HZT038218900 Mechanical Seal – Silicon Carbide + Carbon + Stainless Steel Mechanical Seal for HZT25MBA Marine Vacuum Discharge Pump | High Vacuum Toilet Seals | Vacuum Toilet Systems for Ships, Yachts, and Land-Based

I. Product Overview

The HZT038218900 mechanical shaft seal is one of the core sealing components of the HZT023280010 (25MBA marine vacuum sewage pump). It is installed between the HZT023260400 (distance sleeve) and the HZT023280030 (shaft seal flange).
It forms a complete dynamic sealing system with the HZT023219000 (rotor housing), HZT023219100 (pressure chamber), and HZT021265401 (rotor).

This component’s primary function is to prevent vacuum leakage at the shaft penetration point and ensure the integrity of the negative pressure chamber within the pump body. It forms a stable gas-liquid barrier through the liquid film on the end faces of the dynamic and static rings, making it a key component in achieving high vacuum and high-endurance operation in the 25MBA pump.

II. Structure and Materials

| Components | Materials | Functional Description |
| ——————- | ——————- | ————————– |
| Rotary Ring | Carbon Graphite | Rotates with the shaft, forming a friction seal with the stationary ring |
| Stationary Ring | SIC (Silicon Carbide) | Installed in the flange, remains stationary, forming a sealing surface |
| Spring and Metal Parts | Stainless Steel (CNC Machined) | Provides elastic force and corrosion-resistant support |
| Seal Ring | NBR / EPDM | Absorbs axial vibration, compensates for variations in the gap between the rotary and stationary rings, and ensures a stable sealing compression ratio |

Manufacturing Process

* Precision CNC Machining
* End Surface Lapping (Lapping) Flatness ≤ 2µm
* Dynamic Balancing Test and Vacuum Seal Test (-0.09MPa for 72 hours, no leakage)
* All components undergo corrosion salt spray testing and temperature resistance testing

III. Performance Advantages

1️⃣ High Vacuum Sealing Capability
The end-face liquid film seal principle ensures stable negative pressure in the pump chamber, making it suitable for vacuum sewage and vacuum toilet systems.

2️⃣ Superior Corrosion and Wear Resistance
The SIC+316SS composite material construction enables long-term operation in seawater, blackwater, and solid-contaminated wastewater.

3️⃣ High-Precision Matching Structure
Precision fit with the HZT023260400 (spacer sleeve) and HZT023280030 (flange) for easy assembly and stable sealing.

4️⃣ Long-Life Operation
The carbon graphite friction surface exhibits extremely low wear (friction coefficient μ≈0.08), resulting in low operating noise and a long lifespan.

5️⃣ Highly Maintainable and Replaceable
The modular structure allows for quick replacement and is compatible with the same series of vacuum pumps (HZT25MBA / HZT15MBD differ only in structure).

IV. Applications

The HZT038218900 is not only suitable for the HZT023280010 (25MBA marine vacuum sewage pump), but is also widely used in the following systems and equipment:

* 🚢 Marine & Yacht Vacuum Sewage Systems
* 🛳 Offshore Vacuum Discharge Systems
* ⚓ Port & Harbor Vacuum Stations
* 🚽 Land-Based & RV Vacuum Toilet Systems
* 🧱 Vacuum Sewage Collection & Sanitary Units

With its excellent sealing performance and durable materials, the HZT038218900 is a reliable vacuum sealing solution for ships, yachts, and offshore applications.

V. Technical Support and Supply

HZT provides complete equipment, system design, and accessory services:

* Comprehensive solutions for marine vacuum pumps and sewage vacuum pumping stations
* OEM system and shipyard support
* Rapid parts supply and repair service

📧 Technical Support Email: SJDT1199@gmail.com
🌐 Official Website: www.vacuumtoiletparts.com

1. HZT029151001 – Flap Valve Seat
2. HZT037302200 – Flap Valve Disc
3. HZT029151003 – Pressure Plate
4. HZT029150310 – Suction Chamber Cover
5. HZT037219210 – O-Ring
6. HZT029150320 – Suction Chamber
7. HZT020202900 – Hexagon Socket Seal
8. HZT029151900 – Lock nut
9. HZT029150400 – Rotating blade
10. HZT029150500 – Stationary blade
11. HZT029152401 – Half-threaded hexagonal bolt with spring washer (M10x170)
12. HZT029150601 – End flange
13. HZT029150701 – Rotor (impeller)
14. HZT029150800 – Rotor housing
15. HZT029151800 – Spacer
16. HZT038201500 – Shaft seal
17. HZT034507420 – Hose clamp
18. HZT034507500 – Hose
19. HZT029150391 – Shaft Seal Flange
20. HZT029150901 – Pressure Chamber (Water Discharge Chamber)
21. HZT029150310-02 – Suction Cover (Metal Plate)
22. HZT029150450 – Cutter Assembly
23. HZT/- – Motor – 2.2kW – Marine Motor
24. HZT029015001 – 15MBD Vacuum Pump
25. HZT023280061 – Flap Valve Seat
26. HZT037302100 – Flap Valve Disc
27. HZT023280091 – Pressure Plate
28. HZT023280050 – Suction Chamber Cover
29. HZT037219260 – O-ring
30. HZT023280070 – Flange Fastener
31. HZT023280080 – Flange
32. HZT023280040 – Suction Chamber
33. HZT020202900 – Plug
34. HZT020203100 – Rotating Blade
35. HZT020203100 – Stationary Blade
36. HZT021201000 – Blade Holder
37. HZT036202010 – Half-thread Hexagon Bolt (with Spring Washer) M12x220
38. HZT023200210 – Suction Chamber End Plate
39. HZT023219000 – Rotor Housing
40. HZT021265401 – Rotor (Impeller)
41. HZT021217000 – RG 3/8” Plug
42. HZT023219000 – Pressure Chamber (Discharge Chamber)
43. HZT023260400 – Isolation Sleeve
44. HZT038218900 – Shaft Seal
45. HZT023280030 – Shaft Seal Flange
46. HZT023280050-02 – Suction Chamber Cover (Metal Sheet)
47. HZT/- – Motor – 3.0 kW – Marine Motor
48. HZT023280010 – 25 MBA Vacuum Pump

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