Malema Excess Flow Valves

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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

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

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LPG TRUCK/TANKER LOADING STATIONS

Another most common M-XF application

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Design

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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.

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Technical Data

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Available Sizes: ¾” to 12” Optional up to 20”

Pressure Ratings: ANSI #150, 300, 600, 900, 1500Optional : Other standards and ratings

Material of Construction: Carbon Steel, SS 304, 316, 316LOptional: Hastalloy and Monel

Shut off Range: Water: 0.1 to 2500 US GPMAir: 0.5 to 40000 SCFM

Applicable Standards: Face to Face dimension as per ASME/ANSI B16.10 Flange Dimension as per ASME/AMSI B16.5Hydro test as per API 598 .

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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

Sizing & Selection

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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

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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

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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.

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Local On/Off Indication

Local On/Off Indication and integral bypass reset valve

Benefits Field Adjustable Set Point

– 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

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Excess Flow Valve model M-VF

- for low flow, high/low pressure sample lines, gas supply lines and analyzer panels

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Standard Excess Flow Valve

Excess Flow Valve with integral reset option

Operation

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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.

Various Options: Bleed to Atmosphere

Manual Rest option for non Hazardous medium

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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.

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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.

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M-VF FOR GAS CHROMOTOGRAPHS

M-VF can be used in the hydrogen carrier lines which helps hydrogen leaksInto atmosphere in the event of accidental line rupture.

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Customer Reference List 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

• 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

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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 .

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