fluorine lining gate valve

How to choose the bellows globe valve accurately

by:Lianke Valve     2022-08-02
Precautions before installation Before installation, carefully check whether the model, pressure, and diameter of the valve meet the requirements. The direction indicated by the arrow should be consistent with the flow direction of the pipeline medium, and the installation can be performed after confirmation. Before installation, ensure that the inner cavity and sealing surface are clean, and check the sealing surface, bolt connection, packing compression, and whether the valve stem rotates freely. For the valve on the horizontal pipeline, the valve stem should preferably be vertically upward, and it is not suitable to install the valve stem downward; the valve stem downward is not only inconvenient to operate and maintain, but also easy to corrode the valve. The valve installed on the pipeline should have space for operation, maintenance, and disassembly, and the reserved space for the handwheel should not be less than 100mm. For valves with flange end structure, users should select appropriate studs and gaskets according to the operating temperature, operating pressure, and operating medium, and tighten the connecting bolts and nuts evenly and symmetrically. For valves with butt-welded end structure, the user should carry out welding and heat treatment according to the standard requirements. When opening or closing the valve, attention should be paid to the stroke of the positioning piece. Do not open or close it simply and roughly. Excessive force with the 'F' wrench will easily lead to distortion of the bellows and damage to the internal parts. Precautions for use After the valve is installed, if the medium temperature is greater than 100 ℃, the packing gland should be gently opened to fully evaporate the water in the cavity formed by the bellows and the packing, and then the packing gland should be tightened. The bellows globe valve and bellows gate valve must be in the fully open or fully closed position when the system or pipeline is pressure tested, and must not be partially opened to adjust the flow. The manufacturer is not responsible for any harm caused by such uses. Usually the bellows valve has no insulation part, when the medium is high temperature or low temperature fluid, do not touch the surface of the valve to prevent burns or frostbite. The surface and moving parts of the valve, such as the trapezoidal thread of the valve stem and the valve stem nut, the sliding parts of the valve nut and the bracket, are prone to accumulation of dust, oil and medium residues, which are prone to wear and corrosion of the valve and even generate frictional heat, which is harmful to the flammability. The gas is very dangerous and should be cleaned frequently according to the working conditions. If there is water in the valve cavity, under the condition of low temperature (such as liquid nitrogen), the switch will easily cause damage to the bellows. The water should be drained before installation to avoid the phenomenon of freezing in the valve cavity.
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