Single Cartridge Mechanical Seals

Flexaseal offers a wide variety of single cartridge mechanical seals, each designed as a reliable solution for the toughest applications. Our single cartridge seals are easy to install and minimize the number of moving parts that can lead to equipment failure. Specially designed single cartridge seals are also available for highly corrosive or high-temperature environments. Cost-effective upgrades are available when circulation, vent, & drain glands are required.

RB - Single Rotating Welded Metal Bellows Cartridge with Circulation Gland

• Part of Flexaseal’s integrated/platform single cartridge seal design
• Patented (Patent Number US 7,979,986) Plunger-Lock drive
• Only two static O-rings – cost savings are substantial when perfluorelastomers are required
• Rotating welded metal bellows are self-cleaning during operation
• Simple cartridge seal installation – slide seal onto the shaft, bolt to box face, tighten set screws, and remove spacers
• Hydraulically balanced design
• No moving elastomers. No fretting – No hang-up
• Minimal number of parts. Simple design means fewer pieces to cause problems
• Metric sizes readily available
• Sleeve is isolated from product
• Quick inexpensive repairs

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

SMS - Single Stationary Multi-Spring Cartridge with Circulation Gland

• Part of Flexaseal’s integrated/platform single cartridge seal design
• Patented (Patent Number US 7,979,986) Plunger-Lock drive
• Industry’s leading economical single stationary cartridge design
• Homogeneous monolithic seal ring
• Drive mechanisms located out of product, minimizing corrosion and stress-related failure
• Unique shrouded rotary for maximum face protection and reliable startup
• Uniform 360 degree transfer of torque to rotating face
• Seal faces positioned in gland for maximum protection
• Dynamic elastomer moves on nonmetallic surface eliminating fretting
• Faces designed for optimum heat dissipation
• Sleeve is isolated from product
• Hydraulically balanced
• Easy cartridge installation
• Flush position maximizes face cooling
• Metric sizes available

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	6000 FPM (30 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

SS - Single Stationary Single Spring Cartridge with Circulation Gland

• Part of Flexaseal’s integrated/platform single cartridge seal design
• Patented (Patent Number US 7,979,986) Plunger-Lock drive
• Stationary pusher design
• Hydraulically balanced
• Heavy-duty rugged design
• No little springs to clog or fatigue, simply one beefy single spring located out of the product
• Easy cartridge installation
• Sleeve is isolated from product
• Flush position maximizes face cooling
• Shrouded rotary seal ring for maximum face protection and reliable start-up
• Uniform 360° transfer of torque to primary rotating face
• No pins to break or hang up
• Easily upgradeable faces, metallurgies, and elastomers
• Faces designed for optimum heat dissipation
• Metric sizes available

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	6000 FPM (30 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

SB - Single Stationary Welded Metal Bellows Cartridge with Circulation Gland

• Part of Flexaseal’s integrated/platform single cartridge seal design;
• Patented (Patent Number US 7,979,986) Plunger-Lock drive;
• Easy cartridge installation;
• Sleeve is isolated from product;
• Stationary bellows design – maximizes face alignment;
• Hydraulically balanced design;
• Even face loading;
• No dynamic elastomers;
• Only two static O-rings – cost savings are substantial when perfluorelastomer are required;
• Flush position maximizes face cooling;
• Shrouded rotary seal ring for maximum face protection and reliable start-up;
• Uniform 360° transfer of torque to the primary rotating face;
• No pins to break or hang up;
• Fits ANSI standard and big bore pumps;
• Faces, metallurgies and elastomers are easily upgradeable;
• Faces designed for optimum heat dissipation;
• Metric sizes are available.

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	6000 FPM (30 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

RS - Single Rotating Multi-Spring Cartridge with Circulation Gland

• Part of Flexaseal’s integrated/platform single cartridge seal design
• Patented (Patent Number US 7,979,986) Plunger-Lock drive
• Hydraulically balanced
• Homogeneous monolithic seal ring
• Unique shrouded rotary assembly
• Drive mechanisms, springs and the sleeve are isolated from the product, minimizing corrosion and stress-related failure
• The seal faces are positioned in the gland for maximum protection
• A dynamic elastomer moves on a non-metallic surface and eliminates fretting
• The flush position maximizes face cooling
• Metric sizes available

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

57 - Single Spring Cartridge Seal

The Style 57 design serves to keep the sealing faces in contact and positively transmits the drive evenly 360° around the full circumference of the rotary face. This is accomplished by the special spring design, which provides an interference fit. The compression spring is wound either right or left hand depending on shaft rotation.

• Heavy Duty / non-clogging design – no small springs to break or clog
• Simple installation
• Fits ANSI Standard & Big Bore pumps
• Economical to repair
• Unbalanced Design ideal for low pressure applications like waste water
• Available in inch and metric sizes

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	150 PSI (10 bar)
Max Speed:	4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

63 - Stationary Heavy Duty Metal Bellows Cartridge Seal

For Higher Temperature and Dirty Critical Services

• Easy cartridge seal installation of the Style 64 stationary high temperature bellows
• Proven high performance nesting ripple bellows design
• High temperature static grafoil packing throughout seal
• Standard AM350 heat treated bellows with Inconel 718 heat treated bellows option available
• Low expansion alloy face retainer
• Stationary design accommodates higher shaft-to-stuffing box misalignment. The stationary bellows design only flexes once during installation unlike a rotating design which flexes on every revolution. This reduces face movement and increases seal life.
• Upgradable to API design specifications with piloted gland and metal-to-metal confined gland gasket which prevents blow out or extrusion of the gasket
• Flush, quench and drain connections with a throttle bushing
• Bronze steam deflector option available to provide quenching to the inside of the bellows to prevent coke buildup
• Carbon floating bushing option available
• API 682 Type C Arrangement 1 available
• Double-ply bellows core available for higher pressure

Operating Conditions

Max Temp:	800ºF (425ºC)
Max Pressure:	300 PSI (20 bar)
Max Speed:	10,000 SFPM (50 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

PHB - Single Stationary Welded Metal Bellow Cartridge Seal with Plain Gland

These two single cartridge seals are engineered for the most demanding corrosive applications. By minimizing the number of troublesome O-rings and eliminating any media exposure to the sleeves and glands, we have produced two very cost effective solutions to industries’ toughest applications.

• Stationary welded metal bellows design for better face alignment
• In highly corrosive conditions that require expensive upgrades to higher alloy metals like duplex stainless steel, Alloy 20, Hastelloy® C276, the PH seals are an ideal economical solution. Only the wetted parts need to be constructed of these alloys while the larger metal parts such as the gland and sleeve can be 316 stainless steel since they are located out of the product
• The PHB cartridge seal contains only one O-ring which provides substantial cost savings when perfluorelastomers are required
• Seal faces positioned near the lantern ring connection for enhanced cooling from product recirculation
• Rotary seal ring is shrouded for protection
• Short outboard length minimizes nearest obstruction problems
• Hydraulically balanced design
• No dynamic O-rings
• Easy cartridge installation
• Even face loading
• Patented (Patent Number US 7,979,986) Plunger-Lock drive
• Available in inch and metric sizes.

Operating Conditions

Max Temp:	400ºF (204ºC)
Max Pressure:	300 PSI (20 bar)
Max Speed:	6000 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

58 - Heavy Duty Stationary Multi-Spring Single Cartridge Seal

FOR HIGH PRESSURE APPLICATIONS

• Stationary design for maximum face alignment
• Robust and reliable seal face drive
• Hydraulically balanced
• Dynamic O-ring moves to a clean surface
• Springs located out of product to prevent clogging and hang-up
• Rugged construction for high pressure applications
• API compliant with piloted gland to positively center seal assembly and metal-to-metal confined gland gasket which prevents blow out or extrusion of the gland packing
• Carbon floating bushing option available
• API 682 Type A Arrangement 1 available
• Multi-point injection feature available which ensures maximum uniformity of cooling around the entire circumference of the sealing faces, thus eliminating face distortion due to uneven cooling. Ideal for boiler feed and light flashing hydrocarbon services.
• Thicker cartridge sleeve construction to eliminate distortion due to tightening of set screws
• Gland NPT connections: 1/2″ NPT for process side and 3/8″ NPT for atmospheric side to help prevent improper installation

Operating Conditions

Max Temp:	550ºF (290ºC)
Max Pressure:	1200 PSI (80 bar)
Max Speed:	10,000 FPM (50 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

53A - Heavy Duty Rotating Metal Bellows Cartridge Seal

For Medium Temperature and Dirty Critical Services

API 682 Arrangement 1
Type B Seal
Configuration 1CW-FL

• Heavy duty cartridge design
• Self-cleaning rotating bellows
• Hydraulically balanced
• Multi-point injection arrangement
• Piloted gland to positively center seal assembly
• Flush, quench, drain gland with 1/2″ NPT for process side and 3/8″ NPT for atmospheric side to help eliminate improper piping assembly
• Carbon floating bushing
• Metal-to-metal confined gland gasket
• Double ply bellows designs available for higher pressures

Operating Conditions

Max Temp:	400ºF (200ºC)
Max Pressure:	300 PSI (20 bar)
Max Speed:	4500 FPM (23 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

ECON - Single Econ Stationary Bellows Cartridge Seal

• Simple and solid single cartridge seal construction
• No dynamic elastomers – the most common failure point with multi-spring pusher seal designs
• Only one O-ring (especially economical if perfluoroelastomer required)
• Stationary welded metal bellows designed for better alignment
• Hydraulically balanced
• Seal faces positioned near lantern ring connection for enhanced heat dissipation
• Hastelloy® C276 bellows

Operating Conditions

Max Temp:	400°F (204°C)
Max Pressure:	300 PSI (20 bar)
Max Speed:	6000 FPM (30 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

RBX-AQ - Metal Bellows Cartridge Seal for Aquarium Industry

Corrosion Resistant Welded Metal Bellows Cartridge Seal For Marine Applications

• Large gland connections for cooling
• Hydraulically balanced seal faces
• Simple, rugged cartridge seal design
• Patented (Patent Number US 7,979,986) Plunger-Lock drive is located out of the product and sealed in a clean environment

Advantages

• Hastelloy® C276 rotating welded metal bellows are designed to self-clean during operation
• Only two static O-rings – no shaft fretting & no hang up
• Split-collar design – protects shaft sleeve from set screws
• O-rings located away from seal faces
• Corrosion-resistant metallurgy
• Exchange Program – discounts based on competitor core exchange
• Easy Installation – no measurements or modifications required!

ANSI Flex Seal Line ARB3, ABRB3, ASMS3, ABSMS3 for Chemical Process

Conventional pump stuffing boxes were originally designed to accommodate packing materials. Over the years mechanical seals edged out packing as a preferred sealing method, however stuffing boxes essentially remained the same. This situation posed complications for the effective operation of mechanical seals including installation issues, potential damage from abrasive product, and poor dispersion of seal-generated heat.

The ANSI Standard ASME B73.1 Specifications for Horizontal End Suction Centrifugal Pumps for Chemical Process includes specifications to improve the reliability and safety of the B73.1 pump design. One major specification focuses on cylindrical (big bore) and self-venting (tapered bore) seal chambers. Both of these seal chamber designs address the issues that plagued conventional pump chambers by providing additional radial clearance for mechanical seal operation and for increased liquid circulation around the seal, enabling the seal to run cooler and longer.

Features of the ANSI Flex Seal Line

• Big Bore faces: larger OD for additional radial clearance and seal cooling
• Both standard and big bore glands supplied with 3 connections to accommodate any piping plan
• Set clip redesign for even easier seal installation
• Rotating design uses centrifugal force for self-cleaning
• Uniform 360° transfer of torque to the rotating face
• Welded metal bellows replace the dynamic elastomer which can hang up the seal faces
• No springs to clog or break
• No fretting
• Only two (2) static elastomers – eliminate seal failures caused by dynamic O-ring “hang up” and offers cost savings when upgrading to Perfluorelastomers
• Stationary springs and drive pin mechanism isolated from process fluids to minimize corrosion, clogging, and stress-related failures
• Unique, metal-shrouded rotary seal ring for maximum face protection and uniform 360° transfer of torque to the rotating face during start up
• Dynamic elastomer moves on non-metallic, smooth surface eliminating fretting
• Stationary design for optimal face alignment

 

Operating Conditions

Temperature:	400°F (200°C)
Pressure:	300 PSI (20 Bar)
Speed:	4500  - 6000 FPM

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

 

HPCS - Single Triple Ply Welded Metal Bellows Cartridge Mechanical Seal

For High Pressure Crude Oil Applications

• API 682-compliant design is heavy-duty with a long sealing life and easy repairability.
• Exclusive triple-ply welded bellows technology operates in pressures up to 1500 psig while accommodating significant axial movement.
• All seal elastomers are static, eliminating dynamic O-ring wear and damage.
• Choose from three (3) standard secondary bushing arrangements to accommodate Plans 65A and 66A.

Operating Parameters in Crude Oil

Pressure:	up to 1500 psig (103.4 bar)
Temperature:	up to 180°F (82°C)
Speed:	up to 3600 RPM
Shaft Sizes:	up to 5.50” (139.7 mm)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time.

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