Build materials used in the construction of hydraulic quick coupler and pneumatic quick coupling

quick couplings material introduction

Build Materials Quick Connect Couplings

There are so many build materials used in the construction of hydraulic quick couplings, fluid pipe connecting fittings, pneumatic quick disconnect couplings. They can be metals like Aluminum, Brass, Bronze, Cast Iron, Copper, Steel, and Carbon Steel, Stainless Steel. The plastic materials like Teflon (PTFE), PVDF, PFA (fluoropolymers), PVC (poly-vinyl-chloride), Polyethylene (PE), Polypropylene (PP). Along with a large number of quick coupling building materials, there are also a lot of quick coupler types and designs for so many different usages, in different environments, different liquid or air or gas, different pressures, etc. Each quick-connect design works differently to provide safety and performance benefits for the hydraulic, oil, fluid, or gas system. People designed so many different mechanisms according to the build materials spec: Ball Lock Couplings, Roller Lock Couplings, Pin Lock Couplings, Flat Faced Couplings (ideal for limiting spills and drips), Bayonet Couplings, Keg Ball Lock Couplings, Ring lock Couplings, and Cam Lock Couplings. The different materials will be used in different designs to reach the different requirements.

Different Quick Couplings

To determine the best material suited for the system, people will first understand the. specs and rating of the quick coupling, Compare these ratings and limits with parameters for hydraulic, fluid, or pneumatic systems. This includes ranges and limits for temperature, pressure, flow, volume, pressure fluctuations, estimated connection/disconnect cycles, etc. Firstly we can classify the quick couplings into several different usages.

Hydraulic Quick Couplings
  • Hydraulic Quick Couplings and related fittings; Hydraulic quick connect couplings are used to join or separate fluid conductors quickly and without the use of tools or special devices. A high-quality hydraulic quick disconnect coupling will help make system maintenance and machine repair easy while matching the flow and pressure requirements of the rest of the hydraulic system. Pay attention to pressure ratings (hydraulic fittings usually need to meet high-pressure ratings) and flow rates to ensure that the coupling can safely handle system requirements. In addition, consider the viscosity of the hydraulic oil and the temperature of the system, as well as the ambient temperature of the mechanical operation. When choosing a strong enough quick coupling, a sturdy metal quick coupling is usually the best choice because it can withstand extremely high-pressure hydraulic components. (Reference; ISO DIS 13031 – Earth-moving machinery – fast couplers – Safety BS ISO 5675 – Agricultural tractors and machinery – General purpose fast hydraulic couplers.)
    Pneumatic quick coupling
    Pneumatic quick coupling
  • Pneumatic quick couplings and fittings: Flow rate is the most important compressed air accessory. These are considered the main working parts of the air supply line and will receive more use than almost any other hose or fitting built into the compressed air supply line. Choose a material that is durable enough to be used in heavy industrial/manufacturing environments.
  • Chemical quick connect fittings – Chemical fast disconnect couplers must resist potentially corrosive substances such as fuels, oils, solvents, acids, and strong bases. For chemicals, always check the chemical compatibility of quick-connect plastics and/or metals, as well as fluids, oils, or gases used in the system.
  • Gas quick-connect fittings – The integrity of the gas quick connection is critical. For systems dealing with flammable gases, seals and connectors between quick-connect connectors must conform to the strictest tolerances to ensure that gases do not escape/leak from the connectors. Propane quick couplings and natural gas couplings must be manufactured to the highest safety and quality standards. To avoid gas leakage in quick couplings, high-quality materials and seals are used to ensure the safety of users and others.
  • Food-grade quick connects fittings – Food-grade quick couplings must maintain fluid, liquid, and gas sanitary properties for use in the food, beverage, medical, and pharmaceutical industries. It is also important that the quick coupling material does not excrete gases or introduce chemicals directly through contact, flow, fluid, or gaseous chemical reactions in the system.
    Stainless Steel 316 For food industries
  • Water quick connect fittings – Water quick connection must ensure that drinking water is not contaminated. Typically, these systems work under less pressure than some of the others listed, and the water in these systems will be used for industrial manufacturing, municipal use, and potentially for consumption by the general public. For these reasons, quick couplings must be free of potentially dangerous chemicals, as well as foreign objects and contaminants that could damage industrial equipment or products.

Metals for quick couplings

Metal quick couplings are stronger than plastic, respond better to higher temperatures than plastic quick couplers, and withstand increased pressures and pressure fluctuations better than plastic quick couplers and fittings.

  • Aluminum quick connects couplings – Aluminum quick connection coupling is lightweight and corrosion-resistant. Aluminum fittings are generally cheaper than other metal quick-connect couplings, but are more likely to scratch, and wear when not alloyed with other metals; Zinc, copper, silicon, or manganese to improve strength and increase hardness.
  • Brass quick connects couplings – Brass quick connection couplings (copper and zinc alloys) are strong, durable, corrosion-resistant, and do not negatively react/interact with copper or zinc pipes. Brass has high electrical conductivity and is durable at high temperatures. These properties make brass a very popular material for making quick couplings. In addition to its ability to withstand heat, it is also favored by manufacturers because it is easier to use and process than some other metals.
    B8600 ISO B Brass Material Quick disconnect Coupling
    Brass Quick Couplings for chemical fluids
  • Bronze quick connect couplers – Bronze quick-connect couplings (alloyed copper and tin) are harder but more brittle than brass quick-connect couplings. Bronze fittings are highly resistant to corrosion, remain tough and durable in high-temperature hydraulic systems, and hold up well in salt and brine environments. Bronze (like brass) is preferred over stainless steel for quick connection couplers when welding or welded connections are used.
  • Cast Iron quick couplers – Cast iron is less popular with quick-connect manufacturers. More commonly, cast iron is found in supplemental system components such as fluid traps, flanges, pipes, exhaust pipes, and waste removal. Cast iron is beneficial in wastewater systems because it resists abrasion by abrasive debris and solid waste/wastewater.
  • Copper – Copper quick-connect components provide superior corrosion resistance. Copper is preferred for many plumbing applications because of its flexibility and workability. When used for quick couplings, the copper is work hardened, making it rigid and less prone to wear than when used in a softer state.
  • Steel and Carbon Steel – Steel fittings and carbon steel quick-connect couplers and fittings are very hard and elastic (made from a mixture of iron and carbon). Stainless steel and carbon steel quick couplers are more resistant to damage than soft metals such as brass and copper. Steel quick-connect fittings also have a wider operating temperature range, making them more flexible for stricter applications. Carbon steel fittings are more susceptible to corrosion than stainless steel quick couplings and fittings. In addition to mixed steel alloys, there is also the option of galvanized steel, which is coated with zinc to form a coupling of rust and chemical resistance.
  • Stainless Steel – Stainless steel quick-connect fittings are in high demand for handling and handling corrosive chemicals and other potentially corrosive liquids, oils, and gases due to their flexibility and durability. If you are looking for the best pressure ratings, high-temperature functionality, and corrosion resistance, look for stainless steel quick-connect accessories.

Plastic Material for quick couplings

Plastic is a lower-cost material, thus providing consumers with a cheaper option for quick-connect accessories. Plastic quick connections and fittings do not rust, making them less likely to jam or close the valve. They are also lighter, thus reducing transport costs. Be especially careful when installing plastic quick-connect couplers. Tight valves/piping can compromise the integrity of plastic quick-connect bodies, valves, flanges, and seals.

Plastic Quick Couplers
  • Teflon (PTFE) – Teflon quick-connect couplers have the chemical resistance of a smooth, non-sticky surface that contributes to steady flow rates and helps eliminate media buildup. The Teflon fitting has a low friction coefficient and good dielectric properties. Teflon fittings are chemically inert and work well in chemicals, corrosive liquids, oils, drinking water, and compressed gases.
  • PVDF connections – PVDF connections, piping, and fittings are economical alternatives to PTFE (Teflon), PFA, and FEP. Kynar accessories and connection options for cryogenic fluid and gas applications.PVDF fittings are generally very resistant to chemical degradation and can handle high-temperature fluids and gases better than other plastic fittings. Compared with polypropylene accessories, PVDF has better acid and solvent resistance.
  • PFA (fluoropolymers) – PFA fittings, couplings, hoses, and pipes are popular for handling corrosive chemicals. They are used as liners for chemical containers to prevent erosion in gas scrubbers, reactors, containment vessels, and pipelines.PFA piping and fittings can withstand prolonged exposure to corrosive surfactants and chemicals.
  • PVC (poly-vinyl-chloride) – PVC fittings and couplings are popular in chemical processing, industrial electroplating, chilled water distribution/transfer, deionized water lines, chemical drainage and wastewater treatment systems.PVC fittings are rigid and come in a variety of pressure grades.
  • Polyethylene (PE) – Polyethylene is a strong thermoplastic. PE couplers, quick couplings, fittings and pipes have excellent electrical properties but cannot withstand high temperatures.PE pipe fittings have good chemical compatibility, but are easy to produce stress cracks.Other problems plaguing PE accessories are poor uv resistance and poor barrier performance.PE fittings are popular in water delivery systems that do not experience pressure or temperature fluctuations.
  • Polypropylene (PP) – Quick connections made from a thermoplastic material called PP(polypropylene) are good choices for cold flow applications. They have similar properties to PVC, but are more versatile and durable. Unlike PVC, they can be used in exposure applications due to their resistance to UV, weathering and ozone damage.

As a hydraulic quick coupling manufacturer, Our products are usually used in hydraulic applications, and we only supply metal material quick couplings directly. The plastic quick couplings usually will be produced from our cooperators in our city. Most of our quick couplings will be used on hydrualic tools, agriculture and forest machinery, fluid transport like chemical materials, etc. so our materials usually choose carbon steel, brass and stainless steel. And other materials, will be chosen by some customers as customized items.

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