The Laux Valve DN300 wafer butterfly valve with cartridge seat and rubber coated disc is a cost-effective, field-serviceable flow control solution for water, wastewater, HVAC, and general industrial applications. The replaceable cartridge seat design allows the rubber liner to be swapped out in the field without removing the valve body from the pipeline, reducing maintenance downtime and lifecycle cost.
The rubber coated disc provides enhanced corrosion resistance and improved sealing performance, with the elastomer coating forming an additional sealing layer against the cartridge seat. Suitable for bi-directional bubble-tight shut-off at Class 150 pressure ratings.
| Parameter | Specification |
| Size | DN300 (12") |
| Valve Type | Concentric Wafer Butterfly Valve |
| Body Design | Wafer type, short pattern |
| Seat Type | Replaceable cartridge (mechanically retained) |
| Body Material | Ductile Iron ASTM A536 65-45-12 |
| Disc Material | Ductile Iron + Full Rubber Coating (EPDM or NBR) |
| Stem Material | Stainless Steel 13% Cr / 316 SS / 17-4 PH |
| Seat Material | EPDM (Standard); NBR / Hypalon (Optional) |
| Body Coating | Fusion Bonded Epoxy, min 250 microns, Blue (RAL 5017) |
| Face-to-Face | 78 mm (EN 558 Series 20 / API 609 Short) |
| Flange Drilling | ASME B16.5 Class 150 / EN 1092-2 PN10-PN16 |
| Pressure Rating | 200 psi (13.8 bar) at 23°C (EPDM); 150 psi (10.3 bar) at 50°C |
| Temperature Range | EPDM: -20°C to +90°C; NBR: -10°C to +70°C |
| Operation | Gear Operator (Standard 12" size); Lever or Actuator (Optional) |
| Design Standard | API 609 Category A, EN 593 |
| Testing | Shell: 1.5x Rated Pressure; Seat: 1.1x Rated Pressure (bubble-tight) |
| Certification | ISO 9001:2015, CE/PED, NSF/ANSI 61 (Potable Water) |
The cartridge seat is a one-piece elastomer liner that lines the full bore of the valve body. The liner has molded-in flange faces that extend beyond the body faces, creating integral sealing surfaces against the pipe flanges. The liner is retained in the body by:
To replace the seat: depressurize the line, unbolt the pipe flanges, remove the old liner, insert the new liner, and re-bolt. The valve body stays in place.
The ductile iron disc is fully encapsulated with a vulcanized rubber coating (matching the seat material). The rubber coating covers the entire disc surface including the edges, creating a homogeneous rubber-to-rubber sealing interface when the valve is closed. Benefits include:
A cartridge seat butterfly valve uses a mechanically retained rubber liner (cartridge) as the sealing element, rather than a chemically bonded (vulcanized) seat. The liner can be replaced in the field when worn, without removing the valve body from the pipeline.
To replace the seat: (1) Close the valve and depressurize the line, (2) Unbolt and separate the pipe flanges, (3) Remove the old liner from the valve body, (4) Insert the new liner, ensuring it fully seats in the body groove, (5) Re-bolt the flanges, (6) Test for leakage. The entire procedure takes approximately 15-30 minutes.
The rubber coated disc provides rubber-to-rubber sealing against the cartridge seat, resulting in better sealing conformity, lower operating torque, and extended seat life. The rubber coating also protects the disc from corrosion, making it suitable for mildly aggressive media.
Standard: EPDM (water, wastewater, HVAC, -20°C to +90°C). Optional: NBR (oil-contaminated water, fuel, -10°C to +70°C), Hypalon (chemical vapors, ozone, up to +100°C).
Yes. The valve is fitted with an ISO 5211 F12 mounting pad (standard for DN300). Compatible with pneumatic actuators (double-acting or spring-return) and electric actuators (on-off or modulating with 4-20 mA feedback). Gear operator included as standard for manual operation.
78 mm per EN 558 Series 20 (short pattern) and API 609 Short Pattern. This is the standard wafer face-to-face dimension for DN300 and is interchangeable with major manufacturers.
For pricing, dimensional drawings, actuator sizing, or lead times:
Email: james@lauxvalve.com | Tel: +86 18920833829 | Website: www.lauxvalve.com
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
