Viking VXD - User Manual

The Viking Model VXD Single-Interlocked Preaction System with Electric Release is a fire protection system designed to prevent undetected leaks and provide controlled water discharge in the event of a fire. It utilizes a Viking Model VXD Deluge Valve and a pneumatically pressurized automatic sprinkler system.

Function Description:

This system is primarily used in environments where sprinkler piping or sprinklers may be susceptible to damage. In its normal "SET" condition, water supply pressure is maintained in the priming chamber of the deluge valve through a priming line, which includes a normally open priming valve, strainer, restricted orifice, and check valve. This pressure holds the deluge valve diaphragm closed, keeping the outlet chamber and system piping dry.

In fire conditions, an approved release control panel, connected to a compatible detection system, energizes a normally closed solenoid valve, causing it to open. This releases pressure from the priming chamber faster than it can be supplied, leading to the deluge valve diaphragm opening. Water then flows into the system piping and alarm devices, activating water motor alarms and/or water flow alarms. Water will discharge from any open sprinklers or spray nozzles. If no sprinklers have opened, water will fill the sprinkler system piping, but discharge will only occur once a sprinkler opens.

In trouble conditions, such as a sprinkler opening before detection system operation or a loss of supervisory pressure in the sprinkler piping, a low air pressure condition will be signaled by the air supervisory switch. However, the deluge valve will NOT open. If the detection system operates due to mechanical damage or malfunction, the deluge valve will open, but water will be contained within the sprinkler piping, and alarms will activate.

Manual operation is possible by pulling the emergency release, which releases pressure from the priming chamber and opens the deluge valve, allowing water to flow into the system piping and from any open sprinklers/nozzles.

Important Technical Specifications:

Nominal Sizes Available: 1-1/2", 2", 2-1/2", 3", 4", 6", 8", 10".
Part Numbers (Loose Trim):
- Galvanized: 23562-1 (1-1/2"), 23583-1 (2"), 23604-1 (2-1/2"), 23625-1 (3"), 23646-1 (4"), 23668-1 (6"), 23689-1 (8"), 23750-1 (10").
- Brass: 23562-2 (1-1/2"), 23583-2 (2"), 23604-2 (2-1/2"), 23625-2 (3"), 23646-2 (4"), 23668-2 (6"), 23689-2 (8"), 23750-2 (10").
Part Numbers (Pre-trimmed Galvanized): 23563 (1-1/2"), 23584 (2"), 23605 (2-1/2"), 23626 (3"), 23647 (4"), 23669 (6"), 23690 (8"), 23751 (10").
Recommended Supervisory Pressure: 20 PSI (1.4 bar) in closed sprinkler piping.
Air Supervisory Switch Activation: Set to activate at 15 PSI (1.03 bar) on pressure drop.
Alarm Pressure Switch Activation: Activates when pressurized to 4 to 8 PSI (0.3 to 0.6 bar) on pressure rise.
Air Supply Compressor Sizing: Must be sized to establish total required air pressure in 30 minutes.
Listings and Approvals: cULus Listed (Categories VLFT and VLFT7), FM Approved.

Usage Features:

Single-Interlocked Operation: Requires both the detection system to operate and a sprinkler to open for water discharge, preventing accidental water release.
Leak Prevention: Pneumatically pressurized sprinkler system helps prevent undetected leaks.
Electric Release: Utilizes an electric solenoid valve controlled by a release control panel for reliable activation.
Manual Override: Emergency release valve allows for manual activation of the system.
Dry System Piping: Keeps the sprinkler piping dry until activation, reducing the risk of water damage from accidental discharge.
Component Information: Additional system components like the Pressure Operated Relief Valve (PORV) and Solenoid Valve have scannable/clickable links for more information.
Installation Guidance: References current Viking Technical Data for individual components and applicable installation standards, codes, and Authorities Having Jurisdiction.

Maintenance Features:

Weekly Visual Inspection: Recommended to check the main water supply control valve, other valves, and for signs of mechanical damage, leakage, or corrosion.
Quarterly Water Flow Alarm Test: Involves opening the alarm test valve to verify local electric and mechanical water motor alarms, and remote station alarm signals.
Quarterly Main Drain Test: Involves recording water supply pressure, fully opening and slowly closing the flow test valve, and comparing results to previous data.
Annual Trip Test: A critical test that involves operating a detector to trip the system, allowing full water flow. This test requires precautions to prevent damage as water will flow into the sprinkler piping and from any open sprinklers/nozzles.
Maintenance After Each Operation: Includes inspecting the entire system for damage, replacing release devices/sprinklers, flushing the system if exposed to corrosive water, and performing semi-annual maintenance.
Semi-Annual Maintenance: Involves removing the system from service, closing control valves, relieving priming chamber pressure, inspecting and cleaning all trim for corrosion/blockage, and cleaning/replacing strainer screens.
Every Fifth Year Inspection: Recommended for internal inspection of Deluge Valves, strainers, and restricted orifices, unless more frequent inspections are indicated by tests.
Air Supply Maintenance: The air supply must be regulated, restricted, and maintained automatically, with the air maintenance device regulating and restricting supervisory air flow.
Documentation: Requires recording and providing notification of inspection results to the Authority Having Jurisdiction.

Viking VXD Specifications

General

Brand	Viking
Model	VXD
Category	Control Unit
Language	English

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13 pages

Viking VXD - User Manual

Table of Contents

Summary

Introduction

Listings and Approvals

Ordering Information

System Components

System Operation: In the SET condition

In the SET condition

System Operation: In fire conditions

In fire conditions

System Operation: In trouble conditions

In trouble conditions

System Operation: Manual operation

Manual operation

Installation: Important Settings

Important Settings

Installation: Air Supply Design

Air Supply Design

Placing the System in Service

Placing the Valve in Service

Emergency Instructions

Inspections, Tests, and Maintenance: Inspection

Inspection

Inspections, Tests, and Maintenance: Periodic System Tests

Quarterly Water Flow Alarm Test

Quarterly Main Drain Test

Annual Trip Test

Inspections, Tests, and Maintenance: Quarterly Low Air Pressure Alarm Test

Quarterly Low Air Pressure Alarm Test

Inspections, Tests, and Maintenance: Maintenance: After Each Operation

After Each Operation

Inspections, Tests, and Maintenance: Maintenance: Semi-Annually

Semi-Annually

Inspections, Tests, and Maintenance: Maintenance: Every Fifth Year

Every Fifth Year

Dimensions