Products Presentation

Three traditional methods to connect steel pipes, namely welding, flange connection and screwconnection.

Grooved piping system use the grooved couplings & branch outlet fittings as the key,supplemented by a variety of non-gasket pipefittings, This is a pipe connection revolution. Atpresent, CNG manufactures all kinds of grooved branch outlet fittings and non-gasket fittings. Inorder to meet the needs of customers, CNG also developed extended products such as groovedend valves, filters, etc. CNG will continue to improve and optimize so that the company'sproduct line can fulfill demands in civil construction, municipal and industrial fields..

Groove piping system is an universal, economic, safe and practical piping systemcomponents, the installation process will not bring any pollution to the pipeline. lt is an
environmentally friendly green product.

Groove piping system builds pipe connection on the external surface of steel pipes. Theinner diameter & interior surface of the pipe has no matter of the connection, which makes therange of application of this product much more extended.

Products Strong Point

Compared with the traditional piping methods such as welded, flanges or threaded connection,the grooved and mechanical outlet fittings has very significant advantages, mainly in thefollowing aspects:

	◆ Rigid ⊙ Rigid coupling providesenough rigidity to resisttube twisting and bendingmoment.
	◆ Noise and vibration ⊙The separation betweenpipe ends reduces thetransmission of noise andvibration,provides theentire system a significant dampening effect.
	◆ system maintenance ⊙System unit can bedisassembled without movingthe pipeline, thus facilitatingsystem maintenance and modification.
	◆ Flexibility ⊙ Flexible coupling providesradial and axial deflection.It absorbs expansion,contraction,deflection andvibration.
	◆ Earthquake stress ⊙ The full circumferential engage between couplings keys and pipe groovesprovides sufficient internal pressure and pipe end load capacity to withstand pipe movement.
	◆ Easy alignment ⊙ Groove system allows free rotation of pipe and system components prior final fixing.

Warning

Before attempting to install, disassemble, and adjust any CNG product,please depressurize anddrain the plumbing system. Failure to do this may result in personal injury, property damage, leaksand/or other potential function failure.

Products Component

● Housing

Material：Ductile cast iron conforming to ASTM A-536, Grade 65-45-12.

Surface Finish：Standard：Epoxy powder coating

Optional：Galvanized (Zinc Plated、HDG), Dip painted

Surface Color：Variable colors for choice

● Rubber Gasket

Standard: EPDM.

Optional：Nitrile, Silicone, Fluoroelastomer, Neoprene

The sealing mechanism of grooved couplings and mechanical outlets is basically the same,the main structure of the gasket has "C" shape, forming a triple seal function. The first seal is formed by the elasticity of the gasket during the static state. After the coupling is installed,the gasket is confined by the housing of groove coupling or the mechanical outlet, the second seal is formed. Medium inside the pipe system press the "C" cavity after pressurizing, it increases the adhesion between gasket lip and steel pipe surface, so as to achieve the third reactive seal. The greater the pressure of the fluid within the pipe, The better the sealing of the coupling.

The material of the gasket must be chosen to follow the characteristics of the fluid medium below. The commonly used gasket are shown in the following table:

◆ As the manufacturer and innovator of grooved coupling technology,  offers a variety of coupling sizes and styles for almost any piping application.

◆ All grooved couplings are made up of four parts,namely housing, gasket, bolt and nut. Housing is made of ductile iron, surface finish is orange, but also for a variety of fluid piping system to provide matching color scheme; standard gasket material is EPDM,also prepared for a variety of pipeline media rubber material. The bolt's tensile rating is class 8.8 and the nut's rating 8.0.

◆ CNG couplings provide pipe system with versatility not found in other pipe connection methods. CNG rigid and flexible couplings can be combined to allow for thermal growth within the system. Additionally, the use of three consecutive flexible couplings reduces noise and vibration and eliminates costly noise dampeners.

Style 321 split flange mainly use for the flange connection with the valve,equipment or pipe conversion connection to solve the groove connection and flange connection conversion，installation is simple and fast.

Model 321 split flange's bolt holes designed into oval hole.ANSl Class 125 &150 and PN16 grade flanges are universally available, with DN50 to DN80(2"to 3”)for both PN10 and PN25 nominal flanges; DN100 to DN150(4”to 6" )for both flanges PN10 nominal grade flange.

In addition to the standard flanges described above, it is also available to provide flanges under other standards such as JlS 1OK and ANSl Class300.