Valve gate hot runner injection mold has many advantages

Valve gate hot runner injection mold has many advantages. When the resin melt viscosity is low, avoid drooling phenomenon; higher temperature can be reduced when drawing phenomenon. Spool into the front gate and cavity flush products basically without leaving traces of the gate. Valve gate can be opened and closed as required to  Compression fitting  the feeding time, broaden the range of processing, reduce internal stress of plastic parts. Reduce stress cracking and warpage, increase the dimensional stability of plastic parts. Further, gate valve before opening the valve can be subjected to the pre-injection machine barrel pressure,  Valve manifolds  of the plastic produced, the moment when the gate is open, the rapid expansion of the volume of the pre-compression, greatly shorten the filling time shorten the cycle. Because the valve gate has so many advantages, it is widely adopted.

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 .

Fuel supply system must be precisely controlled by the flow valve

Scramjet engine fuel flow regulator is proportional flow control valve to achieve. Since the flow control valve into the first fuel for cooling the engine , into the engine for combustion , and thus the fuel through the flow control valve temperature up 400 ~ 500 ° C. Fuel feed speed control for fuel combustion and engine performance  High pressure ball valve  are essential, so the fuel supply system must be precisely controlled by the flow valve . High temperature environment has the potential to bring the following temperature flow regulating valve problems: First , the flow control valve does not have a temperature resistance to high temperature ,   Needle valve  and corrosion-resistant properties ; secondly , because of the flow control valve at room temperature under high temperature and large thermal expansion coefficient a small yield stress and thermal Compression fitting , the spool movement of the valve sleeve affected, leading to failure of the flow control valve adjusted . Thus high thermodynamic characteristics of the flow control valve analysis is crucial, particularly the flow control valve moving friction with the surface size of the gap , if the working member between the amount of thermal deformation due to material and structure in the first and the larger , then it may movement can cause friction with the gap grows or shrinks , if the gap increases, the result is bound to make the seal gap increased fuel leakage ;

Valve pipe before there media, such as improper operation will cause pump impeller Rewind

Reducing structural characteristics of the design check valve check valve is to rely on the media selected energy afloat turned off automatically when backflow valve. Petrochemical  Valve manifolds  the installation of the pump outlet check valve, the past is the main and standby pumps were equipped with a check valve, are installed in horizontal pipelines, far away from the pump, check there before the pipeline medium, such as improper operation, will cause pump impeller reversed. According to  High pressure ball valve  & Chemical Corporation, the industry standard requirements, each pump check valve must be installed, and require as close to the pump, mounted on the front of the pump outlet valve. Click here to claim  Compression fitting , structure, length is too long, resulting in the pump outlet valve height is too high, causing inconvenience to the operation and maintenance; simultaneously swing check valve is easy to produce water hammer pressure drop Japanese have not any position installation disadvantages. To reduce the height of the outlet valve in the structure, so preventing water hammer, lower pressure drop, with the domestic pump characteristics and process requirements, the development of a new type of valve, the valve diameter.