Cartridge Rubber Seat Wafer Butterfly Valves

Description

Cartridge Rubber Seat Wafer Butterfly Valve

Technical Data Sheet

1. Product Overview

The Cartridge Rubber Seat Wafer Butterfly Valve features a unique, replaceable, fully rubber-lined seat design. The seat is integrated into the valve body as a single-piece rubber liner, completely isolating the media from the body to provide excellent corrosion resistance. The seat can be replaced on-site without removing the disc or stem, significantly reducing downtime and lowering total lifecycle maintenance costs. Widely used in water supply and drainage, HVAC, water treatment, chemical, power generation, and marine systems.

2. Design Features & Benefits

Replaceable Cartridge Seat: Single-piece rubber liner allows for quick, in-line replacement without special tools.
Full Liner Encapsulation: The rubber seat completely encapsulates the body flow passage, preventing any media contact with the metal body.
Bidirectional Zero Leakage: Pre-compressed seat lip design ensures bubble-tight shut-off in both directions under low and high pressure.
Streamlined Disc: Pinless or streamlined pin connection design, offering low flow resistance and high flow capacity (Cv).
Integrated Stem Seals: Multiple O-ring seals on the upper and lower stem combined with self-lubricating bearings for maintenance-free operation.
ISO 5211 Top Flange: Standardized mounting interface for direct connection of handles, gearboxes, electric, and pneumatic actuators.
Modular Design: High interchangeability of body, seat, disc, and shaft components reduces spare parts inventory.
3. Technical Parameters

Item Specification Range
Nominal Diameter (DN) DN50 – DN600 (2″ – 24″)
Pressure Rating PN6 / PN10 / PN16 (Class 150)
Connection Type Wafer
Operating Temperature Range -4°F to 266°F (-20°C to 130°C), depending on seat material and pressure
Seat Material EPDM, NBR, FPM (Viton®), Silicone, White/Food Grade EPDM
Body Material Ductile Iron GGG40/50 (DI); Optional: Cast Iron, Cast Steel/Stainless Steel
Disc Material CF8M (SS316), CF8 (SS304), Duplex Stainless Steel, DI+Nylon 11 Coated, Aluminum Bronze
Stem Material SS420, SS431, SS316, Monel
Applicable Media Fresh water, wastewater, seawater, weak acids/alkalis, oils, compressed air, slurries, food fluids (depending on seat material)
Operation Lever Handle (DN50–DN150), Gearbox (DN200+), Electric Actuator, Pneumatic Actuator
Coating Epoxy powder coating, ≥250μm, standard color RAL 5015 Blue
4. Seat Material Operating Conditions

Seat Material Abbreviation Temperature Range Typical Media
Ethylene Propylene Diene Monomer EPDM -4°F ~ 248°F (-20°C ~ 120°C) Hot/cold water, steam condensate, acids, alkalis, alcohols, ketones
Nitrile Butadiene Rubber NBR 14°F ~ 176°F (-10°C ~ 80°C) Oils, hydraulic fluids, aliphatic hydrocarbons, water
Fluoroelastomer FPM (Viton®) 14°F ~ 302°F (-10°C ~ 150°C) Hot oils, solvents, strong acids, chemical media
Silicone Rubber VMQ -40°F ~ 356°F (-40°C ~ 180°C) Food products, hot air, low-concentration chemicals
Food Grade EPDM W-EPDM -4°F ~ 248°F (-20°C ~ 120°C) Drinking water, food, beverages
5. Bill of Materials

No. Component Standard Material Optional Material
1 Body Ductile Iron GGG50 / 65-45-12 Cast Iron HT250, Cast Steel WCB, SS304/316
2 Disc SS316 (CF8M) SS304, DI+Nylon11, Aluminum Bronze, Duplex Steel
3 Cartridge Seat EPDM NBR, FPM, Silicone, W-EPDM
4 Stem SS420 SS316, SS431, Monel
5 Upper Bearing PTFE + Bronze Backed Stainless Steel PTFE Composite
6 Lower Bearing PTFE Composite Same as above
7 O-Rings EPDM / NBR FPM
8 Retaining Ring / Gland Stainless Steel
9 Handle/Gearbox Aluminum Alloy / Ductile Iron Custom actuator interface
6. Applicable Standards

Item Standard
Design & Manufacturing API 609, EN 593, MSS SP-67, BS 5155
Face-to-Face Dimension EN 558-1 Series 20, API 609, ISO 5752 Series 20
Flange Compatibility EN 1092-2 PN10/PN16, ASME B16.5 Class 150, AS 2129 Table E
Top Flange ISO 5211
Pressure Testing API 598, ISO 5208 (Rate A – Zero Leakage)
Coating Conforms to WIS 4-52-01, GSK Standards
7. Dimensions & Weights (Example for PN16 Standard Configuration)

DN (mm) Inch L (mm) H1 (mm) H2 (mm) ΦD (mm) Actuator Flange ISO 5211 Approx. Weight (kg)
50 2″ 43 85 170 95 F05 2.5
65 2.5″ 46 95 185 109 F05 3.2
80 3″ 46 105 195 125 F05 3.8
100 4″ 52 118 215 155 F07 5.0
125 5″ 56 130 235 185 F07 6.8
150 6″ 56 145 260 215 F07 8.5
200 8″ 60 170 310 265 F10 14.0
250 10″ 68 195 355 320 F10 22.0
300 12″ 78 225 405 375 F12 30.0
350 14″ 78 255 460 425 F12 45.0
400 16″ 102 290 530 475 F14 65.0
500 20″ 127 350 630 585 F16 105.0
600 24″ 154 410 735 690 F16 160.0
Note: H1 – Centerline to top of stem height; H2 – Maximum disc height in fully open position. Dimensions may vary slightly depending on actuator interface.

8. Pressure-Temperature Ratings (for EPDM Seat / Ductile Iron Body)

Temperature (°F) -4 ~ 122 176 212 248
Temperature (°C) -20 ~ 50 80 100 120
Max. Operating Pressure (bar) 16.0 14.0 12.0 10.0
For other seat materials and body combinations, please refer to the corresponding EN or ASME pressure-temperature curves.

9. Installation & Maintenance Instructions

Installation Notes

Ensure the pipe flange inner diameter allows the disc to fully open before installation. The disc should be in a slightly open position (approx. 10°).
Tighten wafer connecting bolts gradually in a diagonal pattern to the recommended torque to avoid sealing face deformation.
Before replacing the cartridge seat, the pipeline must be drained and depressurized.
Cartridge Seat Replacement Procedure

Close and lock out the pipeline. Disconnect actuator power or air supply.
Remove bolts from both pipe flanges and remove the valve from the pipeline. The disc and stem do not need to be disassembled.
Carefully pry out the old rubber seat from the body edge using a flat-head screwdriver or a specialized pry tool.
Clean the body cavity and apply a small amount of neutral lubricant.
Evenly press the new seat into the body flow path, ensuring the lip edges are completely embedded.
Reinstall the valve, tighten fasteners to specification, and commission.
10. Ordering Information

To ensure fast and accurate selection, please provide the following:

Valve Model / Series
Nominal Diameter (DN) and Pressure Rating (PN/Class)
Body Material
Disc Material
Seat Material (EPDM/NBR/FPM…)
Operation Type (Lever/Gearbox/Electric/Pneumatic) and actuator specifications
Media Type and Working Temperature
Connecting Flange Standard (EN / ASME / AS)
Special coating or certification requirements (e.g., drinking water approvals WRAS, KTW, ACS)
Ordering Example: CSW-BFV-W-150-DI-316-EPDM-LEV specifies a Cartridge Wafer Butterfly Valve, DN150, Ductile Iron body, Stainless Steel 316 disc, EPDM seat, with lever handle.