Abstract: An valve actuator in a hydronic heating and cooling system includes a motor for changing the position of a valve, a switch for switching power to the motor, and a sensor for detecting the arrival of the valve at a desired position and for stopping the motor without using a mechanical stop. The motor's power source includes a capacitive power source which can be used to drive the motor under low-power conditions. A worm gear is used in the drive train, and combined with a clutch assembly to permit the valve to be operated manually.

Abstract: An valve actuator in a hydronic heating and cooling system includes a motor for changing the position of a valve, a switch for switching power to the motor, and a sensor for detecting the arrival of the valve at a desired position and for stopping the motor without using a mechanical stop. The motor's power source includes a capacitive power source which can be used to drive the motor under low-power conditions. A worm gear is used in the drive train, and combined with a clutch assembly to permit the valve to be operated manually.

Abstract: A combined syringe and hub assembly in which the syringe comprises a hollow barrel and a slidable plunger therein. The hub comprises a body with an open cavity and a cannula in fluid communication therewith. A mating detent mechanism is provided on the syringe and the hub for connecting same in a snap-fit relationship. This detent mechanism also provides for the connection of the hub to the syringe in a tight fit relationship for an essentially non-separable functional union of the syringe and hub components. A shield is preferably removably connected to the hub and serves to protect the cannula prior to use of the syringe.