The opening or closing stroke of the valve stem of the bellows gate valve is relatively short, and it has a very reliable cut-off function. Because the change of the valve seat opening is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for cutting off or regulating as well as throttling.

1. The handle of all kinds of manual valves installed on the insulation pipeline shall not be downward.

2. The installation position, height, inlet and outlet shall meet the design requirements, and the connection shall be firm and tight.

3. The appearance of corrugated pipe gate valve shall be inspected before installation, and the nameplate of the valve shall comply with the provisions of the current standard General Valve Signs GB12220. For valves with working pressure greater than 1.0MPa and which can cut off the main pipe, strength and tightness tests shall be carried out before installation, and they can only be used after being qualified. During the strength test, the test pressure shall be 1.5 times of the nominal pressure, and the duration shall not be less than 5min. The valve shell and packing shall be qualified if there is no leakage. During the leak test, the test pressure is 1.1 times of the nominal pressure; The test pressure shall meet the requirements of GB50243 standard for the duration of the test, and it is qualified if there is no leakage on the sealing surface of the valve flap. The opening or closing stroke of the valve stem of the bellows gate valve is relatively short, and it has a very reliable cut-off function. Because the change of the valve seat opening is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for cutting off or regulating as well as throttling.

1. The handle of all kinds of manual valves installed on the insulation pipeline shall not be downward.

2. The installation position, height, inlet and outlet shall meet the design requirements, and the connection shall be firm and tight.

3. The appearance of corrugated pipe gate valve shall be inspected before installation, and the nameplate of the valve shall comply with the provisions of the current standard General Valve Signs GB12220. For valves with working pressure greater than 1.0MPa and which can cut off the main pipe, strength and tightness tests shall be carried out before installation, and they can only be used after being qualified. During the strength test, the test pressure shall be 1.5 times of the nominal pressure, and the duration shall not be less than 5min. The valve shell and packing shall be qualified if there is no leakage. During the leak test, the test pressure is 1.1 times of the nominal pressure; The test pressure shall meet the requirements of GB50243 standard for the duration of the test, and it is qualified if there is no leakage on the sealing surface of the valve flap.