Single Coil Spring – RPW-042
Single Coil Spring – RPW-042
Overview
HydroMax Seal RPW-042 | Single Coil Spring Seal for Alfa Laval LKH Pumps
The RPW-042 is a single-coil spring mechanical seal engineered specifically for Alfa Laval LKH pump models 10, 25, 30, 35, and 40. This internal wet seal features a monolithic rotary head and is unbalanced with an O-ring secondary seal. Designed for hygienic and general fluid handling applications, it uses a pin drive mechanism, single spring, and threaded stationary seat.
Factory-engineered for durability and efficient sealing, the RPW-042 is shrink-fitted and offers dependable performance at moderate speeds and pressures.
Product Description
Design Features
- Internal wet seal suitable for Alfa Laval LKH 10, 25, 30, 35 & 40
- Monolithic rotary head for enhanced thermal stability
- O-ring unbalanced design
- Pin driven for positive engagement
- Shrink-fitted with threaded stationary face
- Designed for clean-in-place and hygienic service environments
Technical Specifications
- Seal Shaft Size:
1.25” - Inboard Seal Face Combination:
Car/TC, Car/SiC - Elastomers:
Viton, ERP - Shaft Speeds:
up to 10 m/s - Pressures:
up to 5 Barg (72 psig) – Shaft Size Specific
HydroMax Seal offers precision-fit mechanical seals for OEM pump models, including industry-standard solutions for food, beverage, and pharmaceutical-grade pumps.
Typical Applications & Industry Use Cases
The RPW-042 Single Coil Spring Mechanical Seal is a straightforward internal wet seal designed for parallel-shaft rotating equipment. It features a single helical coil spring and elastomeric secondary seals to deliver reliable performance in general industrial fluid services. The set-screw drive provides secure mechanical engagement, and the simple, reliable design makes this seal suitable for a wide range of standard applications requiring uncomplicated, cost-effective sealing.
Industries Served
Water and wastewater treatment
Chemical and petrochemical processing
Industrial process pumping
HVAC and building services
Agricultural and irrigation systems
General fluid transfer and manufacturing
Equipment & Use-Case Scenarios
- Parallel-shaft centrifugal and process pumps requiring basic internal wet sealing
- Services with clean to moderately contaminated fluids
- Applications under low to moderate pressure and temperature conditions
- Routine maintenance and part replacement in standard pump systems
Why It Fits These Applications
- Single coil spring design: Maintains steady radial load to hold seal faces in contact
- Elastomeric secondary seals: Provide reliable sealing against shaft and housing surfaces
- Set-screw drive: Secures positive mechanical engagement and simplifies installation
- Internal wet configuration: Uses process fluid for lubrication and cooling
- Simple, robust construction: Ideal for cost-effective, general industrial services
Installation Guidelines
Pre-Installation Preparation
Clean and inspect the pump shaft, seal chamber bore, and gland surfaces. Remove corrosion, debris, and surface imperfections to ensure proper sealing surface contact and alignment.
Seal Installation
Slide the RPW-042 seal onto the shaft into the seal chamber. Orient the coil spring and elastomer elements correctly relative to the shaft and housing. Tighten the set screws evenly to secure the assembly without over-torquing.
Orientation Check
Verify that the seal’s orientation matches the direction of shaft rotation and fluid flow, where applicable.
System Readiness
Ensure that the seal chamber is flooded with process fluid if required by your application and that all components are securely positioned before starting the equipment.
Maintenance & Inspection Best Practices
- Routine Visual Checks: Inspect the seal area for signs of leakage, unusual vibration, or temperature variation
- Seal Face Condition: During scheduled maintenance, examine seal faces for wear, scoring, or deposit build-up
- Secondary Seal Care: Inspect elastomeric O-rings for hardening, cracking, or deformation and replace as needed
- Operating Logs: Track pressures, temperatures, and shaft speed to support predictive maintenance planning
- Spare Parts Inventory: Keep replacement springs, secondary seals, and seal faces available to minimise downtime
Service & Support Options
- Application Review: Confirm elastomer compatibility and overall seal selection based on fluid chemistry and operating conditions
- Installation Assistance: Technical guidance to help ensure correct orientation and secure engagement
- Preventive Maintenance Scheduling: Establish regular intervals for inspection and component replacement based on duty cycles
- Seal Upgrade Evaluation: If service conditions become more demanding, consider alternate designs or materials for improved performance
Related Products
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
