Abstract: The receiving unit can be removed from the valve unit and fastened preferentially by means of a fast locking means, in particular of a bayonet lock, a thread or a plug-in lock. The valve unit is spring-biased in the closing direction and opens toward the inside. The receiving unit is spring-biased in the closing direction and opens toward the outside. The valve unit and receiving unit are linked in sealing connection preferentially by means of mating ball joints. At the valve unit a discharge bore hole may lead from the discharge opening toward the outside the valve bar being located outside the discharge bore hole. At the lock the closure bar may extend outward from the opening of the receiving unit. The actuating device acts on the lock of the receiving unit preferentially by a two-part driver device with a cam coupled to the closure housing and a recess arranged at the closure bar.

Abstract: A butterfly type valve has a closure disc with opposed trunnions or support stem portions for rotatably supporting the closure disc in a valve body which is bored to receive respective sets of circular disc type springs urging seal faces on a body liner into engagement with cooperating annular seal faces formed on an overmold resilient plastic layer on the closure disc. The closure disc outer layer is formed of PFA or PVDF type plastic and the body liner of PTFE type plastic, respectively to eliminate cold fusion when the closure disc is forcibly engaged with a seat surface formed by the liner. The closure disc layer includes a portion filling an undercut groove in the closure disc stems which is cooperable with a cylindrical collar formed on the liner and a backup seal to further seal the stem portions from exposure to the fluid flowing through the valve or the environment in which the valve is disposed.

Abstract: Disclosed is a plastic lined rotatable valve. The valve includes a valve body that is formed by at least two connected together body parts or halves. Each body half is lined with an inert plastic material. The seal between the body halves or parts is provided by sealing flanges on the plastic lining. The sealing flanges are resiliently urged together, thereby to compensate for cold flow and to isolate the sealing flanges from stresses on the valve body due to uneven piping loads. The valve body halves or parts include rims about the junction where the halves or parts are joined together which form a rigid shell for the valve body, which further isolates the sealing flanges from mechanical stresses. The valve includes a plastic encapsulated valve member that is rotatable by a plastic encapsulated stem. A packing is provided for sealing between the stem and valve body.