M-XF Series Safety Excess Flow Valves
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Safety Excess Flow Valves M-XF Series Field adjustable excess flow valve Features • Can be disassembled for repair or inspection without removal from pipe line • Field adjustable • Broad adjustable range • Meets OSHA requirements for safety shutoff valves • Operates effectively with liquids or gases • In-line flow Note: All LPG tank cars and transport trucks are required by law to have excess flow valves installed. In addition, state LPG regulatory bodies require excess flow valves on all LPG storage vessels, storing products for domestic delivery and consumption. Fuel lines Pollution control Chemical processing Gas and hydraulic lines Petroleum and gas installations Safety Excess Flow Valves Malema’s valves provide instant shut off in the event of a hose break or line failure, preventing the release of hazardous or inflammable products to the area, which can result in a disatrous fire or explosion and untold damage to personel and equipment. Calibration Range * Air: 0.5 to 40,000 scfm Water: 0.1 to 2,500 gpm * These ranges are over different valve sizes. As the fluid enters the valve, it flows through the orifice to the outlet. The orifice and tapered piston create a venturi effect, accelerating the flow through the valve. At a preset flow rate, the pressure differential offsets the spring-loading of the piston and shuts off the valve. Fluid can flow through the valve in either direction; however, the flow will be shut off in the direction indicated on the valve. Specifications Set Point Accuracy: Repeatability: Material Versions * • Bronze • Carbon Steel • Cast Iron • Forged Steel • 316 Stainless Steel * Other materials available on request. Illustrated is the M-XF Model. Adjustment is achieved by means of an externally adjustable screw that positions the pistons closer or farther away from the orifice. Turning the adjusting screw clockwise to reduce the flow area causes actuation at lower preset flows. (ANSI Flanged, FNPT, and Socket Welded port types are available) * Other sizes available on request. malema flow sensors

M-XF Series Installation and Maintenance The mounting position for this excess flow valve is horizontal. These valves can also be mounted vertically; this will change trip settings by approxiamately 15% (this is easily corrected since one can adjust the valve to counter for this change). This valve can be easily maintained in the field without removing it from the pipeline as all the components slide out of the top on disassembly; a special tool is provided for disassembly. Flow Characteristics Pressure Drop (For Class 300 Valves) V a l ve Size Typical pressure drops for class 300 valves...

Safety Excess Flow Valves Adjustment Screw Turns vs. Flow Trip Point Settings [The fo//ow/"ng graphs are included as examples only. They should not be used to calibrate individual valves] (l) Turn = 180" from Seat (1) Turn - ISO' from Seoi (1) Turn = 180" from Seaf ANSI Flange Data I ANSI B 16.5, Class 150 (Steel) Dimensional Drawing

Ordering Information M - XF - 1.00 - SS - 300 - FL - V Va lve Size Conne ction Type Malema Flow Sensors • 1060 South Rogers Circle • Boca Raton, Florida 33487 • 1-800-637-6418 561-995-0595 • Fax (561) 995-0622 • http://www.malema.com • © Copyright 1998 • Catalog # 246 Safety Excess Flow Valves Cut-Away Drawing