The use of gate valves mainly includes the following aspects:
Operation method : The operation of gate valve is mainly carried out by hand wheel or handle. Turning the hand wheel clockwise is to close, and turning the hand wheel counterclockwise is to open. When the valve is fully opened, the hand wheel should be turned 1 to 2 times in the opposite direction to reduce the load on the valve stem, allow it to expand slightly due to temperature changes, avoid stuck or damage, and ensure that the valve closing effect is not affected. The gate valve with bypass should be opened before opening to balance the differential pressure in and out and reduce the opening torque.
Installation position : The standard installation position of the gate valve is horizontal pipe with the stem facing up. Although it can also be installed in other locations, such as vertical pipe or horizontal pipe with non-vertical stem, the installation method depends on valve size, operating environment and material characteristics, and may require special design. If non-standard installation is required, clearly indicate the valve direction at the time of ordering.
precautions : During operation, the human body can not be directly against the top of the valve stem, in order to prevent the valve stem from being compressed and sprayed. The switch operation should be smooth, the force should be uniform, and the impact force is strictly prohibited. In general, it can be operated by hand, and avoid using the extra lever to operate the new valve. The design of the strength of the handwheel (handle) is based on the torque value required for operation, so the handwheel (handle) cannot be used as an operating pedal and an arbitrary increase or socket extension lever, or a wrench to increase the torque excessively, and can not use a rope to act on the handwheel (handle), and then use a crane or pulley to operate or lift the valve.
maintenance : The valve should be placed in a dry and ventilated room, both ends of the diameter must be sealed and dustproof; Long-term storage should be checked regularly, and oil on the processing surface to prevent rust; Before installation, carefully check whether the mark is consistent with the use requirements; During installation, the inner cavity and sealing surface should be cleaned to check whether the packing is pressed tightly and whether the connecting bolts are evenly tightened; The valve should be installed in accordance with the allowed working position, but attention must be paid to the convenience of maintenance and operation; In use, the gate valve can not be partially opened to adjust the flow rate, so as not to damage the sealing surface when the medium flow rate is high, it should be fully opened or fully closed; Turn the handwheel when opening or closing, do not use other auxiliary levers; Transmission parts should be lubricated regularly; After installation, regular maintenance should be conducted to clear the dirt in the inner cavity, check the sealing surface and valve stem nut wear.
