev 17.1

Replaces page 137a-m, dated January 6, 2012.

(Revised figures 1, 6, 7, 9 and 10)

Page 2 of 13

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]

Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.

Table 1 - Pipe Capacity for Sizing Air Compressors

Pipe Diameter Capacity

Schedule 40 (1” to 6”)

US International

Schedule 30 (8”)

Gal / Ft L / m Gal / Ft L / m

1” DN25 0.045 0.559 0.049 0.608
1-1/4” DN32 0.078 0.969 0.085 1.043
1-1/2” DN40 0.106 1.316 0.115 1.428

2” DN50 0.174 2.161 0.190 2.360
2-1/2” DN65 0.248 3.080 0.283 3.515

3” DN80 0.383 4.756 0.434 5.390
3-1/2” DN90 0.513 6.370 0.577 7.165

4” DN100 0.660 8.196 0.740 9.190

5” DN125 1.040 12.915 1.144 14.206

6” DN150 1.501 18.640 1.649 20.477

8” DN200 2.660 33.032 2.776 30.472

For Metric Units 1 Ft. = 0.3048 M, 1 Gal. = 3.785L

Schedule 10

Table 2 - Air Pressure Settings

Maximum Water

Pressure

psi bar psi bar psi bar

50 3.4 22 1.5 27 1.8

75 5.1 26 1.8 31 2.1
100 6.8 30 2.0 35 2.4
125 8.6 34 2.3 39 2.6
150 10.3 38 2.6 43 2.9
175 12.0 42 2.8 47 3.2
200 13.7 45 3.1 50 3.4
225 15.5 49 3.4 54 3.7
250 17.2 53 3.6 58 3.9

Supervisory Pressure Switch should be set 5 psi

(0.34 bar) below air compressor cut out.

RISER ASSEMBLY

Air Pressure Setting

Minimum Maximum

2” MODEL G-2000 DRY VALVE

B. Air Supply Design

Calculating Trip Pressure and Air Compressor Size
To calculate the point where the water pressure will overcome the air pressure and trip the valve, divide the static system water pres­sure by the differential (Approximately 5.75:1).

Example:

Static Water Pressure = 64 psi (4.4 bar) → Trip Point = 64 / 5.75 = 11 psi (0.76 bar).
The dry valve will trip when the air pressure is reduced to 11 psi (0.76 bar).

NFPA 13 requires that the air supply be capable of lling the entire sprinkler system to its required air pressure within 30 minutes. A
common method of sizing an air compressor is to use the following formula:

Compressor Size (cfm) = 0.012 x V (gal)
Where V = System volume and 0.012 is a common multiplier that will provide 40 psi (2.8 bar) in 30 minutes.
The following formula may be used for air pressures different than 40 psi (2.8 bar):

Where:

V = Volume

Compressor
Size (cfm) =

V x P

7.48 x 14.7 x T

P = Required Air Pressure (Trip Pressure + 15 psi)
T = Fill time (typically 30 min.)

7.48 = gal. / ft.

3

14.7 = atmospheric pressure

Example:

System volume as determined by table 1 = 750 gallons
System water pressure = 73 psi (5 bar)
Required air pressure = (73/5.75) + 15 = 28 psi (1.93 bar)

Compressor Size (cfm) =

(750 x 28)

7.48 x 14.7 x 30

= 6.4 cfm

Therefore, the compressor shall be capable of providing 7 cfm.

D. Pressure Switch Wiring;

Wire the Alarm Pressure Switch (PS10) and Air Superviso­ry Switch (PS40), and adjust pressure settings as shown in
Figures 3 - 5.

Table 3 - Quick Reference Compressor Size

Compressor

Size (HP)

1/6 1.0 90
1/3 2.0 180
1/2 3.1 300

1 5.9 600

Free Air @ 40 psi

(2.8 bar) (cfm)

Maximum Gallons in

System to Pump to 40 psi

(2.8 bar) in 30 Minutes

Form No. F_011110 17.04.27 Rev 17.1

Page 3 of 13

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]

Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.

Optional
Accelerator
Connection

Waterflow

Pressure

Switch

Check

Valve

Air Supervisory

Switch

Air Pressure

Gauge & Valve

PORV

Supply

Pressure

Gauge & Valve

Control Valve

Air Supply

Connection

Prime
Valve

Connection

Model A-1

Differential

Valve

Prime Pressure
Gauge & Valve

Check

Valve

Flow Test

Valve

Strainer

Air Supervisory

Switch

Air Supply

Optional
Accelerator
Connection

PORV

Drip

Check

Drip
Cup

RISER ASSEMBLY

Air Pressure

Check Valve

Flow

Valve

Gauge & Valve

Prime Pressure
Gauge & Valve

Test

Supply Pressure

Gauge & Valve

Waterflow

Pressure

Switch

Main
Drain

2” MODEL G-2000 DRY VALVE

Figure 1 - Trim Components

Form No. F_011110 17.04.27 Rev 17.1

Figure 2 - Air Supply Options

Page 4 of 13

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]

Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.

C. Air Supply Installation

1. Install the required air supply as described in Viking technical data page 105a-e. The size of the compressor and amount of
air required should be determined in accordance with Table 1. The air or nitrogen supply to the dry pipe system must be clean,
dry, and oil free.

2. Automatic air supplies must be regulated, restricted, and from a continuous source. A Viking Air Maintenance Device should
be installed on each system equipped with a tank-mounted compressor, plant air or nitrogen. For riser-mounted compressors
with a capacity less than 5.5 ft
In addition, the use of an air maintenance device with riser-mounted compressors can lead to compressor “short cycling”.
Viking always recommends that a tank-mounted compressor with air maintenance device be used. This can become critical

when accelerators are installed on the system.

3

/min at 10 psi (0.154 m3/min at 0.7 bar), NFPA 13 does not require an air maintenance device.

RISER ASSEMBLY

2” MODEL G-2000 DRY VALVE

Figure 3 - Alarm Pressure Switch Wiring

(Alarm Pressure Switch should be set to 5 psi (0.34 bar)

PS40-2

TO FIRE
ALARM
PAN EL

COM

EOLR

12

COM

1

HIGH

AIR

2

WITH NORMAL SYSTEM

LOW

PRESSURE APPLIED HIGH

AIR

- TERMINAL 1 WILL CLOSE
ON PRESSURE I NCREASE.

DWG# 930-2

Figure 4 - Air Supervisory Switch Wiring

(High Air should be set to 10 psi (0.7 bar) above compressor cut out)

(Low Air should be set to 5 psi (0.34 bar) below comperssor cut out)

E. Air Leakage Test:

Perform air leakage test at 40 psi (2.8 bar) for 24 hours per NFPA 13. If pressure loss of 1.5 psi (0.1034 bar) or greater occurs, repair

leaks.

F. Hydrostatic Test:

The dry system, including sprinkler piping and sprinklers shall be hydrostatically tested at 200 psi (13.8 bar) and maintained for 2
hours, in accordance with NFPA 13. Systems normally subjected to working system pressures in excess of 150 psi (10.3 bar) shall be
tested at a pressure of 50 psi (3.45 bar) in excess of system working pressure.

G. Placing the Valve in Service:

When the dry pipe system is ready to be placed in service, verify that all equipment is adequately heated and protected to prevent
freezing and physical damage.

1. Verify that the water supply main control valve supplying the dry valve is closed.

2. Close the prime valve.

3. Open the main drain valve.

4. Drain all water from the dry pipe system. If the system has operated, or if water has entered the system, allow enough time

to completely drain the system.

5. Close the main drain valve.

6. Open the flow test valve.

7. Establish air pressure on the system.

8. When air pressure has been established, open the priming valve. Prime water pressure will enter and expand the valve’s
internal diaphragm assembly onto the valve seat, effectively closing the valve. Verify prime pressure has been established on
the prime pressure gauge.

Form No. F_011110 17.04.27 Rev 17.1

FIELD ADJUSTMENTS:
Alarm Pressure Switch: The operating point of the switch can be

adjusted to any point between 4 psi (0.27 bar) and 8 psi (0.55 bar)
by turning the adjustment knob(s) clockwise to raise the actuation
point or counter-clockwise to lower the actuation point.

Air Supervisory Switch: The operating point of the switches

can be adjusted to any point between 10 psi (0.7 bar) and 60 psi
(4.1 bar) by turning the adjustment knob(s) clockwise to raise the
actuation point or counter-clockwise to lower the actuation point.
The high and low switches are adjusted independently.

Figure 5 - Pressure Adjustment