Rigid Couplings Provide Rigid Sealing Connection In Pipeline System

Nov 4, 2023 | NEWS

Couplings are a connecting device for connecting pipe fittings with grooves, valves and pipe fittings, and are used to tighten the hoop connection between pairs of quick couplings, generally couplings with gaskets, rubber, silicone and PTFE. It has good performance, high sealing degree and easy installation.

The seals of the parts in the coupling type trench joints are divided into two kinds of rigid couplings and flexible couplings, and the rigid coupling fittings are generally applicable to the fire pipelines. Flexible couplings are generally used in buried pipelines. What is the difference between rigid and flexible couplings?

1. The bayonet of rigid coupling adopts the design of concave and convex yin and yang grooves, the pipeline system connected by rigid coupling is in a rigid state, so that the pipe can not produce axial and tendency displacement.

2. The bayonet of flexible coupling is designed with flat mouth, after connecting the pipe with flexible coupling, the pipe is allowed to have axial displacement and corner, the difference between the two of them is that the pipe fixed by rigid coupling can’t be rotated, while the flexible coupling joint can be rotated.

In this article, YINUO,China will concentrate on the rigid coupling types to introduce buyers to the application and selection of rigid couplings.

Benefits of rigid couplings

Rigid couplings have a grooved seal structure and are therefore threadless rigid coupling.Threadless rigid couplings have the following benefits:

1. Simple structure: Rigid threadless coupling usually consists of several basic components, simple structure, easy to manufacture and maintenance.

2. High attitude stiffness: an important feature of a rigid threadless coupling is that it has a high degree of stiffness, which means that it is able to maintain its initial position, making the transmission more stable.

3. High rotational accuracy: Rigid threadless couplings are able to provide high-precision transmissions, with rotational accuracies that can reach several μm levels.

4. High transmission torque: Rigid threadless couplings are able to withstand large transmission torque and are widely used in machine tools and construction machinery.

Material of rigid threadless couplings

1. Cast iron: cast iron is a common rigid coupling material, because of its low cost, high strength and other characteristics, widely used in small and medium-sized mechanical equipment.

2. Alloy steel: alloy steel has high strength, high toughness, wear resistance and other characteristics, commonly used in the need to withstand high torque and shock load occasions.

3. Stainless steel: stainless steel is usually used in applications with high corrosion resistance, such as medical equipment, food processing equipment, etc.Rigid steel couplings are the most common rigid couplings.

4.Aluminium: aluminium has good thermal conductivity and lightweight characteristics, usually used in light mechanical equipment.

5.Copper: copper has high electrical conductivity and corrosion resistance, usually used in power transmission and electrical equipment.

Different sealing types of rigid couplings

There are three main types of Grooved rigid coupling 3/4 cast iron Coupling YN01: sleeve, flanged and clamped.

Sleeve Couplings:

The sleeve coupling is one of the most widely used and simplest rigid couplings available. It consists of two mutually meshing circular arc gears and the bearings connecting the two.

Flanged couplings:

Flange couplings are two half-couplings with flanges connected to two shafts respectively with ordinary flat keys, and then the two half-couplings are bolted together to transfer motion and torque.

Clamped coupling:

it is composed of two semi-cylindrical clamped shells and the bolts connecting them. It is easy to disassemble and does not require axial movement. Mostly used for shafts with a diameter of less than 200mm. For reliability, a flat key is added in the middle.