Abstract: A stiffly compliant upstop extends parallel to the hinge axis of a bi-petal check valve and provides essentially a continuous line of contact with the downstream side of each valve member. This line of contact is symmetrically located to span virtually the entire distance between the spaced hinge-suspension points unique to each valve member. And continuity of the respective lines of upstop contact is maintained throughout a terminal range of angular displacement, as the upstop compliantly deforms in approach to the full-open condition of the respective valve members.

Abstract: A ball clutch mechanism couples a faucet knob to the splined end of a valve stem for releasing the valve stem when the knob is fully depressed. A dashpot damped return spring urges the valve stem toward valve closed position when the clutch mechanism releases. The same dashpot controlled return spring closes the valve if the knob is released either before or after full travel inward. Rotation of the knob rotates the valve stem to determine water temperature by mixing hot and cold supplies. Check valves control passages that are provided to vent the lines during fluid flow and to drain the lines when the system is serviced.

Abstract: A motor-driven continuously running system wherein multiple reciprocating bellows units are disposed in angularly spaced relation about the rotary axis of a swashplate. Each bellows is frame-referenced at one end, and its other end is axially driven by the swashplate. As the bellows units reciprocate in phased succession, air is driven into and expelled through a valve/manifold unit, which channels air to and from outlet and inlet fittings, via integrally formed reed check valves. The output is a steady flow of contamination-free pressurized air.