PARKER LEGRIS hose fittings German PARKER LEGRIS models PARKER LEGRIS prices

PARKER LEGRIS hose fittings are components in hydraulic systems that connect high-pressure hoses to other high-pressure hoses. Hydraulic pipe fittings can also be classified into hydraulic hoses, high-pressure ball valves, quick-connect fittings, compression fittings, welded fittings, high-pressure hoses, adapter fittings, tee fittings, non-standard fittings, flare fittings, elbow fittings, swivel fittings, quick-connect fittings, stainless steel fittings, and brass fittings.

PARKER LEGRIS hose fitting manufacturing process

includes a sealing ring, a connection part, and a union nut for connecting the tube; therefore, the sealing ring is designed as a cutting ring with one or more cutting edges. By screwing the union nut onto the connection part, the cutting ring is inserted into the bore of the connection part, which has a tapered surface. The outer side of the sealing ring features an annular reinforcement on the nut side. This annular reinforcement forms an annular surface at its transition zone toward the narrow ring section. The inclination of said annular surface, formed by the reinforced portion of the cutting ring, relative to the tube axis is 45°-90°. When fully assembled, the axial length of the annular reinforcement allows a transfer element arranged on said annular surface to transfer its own negative image structure or itself onto the end face of the connection part. The transfer element has a three-dimensional profile, the negative image of which can be transferred onto the surface of the connection part. Similar to die stamping, pressure is applied by the assembler to imprint the negative image onto the surface of the connection part.

PARKER LEGRIS hose fitting applications

Quick-connect fittings, also known as self-locking fittings or push-to-connect sealed fittings, allow securing pipes and fittings through simple operation without tightening nuts or using clamps. They can withstand higher pressures, up to 70Bar or even higher. Flanged ports or straight round pipes in cooling water channels typically require clamps for standard fittings, involving multiple steps and offering limited pressure resistance. With technological advancements, besides self-locking quick-connect fittings, pneumatic quick-connect fittings (automated quick-connect fittings) are better suited for industrial automation production, driven by air pressure. The purpose of using quick-connect fittings is to achieve faster operations; modern mechanized production emphasizes efficiency and reducing operator workload. Their speed is reflected in: easy handling, fewer steps, simple operation, automatic locking, and sealing/disconnection requiring only plug-in and pull-out actions, making them much more convenient than standard fittings.

PARKER LEGRIS hose fitting classification

Classification by pipe diameter: Equal tees have identical dimensions at all connection ends; reducing tees have identical main pipe dimensions, while branch pipe dimensions are smaller than the main pipe. Classification by process: 1. Hydraulic bulging: Hydraulic bulging of tees is a forming process where the branch pipe is expanded through axial compensation of the metal material. The process involves injecting liquid into a tube blank with a diameter equal to that of the tee using a specialized hydraulic press. Two horizontal side cylinders of the press synchronously compress the tube blank. As the blank is compressed, its volume decreases, causing the internal liquid pressure to rise. When the pressure required to expand the branch is reached, the metal material flows along the mold cavity under the dual action of the side cylinders and internal liquid pressure, forming the branch. The hydraulic bulging process for tees allows single-step forming with high production efficiency; it increases the wall thickness of the main pipe and shoulders. Due to the high tonnage equipment required for seamless tee hydraulic bulging, it is mainly used domestically for manufacturing standard-wall tees smaller than DN400. Suitable forming materials include low-carbon steel, low-alloy steel, and stainless steel with relatively low work-hardening tendencies, as well as some non-ferrous metals such as copper, aluminum, and titanium. 2. Hot pressing forming: Hot pressing of tees involves flattening a tube blank larger than the tee diameter to approximately the tee diameter, opening a hole at the branch location, heating the blank, placing it in a forming mold, and inserting a punch for stretching the branch. Under pressure, the blank is radially compressed, causing metal to flow toward the branch and form the branch under the stretch of the punch. The entire process forms the tee through radial compression of the blank and stretching of the branch. Unlike hydraulic bulging, the metal for the branch in hot-pressed tees is compensated by the radial movement of the blank, hence it is also called the radial compensation process. Since the tee is pressed after heating, the required equipment tonnage is lower. Hot-pressed tees have wider material adaptability, suitable for low-carbon steel, alloy steel, and stainless steel; this process is typically used for large-diameter tees with thicker walls. Classification by material: carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon arc welding materials, pvc, etc. Classification by manufacturing method: top-made, pressed, forged, cast, etc.

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