There is provided a technique that includes: a gate valve including a movable gate valve plate; and a butterfly valve that is installed at the gate valve plate, has a diameter smaller than those of valve openings configured to be opened or closed by the gate valve plate, and is configured to be capable of being fully closed, wherein the gate valve plate of the gate valve and the butterfly valve are configured to be capable of being driven independently of each other.

An adjustable cage assembly for a flow control device can include a first cage body and a second cage body. The first cage body can be rotationally fixed relative to the second cage body at a plurality of alignments to provide a flow opening of variable size for adjustable control of fluid flow areas through the adjustable cage assembly.

An adjustable cage assembly for a flow control device can include a first cage body and a second cage body. The first cage body can be rotationally fixed relative to the second cage body at a plurality of alignments to provide a flow opening of variable size for adjustable control of fluid flow areas through the adjustable cage assembly.

An adjustable cage assembly for a flow control device can include a first cage body and a second cage body. The first cage body can be rotationally fixed relative to the second cage body at a plurality of alignments to provide a flow opening of variable size for adjustable control of fluid flow areas through the adjustable cage assembly.

An adjustable cage assembly for a flow control device can include a first cage body and a second cage body. The first cage body can be rotationally fixed relative to the second cage body at a plurality of alignments to provide a flow opening of variable size for adjustable control of fluid flow areas through the adjustable cage assembly.

The invention relates to a valve for controlling a fluid flow, comprising at least one valve housing having at least one inlet and one outlet side, and a valve insert for regulating the fluid flow between the inlet side and the outlet side, which valve is arranged within the valve housing. The valve insert comprises at least one first element, designed as a hollow body, and a second element, wherein the second element is arranged within the first hollow-body-shaped element. Furthermore, the valve insert is arranged within the valve housing in such a way that the first element is axially fixed in the valve housing, and the second element is arranged so as to be rotationally fixed in the valve housing. The first element has at least one opening along the circumference of the first element for passing the fluid flow through and is designed to be rotatable relative to the second element; the second element is designed to be axially movable relative to the first element.

A water control valve includes a valve body defining a valve body internal cavity, a first air inlet passageway in communication with the valve body internal cavity, a first water outlet passageway in communication with the valve body internal cavity, and a water inlet passageway. The water control valve further includes a valve cartridge removably coupled to the valve body. The valve cartridge is sized to fit at least partially within the valve body internal cavity. The valve cartridge defines a second air inlet passageway and a second water outlet passageway. The first air inlet passageway is aligned with the second air inlet passageway and the first water outlet passageway is aligned with the second water outlet passageway when the valve cartridge is coupled to the valve body.

A control valve for a reverse osmosis water purifying system provides a feed water port, a squeeze water port, a drain port, and a product water connection, each of which open into a bore. A first, second, and third O-rings are located in the bore successively between the feed water port, the squeeze water port, the drain port, and the product water connection. A control piston is moveably located in the bore of the housing. The control piston includes a vent/drain well in which a side is chamfered and at least one recess disposed around an end of the control piston. The vent/drain well provides a fluid passage between the squeeze water port and the drain port when the vent/drain well passes over the second O-ring. The fluid passage includes an opening formed between the second O-ring and the chamfered side of the vent/drain well, where the size of the opening is responsive to the position of the control piston.

An electric switch valve, comprising a valve base and a valve block. The valve base has an upper end surface, and is provided with a first outlet and a second outlet. The valve block has a matching portion and a notch portion. The matching portion is adhered to the upper end surface of the valve base, and can rotate relative to the valve base. The notch portion can be selectively communicated with the first outlet or the second outlet. The valve block further comprises at least one throttling portion. A channel formed in the throttling portion comprises at least one throttling orifice. A valve block, which can not only be applied in an electric switch valve, but also can be applied in valves used for other refrigeration systems so as to achieve the throttling function for the flow of a certain outlet.

The present invention proposes a balancing valve, a fluid network with such a balancing valve, and a method of maintaining such a balancing valve. The balancing valve comprises a housing having a main fluid passage extending along a main flow axis, a valve body disposed within the housing in the fluid passage, wherein the valve body has a first through hole forming a first fluid passage with a variable first fluid passage cross section. The valve body has a second through hole distinct from the first through hole and forming a second fluid passage in the valve body. The first fluid passage is a main fluid passage and the second fluid passage is a by-pass passage.