Fluid Process Equipment - Pump **Name:** NP-L Low Abrasive Slurry Pump **Pump Type:** Centrifugal **Drive Type:** ZVZ/CRZ/CV/DC **Power:** Motor/Diesel **Discharge Size:** 20 to 550 mm **Capacity:** 2.34–7920 m³/h **Head:** 6–50 m **Description:** The Naipu® NP-L series is a rugged, heavy-duty slurry pump designed for medium to lower head applications. It combines the proven design principles of the NP-AH(R) series with high-efficiency impellers at an attractive initial cost. This pump is ideal for demanding environments and offers improved efficiency without compromising on durability. The NP-L series provides interchangeable liner options, including both metal and various grades of elastomers, making it adaptable to different applications. **Typical Applications:** - Chemical Processing - Heavy Minerals - Plant Water Supply - Thickener Overflow - Paper and Pulp - Slag Granulation **Structure:** The pump consists of several key components, including: - Frame Plate (032) - Intake Joint (060) - Discharge Joint (132) - Throat Bush (083) - Volute Liner (110) - Impeller (147) - Stuffing Box Seal (122) - Frame Plate Liner (036) - Cover Plate (013) - Cover Plate Liner (018) - Volute Cover Seal (124) - Frame Plate Liner Insert (041) **Materials of Construction:** | Standard | Liners | Impellers | Casing | Base | Expeller | Expeller Ring | Shaft Sleeve | Seals | |----------|--------|-----------|--------|------|----------|---------------|--------------|-------| | | Chrome Alloy, Natural Rubber | Chrome Alloy, Natural Rubber | SG Iron | SG Iron | Chrome Alloy or SG Iron | Chrome Alloy or SG Iron | SG Iron | Rubber and Nitrile | | Options | Acid Resist™ Neoprene, Butyl, Nitrile, Hypalon | Acid Resist™ Neoprene, Butyl, Nitrile, Hypalon | N/A | MS, Fabricated | Acid Resist™ | Acid Resist™ | Acid Resist™ | Neoprene, Viton | **Performance Parameters:** Below is the performance data for various models in the NP-L series: | Type | Allowable Mating Max. Power (kW) | Clear Water Performance (Q m³/h) | Head (m) | Speed (rpm) | Max Efficiency (%) | NPSH (m) | No. of Vane | Impeller Diameter (mm) | |------|----------------------------------|-----------------------------------|----------|-------------|--------------------|-----------|-------------|-------------------------| | 20A-NP-L | 7.5 | 2.34–10.8 | 6–37 | 1400–3000 | 30 | – | 4 | 152.4 | | 50B-NP-L | 15 | 16.2–76 | 9–44 | 1400–2800 | 55 | 3.5–8 | 5 | 190 | | 75C-NP-L | 30 | 18–151 | 4–45 | 900–2400 | 57 | 3–6 | 4 | 229 | | 100D-NP-L | 60 | 50–252 | 7–46 | 800–1800 | 60 | 2–3.5 | 4 | 305 | | 150E-NP-L | 120 | 115–486 | 12–51.5 | 800–1500 | 65 | 2–6 | 4 | 381 | | 200E-NP-L | 120 | 234–910 | 9.5–40 | 600–1100 | 64 | 3–6 | 4 | 457 | | 250F-NP-L | 120 | 396–1425 | 8–30 | 500–800 | 77 | 2–10 | 5 | 550 | | 300S-NP-L | 560 | 468–2538 | 8–60 | 400–950 | 79 | 2–10 | 5 | 653 | | 350S-NP-L | 560 | 650–2800 | 10–59 | 400–840 | 81 | 3–10 | 5 | 736 | | 400ST-NP-L | 560 | 720–3312 | 7–51 | 300–700 | 80 | 2–10 | 5 | 825 | | 450ST-NP-L | 560 | 1008–4356 | 9–48 | 300–600 | 80 | 2–9 | 5 | 933 | | 550TU-NP-L | 1200 | 1980–7920 | 10–50 | 250–475 | 86 | 4–10 | 5 | 1213 | This comprehensive pump series is well-suited for industrial applications where reliability, efficiency, and durability are essential. Whether you're dealing with low abrasive slurries or challenging chemical environments, the NP-L series delivers consistent performance and long-term value.

For LIUGONG Cylinder Seal Kit

Precautions for daily maintenance of hydraulic cylinders
1. Regularly inspect the sealing components of the hydraulic cylinder, such as O-rings and gaskets, to ensure that they are intact and undamaged. If there is wear or aging, they should be replaced in a timely manner.
2. Regularly check the liquid level of the hydraulic cylinder and keep it within the specified range. If the liquid level is too low, add hydraulic oil in a timely manner.
3. Regularly inspect the connection parts of the hydraulic cylinder, such as oil pipes and joints, to ensure their tightness and reliability. If there is any looseness, it should be tightened in a timely manner.
4. Regularly clean the outer surface of the hydraulic cylinder to prevent dust, sand, and other debris from entering the interior of the cylinder and affecting its normal operation.
5. Regularly inspect the surface of the piston rod of the hydraulic cylinder, and promptly repair or replace it if there are scratches or wear.
6. Regularly inspect the hydraulic system of the hydraulic cylinder, and promptly handle any problems such as oil leakage or unstable pressure.
7. When the hydraulic cylinder is not in use for a long time, its hydraulic oil should be drained to avoid oil aging, deterioration, and affecting the normal operation of the hydraulic system.
8. When repairing or replacing hydraulic cylinders, attention should be paid to safety to avoid sudden movement or pressure release of the hydraulic cylinder, which may cause personal injury or equipment damage.


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