Industrial non-rising stem gate valves with flanged connections are commonly used in various industrial applications where reliable flow control and ease of installation are essential. These valves feature a non-rising stem design, where the stem remains stationary while the gate moves up and down within the valve body to control the flow of fluid. Here’s a detailed overview:

1. Design: Non-rising stem gate valves with flanged connections consist of a gate, a stem attached to the gate, a bonnet, and a handwheel or actuator. The gate moves vertically within the valve body to open or close the flow passage, while the stem remains stationary. Flanged connections allow for easy installation and maintenance by bolting the valve between two flanges in the pipeline.

2. Flanged Connections: Flanged connections provide a secure and leak-tight connection between the valve and the pipeline. The valve body and bonnet feature flanges with bolt holes that align with matching flanges on the pipeline. Gaskets are placed between the flange faces to ensure a tight seal when the bolts are tightened.

3. Non-rising Stem Design: In non-rising stem gate valves, the stem remains stationary while the valve is operated, which is advantageous in applications with limited vertical space. The stem is typically threaded into the gate and rotates with the handwheel or actuator, transmitting the motion to the gate to control the flow of fluid.

4. Materials: Non-rising stem gate valves with flanged connections are available in various materials to suit different applications and operating conditions. Common materials include carbon steel, stainless steel, cast iron, bronze, and various alloys. The choice of material depends on factors such as the fluid being handled, temperature, pressure, and corrosion resistance requirements.

5. Pressure Rating: Non-rising stem gate valves with flanged connections are available in various pressure ratings to suit different applications and operating conditions. Common pressure ratings include Class 150, Class 300, Class 600, Class 900, and Class 1500, depending on the ANSI standard or equivalent.

6. Size Range: These valves are available in a wide range of sizes to accommodate different pipeline diameters and flow rates. Standard sizes typically range from 2 inches to 48 inches or larger, although custom sizes may be available upon request. The valve size should be selected based on the pipeline size and flow requirements of the application.

7. Applications: Non-rising stem gate valves with flanged connections are widely used in industries such as oil and gas, petrochemical, water treatment, power generation, and manufacturing. They are suitable for both on-off and throttling applications and can handle a wide range of fluids, including water, steam, oil, gas, and chemicals.

8. Actuation: These valves can be operated manually using a handwheel or equipped with pneumatic, hydraulic, or electric actuators for automated operation. Actuators provide remote control and can be integrated into control systems for process automation and optimization.

9. Quality and Testing: Non-rising stem gate valves with flanged connections undergo rigorous quality control and testing procedures to ensure compliance with relevant standards and performance requirements. This may include hydrostatic testing, pneumatic testing, material testing, and dimensional inspection.

Overall, non-rising stem gate valves with flanged connections are critical components used in industrial piping systems to control the flow of fluids. Their ease of installation, reliability, and compatibility with flanged piping systems make them suitable for a wide range of applications across various industries. Proper selection, installation, operation, and maintenance are essential to maximize the performance and efficiency of these valves in industrial processes.