Product Specification
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| Payment Terms |
T/T, Western Union, L/C |
Supply Ability |
1000000/per month |
| Delivery Time |
within 7 working days |
Packaging Details |
carton |
| Brand Name |
BJSTC |
Model Number |
Dn400 |
| Certification |
CE ISO9001 |
Place of Origin |
China |
The DN400 Non-Bleed Gear-Operated Valve is a large-diameter fluid control component designed for scenarios requiring reliable on/off regulation of media (such as water, gas, or industrial fluids) without the need for pressure relief ports. Its design integrates a gear-driven operating mechanism and a non-bleed structure, making it suitable for medium-to-high pressure pipeline systems where frequent maintenance-related pressure release is unnecessary. Below is a detailed breakdown of its key features, working principle, performance characteristics, and typical applications:
- Nominal Diameter (DN400): Conforming to international pipeline standards, DN400 indicates a nominal diameter of 400mm. This large size is tailored for high-flow pipeline systems (e.g., municipal water supply mains, industrial process pipelines), ensuring minimal flow resistance when fully open. The actual outer/inner diameter may vary slightly based on material (e.g., steel, PE, or ductile iron) but aligns with industry compatibility requirements for DN400 pipelines.
- Non-Bleed Structure: Unlike valves with dedicated bleed ports (for releasing residual pressure/medium during maintenance), this valve omits bleed channels. Its sealed design focuses on tight media shut-off rather than pressure relief, simplifying the structure while reducing potential leakage points—ideal for systems where maintenance can be scheduled with pre-planned pipeline depressurization (e.g., via upstream/downstream isolation valves).
The valve adopts a gear transmission system to drive the valve core (e.g., ball, gate, or plug, depending on the specific valve type):
- Torque Reduction: For DN400 large-diameter valves, direct manual operation requires significant force due to high media pressure and sealing friction. The gear mechanism (typically a worm gear or spur gear) amplifies torque input, reducing the physical effort needed to open/close the valve—even for manual operation, a standard handwheel can easily drive the valve core rotation.
- Precise Control: The gear system slows down the valve core’s movement speed, preventing sudden opening/closing (which could cause water hammer or pressure surges in pipelines). This ensures stable media flow adjustment and protects the pipeline system from impact damage.
- Durable Drive Components: Gear parts are usually made of high-strength materials (e.g., ductile iron, stainless steel) with anti-wear coatings, ensuring long-term smooth operation even in harsh environments (e.g., buried or outdoor installations).
Taking a common DN400 Non-Bleed Gear-Operated Ball Valve as an example:
- Operation Initiation: When the operator rotates the handwheel (or connects an electric actuator to the gear system), the rotational force is transmitted to the gear set.
- Torque Amplification: The gear system converts the low-torque, high-speed rotation of the handwheel into high-torque, low-speed rotation, which drives the valve stem.
- Valve Core Movement: The valve stem rotates the spherical valve core (valve ball) inside the 阀体 (valve body). A 90-degree rotation of the valve ball switches the valve between "fully open" and "fully closed" states:
- Fully Open: The flow channel inside the valve ball aligns with the inlet/outlet of the valve body, allowing media to flow through unobstructed.
- Fully Closed: The solid surface of the valve ball presses tightly against the sealing seats (e.g., PTFE or rubber seals), forming a bubble-tight seal to block media flow.
- Non-Bleed Advantage: Since no bleed ports are present, the valve maintains a closed, sealed system during operation—eliminating risks of accidental media leakage from bleed valves and reducing maintenance needs for bleed-related components.
DN400 valves are often used in medium-to-high pressure pipelines. Depending on the material (e.g., carbon steel for industrial use, PE100 for municipal gas), their nominal pressure (PN) typically ranges from PN10 to PN40 (1.0MPa to 4.0MPa), meeting the pressure requirements of municipal water supply (usually PN10-PN16) and industrial process pipelines.
The non-bleed design reduces potential leakage points, while high-precision machining of the valve core (e.g., a polished stainless steel ball) and high-performance sealing seats ensure tight shut-off. For gas or toxic fluid applications, it can achieve "zero leakage" (conforming to standards like API 6D or ISO 5208), preventing environmental pollution and safety hazards.
- Valve Body: Common materials include ductile iron (for buried water pipelines), carbon steel (for industrial oil/gas), or PE100 (for municipal gas), all of which offer corrosion resistance and impact resistance.
- Internal Components: Gear sets and valve stems are treated with anti-corrosion (e.g., galvanization, epoxy coating) and anti-wear processes, ensuring a service life of 10–20 years (or up to 50 years for PE versions) under normal operating conditions.
The valve’s connection ends are designed to match standard DN400 pipeline interfaces (e.g., flange connection for steel valves, electrofusion/hot fusion for PE valves), ensuring seamless compatibility with existing pipeline systems. For buried applications, it can be paired with anti-corrosion coatings or protective casings (if needed) to adapt to soil conditions.
- Municipal Water Supply & Drainage: Used in large-diameter water mains, reservoir inlet/outlet pipelines, or sewage treatment plant process pipelines—where high flow rates and reliable shut-off are required, and maintenance can be coordinated with system depressurization.
- Industrial Process Pipelines: Suitable for chemical, petrochemical, or power plant pipelines transporting non-corrosive/moderately corrosive fluids (e.g., cooling water, process oil)—the gear mechanism simplifies operation of large-diameter valves, while the non-bleed design avoids media contamination from bleed ports.
- Municipal Gas Transmission (PE Version): DN400 Non-Bleed Gear-Operated PE Valves (made of PE100) are used in medium-pressure gas transmission pipelines. Their corrosion resistance and non-bleed structure make them ideal for buried installations, where leakage risks must be minimized.
In summary, the DN400 Non-Bleed Gear-Operated Valve combines large-flow capacity, labor-saving gear operation, and reliable sealing—making it a practical choice for large-diameter pipeline systems that prioritize operational efficiency, safety, and low maintenance.
Company Details
Bronze Gleitlager
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Bronze Sleeve Bushings
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Graphite Plugged Bushings
from Quality China Factory
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Business Type:
Manufacturer,Distributor/Wholesaler,Agent,Exporter,Trading Company,Seller
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Total Annual:
100000-500000
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Ecer Certification：
Site Member
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