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Valve manually by hand wheels, handles to operate the valves in the petrochemical plant application is widespread, the operator should pay attention to the following points:
◆ valve opening direction, usually counterclockwise said valve open, close the valve clockwise said. Therefore, the switching valve to the attention of the direction of
◆ valve handle, hand wheel size is based on human valve switching design. Therefore, as long as hand-rotating valve switch can be realized, the general is not allowed to use a lever or switch valve wrench. In order to prevent too much force, sealing surface damage and other parts
◆ when the closed valve and open the valve to death points to Rotary 1 / 4 laps to 1 / 2 laps, so close together thread better, so as not to screw too tight, damaged valves
◆ not valve, the cut-off valve so by cutting expenditure, so easy to flush the valve and sealing surface, and the introduction of vibration leakage, damage to the valve
◆ Open the steam valve should be slow to open, rule out the possibility of condensation water pipe to prevent water hammer phenomenon. Damaged valves and piping
◆ Large Diameter of valve, the cut-off valve and butterfly valves, and some have bypass valve, and its role is to balance both sides of the pressure valve to reduce the opening force. So open, they would first open the bypass valve, and then slowly open the valves, valve clearance, the bypass valve should be closed, and then slowly close the main valve
◆ certain valve closed, until the temperature dropped, the valves contraction appears minor leak sealing surface phenomenon, this time, the valve should be closed, once again bear the appropriate valves can
◆ valve opening direction, usually counterclockwise said valve open, close the valve clockwise said. Therefore, the switching valve to the attention of the direction of
◆ valve handle, hand wheel size is based on human valve switching design. Therefore, as long as hand-rotating valve switch can be realized, the general is not allowed to use a lever or switch valve wrench. In order to prevent too much force, sealing surface damage and other parts
◆ when the closed valve and open the valve to death points to Rotary 1 / 4 laps to 1 / 2 laps, so close together thread better, so as not to screw too tight, damaged valves
◆ not valve, the cut-off valve so by cutting expenditure, so easy to flush the valve and sealing surface, and the introduction of vibration leakage, damage to the valve
◆ Open the steam valve should be slow to open, rule out the possibility of condensation water pipe to prevent water hammer phenomenon. Damaged valves and piping
◆ Large Diameter of valve, the cut-off valve and butterfly valves, and some have bypass valve, and its role is to balance both sides of the pressure valve to reduce the opening force. So open, they would first open the bypass valve, and then slowly open the valves, valve clearance, the bypass valve should be closed, and then slowly close the main valve
◆ certain valve closed, until the temperature dropped, the valves contraction appears minor leak sealing surface phenomenon, this time, the valve should be closed, once again bear the appropriate valves can
