Abstract: A multiport, diaphragm-sealed valve suitable for use in sampling systems. Using a rotational movement, which can be electrically controlled, the valve operates without leakage or intermingling of transfer fluids to provide a simultaneous seal of all fluid pathways during the switching of flowpaths. multiport, diaphragm-sealed valve suitable for use in sampling systems. Using a rotational movement, which can be electrically controlled, the valve operates without leakage or intermingling of transfer fluids to provide a simultaneous seal of all fluid pathways during the switching of flow paths.

Abstract: A multi-port diaphragm-sealed valve capable of use at high temperatures, said valve including actuating pistons having spring-lock seals of heat resistant material, said pistons having specially adapted structure allowing for the spring lock seals to be readily assembled thereon.

Abstract: A multi-part diaphragm-sealed valve suitable for use in high or low pressure chromatography of the type actuated by a spring biased within a cylinder. The piston is provided with a stop means to limit compression of the springs. A groove is provided in the cylinder wall to allow quick pressure build up and decay within the spring to insure quick action of the valve itself.