摘要:
A flow rate control valve includes a casing provided with an inlet port and an outlet port through which a fluid, the flow rate of which should be controlled, flows in and out, a diaphragm that partitions a space inside the casing into a flow space in which the fluid flows and a working space in which a working medium is present, and a valve body provided on a portion of the diaphragm that opposes the inlet port. The diaphragm is displaced in accordance with a change in the internal pressure of the working space, and the valve body is accordingly moved. This results in a change in the distance between the valve body and the inlet port, and thus the flow rate of the fluid flowing into the flow space through the inlet port is adjusted. Therefore, the flow rate of the fluid flowing out through the outlet port is variably controlled.
摘要:
A valve, preferably of the flow control construction type, has a valve piston or pressure regulator piston mounted in an axially displaceable manner in a valve housing. The valve piston and the valve housing form a damping chamber for the motional damping of the valve piston.
摘要:
The invention relates to an electropneumatic valve for driving a pneumatic actuator drive to activate fittings in automation systems. The valve has at least one electropneumatic transducer and a pneumatic booster, which has at least one 3/3 way valve with a blocking center position for optionally connecting a connecting duct, which can be connected to the actuator drive, to at least one of an air inflow duct and an air outflow duct. The electropneumatic transducer can be configured to activate the duct(s) in accordance with an electrical actuation signal. The pneumatic booster can include at least one sensor for sensing the position of the 3/3 way valve with a locking center position, and outputting a signal indicating the sensed position as feedback to the electrical actuation signal.
摘要:
An apparatus for controlling water flow is provided. The apparatus is a novel electronic water controller capable of operation using a battery-type power source, and providing for achievement of long battery life. The apparatus generally comprises an electronic control module, a vacuum pressure sensor, a trigger switch, a vacuum switching module and a means to electrically connect the electronic control module to a power source.
摘要:
A feed-forward flow controller is designed to calculate a target valve position from a target flow. Correction is made for liquid or gas pressure drop across the valve and for the valve flow modulating member geometry. This feed-forward action may also be used to linearize a feed-back flow control loop.
摘要:
A proportional, pilot-operated flow control valve is disclosed which can include a cage, a hollow compensating spool slidably disposed within the cage, a hollow metering guide member slidably disposed within the compensating spool, a regulating spool slidably disposed within the guide member, a dampening guide slidably disposed inside the compensating spool to define a dampening chamber, a compensating spring disposed inside the dampening chamber and arranged to urge the dampening guide to engage the metering guide and the compensating spool to engage the cage, a regulating spring disposed inside the regulating spool and urging the regulating spool to abut the dampening guide, and a cartridge, the cartridge having a pilot valve assembly and an adaptor, the adaptor mounted to the cage, the pilot valve assembly mounted to the adaptor, the pilot valve assembly including an actuator.
摘要:
The system controls of a pneumatically operated valve using an electrical control signal from a controller. A pilot circuit of the system has multiple piezo valves that are subject to electrical signals from the controller to provide pneumatic output signals to a volume booster circuit of the system. Relatively small volume pneumatic pilot signals from the piezo valves are used to determine the opened or closed state of higher volume valve assemblies of the booster circuit which connect or disconnect the actuator of the valve to be operated with a source of pressurized gas. Both the piezo valves and the booster valve assemblies are subjected to gas at the same operating pressure, but the surface area of pistons in the booster valve assemblies exposed to the piezo valves is substantially larger than the surface area of the pistons exposed to operating pressure such that the pneumatic signals shift the pistons even when pressure is the same on both sides thereof. Both singe-acting and double-acting embodiments are disclosed, as well as alternative versions of booster valve assemblies such as having a primary piston and a secondary piston. The secondary piston permits partial flow while the primary piston permits full flow when actuated.
摘要:
The system controls the position of a pneumatically operated valve using an electrical control signal from a controller. A pilot circuit of the system has multiple piezo valves that are subject to electrical signals from the controller to provide pneumatic output signals to a volume booster circuit of the system. Relatively small volume pneumatic pilot signals from the piezo valves are used to determine the opened or closed state of higher volume valve assemblies of the booster circuit which connect or disconnect the actuator of the valve to be operated with a source of pressurized gas. Both the piezo valves and the booster valve assemblies are subjected to gas at the same operating pressure, but the surface area of pistons in the booster valve assemblies exposed to the piezo valves is substantially larger than the surface area of the pistons exposed to operating pressure such that the pneumatic signals shift the pistons even when pressure is the same on both sides thereof. Both single-acting and double-acting embodiments are disclosed, as well as alternative versions of booster valve assemblies.
摘要:
A flow controller having a first and second stages of regulation. The first stage is a pressure regulation stage that maintains the pressure within an intermediate chamber (formed by a series of interconnected passageways and cavities) within a predetermined range above the pressure in an outlet port. The second stage maintains the flow rate within a predetermined range about a target flow rate. Both stages sample the pressure in the outlet port and automatically adjust the flow of fluid to ensure that fluctuations in pressure at the inlet and outlet ports do not affect the flow rate. The flow rate is set and controlled by a user determined setpoint. The pressure is regulated by one or more feedback systems. The feedback systems used may be mechanical or electromechanical based on a particular operating environment.
摘要:
The system controls the position of a pneumatically operated valve using an electrical control signal from a controller. A pilot circuit of the system has multiple piezo valves that are subject to electrical signals from the controller to provide pneumatic output signals to a volume booster circuit of the system. Relatively small volume pneumatic pilot signals from the piezo valves are used to determine the opened or closed state of higher volume valve assemblies of the booster circuit which connect or disconnect the actuator of the valve to be operated with a source of pressurized gas. Both the piezo valves and the booster valve assemblies are subjected to gas at the same operating pressure, but the surface area of pistons in the booster valve assemblies exposed to the piezo valves is substantially larger than the surface area of the pistons exposed to operating pressure such that the pneumatic signals shift the pistons even when pressure is the same on both sides thereof. Both single-acting and double-acting embodiments are disclosed, as well as alternative versions of booster valve assemblies.