Positive Displacement Meters

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 Specifications

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 Warranty Specifications

 

 

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RG3 Positive Displacement Meters

Metering through positive displacement has been an accurate and reliable technology used in many parts of the world for decades.  RG3’s patented Positive Displacement meters are oscillating piston meters.  They register the volume by counting the number of times a chamber of a known volume is filled and emptied.  

Water enters one side of the chamber at the side of a division plate.  Because a higher pressure is present in the upstream side, a rotating piston allows a reciprocating motion forcing the compartment on the left to be emptied as the compartment on the right is filled.   With each rotation of the piston, the same volume of water enters and leaves the measuring chamber.

Positive Displacement technology presents one of the most accurate ways to meter water volumes available.  They are extremely accurate at low flowrates.  Installation orientation does not have any meaningful effect on the performance of a Positive Displacement meter, so it can be installed in any position.  They are also not affected by the velocity profile at the entrance, so piping preceding the meter is not required to be straight to ensure accurate performance.

Features

1. Main Casing and Bottom Plate:   Main casings are made of a copper alloy that meets the latest AWWA C700 standards.  Both Standard Waterworks Bronze and Low Lead Bronze, to meet NSF/ANSI STD 61 certified and the meet the new Federal Low Lead Law.  The serial number is permanently marked on the body, along with the size, direction of flow and manufacturer (RG3).  Bottom plates are available in suitable engineering plastic, copper alloy or cast iron.

2. Register Housings and Lids:  Register housings and lids are made of a copper alloy or also available in a suitable engineering plastic.  The serial number is permanently marked on the lid.  The tamper resistant retaining pin is made of stainless steel.

3. Measuring Chambers:  Measuring chambers are made of suitable engineering plastics to meet AWWA C700 Standards.  The piston has approximately the same specific gravity as water.  All spindles are stainless steel.

4. Strainers: All meters have a strainer installed in the meter. Strainer screens are rigid, snug fitting, easy to remove and have an effective straining area of at least double that of the main-case inlet.

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