Questions - Answers
We prefer answering to your questions individually. Please select the appropriate Contact.
Please find answers to frequently asked questions (FAQ) here:
STRAUB-GRIP-L in W2 and W5,
STRAUB-METAL-GRIP in W1, W2, and W4
STRAUB-PLAST- and -COMBI-GRIP in W2 and W4
STRAUB-FLEX and -OPEN-FLEX in W1, W2, and W5
Basically, STRAUB-FLEX couplings can be used to compensate for the differences in diameter of up to 10mm, depending on the diameter. Upon request, also larger differences in the diameter can be compensated for using STRAUB-STEP-FLEX couplings.
STRAUB-GRIP couplings do not require additional mounting points. When using STRAUB-FLEX or STRAUB-OPEN-FLEX couplings, one fixing point per coupling has to be installed.
Yes, it does. The patented anchoring rings enable faultless anchoring to be achieved even with hard pipe material surfaces.
Up to what extent the STRAUB couplings attenuate pressure surges and sound compared to a welded pipe connection?
Depending on the type of coupling used, the attenuation values are 3 to 7-times better than those achieved with welded or flanged connections.
The clamping ranges of the couplings are indicated on the data sheets. Refer to Products. Within these ranges, trouble-free installation of the coupling is ensured. Under certain conditions, also pipes of diameters outside these clamping ranges may be connected to each other. If in doubt, please contact STRAUB Application Technology Department.
Assuming favourable conditions, lifespan of more than 25 years can be expected.
Yes, they are. But if the maximum operating temperature is exceeded repeatedly or for a longer period of time, lifespan of the sealing sleeve will be reduced.
Yes, they do. Values of up to 50mbar abs. can be achieved. When the coupling is used under vacuum conditions, the strip insert must be used.
No, they are not. The installation tolerances given are limits that apply to the individual application. If several cases occur simultaneously, the allowable values must be reduced. If in doubt, please contact STRAUB Application Technology Department.
No, they are not. (The couplings can accept such load to a certain extent which, however, will result in coupling misalignment.)
Both are axially restraint couplings for metal pipes. The STRAUB-METAL-GRIP type is of significantly stronger design. The STRAUB-GRIP-L is strong enough for approx. 75% of all applications.
Yes, it is. The sealing sleeve is manufactured in the same way a FLEX sealing sleeve is and is then cut. Thus, cutting surfaces are achieved that absolutely match and provide 100% leak-proof sealing performance.
The bolts do not require to be re-tightened. STRAUB couplings are completely maintenance free.
No, they are not. Only remove dirt, rust or paint remainders. Debur, if necessary.
25 years and more can be achieved. There are couplings that have been in use since 1974.
It is used to protect the sealing sleeve under vacuum conditions, to fill large gaps between pipe ends, to prevent rubber swelling, axial displacement, axis misalignment, or if external overpressure is present.
The Sealing lip is flexing, thereby taking up any axial movement of the pipe. Because of the specific shape of the sealing lip the coupling can compensate for a certain amount of axial change in pipe length without friction occurring between the surface of the pipe and the rubber. As a result, such movements can be absorbed as often as required.
Because of the slotted casings (internal weakening).
STRAUB-GRIP-L and STRAUB-METAL-GRIP are electrically conductive. STRAUB-FLEX and STRAUB-OPEN-FLEX couplings can be made electrically conductive by using the "Current Conductor".
For any other questions or additional information, please contact:
STRAUB Werke AG
Tel. +41 81-725 41 00
Fax +41 81-725 41 01