1. Malema Excess Flow Valves
Confidential

2. Use & Applications
Malema Excess flow valves are used as safety devises to shut-off the flow of hazardous and expensive fluids in the event of rupture caused in downstream piping
Applications: Various fluids used in Oil & Gas, Petrochemical industries, Chemical industries
Confidential

3. M-XF Applications
- Transfer lines in the petroleum and chemical industries
Confidential

4. LPG TRUCK/TANKER LOADING STATIONS
Another most common M-XF application
LPG TRUCK/TANKER LOADING STATIONS
Confidential

5. Design
Confidential

6. How It Works
Poppet position is set for a given flow rate by adjusting the set screw.
During normal operation poppet is open thereby allowing flow through seat.
During the excess flow condition the poppet is closed due to suction effect and the fluid is held back.
Confidential

7. Technical Data
Available Sizes: ¾” to 12” Optional up to 20” Pressure Ratings: ANSI #150, 300, 600, 900, 1500 Optional : Other standards and ratings Material of Construction: Carbon Steel, SS 304, 316, 316L Optional: Hastalloy and Monel Shut off Range: Water: 0.1 to 2500 US GPM Air: 0.5 to SCFM Applicable Standards: Face to Face dimension as per ASME/ANSI B16.10 Flange Dimension as per ASME/AMSI B16.5 Hydro test as per API 598 .
Confidential

8. Testing and Calibration: Testing: Hydro test
Calibration: If factory setting is required the valve
will be calibrated using water flow
rate equivalent to the application
fluid’s shut of flow rate.
Optional testing: Liquid dye penetration
Positive Material Identification
Hydro test as per API 598
Radiography
Confidential

9. Sizing & Selection
Confidential

10. A Typical Installation: By-pass Line Configuration
A reset valve is installed on a by-pass line
To Reset a closed excess flow valve:
Close the isolation valve and
Open valve in bypass line to equalize pressure in the main line
Confidential

11. Malema Excess Flow Valve with built-in Reset
Reset mechanism is integrated to the excess flow valve
Eliminates additional piping and hardware required upstream of the valve
Reduces the cost installation
Confidential

12. Additional Accessories
Excess valve OPEN/CLOSE indication can be provided with a use of differential pressure gauge.
Remote OPEN/CLOSE contact signal can be provided with a use of differential pressure switch. Useful for integrating with safety shutdown systems and other control strategies.
A combination of built-in reset with above features is also available as an option.
Confidential

13. Local On/Off Indication
Local On/Off Indication and integral bypass reset valve
Confidential

14. Benefits Field Adjustable Set Point Easier Reset
Adjustments can be made without removing the valve
Easier Reset
Variety of pressure ratings
Variety of wetted parts to suit the application
Preventive Maintenance Performed in Line
Valve does not have to be removed
Reduces down time
2 Year Warranty
Lower Cost of Ownership
Confidential

15. Excess Flow Valve model M-VF -
Excess Flow Valve model M-VF - for low flow, high/low pressure sample lines, gas supply lines and analyzer panels
Standard Excess Flow Valve
Excess Flow Valve with integral reset option
Confidential

16. Operation
As the fluid (liquid or gas) enters the valve, the pressure differential across the piston creates a venturi effect, accelerating the flow through the valve.
At a preset flow rate, when the differential exceeds the magnetic attraction between the piston magnet and the adjusting screw magnet, the piston travels instantaneously over towards the output port, thereby shutting off the flow.
When the pressure is equalized between both sides of the valve, the piston automatically returns to its previously adjusted flow set-point.
The shut off set point is field adjustable and this is achieved by turning the adjusting screw.
Confidential

17. Various Options: Bleed to Atmosphere
Manual Rest option for non Hazardous medium
Confidential

18. Excess Flow Valve with Intrinsic Reset Option
Suitable for hazardous fluid applications where even a small amount leak to the atmosphere during reset is not permissible.
Confidential

19. Bleed to Sample container
Suitable for costly and hazardous liquids where bleed during reset is directed towards a customer provided container. The integral bleed valve helps achieves this function.
Confidential

20. M-VF FOR GAS CHROMOTOGRAPHS
M-VF can be used in the hydrogen carrier lines which helps hydrogen leaks
Into atmosphere in the event of accidental line rupture.
Confidential

21. Customer Reference List
Glaco Midwest, Inc.
Hoerbiger Corporation of America
Hoidale Co, Inc.
Hyundai Heavy Industries
Hunt Refining Company
JGC Corporation
Lanza, Inc.
Lyondell Chemical Company
Roberts Oxygen Company
Sherwin Williams
Tampa Electric
Trigon Engineering
ADM
BASF Corporation
Bechtel
BMW
CITGO Petroleum Corporation
Caterpillar
Dairen Chemical
Earthsafe Systems, Inc.
Florida Gas Transmission
General Mills Operation, Inc.
Georgia-Pacific
General Electric
Confidential

22. Confidential

23. Our Commitment
A Safety product is bought on trust that the customer has in the product and the company that stands behind it.
Malema’s two decade of experience in manufacturing excess flow valves delivers you a trusted product.
Our engineers will be available to install the first units to train your engineers .
Confidential