Name: RCM Flo-Gage™ Flush / Purge Flow Meters
Brand: RCM Industries
Availability: InStock

Question 1

What makes the Flush/Purge meter different from a standard Flo-Gage?

Accepted Answer

The Flush/Purge meter is built on the same rugged 7000/8000 Series platform but adds an integrated equalizing valve and 3-way ball valve. This allows operators to flush fluid from the pressure ports, drain the bellows chamber, and winterize the meter — all without removing it from the pipeline. It is ideal for applications where the process fluid can solidify, freeze, or leave deposits.

Question 2

What fluids is the Flush/Purge meter designed for?

Accepted Answer

Typical applications include water and process water systems, latex-modified concrete batching, water-soluble paints and coatings, chemical and additive injection systems, seasonal or outdoor systems requiring winterization, and industrial processes with solids or buildup risk. The flush/purge capability is especially valuable for fluids that can solidify or clog the meter internals.

Question 3

Can the Flush/Purge meter be used outdoors or in freezing conditions?

Accepted Answer

Yes — this is one of its primary use cases. The integrated 3-way ball valve allows you to drain the bellows chamber and pressure ports before temperatures drop below freezing, preventing ice damage. After winterization, the meter can be re-commissioned by reversing the procedure.

Question 4

What pipe sizes and connection styles are available?

Accepted Answer

The Flush/Purge meter is available in ¼″ to 8″ pipe sizes. Series 7000 uses threaded FNPT connections (¼″ to 3″); Series 8000 is wafer-style, mounting between 150 or 300 class flanges (½″ to 8″). Both are available in Bronze or 316 Stainless Steel.

Question 5

How do I flush the meter?

Accepted Answer

To flush the pressure ports, operate the 3-way ball valve to direct flush fluid through the ports. The equalizing valve allows you to equalize pressure across the meter before switching the ball valve, preventing pressure spikes. Refer to the instruction manual for the specific valve sequence for your installation.

Question 6

How do I winterize the meter?

Accepted Answer

Close the isolation valves upstream and downstream of the meter. Use the equalizing valve to equalize pressure, then operate the 3-way ball valve to drain the bellows chamber and pressure ports. Verify the chamber is fully drained before temperatures drop below freezing. Re-commission by reversing the procedure in spring.

Question 7

What seals are available and which should I choose?

Accepted Answer

Standard seals are Buna-N, suitable for water, oils, and many common process fluids. Option A provides Viton seals for better resistance to fuels, solvents, and higher temperatures. For latex or paint service, Buna-N is typically acceptable — confirm compatibility with your specific fluid before ordering.

Question 8

What accuracy does the Flush/Purge meter provide?

Accepted Answer

The Flush/Purge meter provides ±3% of full scale accuracy with ±1% repeatability — the same as the standard Flo-Gage. The 6:1 turndown ratio means the meter reads accurately from 15% to 100% of full scale.

Question 9

How do I select the right flow range?

Accepted Answer

Select a flow range so that your normal operating flow falls in the upper half of the scale (60–90% of full scale). For best accuracy, avoid selecting a range where normal flow is below 30% of full scale. Use the standard flow range tables on this page to find the closest available range for your pipe size.

Question 10

Can I get a non-standard flow range?

Accepted Answer

Yes — Option E provides a non-standard flow rate calibration. Option ES provides low flow rates below 2 GPM (available on ½″ 7000 Series only). Contact Northeast Controls with your required flow range for a custom calibration.

Component	Standard	Options
Housing	Polycarbonate	Aluminum
Body	Bronze / 316 SS	—
Bellows	Bronze / 316 SS	—
Seals	Buna-N	Viton
Crystal	Polycarbonate	Glass / Plastic
Gear Movement	Bronze	316 SS

Section	Description
Pipe Size	Meter size (¼″ to 8″)
Series	7000 = Threaded (FNPT) · 8000 = Wafer (flanged)
Material	Bronze (1) or Stainless Steel (3)
Flow Direction	L, R, VUR, VUL, VDR, VDL
Flow Rate	Full-scale GPM — refer to flow rate tables
Options	Option codes — refer to options table

Code	Material
1	Bronze
3	Stainless Steel (SST)

Code	Description
L	Right to Left
R	Left to Right
VUR	Vertical Up Flow, Dial Right
VUL	Vertical Up Flow, Dial Left
VDR	Vertical Down Flow, Dial Right
VDL	Vertical Down Flow, Dial Left

Code	Description
A	Viton Seals
C	Calibrated for Specific Gravity
D	Gasketed Case
E	Non-Standard Flow Rate
ES	Low Flow Rate (Below 2 GPM)
F	Aluminum Housing with Plastic Dial Crystal
F2	Aluminum Housing with Glass Dial Crystal
P	Panel Mount

Flush / Purge Flow Meters

Features & Benefits

Typical Applications

Principle of Operation

Performance & Ratings

Specifications — Materials of Construction

Model Number System

Material Codes

Flow Direction Codes

Available Pipe Sizes

Table of Options

Standard Flow Ranges

Low Flow Rates — Option ES

Dimensions — Face-to-Face Length

Piping Requirements

Flush / Purge Flow Meter FAQ

Application & Selection

Operation & Maintenance

Sizing & Accuracy

Select a Product

GPH	l/h	cc/m
4	15	200
6	20	300
10	40	400
15	60	600
20	80	1000
30	120	2000
40	150	3000
60	240	4000
100	400	6000

Nominal Size	Series 7000 (Threaded)	Series 8000 (Wafer)
¼″	5.95″ (151mm)	n/a
½″	5.95″ (151mm)	6.62″ (168mm)
¾″	5.95″ (151mm)	7.06″ (179mm)
1″	6.07″ (154mm)	7.25″ (184mm)
1½″	6.39″ (162mm)	7.81″ (198mm)
2″	6.80″ (172mm)	8.00″ (203mm)
3″	7.48″ (190mm)	8.87″ (225mm)
4″	n/a	9.95″ (252mm)
5″	n/a	10.36″ (263mm)
6″	n/a	11.05″ (280mm)
8″	n/a	12.30″ (311mm)

GPM	LPM
2	8
3	10
4	15

GPM	LPM
2	8
3	10
4	15
6	25
10	40

GPM	LPM
6	25
10	40
15	60
20	80