Flanged Bronze Gate Valve | C95800 Gear‑Operated Class150 Marine Valve

Bronze Gate Valve adopts solid wedge disc structure for reliable shut‑off performance.
Body material: high‑quality bronze
Connection: threaded NPT / BSPP, flanged end optional
Pressure rating: PN10‑PN16 / Class125‑150
Excellent corrosion resistance, suitable for seawater environment
Tight shut‑off, low flow resistance
Compact and durable structure, long service life
Easy operation and maintenance
OEM custom sizes and thread standards supported

Description
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Technical Data Sheet

Flanged Bronze Gate Valve

Bolted Bonnet Gate Valve – OS&Y, Rising Stem
Body Material: C95800 (Nickel Aluminium Bronze)

Product: Bolted Bonnet Gate Valve
Valve Type: Gate Valve – Flexible Wedge / Solid Wedge
Model: Z41H Series (Flanged End, Rising Stem)
Body Material: C95800 / ASTM B148 C95800 / BS EN 1982 CC333G (Nickel Aluminium Bronze)
Design Features: OS&Y (Outside Screw & Yoke) , BB (Bolted Bonnet) , RS (Rising Stem)
Standard: API 600 / ASME B16.34 / BS EN 1982

1. Product Description

A Bolted Bonnet Gate Valve with OS&Y (Outside Screw and Yoke) and Rising Stem (RS) design is a multi-turn isolation valve used for fully opening or closing pipelines. The bolted bonnet construction provides robust, maintenance-friendly sealing for high-pressure and high-temperature applications . The OS&Y design positions the stem threads outside the valve body, preventing corrosion and wear from process media while providing clear visual indication of valve position .

The C95800 Nickel Aluminium Bronze body offers exceptional corrosion resistance, particularly in seawater, marine environments, and chemical applications, with excellent resistance to cavitation and biofouling .

2. Design & Inspection Standards

Item	Standard / Code	Remarks
Design & Manufacturing	API 600 / ASME B16.34	Steel gate valves – bolted bonnet design
Face-to-Face Dimension	ASME B16.10	For flanged ends
Flange Dimensions	ASME B16.5 (Class 150-600) / ASME B16.47 (larger sizes)	RF (Raised Face) or FF (Flat Face)
Pressure-Temperature Rating	ASME B16.34	Rating tables per material class
Inspection & Testing	API 598 / BS EN 12266-1	Shell and seat tests
Material Standard (Body)	ASTM B148 C95800 / BS EN 1982 CC333G	Nickel Aluminium Bronze
NACE Compliance	NACE MR0175 / ISO 15156	Optional for sour service

3. C95800 Material Properties

C95800 (Nickel Aluminium Bronze) is a copper-aluminum-iron-nickel alloy with exceptional mechanical and corrosion-resistant properties .

Property	Value	Remarks
Tensile Strength	590 MPa (min)	High strength for pressure applications
Yield Strength (0.2% offset)	250 MPa (min)
Elongation	18% (min)	Good ductility
Hardness (Brinell)	159 HB (min)
Density	7.64 g/cm³
Melting Range	1043-1063°C
Max Service Temperature	-29°C to +425°C	Mechanical properties
Key Characteristics	Excellent seawater corrosion resistance; high strength; good wear resistance; resistant to cavitation and biofouling; non-sparking; excellent in marine and chemical environments
Chemical Composition	Cu: 79-83%, Al: 8.5-9.5%, Fe: 3-4.5%, Ni: 4-5%, Mn: 0.8-1.5%

4. Technical Parameters

Item	Technical Parameter	Remarks
Valve Type	Gate Valve – Flexible Wedge or Solid Wedge	Flexible wedge for thermal cycling; solid wedge for general service
Size Range	DN50 (2″) ~ DN600 (24″)	Larger sizes up to 64″ available upon request
Pressure Class	Class 150 LB / Class 300 LB / PN10/PN16/PN25/PN40	Most common: Class 150 and Class 300
Connection Type	Flanged Ends	ASME B16.5 RF (Raised Face) or FF (Flat Face)
Operation	Handwheel (Standard) / Gear Operator (for larger sizes)	Rising stem provides visual position indication
Bonnet Type	Bolted Bonnet (BB)	Robust construction for easy maintenance
Stem Design	OS&Y (Outside Screw & Yoke) with Rising Stem (RS)	Stem threads outside body; prevents corrosion and wear
Temperature Range	-29°C ~ +425°C	C95800 material limit
Applicable Media	Seawater, Brine, Brackish Water, Oil, Gas, Steam, Chemical Solutions	Excellent for marine and corrosive environments
Flow Direction	Bidirectional	Gate valves provide isolation in both directions
Shell Test Pressure	1.5 x Rated Pressure (Class 150: 425 psi / Class 300: 1125 psi)	Per API 598
High-Pressure Seat Test	1.1 x Rated Pressure (Class 150: 310 psi / Class 300: 825 psi)	Per API 598
Leakage Class	API 598 Rate A (Zero visible leakage) / Class IV	For metal-to-metal seats

5. Material Specifications

Part Name	Material Grade	Standard / Remarks
Body	C95800 (Nickel Aluminium Bronze)	ASTM B148 C95800 / BS EN 1982 CC333G
Bonnet	C95800 (Nickel Aluminium Bronze)	ASTM B148 C95800; bolted bonnet design
Gate (Wedge)	C95800 (Nickel Aluminium Bronze)	Flexible wedge or solid wedge design
Seat Rings	C95800 (Integral) or C95800 + STL(Stellite Hardface)	Integral or renewable; optional hardfacing for extended wear
Stem	C63000 (Ni-Al Bronze) or Monel K500	ASTM B124/B283 C63000 for compatibility; Monel K500 for enhanced corrosion resistance
Stem Nut / Thrust Washer	C93200 (Bearing Bronze)	ASTM B505; low friction, corrosion-resistant
Gland / Packing	Flexible Graphite / PTFE	Low emission design optional
Gasket (Body-Bonnet)	Spiral Wound (316+Graphite) / PTFE	For bolted bonnet sealing
Studs & Nuts (Bonnet)	A193 B7 / A194 2H (Carbon Steel) or A193 B8 / A194 8 (SS)	For bolted bonnet connection
Yoke	C95800 / Ductile Iron (65-45-12)	Integrated or separate yoke design
Handwheel	Cast Iron (EN-GJL-200) / Fabricated Steel

6. Key Design Features

OS&Y (Outside Screw & Yoke) Design:

Stem threads are positioned outside the valve body and bonnet
Threads are not exposed to process media, preventing corrosion and wear
Provides clear visual indication of valve position (open/closed) based on stem rise
Allows for easy lubrication and maintenance of stem threads

BB (Bolted Bonnet) Construction:

Bonnet is secured to body with heavy-duty studs and nuts
Provides robust, pressure-tight sealing for high-pressure applications
Allows for easy disassembly for maintenance, inspection, and seat replacement
Suitable for wider temperature and pressure ranges compared to threaded bonnet

RS (Rising Stem) Operation:

Stem rises when valve opens, lowers when valve closes
Immediate visual confirmation of valve status
Position indicators not required (stem itself shows position)

Flexible Wedge Design:

Compensates for thermal expansion and contraction
Ensures tight sealing across varying temperatures
Reduces operating torque and prevents wedge jamming

C95800 Construction:

Full nickel-aluminium bronze construction for superior corrosion resistance
Ideal for seawater, marine, and offshore environments
Excellent cavitation erosion resistance
Non-sparking for hazardous environments

Backseat Design:

Screwed-in backseat allows for packing replacement under pressure (when valve fully open)

Low Emission Design (Optional):

Available with live-loaded packing for fugitive emission control

7. Dimensional Data (Class 150 / Class 300)

Reference dimensions based on ASME B16.10 and API 600. Dimensions may vary by manufacturer.

Class 150 Dimensions (ASME B16.5 RF Flanges)

Size (NPS)	Size (DN)	L (Face-to-Face) mm	D (Flange O.D.) mm	Bolt Circle (C) mm	No. of Holes	Hole Dia (mm)	Approx H (Open) mm
2″	50	178	150	120.7	4	19	380
3″	80	203	190	152.4	4	19	470
4″	100	229	230	190.5	8	19	570
6″	150	267	280	241.3	8	23	760
8″	200	292	345	298.5	8	23	950
10″	250	330	405	362.0	12	25	1150
12″	300	356	485	431.8	12	25	1350
14″	350	381	535	476.3	12	29	1500
16″	400	406	595	539.8	16	29	1700
18″	450	432	635	577.9	16	32	1900
20″	500	457	700	635.0	20	32	2100
24″	600	508	815	749.3	20	35	2500

Class 300 Dimensions (ASME B16.5 RF Flanges)

Size (NPS)	Size (DN)	L (Face-to-Face) mm	D (Flange O.D.) mm	Bolt Circle (C) mm	No. of Holes	Hole Dia (mm)	Approx H (Open) mm
2″	50	216	165	127.0	8	19	420
3″	80	282	210	168.3	8	23	520
4″	100	305	255	200.0	8	23	620
6″	150	403	320	269.9	12	23	820
8″	200	419	380	330.2	12	25	1020
10″	250	457	445	387.4	16	29	1250
12″	300	502	520	450.9	16	32	1450

Note: Dimensions are typical and may vary by manufacturer. Certified drawings should be requested for final installation planning.

8. Applications

Marine & Shipbuilding: Seawater cooling systems, ballast systems, fire protection systems, bilge systems. C95800 is the industry standard for seawater service .
Offshore Platforms: Seawater injection systems, firewater systems, utilities on offshore installations .
Desalination Plants: High-salt brine and seawater handling in reverse osmosis and multi-stage flash desalination .
Coastal Power Plants: Seawater cooling circuits and pump discharge lines.
Chemical Processing: Handling corrosive chemicals and aggressive fluids where C95800 provides superior corrosion resistance .
Petrochemical Refineries: Suitable for applications requiring resistance to sour service (with NACE compliance) .
Shipbuilding: Ballast systems, cooling water, fire mains, approved by classification societies (BV, DNV, Lloyd’s) .

9. Industry Terminology (FAQ)

Term	Definition
OS&Y (Outside Screw & Yoke)	Stem threads are positioned outside the valve body and bonnet, preventing corrosion from process media. Provides visual indication of valve position .
BB (Bolted Bonnet)	Bonnet is secured to body with heavy-duty studs and nuts, allowing for easy maintenance and robust pressure sealing .
RS (Rising Stem)	Stem rises when valve opens and lowers when valve closes, providing immediate visual confirmation of valve status .
Flexible Wedge	Wedge design that compensates for thermal expansion and ensures tight sealing across varying temperatures .

Important Notes:

C95800 is equivalent to BS EN 1982 CC333G, ASTM B148 C95800, and ISO CuAl10Fe5Ni5 .
Temperature Range: The valve is rated for -29°C to +425°C based on C95800 material properties . For applications above 200°C, consult manufacturer for seat and gasket material compatibility.
Stem Material Options:
- C63000 (Ni-Al Bronze) : Standard option, compatible with C95800 body
- Monel K500: Enhanced corrosion resistance for severe marine and sour service
Seat Options:
- Integral Metal Seat: Standard for full C95800 construction
- Stellite Hardfacing: Optional for extended wear life in demanding applications
Optional Features available:
- Gear operator for sizes above DN200 (8″) and high-pressure classes
- Motor/electric actuator for automation
- Position indicators and limit switches
- Low-emission packing (ISO 15848)
- NACE MR0175 compliance for sour service
- Third-party inspection and certification (TÜV, DNV, Lloyd’s, SGS)
Service Life: With C95800 material and API/ISO testing, typical service life exceeds 25 years in marine and desalination applications .
Certified dimensional drawings should be requested for final installation planning.