M-VF Series Safety Excess Flow Valves

Product catalog summary

Overview

This document provides technical information on the M-VF Series valves, including operating principles, material versions, calibration ranges, port sizes, applications, installation, maintenance, dimensional drawings, and ordering information. The document also lists corporate contact details for headquarters in Boca Raton (FL), Santa Clara (CA), and Singapore.

Operating Principle

The M-VF Series valves operate based on a piston mechanism with precise flow control capabilities. The valves are designed to maintain consistent flow rates and pressure regulation in various industrial applications.

Material Versions

Brass
316 Stainless Steel

These materials ensure durability and compatibility with different fluids and environmental conditions.

Calibration Range

The valves are calibrated for both air and water flow, with a typical accuracy of ±3%. Specific flow ranges depend on the port size and material.

Port Sizes and Flow Ranges

Port Size (FNPT)	Flow Range (Air, SCFM)	Flow Range (Water, GPM)
NObU	0.0177 - 5	0.00264 - 0.8
NOQU	0.12 - 35	0.0264 - 3.5
^ObU	3 - 60	0.1 - 4
NO_U	5 - 75	0.5 - 10
^OQU	15 - 130	1.0 - 20

Port sizes correspond to different flow capacities, allowing selection based on application requirements.

Applications

Pollution control systems
Regulator protection
Industrial fluid control

The valves are suitable for various industrial environments requiring precise flow regulation.

Installation and Flow Rate Adjustment

Installation guidelines emphasize proper alignment and secure mounting to ensure optimal valve performance. Flow rate adjustment is achieved through calibrated piston settings, allowing fine-tuning within specified ranges.

Maintenance

Regular maintenance includes inspection of seals and piston components. Replacement of O-rings and seals is recommended based on wear, with options for Viton®, Kalrez®, Silicone, and Nitrile materials to suit different chemical compatibilities.

Dimensional Drawings

Detailed dimensional data is provided for all port sizes, including measurements in millimeters and inches. This facilitates integration into existing piping systems and ensures compatibility with standard fittings.

Ordering Information

Ordering codes specify model, material, port size, piston seal type, and optional features such as intrinsic reset and seal materials. Key options include:

Material: Brass (B), 316 Stainless Steel (S)
Port Sizes: NObU, NOQU, ^ObU, NO_U, ^OQU
Piston Seal Types: Positive, Bleed, Intrinsic Reset
Seal Materials: Viton®, Kalrez®, Silicone, Nitrile

Customers can customize valves to meet specific application needs.

Critical Parameters and Limitations

Burst pressure ratings: 1500 psig for brass, 3000-5000 psig for stainless steel
Maximum operating temperature: 149°C (300°F)
Calibration accuracy: ±3%

These parameters define the operational limits and safety margins for the valves.

Catalog excerpts

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Safety Excess Flow Valves • Pollution control • Leak detection • Hydraulic lines • Sampling station operator protection • Regulator protection • Catastrophic failure protection Custom Version Available Malema welcomes the opportunity to apply its flow sensor experience to work for its customers. Please contact the factory for any special requirements; such as ports, extreme temperature and Material Versions Other materials available upon request. Calibration range These ranges are over different valves sizes Port size Corporate Headquarters West Coast Headquarters Asia Headquarters 1060 S Rogers...

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Installation and Flow Rate Adjustment Safety Excess Flow Valves 1. The preferred mounting orientation for the valve is in the horizontal position, although it can be mounted vertically. 2. Turn the adjusting screw fully counter-clockwise. 3. Connect hose or piping to outlet and operate at maximum flow rate (liquid or gas). 4. Turn the adjusting screw clockwise until the valve actuates and shuts off the flow. 5. Turn the flow off. The valve will automatically reset because of its controlled bleed. For positive shut-off models, equalize the presure on both sides of the valves. The valve will reset...

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Safety Excess Flow Valves Dimensional Drawings Corporate Headquarters West Coast Headquarters Asia Headquarters 1060 S Rogers Circle Boca Roton, FL 33487 3350 Scott Blvd Bldg. 43 Santa Clara, CA 95054 10 Ang Mo Kio St 65 Techpoint #02-14 Singapore 569059

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6DIHW\ ([FHVV )ORZ 9DOYHV ZZZPDOHPDFRP Cut Dimensional Drawings ,OOXVWUDWHG LV WKH 6WDQGDUG 09) 0RGHO ZLWK µ SRUWV ,OOXVWUDWHG LV WKH 6WDQGDUG 09) 0RGHO ZLWK µ SRUWV ,OOXVWUDWHG LV WKH 6WDQGDUG 09) 0RGHO ZLWK µ SRUWV Corporate Headquarters 1060 S Rogers Circle Boca Roton, FL 33487 P: (561) 995-0595 F: (561) 995-0622 West Coast Headquarters 3350 Scott Blvd Bldg. 43 Santa Clara, CA 95054 P: (408) 970-3419 F: (408) 970-3426 Asia Headquarters 10 Ang Mo Kio St 65 Techpoint #02-14 Singapore 569059 P: (65) 6482-3533 F: (65) 6484-4231

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Safety Excess Flow Valves O-RING SEAL Illustrated is the Standard M-VF Model with 1/2" ports. O-RING SEAL O-RING SEAL Illustrated is the Standard M-VF Model with 3/4" ports. Ordering Information Corporate Headquarters West Coast Headquarters Asia Headquarters 1060 S Rogers Circle Boca Roton, FL 33487 3350 Scott Blvd Bldg. 43 Santa Clara, CA 95054 10 Ang Mo Kio St 65 Techpoint #02-14 Singapore 569059

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