Mechanical Seal Style RKCMS
Flushless Slurry Seal for Solids Handling Applications
Single cartridge, stationary multi-spring, for open and taper-bore seal chambers
The Style RKCMS is engineered for demanding slurry pumping services across mining and mineral processing, lime slurries, and salt-precipitating solutions. Its single-cartridge design installs on open and taper-bore seal chambers, with abrasion- and corrosion-resistant wetted materials for long service life in aggressive process conditions.
- Flushless operation: Single-face sealing of high-solids slurries, up to 40% by weight, in taper-bore seal chambers, with no external flush required.
- Engineered for harsh service: Abrasion- and corrosion-resistant materials, FlexICE™ diamond face treatment options, and a large open cavity on the atmospheric side of the faces keeps solids from building up quickly.
- Easy fitment, simple maintenance: A compact cross-section drops onto common pump platforms including ANSI and other general process pumps, with wet and dry mount gland configurations to fit a wide range of pump arrangements.
Features & Specs
Product Overview | Single Cartridge Flushless Slurry Seal
The Style RKCMS addresses one of the harder problems in slurry sealing: keeping faces cool and intact, while removing the cost, complexity, and water consumption of an external flush. The compact, single-cartridge construction installs on ANSI pumps and other common pump platforms that are in solids-handling services.
The keys to success with this seal:
- Lubricating, heat-dissipating face materials that hold up in high-solids environments where general-purpose face materials do not shed heat quickly enough.
- A separate inboard face retainer that lets harder, application-specific wear materials drop in without cartridge-level redesign or cost penalty.
- Atmosphere-side spring loading that isolates all springs from the process and prevents pump hydraulics from imparting unbalanced loads on the faces.
- Stationary multi-spring construction that compensates for shaft runout and seal chamber misalignment common in older or refurbished pump installations.
- Hardened set screws sized to hold under high-pressure service and in series-pump arrangements where standard fasteners back out under load.
- Wet and dry mount gland options that adapt the seal to open, taper-bore, and conventional seal chambers across mixed pump fleets.
Tailored Solutions for Demanding Services
The Style RKCMS can be configured with optional features for service-specific requirements, including:
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- FlexICE™ diamond face treatment for dry-running and heavy-abrasive services
- Tungsten carbide face options where silicon carbide is not the recommended choice
- FFKM, EPDM, or FKM elastomers for chemically aggressive process fluids
- Outboard quench containment with low-pressure water flush or grease quench to capture and remove solids that migrate past the faces
- High chrome or Duplex/Super-Duplex Stainless metal parts for abrasive and corrosive process environments
Operating Parameters
| Temperature: | -4 °F to 425 °F (-20 °C to 218 °C) |
| Pressure: | 500 psi (34.5 bar) |
| Shaft Speed: | 4,500 fpm (23 m/s) |
| Max. Solids % (w/w): | 40% |
Materials of Construction
| Faces: | Silicon carbide (various grades), Tungsten carbide (opt.), FlexICE™ diamond treatment |
| Elastomers: | TFE/P (std), FKM, EPDM, FFKM |
| Springs: | Alloy C-276 |
| Metal Parts: | Alloy 255 (std), 316 SS, High Chrome |
Max temperature, pressure, and speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time. Contact Flexaseal if in doubt.
Design Features
- Engineered Slurry-Duty Face Materials
Face Materials combine lubricating and heat-dissipating properties selected to extend face life under abrasive slurry loads. - Cushioned Monolithic Rotary Face
The one-piece, O-ring mounted rotary face absorbs vibration and pressure pulses for stable operation in aggressive process environments. - Separate Inboard Face Retainer
A dedicated retainer accommodates harder, application-specific wear materials without driving up overall cost. - Large Open Inner Seal Area
The open inner seal area keeps solids from packing around the primary face, preventing face hangup and heat buildup. - Large Cross-Section Stator O-Ring
The stator O-ring rides on the polished face surface for full range of face motion, with open retainer geometry that keeps solids out. - Optional FlexICE™ Diamond Face Treatment
Diamond-coated faces extend service life in dry-running and heavy-abrasive applications where standard face materials wear quickly. - Wet and Dry Mount Gland Configurations
Two gland configurations simplify fitment across open and taper-bore seal chambers and mixed pump fleets. - Hardened Set Screws
Heat-treated set screws hold their grip under high-pressure service and in series-pump applications. - Outboard Quench Containment
A lip seal contains a low-pressure water flush or grease quench that captures any solids passing the faces. - Static Multi-Spring Design
Heavy-duty springs isolated on the atmosphere side prevent hydraulic forces in the pump from imparting unbalanced loads on the faces.
Common Applications
Common Applications
- Mineral processing slurries
- Mine dewatering
- Lime slurries
- Salt-precipitating solutions
- Pulp and paper stock services
- FGD (flue gas desulfurization) slurries
- Phosphate slurries and phosphoric acid
- Coal prep
Download our Data Sheet