A microfluidic flow rate regulator can precisely control the fluid flow rate. When direct the fluid passing through the length-adjustable annular channel with a very thin gap inside the apparatus, the resistance generated by the fluid viscosity will slowdown the fluid flow rate; by adjusting the length of the length-adjustable annular channel, also changes the sum of the resistance that generated by the fluid viscosity and changed the fluid flow rate.

Valve assemblies include a first actuation element coupled to the valve member, where the first actuation element is configured to move the valve member between a first closed position and a second open position. An inner housing encloses the first actuation element and is statically sealed to a valve body. A second actuation element is configured to be coupled to a valve actuator for moving the second actuation element relative to the first actuation element, where movement of the second actuation element is configured to indirectly apply a force to the first actuation element through the inner housing.

A valve assembly including a valve body, an outer housing having rotating shaft containing magnets and being driven by a motor, an inner housing statically sealed to the valve body, and an actuation system enclosed within the inner housing, the actuation system having magnets that are induced by magnetic field created by the rotating shaft magnets.

Water outlet valve structure and a humidifier having the same. Opening or closing of the water outlet valve structure is controlled by a control structure. The water outlet valve structure includes a flow channel including an inlet and an outlet. The control structure is capable of sealing or opening the outlet of the flow channel. The outlet of the flow channel is capable of being sealed or opened by the control structure of the water outlet valve structure, to control the open and close of the flow channel, thereby simplifying the water outlet valve structure. In a further aspect, since only the outlet is sealed, specific requirements for the structure of the control structure are relatively low, thereby allowing the control structure to be simplified.

Various devices and techniques related to valve actuation conversion kits are generally described. In various examples, conversion kits may include a bonnet component. In some examples, the conversion kits may include at least one attachment component effective to couple the bonnet component to a body or bonnet of a legacy valve. Coupling the bonnet component to the body or bonnet of the valve may form a cavity enclosed by the bonnet component and the body or bonnet of the valve. A portion of a stem of the valve may be disposed within the cavity when the bonnet component is coupled to the body or bonnet of the valve.

A programmable, electronically controlled sprinkler system has a hermetically sealed internal chamber which encloses all of the internal water flow, valves, mechanical and rotational components and a plurality of magnetic coupling arrangements which allow external motors to control operation of the internal mechanical components without requiring any hydraulic seals.

The invention relates to a drain valve (1) for a sanitary cistern, in particular a concealed cistern, having a valve housing (2) with a drain opening (4), the drain opening (4) being delimited by a valve seat (6), and a valve body (7), which rests in a sealing manner on the valve seat (6) in the closed state of the drain valve, the valve housing (2) having a housing chamber (11), arranged upstream of the valve seat (6) in the direction of flow, for receiving water. To allow the drain valve to be arranged outside the cistern and to enable access to the drain valve for maintenance as well as removal via an inspection opening that can be covered by a toilet bowl or urinal bowl, the invention suggests that the valve body (7) is provided with an auxiliary chamber (12) for receiving water, the receiving volume of which is smaller for water in the open state of the drain valve (1) than in the closed state of the drain valve (1), the auxiliary chamber (12) being delimited by a flexible and/or movable wall section, and wherein the auxiliary chamber (12) is associated with an auxiliary drain valve (16) which in a first position permits an inflow of water into the auxiliary chamber (12) and in a second position permits an outflow of water out of the auxiliary chamber (12).

A valve device includes a valve, a driving device, and a transmission unit. The valve changes a circulation mode of refrigerant flowing through a circulation path of a refrigeration cycle system. The driving device drives the valve. The driving device includes a housing and an electric driving unit as a drive source. The transmission unit is arranged in a driving transmission path extending from the electric driving unit to the valve, and changes a speed of rotation generated by driving of the electric driving unit. The transmission unit is entirely or partially arranged in the housing that is partitioned from the circulation path in a liquid-tight manner.

Ultra-high speed valve comprising a valve unit which comprises: a moving valve member, a valve seat and a magnetic latch, such that the valve is held shut by the latch, holding the moving valve member against the valve seat such that the valve bursts open along the direction of fluid flow the moment the valve is unlatched, aided by the fluid pressure. The valve opening can be additionally aided by decompression of a compression member compressed by the latched moving valve member and by using an additional actuator connected to the moving valve member. Movement of the moving valve member can also be accelerated by utilizing varying fluid pressures on both sides of the moving valve member. Combinations of the valve unit can be used to configure monostable and bistable valves and to form ultra-high speed actuators when used with compressed air.

An overfill valve associated with a drop tube segment fluidly connected to a fluid reservoir is described. The overfill valve includes a valve body positioned within the drop tube segment and a non-contact valve actuator positioned exterior to the drop tube segment and operable to actuate the valve body from an open position to a closed position without requiring any physical penetration through the wall of the drop tube segment. The non-contact valve actuator has a first position in which the non-contact valve actuator does not actuate the valve body from the open position to the closed position in a second position, achieved when the liquid reservoir reaches a predetermined level approaching the capacity of the liquid reservoir, the non-contact valve actuator actuating the valve body from the open position to the closed position when the non-contact valve actuator obtains the second position.