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The LINKV stainless steel knife gate valve with pneumatic actuator is designed for on-off control of slurry, powder, and fibrous media in abrasive flow environments. Manufactured in a 49,000 m² production facility with over 200 technical staff, each valve undergoes 100% pressure testing before shipment. Available in sizes DN50 to DN600, with CF8 (304) and CF8M (316) stainless steel body options, this valve series conforms to ASME B16.34 and API 6D standards. Certifications include ISO 9001:2015, CE/PED, and TS special equipment license. The pneumatic actuator provides fast stroke times within 3 to 8 seconds, suitable for process automation systems in mining, pulp and paper, wastewater treatment, and chemical processing operations.
The knife gate valve features a thin, sharp-edged gate blade that shears through solid particles and fibrous materials during closing. The gate blade is made of CF8M stainless steel with a polished surface finish (Ra ≤ 0.8 μm), reducing friction and buildup of media residues. The unidirectional sealing design provides tight shutoff against media flow from the seat side, with leakage rate conforming to API 598 standards.
Equipped with a double-acting pneumatic cylinder as standard, with spring-return fail-safe configuration available as an option. The actuator operates at supply pressure 4 to 7 bar, with stroke time ranging from 3 to 8 seconds depending on valve size. Position indicators and limit switches are included for visual and electrical status feedback. Solenoid valves and air filter regulators can be supplied as mounted accessories for complete actuation packages.
The valve seat uses replaceable polyurethane or EPDM rubber seals, selected based on media abrasiveness and operating temperature. The seat is designed for in-line replacement without removing the valve from the pipeline. Stem packing consists of multiple layers of PTFE V-rings with a live-loaded gland design, maintaining consistent sealing force through thermal cycles and pressure fluctuations.
Parameter | Specification |
|---|---|
Size Range | DN50 – DN600 (2" – 24") |
Pressure Rating | PN10, PN16; Class 150 |
Body Materials | CF8 (304 stainless steel), CF8M (316 stainless steel) |
Gate Material | CF8M stainless steel, polished |
Seat Material | Polyurethane (standard), EPDM, NBR (optional) |
Stem Material | 304 stainless steel |
End Connections | Wafer type, Lug type, Flanged (ANSI 150, DIN PN10/16) |
Actuator Type | Double-acting pneumatic cylinder (standard); Spring-return (optional) |
Air Supply Pressure | 4 – 7 bar |
Stroke Time | 3 – 8 seconds (size dependent) |
Temperature Range | -10°C to +80°C (PU seat); -20°C to +120°C (EPDM seat) |
Leakage Rate | Zero visible leakage per API 598 (seat test) |
Standard Compliance | ASME B16.34, API 6D, ISO 5752 |
This knife gate valve handles media containing solid particles, fibers, or viscous substances that conventional gate valves cannot effectively shut off. Typical media includes mining slurries with up to 70% solid content, pulp stock in paper manufacturing, sewage sludge with 3-8% dry solids, powder and granular materials in food processing, and chemical suspensions with abrasive particles.
The valve series is installed in process lines across multiple industrial sectors. In mining operations, it controls tailings slurry and concentrate transport pipelines. In pulp and paper mills, it regulates stock flow between processing stages. Wastewater treatment plants use it for sludge handling and chemical dosing lines. Chemical processing facilities deploy it for abrasive chemical suspensions and filtration system isolation. The pneumatic actuation enables integration with PLC and DCS control systems for automated process management.
Each valve body is cast with investment casting technology, followed by CNC machining with tolerance control within ±0.05 mm. All pressure-containing parts undergo 100% PMI (Positive Material Identification) verification using OBLF spectrometers. Every completed valve passes hydrostatic shell testing at 1.5 times rated pressure and high-pressure seat testing at 1.1 times rated pressure, with zero visible leakage required for acceptance. Each casting carries a unique heat number with material and production records traceable for 10 years.
The manufacturing facility operates under ISO 9001:2015 quality management systems. Valves carry CE/PED certification according to EU Pressure Equipment Directive. Production complies with API 6D and ASME B16.34 design standards. The TS special equipment manufacturing license is held in accordance with Chinese pressure vessel regulations. Material certificates include REACH and RoHS compliance declarations for chemical substance restrictions.
Polyurethane seats are recommended for applications with high solid content and abrasive particles, as they offer better wear resistance compared to rubber seats. For operating temperatures above 80°C, EPDM seats with reinforced fillers are available for higher temperature resistance.
Yes, spring-return actuators can be specified for fail-safe operation. Fail-close configuration uses spring force to close the valve upon air supply loss, while fail-open configuration uses springs to open the valve. Double-acting actuators hold position on air loss. The appropriate configuration depends on process safety requirements.
For continuous slurry applications, seat inspection is recommended every 3 to 6 months depending on media abrasiveness. Seat replacement can be performed in-line without removing the valve body from the pipeline. Stem packing adjustment may be required annually. Complete actuator service intervals are typically 2 to 3 years under normal operating conditions.
