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  Gate Valve is the most widely used one among all types of valves. Gate Valve, whose disc or wedge moves vertically along the axis of the channel, has the same basic function of other valves, turning on or turning off channels. In the pipeline, it is used as a piece to connect and cut off the media inside. What is worthy to be noted is that an ordinary gate valve usually opens or close pipeline completely. In other words, it can’t be used as a controlling device to restrain the volume of the flow. Gate valve can is designed to handle a wide range of situations: high temperature and high pressure or low temperature and low pressure. It also has the ability to deal with a handful of different media except those that are vicious, easy to precipitate or with granules. Gate Valve has the following advantages: 1. small fluid resistance, safe and reliable; 2. small torque when turning it on or off; 3. it can be used in circular network pipelines where the medium flows in both

The 40 G   QSFP + optical module is a product developed on the basis of QSFP . It has four independent optical signal transmitting and receiving channels, which can transmit data at the same time.   It can provide high-density and low-power 40 G  Ethernet connection transmission applications for data center, high-performance computing network, enterprise core layer and distribution layer, as well as telecom operators. Today, ETU-Link  will introduce 40 G   QSFP +  LR4 optical module . Working principle of 40G QSFP+  LR4   optical module The laser driver controls the wavelength of arrival, and the optical signal is transmitted together through the multiplexer.   At the receiving end, these transmitted signals are divided into four channels with transmission rate of 10Gbps by demultiplexer. Then pin detector or mutual resistance amplifier recovers the data stream and transmits the optical signal. 40G QSFP+ LR4  and 40G QSFP+ PSM4   optical module ①The 40 G   QSFP