Bottom Outlet Valve | Glass-Lined Outlet Valve

Accessories for Glass-Lined Equipment

Bottom Outlet Valve / Glass-Lined Outlet Valve

The bottom outlet valve gives you safer and more controlled discharge from a glass-lined reactor, especially when handling corrosive process media. Designed for reliable outlet control, the bottom outlet valve is widely used in the chemical and pharmaceutical industries for the discharge of strongly corrosive materials.

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Manufactured in accordance with HG/T 20580, the bottom outlet valve uses a carbon steel body with an internal 0.8-2.0 mm high-borosilicate glass enamel lining. The enamel layer must pass a 20 kV high-voltage spark test, with a bonding strength of ≥30 MPa. The bottom outlet valve is available in both straight-through and angle-type designs, with sizes ranging from DN25 to DN100. Suitable operating conditions include pressure up to 1.6 MPa and temperature from -20°C to 200°C.

Options

Different Plug Sealing Structures
According to the sealing form of the valve plug, the bottom outlet valve can be divided into top-guided outlet valves and bottom-guided outlet valves. The top-guided outlet valve is the most widely used option and helps reduce the risk of blockage at the discharge outlet.
Different Actuation Methods
According to the opening and closing method, the bottom outlet valve can be configured as a manual valve, pneumatic valve, or electric valve. These options make it easier to connect the bottom outlet valve with the control system for automated operation.
Different Cleanliness Options
According to cleanliness requirements, the bottom outlet valve is available in a standard type and a purge type. The purge port can use clean water, compressed air, or inert gas to remove residual material from inside the valve.
Different Sealing Options
According to the sealing structure, the bottom outlet valve can use either packing sealing or bellows sealing. The bellows-sealed type offers better sealing performance and is more commonly used.
Optional Temperature Measurement Function
A tantalum pin and sensor can also be installed on the valve plug to provide temperature measurement. This function is only suitable when the process material is in a pure liquid state.

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Why Us

Certified manufacturing standards
We hold authoritative ASME (Section VIII Division 1) and CE (PED) certifications, ensuring full compliance with international safety and quality standards. This guarantees our glass-lined steel equipment meets the strict regulatory requirements of global chemical, pharmaceutical, and agrochemical clients.
In-House Enamel R&D Laboratory
Our dedicated in-house R&D center specializes in custom enamel formulations, including acid-resistant, acid-alkali resistant, high-temperature resistant, and wear resistant options. These proprietary formulas deliver exceptional durability against corrosive media, mechanical impact, and thermal shock, ensuring reliable performance in diverse operating environments.
Advanced Cold Spray Enameling Process
Our glass-lined equipment utilizes advanced cold spray enameling process with multiple high-temperature firing cycles. This technology ensures a thinner, more uniform, and denser enamel layer with significantly reduced risk of chipping or peeling. The controlled firing process guarantees optimal adhesion and long-term durability in the most demanding chemical processing conditions.

Precision Belt Polishing Pretreatment
Prior to enameling, every steel shell undergoes rigorous precision belt polishing to thoroughly remove mill scale, pits, and surface impurities. This meticulous pretreatment process ensures superior substrate smoothness and integrity, providing an ideal, contamination-free foundation for strong and uniform enamel bonding.
Multi-zone electric furnace control
The enameling furnace uses independent multi-zone control with computerized management of heating, holding, and cooling. The temperature difference inside the furnace is controlled within 5°C, helping maintain consistent firing quality.
Vertical firing process
All equipment is produced using a vertical firing process, which provides more even heating, reduces deformation, and helps maintain the overall appearance of the equipment as well as flange flatness.
Controlled slow firing curve
The firing process follows a low-temperature entry and low-temperature exit slow-firing curve. Combined with dedicated furnace tooling and controlled firing methods, this helps ensure enamel quality comparable to that of established international manufacturers.
Full-process quality management
We maintain a complete quality management system with full-process control. For glass-lined quality inspection, we apply three inspection procedures covering:
1. internal and external visible defects
2. enamel thickness
3. high-voltage spark testing
This helps ensure that delivered products meet required standards and specifications.
Custom non-standard equipment design and manufacturing
Custom design and manufacturing support is available for non-standard products. Based on different process requirements, tailored solutions can be developed for special equipment structures and agitator selection supported by CFD fluid dynamics simulation.
Strong R&D capability
We have strong research and development capacity and currently hold more than 40 national patents covering equipment tooling, products, and manufacturing processes.