摘要:
A valve arrangement is provided, (1) comprising: a valve (2) for controlling a flow of heating or cooling fluid through a heat exchanger, an actuator (12) for actuating said valve (2), control means (15) for controlling said actuator (12), a first temperature sensor (18) connected to said control means (15), a thermal resistance between the first temperature sensor (18) and the valve (2) being greater than a thermal resistance between the second temperature sensor (19) and the valve (2). It is intended to improve control of the valve. To this end the first temperature sensor (18) and the second temperature sensor (19) are part of detector means detecting a closing condition of the valve (2).
摘要:
Disclosed is a sheath delivery system that uses a continuous flow of sheath fluid into a pressurized internal reservoir that substantially matches the outflow of sheath fluid through the nozzle of a flow cytometer. A substantially constant level of the sheath fluid is maintained. If the sheath fluid level falls below a desired level, or goes above a desired level, a dampened control system is used to reach the desired level. In addition, air pressure in the pressurized internal container is controlled so that an external sheath container can be removed and refilled with additional sheath fluid without stopping the sheath delivery system 100. Differences in pressure are detected by a droplet camera, which measures the droplet breakoff point to determine the pressure of the sheath fluid in the nozzle.
摘要:
There are provided a valve control system, a bidet using the same, and a valve control method. The valve control system includes a latch valve controlling a stream of water in a pipe; a flow rate sensor measuring a flow rate in the pipe; and a valve control device controlling the operation of the latch valve. The valve control device determines whether or not the latch valve is malfunctioning upon analyzing a flow rate measured by the flow rate sensor. When the latch valve is malfunctioning, the valve control device controls the latch valve to re-operate.
摘要:
A method and apparatus comprising a structure (204) and a chamber (210) within the structure (204). The structure (204) has an input port (206) and an output port (208). The chamber (204) is configured to channel a fluid (212) from the input port (206) to the output port (208) of the structure (204). A volume (214) of the chamber (210) is configured to change such that a frequency (216) at which the fluid 212) flows out of the output port (208) changes at the output port (208).
摘要:
Collection enhanced materials, down stream additives, and methods of making the enhanced materials and down stream additives are provided. In one embodiment, a down stream additive is provided that includes an active phase component and at least one of a collection enhancing component. In other embodiments, the down stream additive may have attrition index from about two (2) to about ten (10) and/or an average diameter from about 20 μm to about 60 μm. In other embodiments, the down stream additive may have an active phase component which is incompatible with a process performed in an FCC unit. In yet another embodiment, a collection enhanced material having an average diameter from about 60 μm to about 300 μm is provided that includes an active component and a collection enhancing component.
摘要:
Pumping cassettes are disclosed. Each cassette includes a housing, at least one fluid inlet and at least one fluid outlet as well as at least one reciprocating pressure displacement membrane pump in fluid relation to the cassette. The balancing cassette includes at least one balancing pod in fluid connection. The mixing cassette includes at least one mixing chamber in fluid connection. The system includes a mixing cassette, a balancing cassette, and an outer or middle cassette fluidly connected to the mixing cassette and the balancing cassette and at least one pod. The mixing cassette is fluidly connected to the middle cassette by at least one fluid line and the middle cassette is fluidly connected to the balancing cassette by at least one fluid line. The at least one pod is connected to at least two of the cassettes wherein the pod is located in an area between the cassettes.
摘要:
A digital valve positioner for use with an actuator. The digital valve positioner includes a housing, at least one exhaust port opening formed in the housing, and a vent assembly operatively coupled to the at least one exhaust port opening. The vent assembly includes a body having a bore, a valve seat surrounding the bore, and a check valve disposed within the bore. The check valve is arranged to shift from a closed position seated against the valve seat to an open position disposed away from the valve seat. A plurality of barriers is disposed around and positioned to enclose the check valve. The plurality of barriers is arranged to prevent an external medium from entering the check valve and to provide a tortuous flow path for the exhaust medium reducing sound through the vent assembly.