A pressure operated fluid valve (10) having a configurable diaphragm arrangement (100) consisting of a flexible profile (110), a sealing portion (130) having a metallic insert (131) encapsulated in a natural or a synthetic rubber, the sealing portion (130) having a combination profile (140), a pressure management profile (150) on an inside curvilinear surface (114) of the flexible profile (110); a clear peripheral space (14) between an outer surface (113) of the clapo-diaphragm (100) and inner circumferential surface (24) of the main fluid flow chamber (20) is maintained to a non-zero value, during an open and close operation of the pressure operated fluid valve (10) throughout its life cycle; further comprises a secondary pressure management assembly (170) disposed between the first anchor (57) in the diaphragm cover (50) and the second anchor (137) in the configurable diaphragm arrangement (100).

A vehicle cleaning system includes a drive pump, an ejection nozzle and a valve device. The valve device includes an intake passage, a valve that closes the intake passage and accumulates pressure of the fluid supplied to the intake passage, a discharge passage, and an auxiliary mechanism. The auxiliary mechanism generates leakage of the fluid from the intake passage during the pressure accumulation to accumulate pressure with the leakage at a leaked side, opens the valve body based on two pressures accumulated in the intake passage and the leaked side, outputs the fluid, which is pressure-accumulated in the intake passage, to the discharge passage by opening the valve body, and closes the valve body as the fluid is output to the discharge passage to allow for re-accumulation of the pressure in the intake passage.

A closed leak-free, diffusion-blocking one-way check valve is composed of a substrate having a flow passage through the substrate, the flow passage has a sealing surface between the substrate and a membrane preventing flow through the flow passage. A thin film having internal stress is disposed on the membrane which induces deformation of the membrane biasing the membrane resulting in the sealing surface in a closed orientation. A method for fabrication and pump utilizing the check valve are disclosed.

A bi-directional valve has an inlet with an outlet that may interchangeably applied to a pressure source and still operate properly. A spring applies a bias to a concave diaphragm against a cover plate in a non-relieving configuration to seal an inlet relative to an outlet. The cover plate may have ports with a shallower attack angle than prior art designs. Those ports may also have different shapes to facilitate significantly more flow permitting at least some better performance characteristics than prior art designs.

A duckbill flow control device includes: an upstream inlet end; a downstream outlet end; and a transition portion extending between the inlet end and the outlet end. The outlet end is tapered and includes a top flat area and a bottom flat area that meet in the closed state with a slit formed between the top and bottom flat areas. Further, a dynamic recover mechanism is affixed to the top and bottom flat areas of the outlet end, and the dynamic recover mechanism provides a fast and linear closure of the outlet end during operation as compared to a duckbill flow control device that does not have a dynamic recover mechanism. A method of using the duckbill flow control device is also included.

A pneumatic valve comprises a housing with an air chamber having supply, connecting and discharge openings. An actuator with a movable closing element is arranged in the housing, featuring a plunger, which projects through the discharge opening with a plate and a first sealing element for closing the discharge opening with an elastic element which, in the activated state, presses said sealing element against the discharge opening The actuator is in the form of an SMA actuator, wherein the actuator element is configured to, in a non-energized state, bring the actuating element to a first state in which it presses the plunger against the supply opening, and to, in an energized state, bring the actuating element to a second state in which the actuating portion does not exert any force on the plunger, wherein a second sealing element is arranged in the air chamber and functions as a check valve.