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Help CenterMarine Diaphragm Type Air Reducing Valve YQK-12 For Cargo Ship Fishing Vessel Air System
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Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present the Marine Diaphragm Type Air Reducing Valve YQK-12, a precision-engineered component designed specifically for the demanding air systems of cargo ships and fishing vessels. With over 8 years of manufacturing expertise and an annual export value exceeding US$1 million, our valve delivers reliable pressure regulation, corrosion resistance, and long service life in harsh marine environments. This product is the ideal choice for shipbuilders, vessel operators, and marine maintenance teams seeking a robust, cost-effective solution for compressed air distribution.
The YQK-12 features a diaphragm-type pilot operation that ensures smooth and accurate pressure reduction, minimizing pressure fluctuations that could damage downstream equipment. Its compact design allows easy installation in tight engine rooms or control panels, while the high-quality materials (bronze body and stainless steel trim) provide excellent resistance to saltwater corrosion and oxidation. Whether you are retrofitting an existing vessel or building a new one, this valve meets the strict requirements of marine classification societies and is backed by ISO9001 quality management system.
Key Features & Technical Specifications
- Diaphragm Actuated Design: Provides precise pressure control with minimal hysteresis, ensuring stable outlet pressure even under varying inlet conditions.
- Corrosion-Resistant Materials: Body available in bronze or stainless steel, with stainless steel diaphragm and internal parts – suitable for bilge, ballast, and fire extinguishing air systems.
- Adjustable Outlet Pressure: Factory set at 0.5 MPa, but easily adjustable from 0.1 to 1.0 MPa via a lockable adjustment screw.
- High Flow Capacity: Large diaphragm area and optimized internal passages reduce pressure drop and support high flow rates for multiple pneumatic tools or controls.
- Low Maintenance: Self-cleaning filter screen and replaceable diaphragm cartridge extend service intervals and reduce downtime.
- Versatile Mounting: Can be installed in any orientation – horizontal or vertical – with threaded or flanged connections per customer request.
- Temperature Range: -20°C to +80°C, covering most marine ambient conditions.
| Parameter | Value |
| Model | YQK-12 |
| Inlet Pressure Max | 3.0 MPa (435 psi) |
| Outlet Pressure Range | 0.1 – 1.0 MPa (14.5 – 145 psi) |
| Connection Size | 1/2" – 2" NPT / BSP / Flanged (customizable) |
| Body Material | Bronze (standard) / Stainless Steel (optional) |
| Diaphragm Material | NBR (standard) / EPDM (optional for high temperature) |
| Operating Temperature | -20°C to +80°C |
| Weight | Approx. 1.5 – 4.5 kg depending on size |
Detailed Product Advantages for Your Marine Application
The YQK-12 marine reducing valve is engineered to withstand the unique challenges of shipboard compressed air systems – from constant vibration and salt spray to fluctuating pressures. Here’s why it outperforms conventional valves:
- Superior Accuracy: The diaphragm-type pilot reduces pressure with a tolerance of ±5% of set point, ensuring consistent air supply for pneumatic controls, automation, and safety equipment.
- Longevity in Marine Environment: All external fasteners are stainless steel, and the body is treated with anti-corrosion coating. The valve is tested with 3.5% salt spray for 96 hours per ASTM B117.
- Easy Integration: Available with flanged connections (optional) for direct installation on ship pipelines. The valve body is compact (length approx. 150mm for 1/2" size) for space-saving mounting.
- Safety Features: Internal relief valve prevents over-pressurization downstream. The adjusting screw is lockable to prevent tampering.
- Cost-Effective Maintenance: The diaphragm and seat can be replaced without removing the valve from the pipeline – reducing labor and downtime.
Trusted by Shipowners Worldwide
Shanghai Zhibang Valve has supplied over 50,000 marine valves to customers in North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East since 2016. Our YQK-12 series is already installed on hundreds of cargo ships and fishing vessels, with a reported field failure rate of less than 0.3%. We operate a 100% pressure and leak test on every valve before shipment, and all products are manufactured under ISO9001 quality management system.
We offer flexible shipping from Shanghai, Guangzhou, Hong Kong, and Beijing ports, with typical lead time of 15-25 days for standard sizes. For OEM/ODM orders, we can customize connection types, pressure ranges, and materials to match your specific vessel requirements. Our technical team is available 24/7 for after-sales support.
Choose the YQK-12 – reduce your operating costs, improve system reliability, and sail with confidence. Contact us today for a quote or technical consultation.
Frequently Asked Questions
-
Q: What is the maximum inlet pressure for the YQK-12?
A: The maximum inlet pressure is 3.0 MPa (435 psi). It is recommended to install a pressure gauge upstream to monitor inlet conditions. -
Q: Can this valve be used for seawater or other fluids?
A: No, this valve is designed for compressed air and inert gases only. For seawater applications, please consult our team for a specialized material selection. -
Q: What is the outlet pressure adjustment range?
A: The outlet pressure can be adjusted from 0.1 to 1.0 MPa (14.5 to 145 psi) by turning the adjustment screw. A locknut is provided to secure the setting. -
Q: What connection types are available?
A: Standard connections are NPT or BSP threaded. Flanged connections (e.g., JIS, DIN, ANSI) are available as an option. Please specify your requirement when ordering. -
Q: Is the YQK-12 suitable for high-vibration environments like engine rooms?
A: Yes, the diaphragm design is resistant to vibration, and the valve body is robustly constructed. For extreme vibration, we recommend using flexible connectors on both sides. -
Q: What maintenance is required?
A: Periodically check the outlet pressure for drift and clean the internal filter screen. The diaphragm and seat kit should be replaced every 2-3 years, depending on air quality. Detailed instructions are included. -
Q: Do you provide samples for testing?
A: Yes, we offer sample orders with a lead time of 7-10 days. The sample cost is refundable for bulk orders of 50 pieces or more. -
Q: What certifications does your company hold?
A: Our company is ISO9001 certified. We can also provide material certificates and test reports per your request. For specific classification society approvals (e.g., CCS, DNV, ABS), please inquire.
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