Bellows Sealed Needle Valves
A bellows‑sealed needle valve is a high‑performance precision control valve widely used in various industrial pipeline systems, mainly manufactured with high‑quality stainless steel materials, featuring outstanding corrosion resistance and high‑temperature resistance. The core highlight of this valve is its built‑in professional bellows structure, which not only effectively prevents medium leakage and ensures zero external leakage, but also stably withstands extreme high pressure and high temperature working conditions, making it suitable for harsh industrial scenarios.
Selection Parameters
| Item | Parameter Details | Item | Parameter Details |
| Product Name | Bellows‑Sealed Needle Valve | Model | Yiluoke‑BN1 |
| Nominal Diameter | 1/8"~1‑1/2", special specifications can be customized | Drive Mode | Manual |
| Connection Type | Ferrule, Female Thread, Socket Weld, Male Thread, Butt Weld, other connectors are available | ||
| Nominal Pressure | 6000Psi | Max Pressure | ≤80000Psi |
| Applicable Temperature | -70℃~+580℃ | Max Temperature | ≤800℃ |
| Applicable Media | Gas, Liquid, etc. | Product Weight | 1KG~15KG |
| Valve Body Material | SS304, SS316, SS316L | Structure Type | Needle Type |
| Application Sites | Nuclear power stations, hydropower stations, thermal power stations, laboratory gas pipelines, heating systems, gas cylinder pipelines, chemical instruments and meters | ||
| Test Pressure | 1.5 times of maximum working pressure | Brand Name | Xiamen Yiluoke |
Material of Main Parts
| No. | Part Name | Material |
| 1 | Body | SS304, SS304L, SS316, SS316L |
| 2 | Bonnet Gasket | Red copper, PTFE |
| 3 | Bonnet | SS304, SS304L, SS316, SS316L |
| 4 | Packing Seat | PTFE, Expanded Graphite, Metal and Graphite, PPL |
| 5 | Packing | PTFE, Expanded Graphite, PPL |
| 6 | Packing Gland | SS304, SS304L, SS316, SS316L |
| 7 | Stem | SS304, SS304L, SS316, SS316L |
| 8 | Handle | SS304, SS304L, SS316, SS316L |
| 9 | Hexagon Screw | SS304, SS304L, SS316, SS316L |
Supplementary Note: Special materials such as Monel, Hastelloy, F22, WB36, F316L, F316H, F91, F92 and other alloys can be customized.
Characteristics of Bellows‑Sealed Needle Valve
Superior Sealing Performance: The sealing effect of the built‑in bellows is significantly better than traditional packing seals, which can completely block medium leakage, eliminate potential safety hazards, and guarantee the safe and stable operation of the entire pipeline system.
Excellent High‑Temperature Resistance: Imported stainless steel bellows‑sealed needle valves support long‑term stable operation in high‑temperature environments, with a maximum operating temperature up to 600℃, adapting to high‑temperature fluid transmission demands.
Strong Corrosion Resistance: The whole valve is made of professional stainless steel and alloy materials, with good corrosion resistance, suitable for conveying various corrosive media without damage or failure.
Compact & Lightweight Structure: Featuring a compact overall structure, small volume and light weight, it is easy to install and disassemble, occupies small installation space, and is suitable for narrow pipeline layouts.
High Precision Flow Control: The valve core adopts a professional needle‑shaped structure, enabling accurate control of medium flow rate and pressure, achieving ultra‑high adjustment precision to meet micro‑flow control requirements.
Application Fields of Bellows‑Sealed Needle Valve
Bellows‑sealed needle valves feature high temperature resistance, high pressure resistance, excellent sealing and precise control performance, and are widely used in multiple key industrial fields with strict working condition requirements:
• Petrochemical Industry: Used for controlling various high‑temperature and high‑pressure chemical media such as oil and natural gas in petrochemical production systems.
• Power Industry: Applied to high‑temperature and high‑pressure steam systems of thermal power plants, to accurately control the flow and pressure of steam.
• Chemical Industry: Suitable for high‑temperature and high‑pressure chemical reaction systems, for precise control of chemical substance flow.
• Heat Exchange Systems: Used in high‑temperature and high‑pressure heat exchange equipment, to control the flow direction and temperature of heat transfer media.
• Natural Gas Transmission: Deployed in natural gas long‑distance pipeline systems, for safe control of natural gas flow and pressure.
• High‑Temperature Liquid Handling: Applied to high‑temperature liquid conveying systems such as boiler water supply systems.
• Oil Exploitation: Used in oilfield exploitation projects, to control high‑temperature and high‑pressure oil and gas produced by oil wells.
• Fertilizer Production: Applied to urea production and other fertilizer processes, for transmission and control of high‑temperature and high‑pressure ammonia gas.
In general, bellows‑sealed needle valves play an irreplaceable critical role in industrial occasions requiring resistance to high‑temperature and high‑pressure environments and high‑precision fluid control, effectively ensuring the stable operation and operational safety of the entire system.
