Secondary operations and value-added finishing for assemblies: surface conditioning, powder and wet coatings, post-bond protective finishes, and product-level assembly/kitting. Integrated process control, low-temperature cures for rubber-metal assemblies, and lot-traceable records ensure durability and cosmetic specification. Offers end-of-line functional and leak testing plus custom packaging to deliver installation-ready skids and components.

Coating Processes apply protective or functional films to parts to improve corrosion resistance, wear performance, aesthetics, and cleanliness. Typical methods include liquid spray painting, powder coating, dip and flow coating, electrophoretic deposition (e-coat), and dip-spin for fasteners. Processes are executed over properly prepared substrates with defined film builds and cure schedules, and verified per relevant adhesion, hardness, gloss, and corrosion-resistance standards.

Coating Processes

Surface Conditioning prepares surfaces for finishing (e.g. paint, coatings) or to enhance physical properties through sandblasting, buffing, chemical etching, etc. Critical for adhesion, aesthetics, or final surface texture.

Surface Conditioning

Powder Coating is a dry finishing process where a powder material is applied to a metal surface, then cured under heat to form a hard, protective layer. This coating is durable, corrosion-resistant, and available in many colors, making it popular in automotive, appliance, and consumer goods industries.

Powder Coating

Application of corrosion-resistant coatings to metal areas of bonded rubber-metal assemblies after molding, using processes such as e-coat, zinc-nickel plating or powder coating without degrading the rubber interface.

Post-Bond Protective Coating

Assembly & Integration Services encompasses mechanical fastening, ultrasonic welding, heat staking, electronics and hardware integration, sub-assembly kitting, and packaging services to deliver complete assemblies or kits ready for immediate installation or shipment.

Assembly & Integration Services

Secondary Operations & Value-Added Services (Finishing, Coating, Testing)

Custom expansion joints and compensators (rubber and fabric) engineered to absorb axial, lateral and angular movement while containing pressure. In-house elastomer molding and rubber-to-metal bonding produce tailored bellows, sleeves and reinforced fabric joints with controlled spring rates, temperature and chemical resistance. Offers ISO-grade bonding, post-cure ovens, and integrated metal flanges for field-ready assemblies.

Custom rubber components are molded, extruded or bonded parts made from natural rubber, EPDM, silicone, fluorosilicone, NBR, FKM and other elastomers. Processes include compression, transfer, injection molding, rubber-to-metal bonding and lathe-cut gasket production for seals, vibration isolators and wear-resistant parts across a wide spectrum of industries.

Custom Rubber Components

Custom elastomer components formed by compression, transfer or injection molding— including O-rings, gaskets, diaphragms, grommets, bumpers, bellows and complex over-molded geometries—used for sealing, damping, fluid handling and vibration control across automotive, aerospace, medical and industrial markets.

Rubber Molded Parts

Engineering of compression, transfer and injection molds specifically for elastomer processing, including cavity layout, venting, vacuum and stripper-plate mechanisms to deliver flash-free, dimensionally stable rubber parts.

Rubber Mold Design

Full or partial encapsulation of metal substrates with rubber by sequential molding, creating a protective, compliant layer while retaining the structural integrity of the core component.

Rubber Overmolding / Encapsulation

Joining rubber extrusion ends with heat-activated bonding agents and controlled compression to create endless rings or frames that maintain original mechanical properties and environmental resistance.

Vulcanized Splicing

Expansion Joints & Compensators (Rubber/Fabric) - Custom

Precision flexible couplings transmit torque while accommodating misalignment and dampening torsional vibration in rotating equipment. Hardened-steel, stainless and elastomer-insert options paired with dynamic balancing and in-house assembly deliver controllable stiffness and long service life. Custom bore, keyway and hub interfaces, plus optional corrosion-resistant finishes, support pump, compressor and turbine drive trains.

Mechanical elements that transmit torque and motion between shafts and machine elements outside of enclosed gearboxes. Typical scope includes V-belt and synchronous belt drives, roller-chain drives, sprockets and pulleys, flexible and rigid couplings, shaft collars, keyless bushings, gear racks and pinions, along with associated hardware and guards.

Power-Transmission Components

Transforms plate, sheet, bar and tube into finished assemblies via CNC thermal cutting, press-brake forming, roll forming, and MIG/TIG/robotic welding. Materials span carbon steel, stainless and aluminum, delivering frames, enclosures and turnkey weldments ready for machining, finishing or final assembly.

Metal Fabrication & Welding

Mechanical Assembly delivers torque-verified installation of fasteners, snap-fits, and press-fits to build robust sub-assemblies.

Mechanical Assembly

Flexible Couplings & Torque-Transmission Components

Breather and pressure/vacuum vent assemblies that equalize enclosure and reservoir pressures while filtering particulates and resisting liquid ingress. Options include sintered-mesh elements, hydrophobic ePTFE membranes, and threaded or press-fit mounts. Manufactured to defined flow/ΔP curves with material and temperature selections for oils, lubricants and electronics; available with test certificates and leak-validation options.

Low-profile vent plugs and sintered-mesh breathers that equalize pressure while filtering incoming or outgoing air. Prevent ingress of dust or liquids into reservoirs, gearboxes, and electronic enclosures; available with hydrophobic PTFE membranes for splash resistance.

Fine Screen Breather Vents

Pressure / Leak Testing pressurises a component or assembly with air, inert gas, water, or hydraulic oil to verify structural integrity and leak-rate compliance. Methods include hold-pressure decay, differential pressure, and mass-flow measurement, supporting ratings from vacuum to 70 MPa. The process complements helium mass-spectrometer tests for applications where larger or non-hermetic leakage limits apply.

Pressure / Leak Testing

Runs programmed electrical, pneumatic or hydraulic tests on 100 % of finished assemblies to verify performance versus spec before pack-out.

Functional & End-of-Line Testing

Metric and imperial adapters, couplings, barbs, and bulkhead union connectors machined from 303/304/316 stainless steel for miniature fluid and pneumatic lines. Products include NPT-to-UNF transition pieces, press-fit or threaded barb inserts, straight and elbow couplers, and bulkhead feed-throughs that maintain system integrity through panels or enclosure walls. Rated for liquids or gases up to 10 000 psi (70 MPa) and temperatures −65 °C…+260 °C, these fittings provide corrosion resistance and high cycle life in analytical instruments, semiconductor tools, hydraulic test rigs, and medical devices.

Miniature Stainless-Steel Fittings & Bulkhead Connectors

Pressure & Vacuum Vents (Breathers, Vent Plugs) - Filtered

Catalog of precision flow-control components and pipe tees—needle valves, metering and check valves, fixed orifices and welded fittings—designed for accurate metering and leak-tight installation. Offers laser-drilled orifices, calibrated Cv curves, and material options including brass and 316 stainless. Supports oxygen and analytical service cleaning, custom porting and test-certified assemblies for fluid-power, instrumentation and process systems.

Passive, precision components that meter, regulate, block, or condition liquid and gas flow. This family spans micro-scale orifice restrictors (<50 µm), miniature check and needle valves, fixed-rate flow limiters, inline screens/breathers, pneumatic float level controls, and the fittings required to install them. Typical materials include brass, 300-/400-series stainless steels, sapphire, and engineered polymers, supporting media from high-purity gases to aggressive chemicals at pressures up to 10 000 psi. Applications range from analytical instrumentation and medical devices to fuel, hydraulic, and pneumatic control systems.

Flow & Level Control Components

Precision flow-control components regulate gases and liquids with exceptionally fine resolution for hydraulic, pneumatic and analytical systems. Products include miniature needle valves, sapphire orifice restrictors, metering valves, precision regulators and flow-conditioning inserts, all built to maintain stable flow over broad pressure and temperature ranges.

Precision Flow-Control Components

Passive restrictors engineered to deliver a nearly constant flow rate over a defined pressure range. This family covers simple precision inserts, diaphragm-type self-regulating limiters, inline fixed-flow regulator assemblies, and water-conservation modules. Typical media include hydraulic oils, compressed air, inert gases, and potable water at working pressures up to 10 000 psi (70 MPa). Applications range from actuator speed control and drip lubrication to appliance flow limiting and coolant dosing.

Fixed Flow-Rate Orifices

Straight-through unions with panel-mount nuts that pass tubing, hose, or threaded flow lines through walls or enclosure panels while maintaining system pressure integrity. Versions include same-size and reducing unions with integral O-ring face seals or captive gaskets.

Miniature Bulkhead Union Connectors

Flow-Control Components & Tees (Needle, Metering, Orifices)

The UL Listing Mark signifies that a representative sample of a product has been evaluated by UL to nationally recognized safety standards and found to be compliant. The mark covers a wide range of categories including electrical, fire-safety, and mechanical equipment, with ongoing factory surveillance to maintain listing status.

UL Listing Mark (General Product Safety Certification)

FM Approval is a third-party certification issued by FM Approvals that verifies industrial and commercial products meet the rigorous loss-prevention, fire-protection, and property-risk-mitigation standards of Factory Mutual (FM) Global. Approved products are listed in the FM Approved Product Index and bear the 'FM APPROVED' mark.

FM Approval

Heating, ventilation, air-conditioning, dehumidification, and industrial refrigeration systems that ensure precise climate control in commercial, industrial, and specialty facilities. AHRI / ASHRAE performance ratings, EPA refrigerant regulations, and energy-efficiency goals drive design and manufacturing requirements.

HVAC, Climate Control & Refrigeration

The Metraflex Company manufactures precision-engineered piping specialties (expansion joints such as Metraloop®, flexible couplings, VRF expansion joints, and VFD-optimized valves) using fabrication, precision machining and final assembly to control thermal expansion, vibration, and noise in commercial HVAC systems and building climate-control piping networks.

Pipe fittings, valves, fixtures, and ancillary components fabricated to ASME B16 and NSF lead-free standards for commercial, industrial, and institutional water-, gas-, and process-piping systems. Manufacturing emphasizes leak-tight tolerances, corrosion-resistant alloys, and high-throughput machining or molding.

Plumbing & Flow Control

Structural steel, prefabricated assemblies, HVAC modules, and envelope systems supplied to residential, commercial, and infrastructure projects. ASTM / ICC code compliance and BIM-ready data enable efficient, high-quality building delivery.

Construction Products & Building Materials

The Metraflex Company produces machined and fabricated flow-control components—LPD Y-strainers, pump connectors, flexible couplings, and valves—assembled and tested to provide leak-tight, low-pressure-drop plumbing and flow-control solutions for commercial and institutional water and hydronic piping systems.

Equipment and process systems for municipal and industrial water purification, desalination, and wastewater treatment—including filtration, membranes, chemical dosing, and sludge handling. Solutions meet NSF/ANSI 61, EPA discharge limits, and global environmental regulations to safeguard public health and natural resources.

Water & Waste-Water Treatment

The Metraflex Company supplies fabricated and assembled piping products (Metraloop® expansion loops, rubber expansion joints, strainers, and flexible metal hose) and offers delegated-design services to manage thermal movement, flow conditioning, and equipment protection in municipal and industrial water and wastewater treatment installations.

Active and passive fire-protection packages—sprinkler piping, deluge skids, AFFF foam proportioners, CO₂ and inert-gas systems, structural fire doors—designed, fabricated and factory-tested to NFPA, IMO SOLAS and EN 54. Covers on-shore industrial facilities, high-rise buildings and marine/offshore installations.

Fire Protection & Suppression Systems

The Metraflex Company fabricates and assembles fire-protection piping components (riser packages, low-pressure-drop strainers, and wall-penetration seals) with precision machining and quality-controlled assembly so sprinkler and suppression systems maintain reliable flow, reduced noise/vibration, and serviceability under NFPA-style building fire-protection applications.

The Metraflex Company provides fabricated building products and assembled engineered piping solutions (building-joint expansion joints, pipe guides, anchors, and seismic breakaway hangers) manufactured with precision machining and assembly processes to accommodate structural movement, protect piping at building penetrations, and simplify installation for commercial construction projects.

The Metraflex Company is a U.S.-based manufacturer of engineered piping specialty products for commercial HVAC, fire protection and plumbing systems. Since 1958 Metraflex produces expansion joints, compensators, Metraloop® expansion loops, Cablesphere® expansion joints, pump connectors, flexible metal hose, strainers, valves, pipe guides and seismic products. Metraflex offers delegated design/engineering support, technical support services and a national representative network. Select products are CSA/UL listed for gas service and Metraflex has tested products for NSF/ANSI 372 lead-free compliance.

Located in West Town (downtown Chicago), this production facility houses Metraflex's manufacturing, assembly, testing and warehouse operations for engineered piping specialty products including expansion joints, pump connectors, strainers, valves, Metraloop® expansion loops and related piping specialties. The location supports technical/delegated design services and a nationwide representative/distribution network. Facility size not specified on public materials.

Metraflex Production Facility

Manufacturer of engineered piping specialty products for commercial HVAC, fire protection and plumbing since 1958.

Metraflex

Engineered Piping Specialty Products

Secondary Operations & Value-Added Services (Finishing, Coating, Testing)

Processes & Services

Business Entity

Locations & Facilities

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