GB/T 585 Marine Cast Steel Stop Check Valve | Dual Function Control
Combines a stop valve and a check valve in one unit. Screw down the stem to shut off flow completely. Raise the stem to allow automatic check valve function. Heavy-duty steel body for high temps.
Accreditation and Certificates:
The GB/T 585 gives you total control. It is a Screw Down Non-Return (SDNR) valve. The stem is not fixed to the disc. When you screw the stem down, it forces the disc shut like a normal globe valve. This isolates the line. When you open the stem, the disc is free. It lifts with flow and closes on backflow like a check valve. This reduces the number of valves needed in your piping.
Product Drawings：
Technical Specifications：
|
Model |
Nominal Pressure (PN) MPa | Nominal Diameter (DN) mm | Applicable Media |
| A, B | 1 | 65–150 | Fresh water, seawater, fuel oil, lubricating oil, and steam with temperature not exceeding 300 °C |
| 1.6 | 125–150 | ||
| 2.5 | 20–150 | ||
| 4 | 65–100 | Fresh water, seawater, fuel oil, lubricating oil, and steam with temperature not exceeding 400 °C | |
| 6.4 | 20–50 | ||
| AS, BS | 1 | 200–300 | Fresh water, seawater, fuel oil, lubricating oil, and steam with temperature not exceeding 300 °C |
| 1.6 | 65–250 | ||
| 2.5 | 20–150 | ||
| 4 | 65–100 | Fresh water, seawater, fuel oil, lubricating oil, and steam with temperature not exceeding 400 °C | |
| 6.4 | 20–50 |
Key Features：
- Dual Function: Acts as stop valve and check valve.
- Space Saving: Replaces two separate valves.
- High Temp: Steel body handles 400°C steam.
- Manual Override: Force close capability for safety.
Applications：
- Boiler Mains: Steam output control.
- Fuel Supply: Shutoff and backflow prevention.
- Feed Water: Pump discharge isolation.
Installation & Maintenance：
Installation: Vertical stem orientation is preferred. Verify flow direction.
Maintenance: Lubricate stem threads. Check packing gland tightness.
Custom Options Available：
We provide customization services based on international standards such as ANSI, JIS, and DIN, ensuring compatibility with different global market requirements.
FAQ ：
Q1: Can I lock this valve open?
A1: No. The stem only forces it closed or allows it to open. It cannot pull the disc open against backflow.
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