Valve installation and flange welding
Classification:
Release Time：2018-01-14
1, the installation of the valve valve installation is best to use the ring installation, the use of chain installation, pay attention to the valve coating to take protective measures. When the valve is equipped with a bracket or transmission mechanism, the lifting rope should be fixed on the valve lifting ring, and the lifting rope cannot be placed on the transmission mechanism; the lifting rope or lifting chain cannot squeeze the external parts of the valve and its extension rod, so as not to damage the valve actuator, resulting in the valve can not be opened or closed difficult. 2. Welding of the valve (1) After the valve is in place, the valve should be placed in the fully open position during preheating and welding of the valve. Otherwise, during the welding process, the gate of the gate valve will be stained with welding slag, which will be attached during production.
1Installation of valve
It is best to use the lifting ring to install the valve. When installing the chain, pay attention to the protective measures for the outer coating of the valve. When the valve is equipped with a bracket or transmission mechanism, the lifting rope should be fixed on the valve lifting ring, and the lifting rope cannot be placed on the transmission mechanism; the lifting rope or lifting chain cannot squeeze the external parts of the valve and its extension rod, so as not to damage the valve actuator, resulting in the valve can not be opened or closed difficult.
2. Welding of valve
(1) After the valve is in place, the valve should be placed in the fully open position during preheating and welding of the valve. Otherwise, during the welding process, the gate of the gate valve will be stained with welding slag. These attached welding slag will scratch the valve seat seal when it is put into production, resulting in internal leakage of the valve and failure of the valve in serious cases.
(2) The valves must be supported on their respective bases or supported separately.
(3) After the valve is welded, if the valve needs to be rotated, a manual grease injection gun should be used to add grease.
(4) Confirm that the sewage outlet and pressure outlet are closed.
(5) must be in accordance with the valve body on the arrow mark to install, can not be installed.
3. Requirements for valves after welding
(1) before the valve after welding pressure test, should be injected with grease to ensure that the valve sealing surface is filled with grease, and the impurities attached to the valve seat sealing surface during welding are discharged with grease.
(2) Check the valve condition to ensure that all external joints are locked without looseness; confirm that the sewage outlet and pressure outlet are locked to prepare for pressure test.
(3) Operate the valve according to the pressure test plan to make the valve in the specified position.
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