OEM RPW-115 Single Cartridge Seal – Heavy-Duty Pump Sealing Solution
OEM RPW-115 Single Cartridge Seal – Heavy-Duty Pump Sealing Solution
Overview
HydroMax Seal RBW-125 | Rotary Pusher Wet Single Cartridge Seal for Flowserve MkII Pumps
The RBW-125 is a rotary pusher wet (RPW) single-cartridge mechanical seal designed specifically for Flowserve MkII pumps. Engineered with flush environmental ports and an outboard restriction bush, this seal delivers stable performance in demanding fluid handling systems.
Featuring hydraulically balanced, shrink-fitted seal faces within a metal bellows rotary and O-ring secondary seals, the RBW-125 is ideal for use on parallel rotating shafts. This cartridge seal is set screw driven to ensure secure, reliable installation and torque transfer. Supplied fully assembled and factory-tested.
Product Description
Design Features
- Designed for Flowserve MkII pumps
- Hydraulically balanced metal bellows rotary
- Flush port and restriction bush for effective environmental control
- Shrink-fitted seal faces for dimensional stability under pressure
- Set screw driven for secure shaft engagement
- O-ring secondary seals for reliable sealing
- Factory assembled and tested for performance assurance
Technical Specifications
| Seal Shaft Sizes | 1.125″, 1.375″ |
| Inboard Seal Face Combinations | Car/TC Car/SiC TC/TC TC/SiC SiC/SiC |
| Gasket Materials | GFT AF1 |
| Elastomers | Viton ERP Aflas Kalrez |
| Shaft Speeds | Up to 20 m/s |
| Pressures | Up to 232 psig – Shaft Size Specific |
| Temperatures | Up to 230°F |
WARNING:
Seal performance values are based on individual parameters. Do not combine maximum pressure, speed, and temperature values at the same time.
Typical Applications & Industry Use Cases
The RPW-115 Single Cartridge Mechanical Seal is a multi-spring, hydraulically balanced cartridge seal designed for use on parallel-shaft rotating equipment requiring a robust, reliable sealing solution. It incorporates a flush port to support environmental fluid circulation and O-ring secondary seals for dependable performance in industrial pump services. Supplied fully assembled, it provides a ready-to-install solution that simplifies maintenance and reduces installation time.
Industries Served
Water and wastewater treatment
Chemical and petrochemical processing
Industrial and utility pumping systems
Food and beverage fluid handling
Pharmaceutical and process manufacturing
General industrial and OEM equipment applications
Equipment & Use-Case Scenarios
- Single-seal arrangements on parallel-shaft centrifugal and process pumps
- Services where balanced face loading improves stability and wear resistance
- Applications that benefit from flush fluid circulation to control heat and contaminants
- OEM replacement and routine maintenance in standard cartridge seal cavities
Why It Fits These Applications
- Multi-spring balanced configuration: Ensures uniform face loading across varying operating conditions, improving reliability and service life
- Hydraulically balanced design: Reduces seal face loading and minimises wear under fluctuating pressures
- Flush port: Supports clean fluid circulation for cooling and contaminant control
- Set-screw drive: Provides secure mechanical engagement and reliable torque transfer
- O-ring secondary seals: Compensate for minor shaft movement and surface irregularities
- Factory-assembled cartridge design: Simplifies installation and minimises alignment errors
Installation Guidelines
Pre-Installation Preparation
Thoroughly clean and inspect the pump shaft, seal chamber bore, and gland surfaces. Remove corrosion, debris, or surface defects to ensure proper alignment and sealing contact.
Cartridge Installation
Insert the RPW-115 cartridge seal into the seal housing. Ensure the flush port is correctly oriented for the intended piping arrangement. Tighten set screws evenly to secure the cartridge without distortion.
Alignment & Fit
Confirm the cartridge is fully seated against the gland face and correctly aligned axially. Proper seating ensures consistent face contact and long-term performance.
Startup Procedure
Initiate flush fluid circulation before starting the pump. Gradually bring the equipment to operating speed and pressure while monitoring for leakage, vibration, or abnormal temperature.
Maintenance & Inspection Best Practices
- Routine Visual Checks: Inspect the seal area for leakage, vibration, or unexpected heat
- Seal Face Inspection: During scheduled maintenance, check seal faces for wear, scoring, or deposits
- Secondary Seal Condition: Inspect O-rings for hardening, cracking, or deformation and replace as needed
- Operating Logs: Track pressure, temperature, and shaft speed to support predictive maintenance
- Spare Parts Planning: Maintain replacement seal faces, springs, and elastomer components to minimise downtime
Service & Support Options
- Application Review: Confirm seal materials and configuration match fluid chemistry and operating conditions
- Installation Assistance: Technical guidance to ensure correct orientation and secure engagement
- Preventive Maintenance Scheduling: Establish inspection and replacement intervals based on service severity
- Seal Upgrade Evaluation: If operating conditions intensify, consider enhanced materials or alternative cartridge designs
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Contact HydroMax Seal
Contact HydroMax Seal today for innovative solutions, expert guidance, and over a century of engineering excellence. Your journey to mechanical sealing excellence starts with HydroMax Seal!
E-Mail: sales@hydromaxseal.com
Address: 18511 Beaumont Hwy Building D
Houston, TX
77049
