Stainless Steel Sprocket Wafer Knife Gate Valves

PZL73H Stainless Steel Sprocket Wafer Knife Gate Valve is a shut-off valve specially designed for the conveyance of media containing impurities. It features a sprocket-driven design with a sharp knife-type gate. By rotating the sprocket to lift or lower the valve stem, it can efficiently cut off solid particles and fibrous impurities in the media when closed, fundamentally preventing pipeline blockage.

The valve is fully made of 304/316 stainless steel with outstanding corrosion resistance, suitable for low to medium pressure and corrosive working conditions involving high-viscosity and impurity-containing media. It has a compact structure, light weight and labor-saving operation, making it especially ideal for narrow installation spaces and scenarios requiring high manual operating torque.

It is widely used in medium and large pipelines in industries such as wastewater treatment, mine tailings, papermaking pulp, building material powder, etc. With reliable performance, PZL73H Stainless Steel Sprocket Wafer Knife Gate Valves have become the preferred shut-off equipment for impurity-containing media pipelines in various industries.

Core Technical Parameters

Core Attributes

● Structure Type: Knife-shaped gate disc, outside screw & yoke, short face-to-face design, saving installation space and suitable for narrow working conditions.

● Connection Type: Wafer connection, strictly complies with GB/T 12221 standard for wafer valve installation, easy to install without extra large space, reducing pipeline construction cost.

● Sealing Type: Metal hard seal, hard alloy overlay on the sealing surfaces of gate disc and seat, stable sealing performance, resistant to erosion from media with hard particles, extended service life.

● Operation Type: Sprocket drive, torque amplified by chain transmission, labor-saving manual operation, solving the difficulty of manual operation for large-bore valves.

● Body Material: Stainless steel (304/316), excellent corrosion resistance, suitable for media with different corrosion levels and long-term use in highly corrosive conditions.

● Flow Channel Feature: Full bore straight channel, no throttling resistance, smooth media flow, strong anti-clogging ability, avoiding impurity accumulation affecting valve operation.

Model Interpretation

Each letter and number in model PZL73H has a clear meaning, helping buyers quickly identify specifications and accurately match requirements:

● P: Slag Discharge / Knife-shaped Structure, clearly marked as knife gate valve, specially designed for impurity-containing media.

● Z: Gate Valve, defines the main valve category.

● L: Sprocket Drive, indicates the operation mode, highlighting labor-saving advantage.

● 7: Wafer Connection, defines the installation connection type for general wafer installation.

● 3: Outside Screw & Yoke, marks the structure type for convenient maintenance after installation.

● H: Seat Face Overlayed with Hard Alloy, shows the sealing surface process, highlighting sealing reliability.

Component Materials

Core components of Stainless Steel Sprocket Wafer Knife Gate Valves are strictly selected for corrosion resistance, wear resistance and service life:

● Valve Body / Valve Plate Frame: 304/316 stainless steel, high strength and corrosion resistance, optional according to medium corrosivity.

● Knife Gate Disc: Stainless steel substrate + Stellite overlay, edge hardness ≥ HRC 55, high sharpness to cut solid impurities efficiently, wear-resistant and erosion-resistant.

● Valve Seat: Stainless steel with hard alloy overlay, specially for hard particle media, wear-resistant sealing surface ensuring long-term stable sealing.

● Valve Stem: 304 stainless steel, chrome-plated surface, enhanced wear and corrosion resistance, avoiding rust and jamming during long-term use.

● Gland Packing: Flexible graphite packing, high temperature and corrosion resistant, excellent sealing to prevent leakage.

● Chain Wheel / Chain: Stainless steel, suitable for long-term use in corrosive conditions, not easy to rust or damage, ensuring stable transmission.

Design & Manufacturing Standards

The whole production complies with national and industrial standards with strict quality control:

● General design of knife gate valves: JB/T 8528, CJ/T 282

● Wafer connection dimensions: GB/T 12221

● Sprocket transmission parts: GB/T 1243

● Pressure-temperature ratings: GB/T 12224

● Valve test and inspection: GB/T 13927, JB/T 9092

● Stainless steel material: ASTM A182

Selection & Installation & Maintenance Points

Selection Points

● For highly corrosive media (acid-alkali slurry), 316 stainless steel is preferred; 304 stainless steel can be used for general particle-containing media to reduce cost while ensuring stability.

● For large-bore valves (DN ≥ 500), 1:10 high-ratio sprocket is recommended to further reduce manual operation effort.

Installation Points

● Keep coaxial with pipeline flanges, tighten bolts symmetrically and evenly to avoid body deformation and leakage.

● Reserve sufficient rotation space on the sprocket operation side for smooth movement.

● Clean impurities and welding slag in the pipeline before installation; install filters upstream and downstream for better protection.

Maintenance Points

● Lubricate sprocket and chain regularly to prevent rust and jamming.

● Open and close the valve periodically in impurity-containing conditions to clean accumulated slag between disc and seat, maintaining sealing and operation flexibility.

Product Advantage

PZL73H Stainless Steel Sprocket Wafer Knife Gate Valves feature all-stainless steel construction, high-efficiency knife gate and labor-saving sprocket drive, perfectly matching impurity-containing and highly corrosive applications. Compact, easy to install and maintain, they effectively solve industry pain points such as pipeline blockage, difficult operation and seal leakage. They are widely used in medium and large pipelines across industries and serve as a reliable shut-off solution for impurity-containing media systems.