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1. Working principle and purpose of Dwyer Flow Switch
Dwyers Flotect V4 flow switch is a sturdy device that automatically protects the hail system when the flow decreases or disappears, and has been widely used worldwide. Its unique magnetic switch design ensures stable performance, and through the interaction between the blades and magnets, a lever mechanism is used to achieve fast switching without the need for maintenance of bellows, springs, or seals. The Flotect V6 flow switch is designed to be compact and suitable for monitoring liquid, gas, or air flow. It adopts magnetic operation without mechanical connection, and controls the switch by controlling the magnet. The flow rate change in the normally open state will cause the blade spring to push the blade, triggering the alarm or shutdown function. The V8 flow switch provides comprehensive protection and is only allowed to operate when there is sufficient flow in the normally open state. When the flow stops, the leaf spring will close the switch, driving a 5A @ 120/250 VAC single pole double throw switch to control motors, pumps, or engines to prevent damage to unmanned equipment. V8 also features leak proof design, using PPS blades and chemically resistant materials, suitable for various chemical processes and industrial environments. The adjustment options for pipe diameters of 1-6 inches, as well as a working pressure of up to 150 PSI, make it suitable for various production conditions. For budget sensitive users, the V10 traffic switch is a reliable traffic detection device that can monitor automation systems and prevent damage. It adopts an airtight reed switch, which is easy to adjust the switch status on site, and the shell design ensures that the
2. What is the difference between OpenFlow and Open vSwitch in SDN
SDN stands for Software Control Network.. The device that controls the network is the SDN controller, which is independent of the routers and switches in the network. The SDN controller communicates with other devices in the network to control them, such as writing routing tables. Other devices also report to the SDN controller, such as reporting the discovery of new network traffic. During this process, the communication protocol is OpenFlow, and the switch in the network supports this protocol. OpenVSwitch is a software (program component) that appears as a switch that supports the OpenFlow protocol in network simulation systems. OpenVSwitch is not hardware. Compared to physical switches that support OpenFlow, OpenVSwitch has these differences: the computing power (traffic throughput) of real-world switches is limited by hardware factors such as physical memory, processors, and bandwidth for Ethernet communication. OpenVSwitch is software that is controlled by the operating system during runtime. For some operations of the OpenFlow protocol, the implementation details are not specified in the protocol standards, and the implementa