Angle SDNR Valve
Angle SDNR Valve (Angle Screw Down Non Return Valve) is a combined shut-off and check valve designed for controlling and preventing reverse flow in piping systems.
The valve integrates the functions of a globe valve and a non-return valve, allowing operators to manually isolate the pipeline while automatically preventing backflow.
The angle pattern design changes the flow direction by 90 degrees, providing:
Compact installation
Reduced piping space
Lower flow resistance
Improved pipeline arrangement
Reliable flow control performance
Angle SDNR Valve is widely used in:
Marine piping systems
Shipbuilding projects
Seawater cooling systems
Ballast systems
Bilge systems
Fire protection systems
Fuel oil systems
Industrial fluid systems
Overview
Working Principle of Angle SDNR Valve
Angle SDNR Valve operates through a screw-down mechanism combined with an automatic non-return function.
The valve controls fluid flow through vertical movement of the disc.
Operating Process:
The handwheel rotates the valve stem.
The stem moves the disc upward or downward.
When the valve opens, fluid flows through the angled passage.
When the valve closes, the disc presses against the seat to stop flow.
When reverse pressure occurs, the disc automatically closes to prevent backflow.
Main Components of Angle SDNR Valve
| Component | Function |
|---|---|
| Valve Body | Provides pressure resistance and angled flow passage |
| Bonnet | Protects internal components and provides sealing |
| Disc | Controls opening, closing, and check function |
| Valve Seat | Provides sealing surface |
| Stem | Transfers operating force to the disc |
| Handwheel | Provides manual operation |
| Yoke | Supports operating mechanism |
| Packing | Prevents leakage around stem |
| Gasket | Ensures bonnet sealing |
| Bolts & Nuts | Secure valve assembly |
Applicable Standards of Angle SDNR Valve
| Standard Category | Applicable Standards |
|---|---|
| Marine Valve Standards | JIS F Series, DIN Marine Valve Standards, CB/T Marine Standards |
| Valve Design Standards | API, ASME, EN 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 150/300 |
| Material Standards | ASTM, EN, JIS, GB Material Standards |
| Pressure Testing | API 598, ISO 5208, EN 12266 |
| Classification Requirements | ABS, DNV, LR, BV, CCS, ClassNK |
Material Selection of Angle SDNR Valve
| Material | Features | Applications |
|---|---|---|
| Cast Iron | Economical, good mechanical strength | General water systems |
| Ductile Iron | Higher strength and impact resistance | Medium pressure systems |
| Bronze | Excellent seawater corrosion resistance | Marine seawater applications |
| Brass | Good corrosion resistance and machinability | Auxiliary systems |
| Cast Steel | High strength and pressure resistance | High pressure applications |
| Stainless Steel | Excellent corrosion resistance | Offshore and corrosive environments |
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 |
Technical Specifications of Angle SDNR Valve
| Item | Specification |
|---|---|
| Product Name | Angle Screw Down Non Return Valve |
| Type | Angle Pattern SDNR Valve |
| Function | Shut-off & Non-Return |
| Medium | Seawater, Fresh Water, Oil, Air, Steam |
| Size Range | DN15-DN500 / NPS 1/2"-24" |
| Pressure Rating | JIS 5K/10K/16K, PN6-PN25, ANSI Class 150-600 |
| Connection Type | Flanged |
| Operation | Manual Handwheel |
| Body Material | Cast Iron / Bronze / Steel / Stainless Steel |
| Installation | Horizontal Pipeline Installation |
| Application | Marine & Industrial Piping Systems |
Pressure Test of Angle SDNR Valve
| Test Item | Description |
|---|---|
| Shell Hydrostatic Test | Verifies valve body strength |
| Seat Leakage Test | Confirms sealing performance |
| Non-Return Function Test | Checks automatic closing capability |
| Pressure Holding Test | Ensures pressure stability |
| Material Inspection | Confirms material requirements |
| Final Inspection | Ensures product quality before shipment |
Advantages of Angle SDNR Valve
| Feature | Benefit |
|---|---|
| Combined Valve Design | Provides shut-off and check functions in one valve |
| Angle Structure | Saves installation space |
| Reliable Sealing | Reduces leakage risk |
| Multiple Material Options | Suitable for different media |
| International Standards Available | Meets global project requirements |
Typical Applications
| Application | Function |
|---|---|
| Marine Cooling System | Controls cooling water flow |
| Ballast System | Prevents reverse water flow |
| Bilge System | Controls drainage |
| Fire Protection System | Provides emergency isolation |
| Fuel System | Controls fuel pipeline flow |
| Industrial Pipeline | Controls liquid and gas flow |
