A control valve assembly is provided for a fluid treatment system, including a housing having a top portion and a bottom portion secured to the top portion, the housing including an inlet and an outlet. At least two modular chambers are secured in the housing. A first chamber is configured to receive fluid from the inlet and a second chamber is configured to provide fluid to the outlet. A piston is also provided which includes a shaft with a plurality of sealing rings. The piston extends through the housing and through the first chamber and the second chamber. The piston is configured to reciprocate in an axial direction to control the flow of fluid in the control valve assembly.

A valve actuation device for actuating a valve, such as a sanitary valve, in an axial actuation movement for a first valve function, illustratively a shut-off function, and in a rotary actuation movement for a second valve function, illustratively a quantity regulation or mixing function, and to a sanitary valve equipped with such a valve actuation device.

An emergency shut-off device shuts off supply of control oil to a trip-and-throttle valve of a steam turbine and closes the trip-and-throttle valve in an emergency. The emergency shut-off device includes: a cylinder; a piston that slides into the cylinder; a spring that applies a biasing force to the piston; a plurality of piston valves disposed on the piston; and a plurality of chambers that are formed by the piston valves. The control oil is supplied to and drained from the plurality of chambers, and a sliding surface of each of the piston valves has a groove to leak the control oil in a corresponding one of the chambers to another one of the chambers that is adjacent to the corresponding chamber in an axis direction.

The invention provides a waterway switch switching valve, which comprises: valve body, main control valve core and waterway control valve core; the valve body comprises a water inlet channel, a first water outlet and a second water outlet, the number of waterway control valve core corresponds to the number of water outlets one by one, and is divided into the first and second waterway control valve core; the first waterway control valve core and the second waterway control valve core are respectively installed in the valve body; The valve body also comprises a first waterway arranged between the water inlet channel and the first waterway control valve core; and a second waterway between the first waterway control valve core and the second waterway control valve core; when the first waterway control valve core is opened, the first waterway control valve core connects the first waterway with the first water outlet; when the first waterway control valve core is closed, the first waterway control valve core connects the first waterway with the second waterway; when the second waterway control valve core is opened, the second waterway communicates with the second water outlet. The above waterway switch switching valve ensures that there is only one waterway discharge water at most.

A coolant control system for a motor vehicle includes a controller determining whether the output signal of the vehicle satisfies a predetermined driving condition and controlling a coolant control valve including a driving motor. The coolant control valve includes a coolant inflow chamber, a first coolant line, a second coolant line and a third coolant line formed in a valve housing. The coolant control valve further includes a first outer valve, a first inner valve and a second other valve formed in the valve housing, and each of the valves is communicating with each of the coolant lines, selectively and respectively. In addition, each of the valves includes a hole for selectively communicating with a coolant inflow chamber.

A coolant control system for a motor vehicle includes a controller determining whether the output signal of the vehicle satisfies a predetermined driving condition and controlling a coolant control valve including a driving motor. The coolant control valve includes a coolant inflow chamber, a first coolant line, a second coolant line and a third coolant line formed in a valve housing. The coolant control valve further includes a first outer valve, a first inner valve and a second other valve formed in the valve housing, and each of the valves is communicating with each of the coolant lines, selectively and respectively. In addition, each of the valves includes a hole for selectively communicating with a coolant inflow chamber.

A rotary valve rotated by an arm connected to a piston being driven by the pressurized fluid, either water or air. The orientation of the valve body in the valve housing will direct the fluid in one of two directions to move the piston. The arm of the rotary valve is connected to a cam that rotates a shaft connected to the valve body. Two cam rollers are biased towards the outer surface of the rotating cam member. The cam rollers provide a force to the cam to aid in the changing of the orientation of the valve body. There are two bump outs on the cam that correlate to the end of the piston movement so that the rotary valve does not stop at an end point of the piston stroke. The rotary valve may be is utilized in a chemical dosing or chemical application device that is driven by pressurized fluid.

A multi-position airflow control assembly includes a valve body fluidly connected to at least three inflation zones of a cushion, a control assembly partially received by the valve body, the control assembly including a seal member, and an actuation assembly operably connected to the seal member and configured to rotate the seal member relative to the valve body between at least a first position and a second position. In the first position, the seal member is configured to fluidly isolate the at least three inflation zones from each other. In the second position, the seal member is configured to group the at least three inflation zones into a first group of inflation zones being fluidly connected, and a second group of inflation zones being fluidly connected, the first group of inflation zones being fluidly isolated from the second group of inflation zones.

A rotary valve rotated by an arm connected to a piston being driven by the pressurized fluid, either water or air. The orientation of the valve body in the valve housing will direct the fluid in one of two directions to move the piston. The arm of the rotary valve is connected to a cam that rotates a shaft connected to the valve body. Two cam rollers are biased towards the outer surface of the rotating cam member. The cam rollers provide a force to the cam to aid in the changing of the orientation of the valve body. There are two bump outs on the cam that correlate to the end of the piston movement so that the rotary valve does not stop at an end point of the piston stroke. The rotary valve may be is utilized in a chemical dosing or chemical application device that is driven by pressurized fluid.

Embodiments of the invention provide a piston assembly for a control valve in a water softener system. The control valve includes a drive mechanism, one or more fluid passageways, and a seal assembly. The piston assembly includes a main piston moveably received within the seal assembly and including a first end and a second end opposite to the first end, and a shuttle piston moveably received within the seal assembly. The shuttle piston includes a first end and a second end opposite to the first end, and is configured to selectively engage the second end of the main piston to form a seal therebetween and to selectively move relative to the second end of the main piston to form an opening between the second end of the main piston and the first end of the shuttle piston, in response to movement of the main piston.