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