Installation and Precautions of Cast Steel Gate Valve

Ⅰ. Installation and use of cast steel gate valve

  • (1) Before installing cast steel valves, it is necessary to check different parts such as the cavity and sealing surface to avoid dirt or sand particles attached.
  • (2) The bolts of each connection part should be tightened evenly.
  • (3) The packing parts should be pressed tightly to ensure the sealing of the packing and the flexible opening of the gate.
  • (4) Before installing the cast steel valve, you have to check the valve model and connection size as well as pay attention to the flow direction of the medium to ensure consistency with the valve requirements.
  • (5) When installing the valve, you have to reserve the necessary space for the valve drive.
  • (6) The wiring of the drive device should be carried out according to the circuit diagram.
  • (7) The cast steel gate valve should be maintained regularly. It should not be collided and squeezed to protect the sealing effect.

Ⅱ. Notes for installation of cast steel gate valve

  • (1) The installation position, height, import and export direction should meet the design requirements, and the connection should be firm and tight.
  • (2) The handle of all types of manual valves installed on the insulation pipe should not be downward.
  • (3) The visual inspection must be carried out before installing the valve. The valve should meet the requirements of the current national standard “General Valve Mark” GB 12220. For the valve whose working pressure is greater than 1.0 MPa and plays a cutting role on the main pipe, the strength and tight performance test should be carried out before installation, and it can be used only after qualification. 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 without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure, and the test pressure should meet the requirements of the GB 50243 standard for the duration of the test. The sealing surface of the valve disc is qualified if there is no leakage.

Notes:

  • (1) The handwheel, handle and transmission mechanism are not allowed to be used for lifting. Also, collision is strictly prohibited.
  • (2) The double disc gate valve should be installed vertically (the valve stem is in the vertical position and the handwheel is on the top).
  • (3) The bypass valve of the gate valve should be opened firstly (to balance the pressure difference between the inlet and outlet and reduce the opening force).
  • (4) The gate valve with a transmission mechanism should be installed according to the provisions of the product instruction manual.
  • (5) You should lubricate cast steel valves once a month if they are frequently used.

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ZECO Valve is established in 1991, as a professional industrial valve manufacturer and water valve manufacturer in Shanghai, China.

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