The first type: forged steel gate valve with body cover welded connection, the valve designed according to this connection form, the valve body and the valve cover are fully welded and sealed, and the advantage is that there is no external leakage
The second type: forged steel gate valve with body cover bolted connection, the valve designed according to this connection form, the valve body and the valve cover are connected by bolts, and the wound gasket is sealed, the advantage is that it is easy to maintain. The third type: pressure self-tightening bonnet forged steel gate valve, the valve designed according to this connection form, the valve body and the bonnet are connected by screws, and the internal pressure self-sealing ring is sealed. The advantage is that the greater the internal pressure, the tighter the seal. The better the performance.
Precautions for installation and use of forged steel gate valve:
1. For all kinds of manual valves installed on the insulation pipeline, the handles must not be downward
2. The installation location, height, and direction of import and export must meet the design requirements, and the connection should be firm and tight
3. Appearance inspection must be carried out before installation of forged steel gate valve, and the nameplate of the valve should comply with the provisions of the current national standard “General Valve Mark” GB 12220. For valves with a working pressure greater than 1.0 MPa and which function as a cut-off on the main pipe, strength and tightness performance tests should be carried out before installation, and they can only be used after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve shell and packing should be qualified if there is no leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure should meet the requirements of the GB 50243 standard for the duration of the test, and it is qualified if there is no leakage on the sealing surface of the valve disc.
The above are the characteristics and working principle of the forged steel gate valve, as well as the installation and use precautions of the forged steel gate valve. Hurry up and get up~