Technical Changes, Adjustments

We reserve the right to make design and dimension changes as well as price adjustments without prior notice. The product images on the Internet may differ from the delivered items. Weight information is  without guarantee. No liability is assumed for errors. For special areas of application, please ask our product management for a suitable solution. Copying and reprinting, even as extracts, only allowed with the permission of Schwer Fittings GmbH.

Deviation from the norm

In principle, our articles correspond to the specified standards. However, we reserve the right to deviate from the specified standards in terms of design and dimensions. Dimensions are altered when we see a technical advantage or manufacturing necessity. If exact specifications according to the standard are required, please contact our product management.


For Your Safety

As the pipe connection elements are occasionally subject to heavy loads such as vibration and uncontrolled pressure peaks, only original Schwer components should be used in accordance with the sf assembly instructions. Otherwise the functional safety can be compromised and lead to the loss of the warranty.


Pressure Specifications

The permissible nominal pressures (PN) can be found in the tables on each catalogue page. The pressure is always given in bar and refers to the medium water, statically loaded. Under normal operating conditions (static) and temperatures (20°C), the operating pressure (PB) can be chosen equal to the specified nominal pressure (PN) (see DIN 2401 Part 1). The nominal pressure (PN) is a common, rounded, pressure related key number. Operating pressure (PB): The permissible operating pressure for a component is the highest internal pressure that is permissible for this component based on the material and the calculation bases at the permissible operating temperature with trouble-free operation. At elevated temperatures, the operating pressures (PB) should be reduced compared to the nominal pressure (PN) according to the following pressure reduction table.


Pressure Reduction Table

Temperature range / pressure reduction

-60°C to 20°C / 0,0 %
50°C / 4,5 %
100°C / 11,0 %
150°C / 16,0 %
200°C / 20,0 %
250°C / 24,0 %
300°C / 29,0 %
350°C / 31,0 %
400°C / 33,0 %

Note that DIN 17440 Tab. 6 recommends a maximum temperature of 400° C for 1.4571 stainless steel


European pressure equipment directive PED 2014/68/EU

Range A and V (fittings and valves):

All products are developed and manufactured in accordance with Article 4.3 of the European Pressure Equipment Directive PED 2014/68/EU. Products with nominal diameters of more than 25 mm up to and including 32 mm must not be used for pumping liquid or gaseous fluids of group 1 (hazardous) according to the Pressure Equipment Directive PED 2014/68/EU. Products with nominal diameters greater than 32 mm may only be used for pumping group 2 (non-hazardous) liquid fluids according to the Pressure Equipment Directive PED 2014/68/EU. If used with other media, a review by Schwer Fittings should be requested.

ECO range (Ecotube fittings):

All products are developed and manufactured in accordance with Article 4.3 of the European Pressure Equipment Directive PED 2014/68/EU. Products with nominal diameters of more than 25 mm up to and including 32 mm must not be used for pumping Group 1 (hazardous) gases according to the Pressure Equipment Directive PED 2014/68/EU. Products with nominal diameters of more than 32 mm may only be used for pumping group 1 (hazardous) or group 2 (non-hazardous) liquid fluids according to the Pressure Equipment Directive PED 2014/68/EU. If used with other media, a review by Schwer Fittings should be requested.

QC Range (quick connect couplings):

All couplings are designed and manufactured according to Article 4.3 of the European Pressure Equipment Directive PED 2014/68/EU. Couplings with nominal diameters of more than 25 mm up to and including 32 mm must not be used for pumping liquid or gaseous fluids of group 1 (hazardous) according to the Pressure Equipment Directive PED 2014/68/EU. Couplings with nominal diameters of more than 32 mm may only be used for pumping group 2 (non-hazardous) liquid fluids according to the Pressure Equipment Directive PED 2014/68/EU. If used with other media, a review by Schwer Fittings should be requested.

Range Aq (Aquapress Pressfittings ball valves):

All ball valves are designed and manufactured in accordance with Article 4.3 of the European Pressure Equipment Directive PED 2014/68/EU. Ball valves with nominal diameters of more than 25 mm up to and including 60 mm must not be used for pumping group 1 (hazardous) gaseous fluids according to the Pressure Equipment Directive PED 2014/68/EU. Ball valves with nominal diameters of more than 60 mm may only be used for pumping group 1 (hazardous) or group 2 (non-hazardous) liquid fluids according to the Pressure Equipment Directive PED 2014/68/EU. If used with other media, a review by Schwer Fittings should be requested.

Statement from Schwer Fittings


Combining different coupling connections

When combining different coupling connections as well as different connectors and sealing materials within a line system, the lowest operating pressures and the lowest temperature limits apply.


Correct Assembly

For the pressure specifications given, it is assumed that the assembly is carried out properly and correctly. To do this, follow the sf assembly instructions. Likewise, when installing the pipe system, care must be taken to ensure that no additional loads and stresses act on the coupling connections.

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