Abstract: A fluid-based heating/cooling system includes valve means (C) for controlling the rate of flow of fluid through the system and operating means (A, D) for effecting operation of the valve means (C) in response to the difference in temperature of the fluid at two points in the system.

Abstract: Thin gage, rollable plastic vinyl floor mats can be provided with an abrasive and grit coating that will not deteriorate or degrade when the mats are rolled or otherwise substantially deformed. A special blend of epoxy adhesive and MEK is used to permanently bond the grit to the vinyl surface.

Abstract: A process for producing clad pipe comprises forming a hollow body (S10) of base material, bonding a cladding material metallurgically to the base material (S12) to form a composite body and subsequently extruding the composite body to form a pipe. This process allows the metallurgical bond to be validated using non-destructive methods prior to extrusion. Any areas that are unbonded will be detected, thereby reducing wastage. Moreover, because the metallurgical bond is achieved prior to extrusion, the cladding thickness is controlled during the extrusion process, avoiding migration of the clad material into the base material by disproportionate amounts.

Abstract: A process for producing clad pipe comprises forming a hollow body (S10) of base material, bonding a cladding material metallurgically to the base material (S12) to form a composite body and subsequently extruding the composite body to form a pipe. This process allows the metallurgical bond to be validated using non-destructive methods prior to extrusion. Any areas that are unbonded will be detected, thereby reducing wastage. Moreover, because the metallurgical bond is achieved prior to extrusion, the cladding thickness is controlled during the extrusion process, avoiding migration of the clad material into the base material by disproportionate amounts.