A non-return rising stem gate valve, also known as a check valve, is designed to allow flow in only one direction and to prevent backflow in the opposite direction. It is commonly used in applications where backflow can cause damage to equipment or systems, such as in water and sewage systems, oil and gas pipelines, and chemical processing plants. The valve is activated by the pressure of the fluid flowing in the desired direction, which lifts the gate to allow flow. When the flow stops or reverses, the gate closes to prevent backflow.
What is the most common directional rising stem gate valve?
The most common directional rising stem gate valve is the “OS&Y” valve, which stands for “Outside Screw and Yoke.” In an OS&Y valve, the stem that operates the gate is threaded and located on the outside of the valve body, and it moves up and down as it is turned. The yoke is a bracket that connects the stem to the valve body and supports it. china rising stem gate valve When the valve is opened, the stem rises, lifting the gate and allowing fluid to flow through. When the valve is closed, the stem lowers, bringing the gate down and blocking the flow. The OS&Y valve is used in a wide range of industrial applications, including oil and gas pipelines, water treatment plants, and chemical processing facilities, and it is popular because of its durability and reliability.
What is the difference between unidirectional and bidirectional gate valve?
The difference between unidirectional and bidirectional gate valves is based on the direction of flow that the valve is designed to handle.
- Unidirectional Gate Valve: A unidirectional gate valve is designed to allow flow in only one direction. The gate inside the valve is constructed to allow flow in one direction and to prevent backflow in the opposite direction. These valves are typically used in applications where backflow prevention is important, such as in water supply systems or in sewage systems.
- Bidirectional Gate Valve: A bidirectional gate valve is designed to allow flow in both directions. The gate inside the valve is designed to allow flow in both directions, and it can be operated from either side of the valve. These valves are typically used in applications where flow direction may need to be changed, such as in cooling water systems or in some chemical processing applications.
In summary, the key difference between unidirectional and bidirectional gate valves is the direction of flow they are designed to handle. Unidirectional valves allow flow in one direction, while bidirectional valves allow flow in both directions.
