3 994HMB-GPM

Item Number: 0437808
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$18,686.26
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Type: Hydrant Meter Backflow Preventer
  • Weight: 140.0 lb
  • Sizes: 2 1/2" - 7 NST x 3"
  • Body Material: 300 Series Stainless Steel
  • Maximum Operating Pressure: 150 psi
  • Maximum Intermittent Flow: 660 gpm
  • Connections: 2 1/2" - 7 NST fire hose threads
  • Adjustable built-in support leg
  • Portable and lightweight design: 66 lbs.

Description

The Watts Series 994HMB Portable Hydrant Meter Backflow Preventer with a gallons per minute meter is designed to measure potable water flow from fire hydrants while preventing backflow contamination. Featuring a 300 Series stainless steel backflow preventer body and Noryl® check assemblies, this unit ensures corrosion resistance and reliable performance. It connects via 2 1/2" - 7 NST fire hose threads and can handle a maximum operating pressure of 150 psi with intermittent flow up to 660 gpm. Its portable, 66 lb design includes an adjustable support leg and is factory assembled for immediate use. Item number 0437808.

Help Me Connect

The Watts Series 994HMB Hydrant Meter Backflow Preventer is designed for non-permanent installations, such as directly connecting to a fire hydrant. The 2 1/2" - 7 NST swivel connector allows for fast and easy attachment to a compatible fire hydrant. The outlet side typically connects to a 3 inch hose or piping. Ensure local authority approval for health hazard cross-connections prior to installation.

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Additional Details

The Watts Series 994HMB Hydrant Meter Backflow Preventer with a gallons per minute meter is designed to accurately measure potable water flow from a fire hydrant or other non-permanent installation while protecting the water supply from possible contamination. This portable unit prevents backflow from fire protection substances or non-potable water from entering the potable water system due to backsiphonage or backpressure.

Features

  • Backflow preventer made from 300 Series stainless steel for corrosion resistance
  • Heavy duty relief valve cover prevents vandalism and protects the relief valve during transport
  • In-line flow restrictor protects the meter measuring element and backflow preventer components from damage
  • Portable, lightweight design (66 lbs.) for easy transport between job sites
  • Accurately measures flow and protects the water supply from possible contamination
  • Built-in support leg is adjustable in the field for stability
  • Factory assembled and tested; eliminates leaks and improper assembly
  • Designed for long-term service with minimal maintenance and no special tools required for servicing
  • Torsion spring check valves provide maximum flow at a low pressure drop

Materials

  • All Internal Metal Parts: 300 Series Stainless Steel
  • Main Valve Body: 300 Series Stainless Steel
  • Check Assemblies: Noryl®
  • Shutoff Valve: Brass
  • Relief Valve Guard: 300 Series Stainless Steel
  • Meter Housing: Heat treated aluminum alloy
  • Nose Cone and Straightening Vanes: Thermoplastic
  • Rotor: Thermoplastic
  • Rotor Radial Bearings: Lubricated thermoplastic
  • Rotor Thrust Bearings: Sapphire jewels
  • Rotor Bearing Pivots: Passivated 316 stainless steel
  • Calibration Mechanism: Stainless steel and thermoplastic
  • Flow Restriction Orifice: Heat treated aluminum alloy
  • Magnet: Ceramic
  • Register Cover: Bronze
  • Trim: Stainless steel
  • Inlet Screen: Stainless steel with elastomer

Specifications

Performance

  • Typical Operating Range (100%±1.5%): 5 to 660 gpm (1.1 to 150 m³/h)
  • Maximum Continuous Flow: 450 gpm (102 m³/h)
  • Maximum Intermittent Flow: 660 gpm (150 m³/h)
  • Typical Low Flow (Min. 95%): 4 gpm (0.9 m³/h)
  • Pressure Loss at Maximum: 37 psi @ 450 gpm (2.6 bar @ 102 m³/h)
  • Continuous Operation: 23 psi @ 350 gpm
  • Maximum Operating Pressure: 150 psi (10.3 bar)

Connections

  • Standard Hose Coupling: 2 1/2" - 7 NST threads
  • Connector Type: National Standard thread fire hose coupling

Materials

  • Internal Metal Parts: 300 Series Stainless Steel
  • Main Valve Body: 300 Series Stainless Steel
  • Backflow Preventer Body: 300 Series Stainless Steel
  • Check Assemblies: Noryl®
  • Shutoff Valve: Brass
  • Relief Valve Guard: 300 Series Stainless Steel
  • Meter Housing: Heat Treated Aluminum Alloy
  • Rotor Thrust Bearings: Sapphire Jewels

Dimensions & Weight

  • Overall Lay Length: 37 1/2"
  • Weight: 66 lbs. (30 kgs)
  • Height (top of open gate valve to bottom of relief valve): 19" (483mm)
  • Width: 10" (254mm)

Certificates & Approvals

  • Meets design requirements of most national standards

FAQs

What is the primary purpose of the Watts 994HMB Hydrant Meter Backflow Preventer?

Its primary purpose is to accurately measure potable water flow from a fire hydrant or other non-permanent installation and prevent backflow of non-potable substances or contaminated water into the potable water supply.

What are the connection sizes for this hydrant meter backflow preventer?

This unit features a 2 1/2" - 7 NST (National Standard thread) fire hose coupling for connection to a fire hydrant and a 3" outlet.

Is the Watts 994HMB unit portable?

Yes, it has a portable, lightweight design weighing 66 lbs. and includes a built-in adjustable support leg, making it easy to transport and set up between job sites.

What materials are used in the construction of the backflow preventer component?

The backflow preventer component is made from 300 Series stainless steel for corrosion resistance, with Noryl® check assemblies and a brass shutoff valve.

What is the maximum operating pressure and flow rate for this device?

The device has a maximum operating pressure of 150 psi and can handle a maximum intermittent flow of 660 gpm (150 m³/h).

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