Gate Industrial Valves installation and maintenance should be paid attention to the following items: the handwheel, handle and transmission mechanism are not allowed for lifting, and it is forbidden to collision. Double disc gate valves should be installed vertically ( The stem in a vertical position, the handwheel at the top) 。 Gate valve with a bypass valve in open open the bypass valve should be taken before, To balance the import and export of pressure difference and reduce the opening force) 。 Belt transmission mechanism of the gate, according to the regulations of the product instruction manual installation. If the valve switch is used, often lubrication at least once a month. Gate valve is used as a cut-off media, through the entire circulation when fully open, the medium run minimal pressure loss. Gate valves are normally applied to don't need to often open/close, and keep the gate full open or full close condition. Is not suitable for use as regulating or throttling. For the high-speed flow medium, ram in local open conditions can cause the vibration of the gate, and vibration and possible damage of disc and seat sealing surface, and the throttling can make gate medium of erosion. From the structure form, the main difference is adopted in the form of packing element. According to the form of sealing element, often the gate valve is divided into several different types, such as: parallel double parallel wedge gate valve, gate valve, gate valve, wedge double disc brake, etc. The most common form is wedge gate valve and parallel gate valve. This type of valve's role is only allowed to medium flows in one direction, the direction and stop the flow. This valve is normally automatic work, in a direction of flow of fluid pressure and valve opening; In the opposite direction of fluid flow, the fluid pressure since the overlap of the disc and the disc on the seat, thereby cutting off flow. The check valve is belong to this type of valve, which includes swing check valve and lift check valve. Swing check valve with the humble hinge institutions, there is also a disc freely like door on the tilt of the seat surface. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, so that the disc with enough space of a swing, and real, comprehensive, and the valve seat contact. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing check valve in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the Industrial Valves is relatively small. Lift check valve on the disc is located in the body of the valve seat sealing surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat sealing surface lift, medium return led to the disc back to seat, and cut off the flow. According to the conditions of use, valve can be all-metal structure, it can also be embedded in disc shelves rubber mat or rubber ring form. Like a cut-off valve, fluid through the lift check valve channel is narrow, so the lift check valve through the pressure drop than the swing check valves are bigger, and swing check valves are very few restrictions. In the process of production, in order to make the medium parameters such as pressure, flow conforms to the requirement of technological process, need to install the regulator to adjust the above parameters. The main working principle of regulating mechanism, it is by changing the valve disc and the circulation between disc and seat area, achieve the purpose of regulating the parameters. Belong to this type of valve are collectively referred to as control valves, which are divided into relying on power driven medium itself is called self drive type control Industrial Valves, such as pressure reducing valve, regulator valve and so on, all that lead up to driving ( Such as electricity, compressed air and fluid power) Called him drive type control valve, such as electric control valve, pneumatic control valve and hydraulic regulator, etc.
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