Marine Angle SDNR Valve
Marine Angle SDNR Valve (Angle Screw Down Non Return Valve) is a combined shut-off and non-return valve specially designed for marine piping systems.
The valve integrates the functions of a globe valve and a check valve, allowing manual flow control while preventing reverse flow in pipelines. Its angle design provides efficient flow direction change and helps reduce pressure loss in shipboard piping systems.
Marine Angle SDNR Valve is widely used in:
Marine seawater systems
Cooling water systems
Fire fighting systems
Boiler feed water systems
Fuel oil systems
Bilge and ballast systems
Ship auxiliary piping systems
Overview
Working Principle of Marine Angle SDNR Valve
Marine Angle SDNR Valve combines shut-off and check valve functions in one valve body.
The valve operates through a screw-down mechanism:
The handwheel rotates the valve stem.
The disc moves vertically to open or close the flow passage.
When the valve is opened, fluid flows through the angled passage.
When reverse flow occurs, the disc automatically closes due to back pressure.
The valve prevents medium backflow and protects the piping system.
Main Components of Marine Angle SDNR Valve
| Component | Function |
|---|---|
| Valve Body | Provides pressure resistance and flow passage |
| Bonnet | Seals the upper valve chamber and allows maintenance |
| Disc | Controls opening and closing of the valve |
| Valve Seat | Provides sealing surface |
| Stem | Transfers operating force to the disc |
| Handwheel | Manual operation of valve |
| Yoke | Supports stem and operating mechanism |
| Packing | Prevents leakage around the stem |
| Gasket | Ensures body and bonnet sealing |
| Drain / Inspection Port | Facilitates maintenance and inspection |
Applicable Standards of Marine Angle SDNR Valve
| Standard Category | Applicable Standards |
|---|---|
| Marine Valve Standards | JIS F7400 Series, DIN 85003 Series, GB/T Marine Valve Standards |
| Valve Design Standards | ISO 5202, API Standards, EN Valve Standards |
| Flange Standards | JIS B2220, DIN EN 1092-1, ASME B16.5, GB/T 9112 |
| Pressure Rating | JIS 5K/10K/16K, PN6/PN10/PN16, ANSI Class 150 |
| Material Standards | ASTM, EN, JIS Material Standards |
| Pressure Testing | ISO 5208, API 598, EN 12266-1 |
| Marine Classification | ABS, DNV, LR, BV, CCS, ClassNK |
Technical Specifications of Marine Angle SDNR Valve
| Item | Specification |
|---|---|
| Product Name | Marine Angle Screw Down Non Return Valve |
| Type | Angle Pattern SDNR Valve |
| Function | Shut-off and Non-Return |
| Medium | Seawater, Fresh Water, Fuel Oil, Air, Steam |
| Size Range | According to Customer Requirements |
| Pressure Rating | JIS 5K/10K/16K, PN Series, Class Rating |
| Connection Type | Flanged |
| Operation | Manual Handwheel |
| Body Material | Cast Iron / Bronze / Steel / Stainless Steel |
| Installation | Marine Piping Systems |
| Applicable Industry | Shipbuilding, Offshore, Marine Engineering |
Pressure Test of Marine Angle SDNR Valve
| Test Item | Description |
|---|---|
| Shell Hydrostatic Test | Verify valve body strength and pressure resistance |
| Seat Leakage Test | Confirm shut-off sealing performance |
| Backflow Test | Verify non-return function |
| Pressure Holding Test | Ensure long-term pressure reliability |
| Material Inspection | Confirm material compliance |
| Final Inspection | Verify product quality before delivery |
Material Selection of Marine Angle SDNR Valve
| Material | Features | Applications |
|---|---|---|
| Cast Iron | Economical, good mechanical strength | General marine piping systems |
| Ductile Iron | Higher strength and impact resistance | Medium pressure marine systems |
| Cast Steel | High strength and pressure resistance | High pressure applications |
| Bronze | Excellent seawater corrosion resistance | Marine seawater systems |
| Stainless Steel | Excellent corrosion resistance | Offshore and corrosive environments |
| Brass | Good corrosion resistance and machinability | Auxiliary marine systems |
Common Material Standards
| Material | Standard |
|---|---|
| Cast Iron | ASTM A126 / EN-GJL |
| Ductile Iron | ASTM A536 / EN-GJS |
| Carbon Steel | ASTM A216 WCB |
| Stainless Steel | ASTM A351 CF8M |
| Bronze | ASTM B62 / JIS BC6 |
Advantages of Marine Angle SDNR Valve
| Feature | Benefit |
|---|---|
| Combined Shut-off and Check Function | Reduces installation space and components |
| Angle Design | Improves piping layout flexibility |
| Reliable Sealing | Prevents leakage and reverse flow |
| Marine Grade Materials | Suitable for seawater environments |
| Easy Maintenance | Simplifies inspection and repair |
