Metalwork hose fittings Germany Metalwork model Metalwork price

Metalwork hose fittings are straight-through connectors used for linear connections such as instruments. Connection methods include socket welding or threaded connection. They are mainly used for small-diameter low-pressure pipelines, for parts that require frequent assembly and disassembly, or for final adjustment of pipelines using threaded fittings. Relevant products are all listed by Kuaiyiyou. The structural form should preferably adopt a metal face contact sealing structure. The gasket sealing structure is generally used in general pipelines transporting water, oil, air, etc., and is made of malleable cast iron. In addition, application requirements and quotation are also factors to consider when selecting. Hose straight connectors have a wide variety of types. Commonly used hose straight connectors can generally be divided into hard hose straight connectors and soft hose straight connectors. If classified according to the connection method between the hose straight connector and the pipeline, hard hose straight connectors come in three types: flared, ferrule, and welded, while soft hose straight connectors are mainly crimped rubber hose straight connectors. The connection methods between pipelines and hose straight connectors in hydraulic systems also differ; the pipe insertion end uses connecting threads. Tapered threads rely on their conical body tightening and use materials such as polytetrafluoroethylene for sealing operations, and are mainly used in medium and low-pressure hydraulic systems.

Metalwork hose fitting classification

Hydraulic terminology refers to components in hydraulic systems that connect pipelines or mount pipelines onto hydraulic elements. This is a general term for connectors that can be installed and removed within fluid pathways. Main types include: welded, ferrule-type, and flare-type. Connector accessories include: nuts, ferrules, flare cores, flare sleeves, and flare nuts. Types of connectors include: end straight connectors, straight connectors, tee connectors, elbows, connectors with live nuts, hinged connectors, plugs, transition connectors, etc. Composition of double ferrule connectors: front ferrule, rear ferrule, nut. Common materials are stainless steel and copper, with metric, American, and British thread standards. NPT, PT, and G are all pipe threads. NPT is the abbreviation for National (American) Pipe Thread, belonging to the American standard 60 degree tapered pipe thread, used in North America. The national standard can be referenced in GB/T12716-1991. PT is the abbreviation for Pipe Thread, a 55 degree sealing conical pipe thread, part of the Whitworth thread family, widely used in Europe and Commonwealth countries. It is commonly used in water and gas pipe industries, with a taper ratio specified as 1:16. The national standard can be referenced in GB/T7306-2000. G is a 55 degree non-sealing pipe thread, also part of the Whitworth thread family. Marked as G, it represents cylindrical threads. The national standard can be referenced in GB/T7307-2001. Additionally, markings such as 1/4, 1/2, and 1/8 in threads refer to the diameter of the thread size, measured in inches. Industry professionals often use fractions to describe thread sizes, where one inch equals eight parts. Thus, 1/4 inch corresponds to two parts, and so on. G seems to be the general term for pipe threads (Guan). The division into 55 and 60 degrees is functional, commonly referred to as pipe cylinders, meaning the thread is machined from a cylindrical surface. ZG is commonly known as pipe cones, meaning the thread is machined from a conical surface. Most water pipe connectors are like this, marked as Rc in older national standards. Metric threads are expressed by pitch, while American and British threads are expressed by the number of threads per inch, which is their primary difference. Metric threads have a 60 degree equilateral tooth profile, British threads have an isosceles 55 degree tooth profile, and American threads have a 60 degree profile. Metric threads use metric units, while American and British threads use imperial units. Pipe threads are mainly used for connecting pipelines, with tight mating between internal and external threads, available in both straight and tapered forms. Nominal diameter refers to the diameter of the connected pipeline, obviously larger than the major diameter of the thread. 1/4, 1/2, and 1/8 are nominal diameters of imperial threads, measured in inches.

Metalwork hose fitting classification

When not connected: When the sleeve of the female body moves to the other end, the stainless steel balls automatically roll outward. The male body disconnects under the action of the spring force of the valves in both the female and male bodies. The valves of the male and female bodies close respectively, instantly blocking fluid flow. When connected: When the male body is inserted into the female body, the sleeve returns to its original position under the action of the spring. The steel balls roll to lock the male body tightly. At the same time, the valves of the female and male bodies push each other open, allowing fluid flow. The O ring can completely block fluid leakage. Not connected: When the sleeve of the female body is pushed to the other end, the steel balls automatically roll outward, so the male body is removed. Since neither the male nor the female body has valves, fluid flows out. When connected: When the male body is inserted into the female body, the sleeve is pushed by its spring force to the previous position, causing the steel balls to lock. Fluid flows, and the O ring prevents liquid leakage. Not connected: When the sleeve of the female body moves to the other end, the stainless steel balls automatically roll outward. The male body is pushed away by the reaction force of the valve spring, and the valves can automatically close to block fluid flow. When connected: When the male body is inserted into the side of the female body with the sleeve, the valve opens, causing fluid flow. The gasket is pushed back to its original position by the spring force. The stainless steel balls lock to ensure the male/female connection, and the inner gasket can completely block fluid leakage.

Metalwork hose fitting installation

1. Saw off a seamless steel tube of suitable length and remove burrs from the port. The tube end face must be perpendicular to the axis, with an angular tolerance not greater than 0.5°. If the tube needs to be bent, the straight-line length from the tube end to the bending part must not be less than three times the nut length. 2. Slide the nut and ferrule onto the seamless steel tube. Pay attention to the direction of the nut and ferrule; do not install them backwards. 3. Apply lubricating oil to the threads of the pre-assembled fitting body and the ferrule. Insert the tube into the fitting body (the tube must be inserted to the bottom) and tighten the nut by hand. 4. Tighten the nut until the ferrule grips the tube. This turning point can be felt by an increase in tightening torque (pressure point). 5. After reaching the pressure point, tighten the compression nut another 1/2 turn. 6. Remove the pre-assembled fitting body and check the embedding of the ferrule cutting edge. The visible raised band must fill the space at the ferrule end face. The ferrule can rotate slightly but cannot be pushed axially. 7. Final installation: Apply lubricating oil to the threads of the fitting body in the actual installation, and tighten the compression nut with it until an increase in tightening torque is felt. Then tighten another 1/2 turn to complete the installation.

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