A control valve for a fluid treatment apparatus is provided, including a valve body having a control portion and a treatment portion, the portions being separated from each other so that fluid in the control portion is isolated from fluid in the treatment portion. The treatment portion includes a plurality of piston valves reciprocating in corresponding openings defined in a corresponding number of cylinders for controlling water to be treated in the apparatus. Each of the cylinders has a plurality of peripherally spaced, vertically-extending guide ribs configured for facilitating engagement of the piston valves with the openings and for reducing unwanted cavitation.

A choke valve and a method of operation of the choke valve in which the choke valve includes an orifice plate and/or a guide vane to control a flow of fluid though the choke valve, the orifice plate defining a center point and being rotatable about a center axis extending longitudinally through the center point; the orifice plate defining at least one aperture including a first aperture, the first aperture defining at least a first equi-incremental phase region, the first aperture being spaced away from the center point of the orifice plate; and rotation of the orifice plate with respect to the center point effecting an incremental and staged transitioning of the orifice plates among a plurality of open states.

A device for controlling the flow of a fluid through a conduit from an upstream side of the device to a downstream side of the device is provided. The device includes an upstream valve casing defining an inlet, a downstream valve casing defining an outlet aperture, and a valve core secured between the upstream valve casing and the downstream valve casing. The upstream valve casing, the downstream valve casing and the valve core are formed as discrete parts. The valve core includes a housing defining a control volume. The valve member is mounted on the housing and positioned on the upstream side of the outlet aperture, the valve member being arranged to move reciprocally to selectively open and close the outlet aperture, thereby controlling flow of the fluid through the outlet aperture.

A quick disconnect fitting includes a plug and a socket to receive the plug. The plug includes a fluid channel, an inlet to the fluid channel, and a pressure regulating valve assembly. The valve can include a poppet, and a valve nozzle comprising an orifice. The valve assembly resides in the fluid channel. The socket includes a socket stem to contact the valve assembly and push the valve assembly into the fluid channel of the plug upon the socket receiving the plug.

A quick disconnect fitting includes a plug and a socket to receive the plug. The plug includes a fluid channel, an inlet to the fluid channel, and a pressure regulating valve assembly. The valve can include a poppet, and a valve nozzle comprising an orifice. The valve assembly resides in the fluid channel. The socket includes a socket stem to contact the valve assembly and push the valve assembly into the fluid channel of the plug upon the socket receiving the plug.

A control valve is provided for a fluid treatment apparatus, including a housing with at least one cylinder defining a fluid flow path in the apparatus, each cylinder having an associated reciprocating piston valve. The valve includes a first piston valve half; a second piston valve half complementary to the first piston valve half; and a resilient seal constructed and arranged for being sandwiched between the first and second piston valve halves. The first piston valve half is constructed and arranged for engaging the cylinder before the second piston valve half, and having an exterior peripheral edge defined by a plurality of peripherally spaced teeth creating flow spaces between the teeth.

A control valve is provided for a fluid treatment apparatus, including a housing with at least one cylinder defining a fluid flow path in the apparatus, each cylinder having an associated reciprocating piston valve. The valve includes a first piston valve half; a second piston valve half complementary to the first piston valve half; and a resilient seal constructed and arranged for being sandwiched between the first and second piston valve halves. The first piston valve half is constructed and arranged for engaging the cylinder before the second piston valve half, and having an exterior peripheral edge defined by a plurality of peripherally spaced teeth creating flow spaces between the teeth.

A control butterfly valve comprises a valve body having a fluid passage through which a fluid flows, a valve disc controlling an opening and closing of the fluid passage of the valve body, and a diffuser including a passing hole configured to allow the fluid, which passes through the valve disc, to pass therethrough and a passing part configured to allow the fluid, which passes through the valve disc at a low speed, to pass therethrough.

A reject valve of a reverse osmosis device, which is especially suited for brackish water reverse osmosis devices, which require a low system pressure less than 15bar. The valve keeps the system pressure substantially constant in a pre-defined range of the reject volume. The size of the inflow channel is adjusted by a spring-operated cone, which never entirely closes the channel, which forms a constant throttle until the pressure of the inflow has risen to approximately three quarters of the pressure arranged by the spring and prevailing at maximum volume of the reject flow. This operation is arranged structurally such that onto the shaft of the cone is fixedly supported a transverse plate abutting the inner wall of the body, which as pressed by the compression spring is supported by the end of an element connected to the end of the body, wherein the cone is in its lowest position.

A flow control device is described comprising a body including a first flow control member 24a and a second flow control member 24b, each of which is provided with apertures or recesses 30, 36, 38, the apertures or recesses 30 of the first flow control member 24a overlapping the openings or recesses 36, 38 of the second flow control member 24b to define a flow path extending between a first surface 26 of the body and a second surface 28 of the body, wherein the shapes and/or sizes of at least some of the apertures or recesses 30, 36, 38 of at least one of the flow control members 24a, 24b are adapted to promote tangential or transverse fluid flow within the body.