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Commonly used pipe fittings and their classification

Date:2024-06-05View:185Tags:pipe fittings,flange,valves,

Commonly used pipe fittings and their classification


Pipe fittings are a general term for parts that play the role of connection, control, direction change, diversion, sealing, support, etc. in the pipeline system. Pipe fittings cover a wide range, and common ones include flanges, unions, pipe clamps, ferrules, throat clamps, tees, etc. What are the main uses of these pipe fittings? How to classify them? Let's take a look at the common pipe fittings knowledge introduced in this article.

Classification by purpose

Flange: a part that connects pipes to each other, mainly used for connection between pipe ends.

Living joint: also known as oil joint, mainly used for matching hardware accessories connection, can be installed in various pipeline interfaces for use.

Pipe clamp: a commonly used accessory in industrial pipeline connection, used to connect a short section of two pipes.

Cutting sleeve: a stainless steel pipe connector, mainly used in mechanical pipeline connection systems such as water treatment and municipal water supply systems.

Hooch clamp: an ideal connection fastener, suitable for fasteners for connecting soft and hard pipes above 30mm, with beautiful appearance after assembly.

Cold-drawn tee: its function is to change the direction of the fluid, and can divide the fluid in the main pipeline into two or three other pipes.

Elbow: A commonly used connecting pipe fitting in plumbing installation, used for connecting at the bend of the pipe and changing the direction of the pipe.

Bend: A set of bending dies are used for bending. Most of the machines, equipment and pipes use bends.

Reducer: Also known as reducer, used for connecting two pipes of different diameters, and divided into concentric reducer and eccentric reducer.

Reducing elbow: Change the diameter of the pipe when making a 90-degree turn. There are hot-push elbows, stamped elbows and welded elbows.

Branch platform: A reinforced pipe fitting used for branch pipe connection, instead of using reducing tees, reinforcement plates, reinforced pipe sections and other connection types.

Tee: Tee is a pipe connector, also called pipe tee or three-way pipe fittings, three-way joints, used at the branch pipe of the main pipe.

Cross: Used to connect four pipes with the same diameter and the same verticality, mainly used for diversion or change of direction.

Gasket: A material placed between two planes to strengthen the seal, a sealing element set between tight covers to prevent fluid leakage.

Raw tape: an auxiliary product commonly used in plumbing installation, used at the connection of pipe fittings to enhance the airtightness of the pipe connection.

Hemp wire: an auxiliary product commonly used in plumbing installation, used to wrap around the thread of pipe fittings, which can play a sealing role and prevent water leakage.

Blind flange: also known as blind flange, the real name is blind plate, which is a connection form of flange, in fact, it is a flange without a hole in the middle.

Pipe plug: refers to an external threaded pipe fitting used to plug the internal thread of the pipe end, including square pipe plug, hexagonal pipe plug, etc.

Head: a component of a container, refers to a component used to close the end of the container to isolate the internal and external media, also known as an end cover.

Welding plug: used to protect some parts of the welded parts that need to be protected or are easily injured or deformed during welding.

Pipe clamp: a pipe fitting used to fix the pipeline, a pipe fitting commonly used in plumbing installation, used to fix the pipeline.

Valve: a control component in the fluid conveying system, with functions such as cutoff, regulation, diversion, pressure stabilization, diversion or overflow pressure relief.

Compensator: It is composed of the bellows and end pipes, brackets, flanges, conduits and other accessories of its working body, and is a compensating element.

Decontaminator: It prevents impurities in the pipeline medium from entering the transmission equipment or precision parts, causing production failures or affecting the quality of the product.

Reinforcement pipe: Reinforcement means to increase strength. It improves the strength of the area by increasing the force-bearing area, and is basically a forging pipe.

Clasp: It is the main retainer for removable denture restoration, made of metal, and mainly plays a role in retention, stability and support.

Tow hook: It refers to the hook on the tugboat for hooking and hanging the towline and facilitating release. It can be divided into spring tow hook, hydraulic tow hook, remote control tow hook, etc.

Lifting ring: It is a kind of industrial lifting device, a device for lifting heavy objects in lifting machinery. Common lifting rings include round lifting rings, pear-shaped rings, etc.

Bracket: The truss supporting the middle roof truss is called a bracket. Generally, a parallel chord truss is used, and its web bar adopts a herringbone system with vertical bars.

Classification by connection method

Welded pipe fittings: pipe fittings connected to pipes by welding, including elbows, flanges, tees, reducers, caps, etc.

Threaded pipe fittings: pipe fittings with threads, commonly used in water and gas pipes, small diameter water pipes, compressed air pipes and low-pressure steam pipes, etc.

Casing pipe fittings: a new type of quick pipe connector with good sealing performance and can be used repeatedly, suitable for pipeline systems of oil, gas and general corrosive media.

Clamp pipe fittings: used to tighten the connection between quick connectors, including clamps, quick connectors, silicone sealing gaskets, chuck blind plates, etc.

Undertaking pipe fittings: a high-pressure pipeline connection fitting formed by round steel or steel ingot die forging blanks and processed by lathes.

Bend-elastic double-melt pipe fittings: pipe fittings with ports of the same size as the pipe to be connected, connected by hot-melt butt welding.

Bonded pipe fittings: pipe fittings connected by solvent-based adhesives, such as PVC plastic pipes, etc.

Rubber ring connection type pipe fittings: composed of pipe fitting body, sealing end cover and sealing rubber ring.

Classification by material

Cast steel pipe fittings: The design thickness of cast steel pipe is large and heavy, its weldability is poor, and the carbon content is high, so the weld needs on-site heat treatment.

Rubber pipe fittings: mainly used for industrial, mining, and civil transportation and suction of liquids and gases, including rubber hoses, rubber sealing pads, rubber grouting pipes, etc.

Cast iron pipe fittings: pipes cast by cast iron, including water supply cast iron pipes, sand mold centrifugal cast iron straight pipes, drainage cast iron pipes, etc.

Stainless steel pipe fittings: including stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel pipe caps, etc.

Plastic pipe fittings: made of synthetic resin as raw material, stabilizer, lubricant, plasticizer, and then extruded. Mainly used for water supply system piping, drainage, exhaust and sewage sanitary pipes, rainwater pipes, wire threading pipes, etc.

PVC pipe fittings: Made of polyvinyl chloride resin, stabilizer, lubricant, etc., they are extruded by hot pressing and can be divided into PVC-U pipes, PVC-M pipes and PVC-O pipes.

Graphite pipe fittings: refers to the combination of impermeable graphite pipes and pipe fittings, which are mainly used to transport corrosive media without metal ion pollution and have good thermal conductivity.

Forged steel pipe fittings: parts made by forging. Forging is forged by impact force, including forged steel flanges, forged steel reducers, forged steel tees, etc.

PPR pipe fittings: including U-shaped pipe clamps, blind valves, equal-diameter tees, flanges, flange iron rings, pipe plugs, etc. PPR key connections are made by hot melting and have high plasticity.

Alloy pipe fittings: made of alloy steel, including alloy tees/crosses, alloy reducers, alloy heads, flanges, etc.

PE pipe fittings: can be used for connections between various soft belts, such as connections between PE pipes, UPVC, steel pipes, etc.

ABS pipe fittings: Made of a resin copolymerized from three monomers: acrylonitrile, butadiene and styrene, it is an engineering plastic with high strength, high impact resistance, high hygiene and high anti-aging properties.


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