The downstream part of the riser is circulating fluidized particle circulation loop

The downstream part of the riser is circulating fluidized particle circulation loop. Mobile phase flow characteristics within the riser of a particle along the high gravity from low-end to high-pressure flow of the lower end, this approach has led to volatility in the flow stream state of diversity and flow processes. As part of a circulating fluidized bed riser particles circulatory system, usually installed with a valve for  Instrumentation ball valve  mass flow rate and control of a circulating fluidized bed, such as fluidized catalytic cracker (FCC) of renewable inclined tube slide valve and pending Health chute slide valve. However, the valve  Instrument needle valve  is different from the gas-solid flow valves generally fluid valve opening change will affect the flow pattern inside the standpipe valve before and after the gas-solid flow valve, causing the valve opening change the particle changes in flow rate is a nonlinear relationship, thereby affecting the regulatory effect of the valve. Riser on the particles flow through the valve orifice similar nesting.

Hot runner technology is used in plastic injection mold runner system is an advanced technology

Hot runner technology is used in plastic injection mold runner system is an advanced technology . Hot runner technology used since 1946 since the nozzle extension from the initial to shorten the main channel in the form of a plastic surface condensation to use a thermal insulation principle, development become extinct hot  Instrument needle valve  adiabatic nozzles and other forms of pit . Although these forms compared with cold runner systems each have advantages, but there are still some deficiencies still are , especially for some of the Yi salivation plastic ( such as nylon , etc. ) can not be better suited . With the advances in microelectronics technology , as well as mold temperature control machine development and use , to the hot runner temperature control and mold cooling to arbitrary control , whereby the hot runner technology to advance to a new stage of  Compression fitting . Hot runner nozzle according to the different structure of the system can be divided into open gate valve gate nozzles and nozzle . For valve nozzle has a variety of products available abroad , but domestic targeted research in this area is also very little. Based on this situation , the paper and its needle -gate hot runner injection mold application are discussed. And molds molten resin flow channel had previously compacted to a certain extent . When the mold is closed and locked back after the gate valve needle instantly open the pre-compressed molten resin into the mold cavity filling fast .