B148 C95800(2507) Marine Grade Dual Disc Check Valve

Description

Technical Data Sheet

Wafer Dual Plate Check Valve
(C95800 Body, Viton Seals, Monel K500 Shaft)

1. General Description

Product Type: Wafer Type, Dual Plate Check Valve (Non-Slam / Silent Type)
Design: Spring-assisted closure for rapid response and prevention of water hammer
End Connections: Wafer style for sandwich mounting between two pipe flanges (PN10/PN16/Class 150)
Installation: Suitable for horizontal or vertical pipelines (flow direction upward)
Design Standard: API 594 / BS 5153 / EN 16767 / DIN 3202 K3
Face-to-Face: EN 558 Series 52 / DIN 3202 K3 / API 594 Table 1
Flange Drilling: EN 1092-2 PN10/PN16, ASME B16.5 Class 150
Test Standard: EN 12266-1 / API 598

2. Application

Suitable Media: Seawater, brines, aggressive chemicals, sour gas, hydrocarbons, acids, and alkalis where high corrosion resistance is required.
Typical Industries: Offshore platforms, shipbuilding, marine engineering, chemical processing, desalination plants, oil & gas, and power generation.
Temperature Range: -20°C to +200°C (depending on Viton grade – FKM/FPM).

3. Technical Parameters (Reference Values)

Parameter	Specification
Nominal Diameter (DN)	DN50 – DN600 (Larger sizes available upon request)
Pressure Rating	PN10 / PN16 / Class 150LB
Shell Test Pressure	1.5 x PN (e.g., 24 bar for PN16)
Seat Test Pressure	1.1 x PN (e.g., 17.6 bar for PN16)
Leakage Rate	Zero Leakage (Bubble Tight) – ISO 5208 Rate A / ANSI Class VI
Operating Temperature	-20°C to +200°C (Viton FKM)
Flow Direction	Uni-directional (arrow marked on body)
Spring Type	Torsion springs (corrosion-resistant alloy)
Mounting Position	Horizontal or Vertical (flow upward)

4. Materials of Construction

Component	Specified Material	Material Properties & Notes
Body	C95800 Nickel Aluminum Bronze	ASTM B148 C95800 . High-strength copper alloy with excellent resistance to seawater corrosion, cavitation, and impingement. Composition: Cu bal., Al 8.5-9.5%, Ni 4-5%, Fe 3.5-4.5% . Tensile Strength: min. 585 MPa .
Discs (2 Plates)	C95800 Nickel Aluminum Bronze	Same material as body – galvanic compatibility. Provides lightweight, rapid closing action with high strength .
Seat / O-Rings	Viton (FKM) – Fluoroelastomer	Exceptional resistance to high temperatures, oils, fuels, acids, and aggressive chemicals . Maintains elasticity at high temperatures. Hardness: 70-90 Shore A (typical).
Shaft / Hinge Pin	Monel K500 (UNS N05500)	Precipitation-hardened nickel-copper alloy . Combines the corrosion resistance of Monel 400 with higher strength and hardness. Excellent for seawater and sour service (NACE MR0175 compliant) . Yield Strength: up to 760 MPa (aged) .
Springs	Inconel 625 / Hastelloy C276 (or as specified)	High-performance alloy to withstand corrosive media and high temperatures. Provides positive disc closure.
Bushings	PTFE / Reinforced PTFE / Carbon-filled PTFE	Low friction, prevents galling on the shaft, suitable for high temperatures.
Internal Fasteners	Monel / Stainless Steel 316	To match the corrosion resistance of the assembly.

5. Key Features & Benefits

Feature	Benefit
C95800 Nickel Aluminum Bronze Construction	Superior resistance to seawater corrosion, erosion, and cavitation. Ideal for marine and offshore environments. High strength-to-weight ratio .
Monel K500 Shaft	Exceptional strength and hardness combined with outstanding corrosion resistance in seawater and reducing acids. Resists galling and wear .
Viton (FKM) Seat/Seals	Excellent chemical compatibility over a wide temperature range (-20°C to +200°C). Resists swelling and degradation from hydrocarbons and aggressive fluids .
Dual Plate Design	Lightweight, compact wafer body. Reduced pressure drop compared to swing check valves. Non-slam operation due to short disc travel and spring assistance.
Spring-Assisted Closure	Minimizes water hammer and reverse flow velocity. Springs are fully isolated from the media.
Replaceable Seat	For ease of maintenance (design dependent).

6. Dimensions & Weights (Reference Values – PN10/PN16)

*Note: Based on EN 558 Series 52 (DIN 3202 K3) and EN 1092-2 flange standards. Dimensions are for reference only. Request certified drawing from manufacturer for exact dimensions. *

DN (mm)	L (Face-to-Face) mm	D (Flange Dia.) mm – PN16	Bolt Circle (PCD) mm – PN16	No. Bolts – Ø	Weight (approx.) kg
50	43	165	125	4 – 19	2.5
65	46	185	145	4 – 19	3.2
80	64	200	160	8 – 19	4.5
100	64	220	180	8 – 19	6.0
125	70	250	210	8 – 19	8.5
150	76	285	240	8 – 23	11.0
200	89	340	295	12 – 23	18.0
250	114	405	355	12 – 28	28.0
300	114	460	410	12 – 28	40.0
350	127	520	470	16 – 28	58.0
400	140	580	525	16 – 31	82.0
450	152	640	585	20 – 28	115.0
500	152	715	650	20 – 31	130.0
600	178	840	770	20 – 34	190.0

(Note: For PN10 flanges, dimensions are similar for smaller sizes; for larger sizes > DN250, bolt circles may differ. Confirm with manufacturer.)

7. Material Properties (Detailed)

C95800 Nickel Aluminum Bronze

Density: 7.64 g/cm³
Tensile Strength (min): 585 MPa
Yield Strength (min): 240 MPa
Elongation (min): 15%
Hardness: 159 – 200 HB
Corrosion Resistance: Excellent in seawater, brine, dilute acids. Resistant to cavitation and impingement attack.

Monel K500 (UNS N05500)

Type: Age-hardenable nickel-copper alloy
Tensile Strength (aged): 950 – 1200 MPa
Yield Strength (aged): 690 – 900 MPa
Corrosion Resistance: Similar to Monel 400 – excellent in seawater, sour gas (NACE compliant), and reducing chemical environments.
Temperature Range: -100°C to +260°C

Viton (FKM)

Type: Fluoroelastomer
Temperature Range: -20°C to +200°C
Chemical Resistance: Excellent against hydrocarbons, oils, fuels, mineral acids, salt solutions, and aliphatic solvents.
Limitations: Not recommended for ketones, esters, ethers, or hot amines.

8. Testing & Inspection

Test	Test Pressure (PN16)	Acceptance Criteria
Shell Hydrostatic Test	24 bar (1.5 x PN)	No visible leakage, no structural damage
Seat Leakage Test	17.6 bar (1.1 x PN)	Zero Leakage (Rate A – Bubble Tight)
Low-Pressure Air Test	0.6 bar (optional)	Bubble-tight sealing
Material Certification	–	EN 10204 Type 3.1 or 3.2 (if required)

9. Selection Notes

Material Compatibility: This valve combines three premium materials:
- C95800 Body/Discs: Provides the base structure with exceptional seawater corrosion resistance .
- Monel K500 Shaft: Offers high strength and hardness while matching the corrosion resistance of the body .
- Viton Seals: Ensures compatibility with a wide range of chemicals and high temperatures .
- This combination is ideal for the most demanding marine, offshore, and chemical applications.
Flow Direction: Dual plate check valves are uni-directional. Ensure the valve is installed with the flow arrow matching the pipeline direction.
Installation Position: Suitable for horizontal or vertical lines (flow upward). For vertical lines with downward flow, a spring-assisted or gravity-closing type is required (consult manufacturer).
Water Hammer: The spring-assisted closure minimizes slamming and water hammer, but system design should still be verified for rapid flow reversals.
Gaskets: No additional gaskets are required between flanges, as the valve body acts as its own gasket. Ensure flange faces are clean and parallel.
Bolt Length: Use longer studs or bolts to pass through both flanges and the valve body.

10. Ordering Information

To ensure correct selection, please specify:

Valve Type: Wafer Dual Plate Check Valve
Size (DN):
Pressure Rating: PN10 / PN16 / Class 150
Body Material: C95800 Nickel Aluminum Bronze
Disc Material: C95800
Shaft Material: Monel K500
Seat / Seal Material: Viton (FKM)
Spring Material: (e.g., Inconel 625)
Operation: Automatic (spring-assisted)
Flange Standard: EN 1092-2 / ASME B16.5
Installation Position: Horizontal / Vertical
Certification Requirements: (e.g., Material Certificates 3.1)

This data sheet is a guideline based on standard industry practice for Wafer Dual Plate Check Valves constructed from premium materials (C95800, Monel K500, Viton). Always refer to the manufacturer’s certified drawings for exact dimensions and ratings .