The lift check valve is a type of check valve that operates by the pressure of the fluid flow to lift the disc and allow flow in one direction while preventing backflow when the flow stops or reverses. In China, as in other regions, lift check valves may feature various stem designs, each offering unique characteristics and benefits.

Some common stem designs used in lift check valves manufactured in China include:

1. Rising Stem: In this design, the stem moves vertically upwards when the valve is opened and downwards when closed. The rising stem provides a visual indication of the valve position, making it easier to monitor the valve’s status.
2. Non-Rising Stem: In contrast to the rising stem design, the non-rising stem does not move vertically when the valve is operated. Instead, the stem remains stationary while the disc lifts or lowers. Non-rising stem designs are often used in applications with limited vertical space.
3. Axial Flow Stem: This stem design features a stem that moves along the same axis as the flow direction. Axial flow stems offer smooth operation and reduced friction compared to other stem designs, making them suitable for high-flow applications.
4. Slanted Stem: In slanted stem designs, the stem is inclined at an angle relative to the flow direction. This configuration allows for easier operation and reduced wear on the stem components, particularly in applications with high velocities or abrasive fluids.
5. Top Entry Stem: In top entry stem designs, the stem enters the valve body from the top rather than the bottom or side. This configuration simplifies maintenance and repair procedures since the valve internals can be accessed without removing the valve from the pipeline.
6. Bottom Entry Stem: Conversely, in bottom entry stem designs, china lift check valve  the stem enters the valve body from the bottom. This configuration is often used in applications where space constraints or operating conditions necessitate a different stem entry point.
7. Integral Stem and Disc: Some lift check valves feature an integral stem and disc design, where the stem is directly connected to the disc without separate components. This design enhances valve reliability and reduces the risk of stem or disc detachment during operation.
8. Threaded Stem: Threaded stem designs feature threads along the stem shaft, allowing for precise adjustment of the disc position and sealing force. Threaded stems are often used in applications requiring fine control over the valve operation.

These are just a few examples of the stem designs that may be used in lift check valves manufactured in China. The choice of stem design depends on factors such as the application requirements, operating conditions, and industry standards. It’s essential to consider these factors carefully when selecting a lift check valve to ensure optimal performance and reliability in the intended application.