B148 C95800 Fully Lugged Concentric Butterfly Valves

Description

Product Technical Data Sheet

C95800 Fully Lugged Concentric Butterfly Valve

1. Product Overview

This product is a fully lugged, concentric (centerline) butterfly valve, with both body and disc manufactured from C95800 nickel aluminum bronze casting alloy. Conforming to ASTM B148, C95800 is a high-strength casting copper alloy with excellent resistance to seawater corrosion. It is widely used in marine engineering, seawater desalination, shipbuilding, and petrochemical applications.

Typical chemical composition of C95800 (mass fraction, %):

Element Content Range (%)
Copper (Cu) Remainder (min. 79.0)
Aluminum (Al) 8.5–9.5
Iron (Fe) 3.5–4.5
Nickel (Ni) 4.0–5.0
Manganese (Mn) 0.8–1.5
Silicon (Si) ≤0.10
Lead (Pb) ≤0.03
Tin (Sn) —
Phosphorus (P) —
Zinc (Zn) —
Nickel aluminum bronze provides superior corrosion resistance in seawater environments, especially resistance to cavitation and erosion-corrosion. It naturally forms a robust, dense, self-healing alumina (Al₂O₃) passive film, significantly extending valve service life in corrosive media.

2. Structural Description

Fully lugged body features through-threaded lug holes around the valve body, allowing direct bolting between pipeline flanges. Advantages include:

Facilitates pipeline maintenance – one pipeline side can be removed while the other side remains operational.
Suitable for dead-end service (end-of-line isolation).
Bidirectional sealing capability under full differential pressure.
Concentric (centerline) design means the stem centerline coincides with the disc centerline. This classic, most widely used butterfly valve configuration offers compact structure, low flow resistance, low operating torque, and easy maintenance.

3. Material List (Typical)

No. Component Standard Material Notes
1 Body C95800 Nickel Aluminum Bronze (UNS C95800) ASTM B148 / AB2
2 Disc C95800 Nickel Aluminum Bronze Polished surface
3 Stem Monel K400 / K500 / 17-4PH / SS316 Select based on service
4 Seat EPDM / NBR / VITON (FKM) / RPTFE / PTFE Replaceable
5 O-ring / Retainer VITON (FKM) / PTFE Stem sealing
6 Bearing / Bushing PTFE / Bronze-based PTFE Stem support
7 Thrust Washer PTFE / Bronze
8 Lug Fasteners SS304 / SS316 / Monel For lug type only
9 Operator Lever / Gearbox / Electric / Pneumatic Optional
*Note: Stem material can be selected based on service conditions. Monel K400/K500 offers superior corrosion resistance; 17-4PH and SS316 are suitable for general applications.*

4. Technical Parameters

Parameter Value / Specification
Nominal size (NPS/DN) 2″ – 48″ (DN50 – DN1200)
Pressure rating Class 150 / 300 LB, PN10 / PN16 / PN25
Body end connection ASME B16.5 Class 150 / 300, threaded lug type
Face-to-face dimension API 609 short pattern / ISO 5752 Series 20 / EN 558 Series 20
Design standards API 609, EN 593, MSS SP-67, ISO 5752
Test standards API 598, ISO 5208
Top flange standard ISO 5211 (direct actuator mounting)
Suitable media Seawater, brine, acids/alkalis, oil & gas, chemicals, fuel oil
Temperature range -20°C to +200°C (depending on seat material)
Max. working pressure 200 psi / 16 bar (derate for high temperature)
Leakage rate ISO 5208 Rate A (zero bubble leakage)
Flow direction Bidirectional (full pressure differential)
Seat type Resilient soft seat, replaceable or bonded
5. Design Standards

Design: API 609 (Cat A / Cat B), EN 593, MSS SP-67
Face-to-face: API 609, ISO 5752 Series 20, EN 558-1 Series 20
Flange connection: ASME B16.5 Class 150/300, ASME B16.42, EN 1092-2
Inspection & testing: API 598, ISO 5208, EN 12266
API 609 defines two categories:

Category A: Manufacturer’s rated Cold Working Pressure (CWP) – typical for concentric butterfly valves.
Category B: ASME Class pressure-temperature rating – typical for high-performance (eccentric) butterfly valves.
6. Dimensional Reference (API 609 Short Pattern / ISO 5752 Series 20)

ANSI Class 150 Fully Lugged Butterfly Valves

NPS DN (mm) L – Face-to-Face (mm) H – Open Height (mm) approx. Weight (kg) approx.
2″ 50 43 195 6
2½″ 65 46 207 7
3″ 80 46 220 8
4″ 100 52 241 12
5″ 125 56 262 18
6″ 150 56 276 28
8″ 200 60 305 45
10″ 250 68 352 70
12″ 300 78 376 94
14″ 350 78 400 115
16″ 400 102 439 160
18″ 450 114 466 195
20″ 500 127 502 240
24″ 600 154 570 330
Note: These values are typical references. Final dimensions must be confirmed with manufacturer drawings.

7. Test Pressure (Class 150 / PN16 Reference)

Test Type Test Pressure Standard
Shell (hydrostatic) 1.5 × rated pressure (~425 psi / 2.9 MPa) API 598 / ISO 5208
Seat (hydrostatic) 1.1 × rated pressure API 598 / ISO 5208
Low-pressure seat (pneumatic) 80 psi / 0.6 MPa API 598 / ISO 5208 (bubble-tight)
8. Product Features

Superior seawater corrosion resistance – C95800 excels in seawater, brackish water, and chloride-containing media, outperforming ordinary bronze and 304/316 stainless steel.
High strength & wear resistance – Tensile strength ≥ 655 MPa, yield strength ≥ 275 MPa, hardness 160–210 HBW; suitable for high-load conditions.
Fully lugged design – Easy pipeline maintenance and dead-end service; allows one-sided pipe removal.
Bidirectional zero leakage – Meets ISO 5208 Rate A bubble-tight sealing under full pressure differential.
Low operating torque – Optimized seat and bearing design reduces torque, supports high cycle operation.
Replaceable seat – Seals can be replaced on-site, extending valve life and reducing maintenance cost.
ISO 5211 top flange – Compatible with manual, pneumatic, and electric actuators without adapters.
Fire-safe seat option – Available for critical safety applications.
Excellent biofouling resistance – C95800 surface inhibits marine growth (barnacles, algae) for long-term seawater immersion.
9. Applications

Typical applications and industries include:

Marine & Offshore – Ballast water systems, seawater cooling, bilge/ballast lines, sea chests.
Desalination – Seawater intake, reverse osmosis pretreatment lines.
Petrochemical – Chloride-containing corrosive media pipelines.
Power generation – Seawater cooling systems, circulating water lines.
Offshore platforms (FPSO) – Seawater injection, firewater systems.
General industry – Mining, pulp & paper, food & beverage, wastewater treatment, and other corrosive environments.
10. Ordering Information

To ensure correct selection and quotation, please provide the following when ordering:

Nominal size (NPS / DN)
Pressure rating (Class / PN)
Flange standard and facing (ASME B16.5 / EN 1092 / JIS, etc.)
Service medium and its properties (seawater, acid, alkali, etc.)
Operating temperature range (°C)
Seat material (EPDM / NBR / VITON / RPTFE / PTFE)
Stem material
Operation type (lever / gearbox / electric / pneumatic)
Fire-safe construction required (Yes/No)
Special requirements (anti-static design, low fugitive emissions, etc.)
Disclaimer: This technical data sheet is based on general industry standards and publicly available manufacturer information. All data are for reference only. Final specifications are subject to actual product drawings and mutually agreed technical documents.