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symmetrische Red.

asymmetrische Red.


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KR Compensating Reducers

Standard Reducers

GUR KR compensating reducers have a smooth inner surface in their conical diameter transition and cylindrically shaped transition zones ensuring optimised flow of the fluid transported. The inlet/outlet DN diameters are graded as specified by DIN; higher reductions in a single GUR KR reducer are also available. The specially designed textile reinforcement (yellow in the illustration at right) permits movement in the axial, lateral and radial directions, supports force from the fluid pressure within the line and is dimensionally stable within its nominal working pressure range. As a result GUR KR compensating reducers - unlike bellows and other compensator designs - cause no stressing to neighbouring connecting flanges of pumps and other displacement-sensitive process components.

The standard flange connection in GUR KR compensating reducers is a freely rotatable FL design located behind the steel-cored rubber bulge. Short GUR KR compensating reducers can also be supplied with Type FR fixed flanges. GUR KR compensating reducers are also available with a divided flange at the smaller diameter end permitting change of the rubber components while continuing use of the flanges.

The inner coating layer of GUR KR compensators is 10 mm thick; the outer layer is at least 2 mm in thickness. As a result GUR KR compensators have a high abrasion reserve and provide long service lives in process environments.

While exhibiting basically the same properties as GUR KR, GUR K compensators differ in that they are constant in DN throughout. GUR K compensators are supplied as standard components with the same principal dimensions as the GUR KR series.


Rubber Grades

The grade of rubber contacting the material transported is selected in accordance with the expected types of environmental attack in the application. Environmental attack categories have been derived from typical applications in chemical plants, minerals processing facilities, flue gas scrubbing stations and steel works. The basic rubber grades developed for these application categories are shown in the table at right.
Along with these grades special grades from our extensive range of formulations are also available to solve customer-specific problems. The outer covering layer is generally made of ozone-, oil- and weather-resistant rubber. Certain types of environmental attack in an application may call for the use of specialty grades from our range of formulations.

rubber grade suited for exposure to maximum service temperature
NR abrasion, light corrosion up to 100° C
EPDM corrosion, acids, bases up to 120° C
NBR oils, greases up to 110° C

Standard Dimensions

Compensating reducers with standard dimensions are frequently a cost-effective alternative when used as components in processes conveying corrosive and abrasive materials as they simplify replacement part inventory requirements and procurement.

GUR KR compensating reducers in standard versions are supplied with inner surfaces in the rubber grades specified in the above table. The outer surface is made of oil- and weathering-resistant rubber.

All standard components are designed with a nominal pressure rating of PN 10 (10 atmospheres) and a bursting pressure a factor of at least 1.3 greater. The dimensions of their galvanised connecting flanges are in general conformance with DIN 2673. At least one of the flanges on them is a loose flange which in conjunction with the integrated “O” ring seals makes them extremely installation-friendly.

The dimensions of our standard compensators are given in the table below:

GUR KR Compensating Reducers in Process Equipment Construction

GUR KR compensating reducers are often used along with high-performance pumps in power plants (FGD circulation pumps), chemical plants, mining operations and other facilities in which large volume flow rates of corrosive and abrasive fluids are conveyed. Here they provide great advantages over conventional solutions, i.e. a combination of a rigid DN reducer with a bellows compensator, which can be problematical particularly when conveying slurries in high DN lines (> 1000 mm).

The functional heart of our compensating reducers is a massive rubber core reinforced with textile threads providing highly damped resiliency. The reinforcing threads exhibit high elongation in response to tensile stress and are oriented in both the longitudinal and transverse directions. The textile reinforcement is designed specifically to optimise the elongation properties of the GUR KR to the application at hand. The most frequent design type selected ensures minimum length change in response to pressure fluctuations. Any pressure fluctuations occurring are transformed into circumferential expansion or contraction which is not problematical in pipelines.

The massive rubber core of GUR KR is sufficiently elastic to respond to pressure changes in the pipeline with slight deformation, in effect adapting to the pulse of the flow. This phenomenon in conjunction with the high damping factor of the rubber results in outstanding cavitation resistance. Flow speeds up to 10 m/s are permissible without causing cavitation damage.

Along with the standard PN 10 rated version, GUR KR compensating reducers are offered with flanges in conformance with ANSI, ASME and DIN PN 6, PN 16 and PN 25 as well as flanges made to customers’ specifications. GUR KR compensating reducers are available with nominal diameters up to DN 1400, in both concentric (symmetric) and eccentric (asymmetric) versions.

GUR KR Design Versions for Process Equipment Construction

The basic designs of GUR KR compensating reducers can be varied within wide limits. Currently these products are available in overall lengths up to 3000 mm and partial lengths m and n of up to 1000 mm each. Lengths in excess of these figures are also possible in some cases - please contact us with your specific enquiry.

The maximum available large-side nominal diameter DNlarge is 1400 mm.

The transition length k is calculated from the difference between the large and small inner diameters by the following formula:

k= 3 x (DNlarge - DNsmall)

This formula is valid for both concentric and eccentric GUR KR compensating reducers.

GUR KR compensating reducers are available with custom-fabricated lateral line sockets and monitoring ports. The minimum socket length ls is 100 mm up to a socket nominal diameter DNs of 150 mm. At larger socket nominal diameters the minimum socket length ls is 200 mm. The minimum separation between the socket and the nearer GUR KR end flange is 200 mm. Lateral sockets and ports can only be integrated into the cylindrical sections of the reducer. If more than one socket is to be fabricated on a cylindrical section, the minimum required separation between the sockets is given by the sum of DNs + 200 mm. However two sockets can be configured at the same length location if they are staggered by 180 ° over the circumference.

The maximum avaliable socket nominal diameter is DNs = 200 mm or 400 mm less than the nominal diameter of the cylindrical section of the GUR KR, whichever of the two is smaller.

KR Schnitt sym.KR Schnitt asymm.

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