Manual block valves are commonly used valves in industrial pipeline systems. Their primary function is to control the flow of fluid through manual operation. Due to their unique design and versatility, manual block valves are widely used in fields such as petroleum, chemical, power, and metallurgy.
The basic structure of a manual block valve includes the valve body, bonnet, disc, stem, and handwheel. Its working principle involves rotating the handwheel to raise or lower the disc, thereby changing the cross-sectional area of the fluid passage to achieve flow regulation or shut-off. When the handwheel is turned clockwise, the stem descends, and the disc gradually contacts the seat, eventually completely closing the passage. Conversely, when the handwheel is turned counterclockwise, the stem rises, and the disc gradually leaves the seat, opening the passage.
Valve body design: The valve body of a manual block valve is usually designed in straight-through, right-angle, or direct-flow styles, suitable for different installation spaces and fluid direction requirements.
Sealing: The disc and seat use plane or cone surface sealing to ensure no leakage when in a closed state. Some high-performance shut-off valves use flexible graphite or metal seals to improve sealing performance and durability.
Ease of operation: The handwheel is ergonomically designed, making it easy to operate and suitable for frequent switching and flow regulation conditions.
Durability: The stem and disc are made of high-quality materials, resistant to corrosion and wear, suitable for various media and conditions.
High precision in flow regulation: Due to the large contact area between the disc and seat's sealing surface, manual block valves have high precision in fine-tuning the flow.
Low closing force: The threaded transmission structure design of the stem and disc ensures that the force required to close the valve is relatively small.
Wide applicability: Manual block valves can be used for high-temperature, high-pressure, low-temperature, and corrosive media, widely applicable in various industrial fields.
Easy maintenance: The valve structure is simple, making it easy to disassemble and repair, especially suitable for conditions requiring frequent maintenance.
Due to their excellent regulation performance and reliable sealing, manual block valves are widely used in the following fields:
Petroleum and natural gas industry: Used to control and regulate the flow of crude oil and natural gas, ensuring the safety and efficiency of the production process.
Chemical industry: Suitable for transporting and regulating various corrosive media such as acids, alkalis, and salts.
Power industry: Used to regulate and control the flow and pressure of steam in the steam pipes of boilers and turbines.
Water treatment systems: Used for flow control and pipeline switching in sewage treatment and water supply systems.
When purchasing and installing manual block valves, the following points should be noted:
Selection based on conditions: Choose the appropriate valve body material and sealing form based on the nature, temperature, and pressure of the media.
Installation position: Manual block valves should be installed in positions convenient for operation and maintenance, avoiding long-term use in high-temperature and highly corrosive environments.
Regular maintenance: Regularly check the valve's sealing performance and operational flexibility, and promptly replace worn seals and stems.
Correct operation: Close by rotating clockwise and open counterclockwise, avoiding excessive force that can damage the stem or disc.
As an important fluid control device, the manual block valve, with its simple structure, ease of operation, and reliable sealing, plays an irreplaceable role in various industrial fields. Through proper selection and correct use, manual block valves can effectively improve production efficiency and safety, meeting the flow control needs under different conditions.
中文
日本語
français
Deutsch
Español
русский
português
العربية
dansk
Svenska
Nederland