The Difference between Non-Rising Stem and Rising Stem Gate Valves
The hand wheel drives the stem nut to rotate. When the nut rotates, the stem moves up and down. The stem does not turn. The side of the gate has a groove, and the inner wall of the valve body has a guide boss. Both of them cooperate with each other to guide and limit the gate. The gate is attached to a T-shaped head at the end of the stem.
The rising stem gate valve
The gate valve is one of the most widely used valves in the market. According to the type, it can be divided into the rising stem gate valve and the non-rising stem gate valve. Let's talk about how they work, their advantages and disadvantages, and their differences in use.
Working principle: The stem of the gate valve drives the gate plate to move up and down. The stem is outside the valve body. The driving thread of the stem can be seen. The opening and closing positions of the gate can be seen. According to the movement direction and position of the valve stem, we can make an intuitive judgment.
As the rising stem gate valve opens, you can see the stem gradually rising. The opening of the gate valve can be judged by the rise of the stem. Whether the valve is open or closed, we can judge it by the position of the stem. Therefore, on important occasions, the rising stem gate valve is often used to prevent misjudgment when there is a problem.
1. The lifting screw of the flange gate valve only rotates and does not move up and down. Only one pole was visible, and its nut was fastened to the door. The gate is lifted by screw rotation, and the gantry is not visible. The lifting screw of the lever flange gate valve is exposed, and the nut is firmly attached to the handwheel and fixed (no rotation or axial movement). Lift the gate by rotating the screw. There is no relative axial displacement and the appearance of the portal bracket.
2. We can not see the lead screw of the rising stem gate valve, but we can see it in the open rod valve.
3. When the gate valve is on and off, the steering wheel and the valve stem are connected together and relatively stationary.
The disc liftgate is opened and closed by rotating the stem at a fixed point. The disc can be raised or lowered by the rotation of the stem and steering wheel. The rising stem gate valve is a disc that is connected to the stem. It moves up and down together with the steering wheel. It is always at a fixed point. When the gate valve is opened, the stem only turns and does not move up and down. The opening and closing state of the gate valve is not visible from the outside because the appearance does not change during the opening and closing process, which is unlike the rise and fall of the stem gate valve. Therefore, on important occasions, a stem indicator is installed on its exterior to distinguish the valve switch status. Non-rising stem gate valves are suitable for applications where space is limited because their height does not change when opened. The medium in the pipeline should be clean. Impurities will cause the stem and ram thread to stick, resulting in a switch failure. The stem and gate thread are corroded by the medium. The service life is not as good as that of the open stem gate valve.
The rising stem gate valve
The gate valve is one of the most widely used valves in the market. According to the type, it can be divided into the rising stem gate valve and the non-rising stem gate valve. Let's talk about how they work, their advantages and disadvantages, and their differences in use.
Working principle: The stem of the gate valve drives the gate plate to move up and down. The stem is outside the valve body. The driving thread of the stem can be seen. The opening and closing positions of the gate can be seen. According to the movement direction and position of the valve stem, we can make an intuitive judgment.
As the rising stem gate valve opens, you can see the stem gradually rising. The opening of the gate valve can be judged by the rise of the stem. Whether the valve is open or closed, we can judge it by the position of the stem. Therefore, on important occasions, the rising stem gate valve is often used to prevent misjudgment when there is a problem.
1. The lifting screw of the flange gate valve only rotates and does not move up and down. Only one pole was visible, and its nut was fastened to the door. The gate is lifted by screw rotation, and the gantry is not visible. The lifting screw of the lever flange gate valve is exposed, and the nut is firmly attached to the handwheel and fixed (no rotation or axial movement). Lift the gate by rotating the screw. There is no relative axial displacement and the appearance of the portal bracket.
2. We can not see the lead screw of the rising stem gate valve, but we can see it in the open rod valve.
3. When the gate valve is on and off, the steering wheel and the valve stem are connected together and relatively stationary.
The disc liftgate is opened and closed by rotating the stem at a fixed point. The disc can be raised or lowered by the rotation of the stem and steering wheel. The rising stem gate valve is a disc that is connected to the stem. It moves up and down together with the steering wheel. It is always at a fixed point. When the gate valve is opened, the stem only turns and does not move up and down. The opening and closing state of the gate valve is not visible from the outside because the appearance does not change during the opening and closing process, which is unlike the rise and fall of the stem gate valve. Therefore, on important occasions, a stem indicator is installed on its exterior to distinguish the valve switch status. Non-rising stem gate valves are suitable for applications where space is limited because their height does not change when opened. The medium in the pipeline should be clean. Impurities will cause the stem and ram thread to stick, resulting in a switch failure. The stem and gate thread are corroded by the medium. The service life is not as good as that of the open stem gate valve.
