Straight coupling

STRAIGHT COUPLING

کوپلینگ مستقیم

Straight coupling

DN:50-3000 mm | PN: 10-25 bar

The coupling can be used to connect the pipe below or above ground level by observing the following technical specifications. By using the water coupling system, there will be no need for threading , beveling, welding or flanging the pipe end and the problems caused by the contraction and longitudinal expansion in the pipes on this fitting will be eliminated.

DN: 50 - 50
mm
PN: 10 - 10
Bar

Application:

The coupling can be used to connect the pipe below or above ground level by observing the following technical specifications. By using the water coupling system, there will be no need for threading , beveling, welding or flanging the pipe end  and the problems caused by the contraction and longitudinal expansion in the pipes on this fitting  will be eliminated.

Product  features:

  • No need for special tools and facilities for installation
  • Can be installed in any weather conditions and in narrow trenches
  • No need for bonding, welding, beveling and threading pipes
  • High speed installation and assembly
  • Suitable for all types of PVC, GRP, DUCTILE, STEEL, pipes
  • No need to specify the exact position for installation
  • Placing the pipes with this type of coupling along the curved path without using any elbows or bends.
  • Compensation the effects of temperature changes with linear displacement
  • Reducing the need for joints.
  • Suitable for all types of PVC, GRP, DUCTILE, STEEL, pipes
  • No need to specify the exact position for installation
  • Placing the pipes with this type of coupling along the curved path without necessity for an elbow or a bend.
  • Reducing the need for joints

Corrosion Protection:

Electrostatic Epoxy Powder Coating with min 250 µm thickness, certified by reputable international institutions for potable water.

The effect of temperature on the coupling:

The coupling temperature performance depends on the type of rubber gasket (sealing gasket) used in it and can be used up to 100 ° C. The coupling operates at a relatively constant temperature with maximum efficiency. If thermal turbulence occurs, the coupling screws need to be readjusted. Therefore, the coupling cannot be used in places such as central heating with high temperature changes.

Chemical resistance:

The chemical resistance of the coupling is determined by the strength of the metal surface and the rubber material and the inner surface of the coupling.

Pipe Coatings:

Some pipes are covered  with a layer for protection, which increases the outer diameter of the pipe, in which case the coupling can also be used, and to use, it is necessary to chip away a thin layer of the protective coating, The pipes should then be re-painted and ready to be installed for cathodic and corrosion protection  .It should be noted that the protective layer must be  removed  only a short distance from the pipe ends and if protective wires are used for cathodic protection of pipes, Nahrabab Gostar Eshtehard Company is able to provide  suitable couplings with the shape of pipes for use. Therefore, we must be aware of the final diameter of the pipes, i.e   the outer diameter of the pipe plus the thickness of the coating or protective layer.

Stress reduction in the system:

  • Rubber gaskets absorb sound and vibrations.
  • The distance between the two ends of the pipes can be used as a vibration absorber.
  • Due to the above characteristics, different types of couplings can be used as vibration absorber in pumping stations and along the pipe.

Use of Coupling  for GRP Pipes:

Couplings can be used instead of manchoned[1] end  to connect GRP pipes in pipelines. The advantages of coupling over manchon is as follows:

When repairing or disconnecting two connected pipes in GRP pipelines, the manchoned end must be broken, while the coupling can be easily opened and closed due to the bolted connection.

Resin (adhesive) and fiber welding methods are used to implement GRP pipelines, but the coupling connection is used for both above and under- ground .The angular flexibility of the coupling is greater than the angular deflection of the manchoned end.

. installation and assembly speed is faster than manchone

Item No

Name

Material

1

Body

ST37-2

2

End Ring

ST37-2 or Ductile Iron

3

Gasket

NBR or EPDM

4

Bolts & Nuts

Galvanized steel

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