Industrial non-rising stem gate valves with welding ends are commonly used in various industrial applications where reliable flow control and a secure connection between piping components 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 welding ends 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. Welding ends provide a permanent and leak-tight connection between the valve and the piping system.

2. Welding Ends: Welding ends allow for the valve to be welded directly to the pipe or other components of the piping system. The valve body and bonnet feature ends that are designed for welding, typically with a beveled or square end configuration. Welding processes such as butt welding or socket welding are used to join the valve to the piping system.

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 welding ends are available in various materials to suit different applications and operating conditions. Common materials include carbon steel, stainless steel, alloy steel, and other alloys. The choice of material depends on factors such as the fluid being handled, temperature, pressure, and corrosion resistance requirements.

5. Pressure Rating: These valves are available in various pressure ratings to suit different applications and operating conditions. Common pressure ratings include Class 150, Class 300, Class 600, and Class 900, depending on the ANSI standard or equivalent. The pressure rating of the valve should match the maximum operating pressure of the system to ensure reliable performance and safety.

6. Size Range: Non-rising stem gate valves with welding ends are available in a wide range of sizes to accommodate different pipeline diameters and flow rates. Standard sizes typically range from 1/2 inch to 24 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: These valves are widely used in industries such as oil and gas, petrochemical, chemical processing, water treatment, and power generation. 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: Non-rising stem gate valves with welding ends 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: These valves 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 welding ends are critical components used in industrial piping systems to control the flow of fluids. Their permanent and leak-tight connection, reliability, and compatibility with welded 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.