Bestobell Steam has introduced its Delta Element design aimed at providing years of trouble-free service with no steam loss. Bestobell Steam’s delta element is a triangular-shaped bimetal strip of austenitic and ferritic stainless steels. The materials are rolled together, shaped into the delta pattern and then heat-treated to eliminate stresses. The single-blade design provides faster response than found with typical stacked arrangements due to the larger surface/mass ratio. The stem is situated at a point that allows the expansion of the bimetal to exert a linear pull on the stem to prevent uneven wear on the sealing surfaces. The Bestobell steam traps employ a hybrid design that utilises both thermostatic and thermodynamic principles to achieve a continuous modulating discharge of condensate as it forms, and eliminates live steam loss. The combination of a temperature-sensitive closing force (thermostatic element) and a pressure-sensitive opening force (thermodynamic valve) overcomes the sluggishness and susceptibility to service failure than can be encountered with traditional bimetal designs. The valve design utilises the thermodynamic pressure forces of the flashing steam to provide quick response and a wide operating range closely approximating the steam curve.
