Views: 0 Author: J-VALVES Publish Time: 2024-04-25 Origin: Site
Wedge gate valve: This is the most common type of gate valve. The design of its gate plate forms a certain angle with the fluid flow direction, and it is usually used for the control of high-pressure and viscous media. The wedge gate valve can be further subdivided into single-gate plate, double-gate plate and elastic-gate plate, which are suitable for different working conditions.
Parallel gate valve: The gate plate of this gate valve is perpendicular to the fluid flow direction, and it is suitable for low-pressure and large-diameter pipeline systems. The parallel-gate-plate design helps to reduce fluid resistance and improve flow efficiency.
Rising-stem gate valve: The threaded part of the valve stem is exposed outside, which makes it easy to identify the opening and closing state of the valve. It is suitable for occasions where frequent operation is required. However, this design is prone to corrosion and damage in harsh environments.
Non-rising-stem gate valve: The threaded part of the valve stem is located inside the valve body, which is not easily affected by the external environment. It is suitable for occasions with limited space or requiring concealed operation. However, this design is not convenient for observing the opening and closing state of the valve, and usually an additional indicating device is needed.
Knife-gate valve: It is particularly suitable for media containing solid particles, such as slurries or powdered materials. The knife-gate-plate design helps to cut and move viscous media, ensuring the tightness of the valve.
II. Key Points for Selecting Gate Valves
This includes the corrosiveness, temperature, pressure, viscosity of the medium, and whether it contains solid particles. These characteristics directly affect the selection of valve materials and the durability of the valve. For example, for corrosive fluids, valves made of highly corrosion-resistant materials such as stainless steel or special alloys are required.
(2) Operating Pressure and Temperature
Select appropriate valve materials and designs based on the operating pressure and temperature of the pipeline system to ensure the reliability and safety of the valve under extreme conditions. For example, high-temperature fluids require valves to have good high-temperature resistance to ensure safe and stable operation.
The connection methods of gate valves include flange connection, threaded connection, and welding. When selecting, the compatibility of the pipeline system and the convenience of maintenance need to be considered. For example, flange-connected gate valves are stable and reliable when used in pipelines, can withstand high pressures, and are suitable for high-pressure pipelines.
According to the frequency of operation and the degree of automation, select an appropriate operating mode, such as manual, electric, or pneumatic. In cases of frequent operation, electric or pneumatic valves may need to be considered to improve efficiency.
The sealing performance of a gate valve is one of its most important technical indicators. The choice between soft-sealed gate valves and hard-sealed gate valves depends on the cleanliness of the medium and the requirements for sealing performance.
