High-impact Polysulfone Plastic Flow Meter:
The Darhor EV Series variable area flow meters are constructed of high-impact polysulfone plastic to provide a low cost alternative for your flow monitoring requirements. These simple but rugged variable area flow meters contain a minimum number of moving parts, offering reliable and trouble-free flow measurement.
The Darhor EV Series variable area flow meters can be used in applications in which the temperature ranges from 32° F to 250° F (0° C to 121° C). These Darhor flow meters are pressure rated for 325 psi/22.4 bar maximum for liquids and for 125 psi/8.6 bar maximum for air and gases.
Variable area flow meters from the Darhor EV Series can be used for the flow measurement of oil, water, air, and compressed gases. Choose the port size and fitting material depending on your application. Five port sizes are available between 1½ To 2 inches with brass or PVC fittings. Six port sizes are available between ½ To 1 inch with brass, PVC, or stainless steel fittings.
Operating Principle of the Darhor EV Series Variable Area Flow Meters
A precision-molded, sharp-edged orifice forms an annular opening with the metering cone. Flow through the meter creates a pressure differential across the orifice, moving the piston against the spring in direct proportion to the rate of flow. The calibrated spring opposes flow in the forward direction. This spring decreases viscosity sensitivity and allows the flow meters to be used in any position, including inverted. The indicated flow rate is measured by viewing the red indicator line on the piston relative to the pre-calibrated numerical scale, mounted on the outer surface of the transparent body.
Features of the Darhor EV Series Variable Area Flow Meter
No special piping or flow straighteners needed
Easy to install in any position
No electrical connections
Direct reading indication
Relatively insensitive to shock and vibration
Fluid Flow Range female, female, female, female, socket weld
Media brass fitting brass fitting brass fitting brass fitting fitting
Manufactured by Darhor
Polysulfone plastic body, piston, and cone
½ To 2 inch ports
Accuracy within ± 5% full scale
325 psi (22 bar) for oil & water
Up to 250° F (121° C)
0.5-100 GPM (2-380 LPM) for oil & water
Standard calibration:
0.876 specific gravity for oil;
1.0 specific gravity for water
Applications: Water Cooling Systems, Chemical and Water Systems, Reverse Osmosis Systems
|
Model |
Measuring Range |
|
|
|
|
WATER 20C |
AIR 20C |
Thread
NPT
BSPT
BSP
|
Material |
|
GPM |
LPM |
GPM |
LPS |
EV
15
20
25 |
0.5-5
1-7
1-10
1-16
3-18
4-28 |
2-20
4-26
4-35
5-60
15-65
20-100 |
80-320
160-480
240-720
320-1100
480-1250
550-1750 |
5-20
10-30
15-45
20-70
30-80
35-110 |
1/2
3/4
1
|
Brass
S S
PVC |
EV
40
50 |
3-25
5-50
8-80
10-100 |
12-90
20-200
30-280
40-380 |
250-1500
350-2200
450-4500
700-6000 |
15-95
20-140
25-275
45-370 |
11/2
2 |
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