Excess Flow Valve
Manual Reset Series

With integral manual reset for preventing uncontrolled flows of gases and liquids. 



Recognized File E75356 
CE Recognized 2006/95/EC
Click here for additional details and specifications

Positive shut off with internal reset mechanism

Plant Lines

Regulator Failure

Fitting Failure

Toxic Gases and Liquids

Gas distribution systems

Gas Analyzers

Loss Control

Features
  • Field Adjustable
  • Resets Manually
  • Materials: 316ss or Brass Body Standard
  • Detects Excess Flows
  • Detects an Increase in Viscosity of Media
  • Function: Shuts Off Flow
  • Output: Switch Contact (Optional)
Operation

Flow enters the unit and makes a right angle to the outlet port across the nose of a magnetic piston. The piston is held in place by attraction to an adjusting screw magnet. A pressure differential is created by flow across the piston. When the differential is great enough, the piston slides to a seat at the outlet port. The flow rate at which the piston actuates can be changed externally by turning the adjusting screw, thereby changing the piston's relationship with the flow stream.

The piston makes a bubble tight seal when it comes in contact with the seat. To reopen the unit, turn the balancing valve handle on the side. This ports the upstream pipeline to the downstream pipeline. When the pressure is equalized on each side of the piston, it will reset. The unit is returned to normal operation by closing the balancing valve.

  • Actuation points for air at 68° F and 14.7 PSIG.

  • Corrections must be used for other gases, line pressures and temperatures.*

  • Please consult your representative or the factory.
CALIBRATION RANGE
Model Adjustable
Range
Air SLPM (SCFM)		 Adjustable
Range
Water LPM (GPM)		 Port
Size
FNPT
EFV-125 0.5 to 155.70
(0.018 to 5.5)		 0.015 to 4.5
(0.004 to 1.2)		 1/8"
EFV-250 4 to 1132
(0.14 to 40)		 0.100 to 15.1
(0.026 to 4.0)		 1/4"
EFV-375 85 to 1840
(3.0 to 65)		 0.380 to 15.1
(0.100 to 4.0)		 3/8"
EFV-500 142 to 2123
(5.0 to 75) 		1.90 to 37.8
(0.50 to 10.0)		 1/2"
EFV-750 425 to 3681
(15.0 to 130)		 3.80 to 75.7 (1.0 to 20.0) 3/4"


PRESSURE LOSS TABLE

Model Set Point DP to Atmosphere
BARD (PSID)
Air
SLPM (SCFM)		 Water
LPM (GPM)
EFV-125 0.5 (0.018)
75 (2.63)
155.7 (5.5) 		0.015 (0.004)
2.65 (0.70)
4.50 (1.20) 		0.08 (1.2)
0.11 (1.6)
0.21 (3.0)
EFV-250 4 (0.14)
500 (17.50)
1132 (39.62)		 0.1 (0.26)
5.0 (1.32)
15.1 (3.99) 		0.21 (3.0)
0.41 (6.0)
0.83 (12.0)
EFV-375 85 (2.98)
900 (31.50)
1840 (64.40) 		0.38 (0.10)
10.0 (2.64)
15.1 (3.99)		 0.10 (1.5)
0.28 (4.0)
0.83 (12.0)
EFV-500 142 (4.97)
1000 (35.00)
2123 (74.31) 		1.9 (0.50)
25.0 (6.60)
37.8 (9.98)		 0.07 (1.0)
0.28 (4.0)
0.48 (7.0)
EFV-750 425 (14.88)
1800 (63.00)
3681 (128.84) 		3.8 (1.00)
4.7 (1.24)
75.7 (19.98) 		0.14 (2.0)
0.21 (3.0)
0.34 (5.0)

 

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