Open rod gate valve, also known as lifting rod gate valve, the valve stem and gate plate move up and down together during the opening and closing process.

      The handwheel drives the stem nut to rotate, and the nut drives the stem up and down when it rotates. The stem does not rotate. There are grooves on the side of the gate plate and a guide boss on the inner wall of the valve, and the two cooperate to play a guiding limit role for the gate plate. The gate plate is connected to the stem end T-head.

     When the open stem gate valve is opened, the valve stem can be seen to rise gradually, and the degree of gate valve opening can be judged by the rise of the valve stem, and the valve can be judged whether the valve is in the open or closed state through the stem position. Therefore, for important occasions, use more open rod gate valves to prevent misjudgment when problems occur.

Working principle (open rod gate valve)

     When the open rod gate valve is opened, the valve stem should rise to the same height as the gate valve diameter, which is good for places with spacious space, but not suitable for places with small space, you can consider dark rod gate valves. 　　 　　Common models are Z41, Z42, Z43, Z44, Z11

Dark rod gate valve is also known as rotary rod gate valve, and the valve stem rotates during the opening and closing process.

     The handwheel drives the valve stem to rotate, and the valve stem drives the gate plate up and down to complete the switching process, and there is also a guide groove between the gate plate and the valve body. Limit and guide the gate. There are internal threads and stem threads in the gate plate.

      When the dark rod gate valve is opened, the valve stem only rotates and does not move up and down. The opening and closing state of the gate valve cannot be viewed from the outside, because there is no change in appearance during its opening and closing process, unlike the open stem gate valve, which can see the rising and falling process of the valve stem. Therefore, important occasions will be equipped with a stem indicator on its appearance, which can distinguish the valve opening and closing status.

Working principle (dark rod gate valve)

     Concealed rod gate valves are suitable for applications where space is limited because there is no change in height when they open. The medium in the pipeline should be clean, and impurities will cause the valve stem and gate thread to jam, resulting in switch failure. The stem and gate thread are eroded and corroded by the medium, and the service life is not as long as the open rod gate valve.