PREVOST hose connectors Germany PREVOST models PREVOST prices

PREVOST hose connectors are pipe fittings and pipeline connectors. Also known as tee fittings, three-way pipe fittings, or tee joints, they are used where branch pipes diverge from the main pipeline. A tee is a chemical pipe fitting with three openings: one inlet and two outlets, or two inlets and one outlet. It comes in T-shape and Y-shape configurations, with equal-diameter or reducing ports, used at junctions where three identical or different pipelines converge. The primary function of a tee is to change the direction of fluid flow.

PREVOST hose connector material classification

High-pressure tees. There are two common types of high-pressure tees: welded high-pressure tees and integrally forged high-pressure tees. Welded high-pressure tees use high-quality high-pressure steel pipes as material. The manufacturing method is similar to cutting a hole for branch connection; the hole opened on the main pipe must match the diameter of the connected branch pipe. Strict welding quality is required, typically involving preheating before welding and heat treatment after welding. Their specifications and pressure ranges are similar to those of high-pressure elbows. Integrally forged high-pressure tees generally use threaded flange connections. Their specification range is DN12~DN109mm. The service temperature for 25# carbon steel high-pressure tees is below 200℃, and for low-alloy and stainless acid-resistant steel high-pressure tees, it is below 510℃. The operating pressure is below 20.0MPa. There are 3 common types of welded tee pipes: elbow type, right-angle type, and flat-welded port type. 1) Equal-diameter elbow welded tee: Commonly known as a "pants" pipe, it is made by cutting off half the circumference of the outer arm from two 90° elbow pipes, then butt-welding the remaining two elbows together to form an equal-diameter tee. 2) Right-angle tee fabrication: Available in equal-diameter and reducing types. During fabrication, development drawings are created based on two intersecting cylindrical surfaces. Cutting is typically performed using an oxy-acetylene flame cutter, followed by welding. 3) Flat-welded port tee: This type has short weld seams, minimal deformation, saves pipe material, and is easy to process. The manufacturing method involves cutting an elliptical hole in a straight pipe, where the minor axis of the ellipse equals 2/3 of the branch pipe's outer diameter, and the major axis equals the branch pipe's outer diameter. The pipe walls on both sides of the elliptical hole are then heated to approximately 900℃ and flanged outward to form a circular opening.

PREVOST hose connector manufacturing process

It includes a sealing ring, a connecting part, and a union nut for connecting pipes. Therefore, the sealing ring is designed as a ring cutter with one or more cutting edges. By screwing the union nut onto the connecting part, the ring cutter can be inserted into the cavity of the connecting part, which has a conical surface. The outside of the sealing ring has an annular reinforcement on the nut side. This annular reinforcement forms an annular surface at its transition zone towards the narrow ring section. The inclination of this annular surface, formed by the reinforced part of the ring cutter, relative to the pipe axis is 45°-90°. When fully assembled, the axial length of the annular reinforcement allows a transfer element located on the annular surface to imprint its own negative image structure or itself onto the end face of the connecting part. The transfer element has a three-dimensional profile, whose negative image can be transferred onto the surface of the connecting part. Similar to die pressing, the assembler applies pressure to imprint the negative image onto the surface of the connecting part.

PREVOST hose connector applications

Pipe fittings are connection tools between pipes and are detachable connection points between components and pipes. They play an indispensable role in pipe fittings and are one of the two main components of hydraulic piping. Pipe fittings are used for straight connections in instruments, etc., with connection forms including socket welding or threaded connections. They are mainly used for small-diameter, low-pressure pipelines, for parts requiring frequent assembly and disassembly, or as final adjustments for pipelines using threaded fittings. The structural form should preferably adopt metal-to-metal contact sealing. Gasket sealing structures are typically used in general pipelines transporting water, oil, air, etc., and are manufactured from malleable cast iron. In addition, usage requirements and price are factors considered during selection. Pipe fittings come in many varieties; commonly used pipe fittings can generally be divided into hard pipe fittings and hose fittings. If classified by the connection method between the fitting and the pipe, hard pipe fittings include flare-type, compression-type, and welded types, while hose fittings are primarily crimped hose fittings. The connection methods for pipes and fittings in hydraulic systems also vary; the pipe insertion end uses connection threads. Tapered threads rely on their conical body tightening and sealing materials such as PTFE for sealing operations, mainly applied in medium and low-pressure hydraulic systems. Fine-thread sealing is very effective and is often used in high-pressure systems, but it requires combination washers or O rings for end-face sealing. Copper washers are sometimes used, which are more suitable for pipes with thicker walls. Its main components include the fitting body, tailpiece, and nut. During use, the fitting body is embedded into the target, and the aforementioned washers are used to seal the end face. Rubber sealing is used between the fitting body and the tailpiece, and spherical sealing is sometimes employed. Since pipe fittings are detachable connection elements, in addition to meeting requirements for normal connection stability, strong sealing, reasonable dimensions, low pressure loss, and good manufacturability, they must also meet the requirement for convenient assembly and disassembly. Therefore, do not underestimate these small pipe fittings, as only their existence supports the entire hydraulic system.

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