Split seals | Heavy-duty Cartridge Seal for Boiler Feed Circuit Applications
Features mechanical seal Type 3740
- California Residents: PROPOSITION 65 WARNING
- Factory-preassembled rotor assembly for fast and easy, yet precise, rotating face installation.
- Separate stationary seal face for visual assurance the halves are correctly aligned.
- Factory-preassembled gland plate assembly for easy, single-step installation.
- Balanced primary ring design for increased pressure capability.
- Premium seal face materials for optimal performance.
- Captive socket head cap screws to eliminate lost or dropped screws.
- Same-side screws on all hardware for easy access and faster installation.
- Dovetail O-ring grooves to contain all O-rings without requiring adhesives.
- Fast and easy field repair kits that do not require any special tools, adhesives or procedures.
- Two connections in the gland to provide easy access for flush piping.
Recommended Applications Type 3740
- Process pumps
- Mixer and agitators
- Other rotating equipment
About Mechanical seal Type 3740
The Type 3740 mechanical seal family, are split seals that use the latest modular split seal technology from John Crane. This combines the unique design requirements for wet-running and dry-running services onto one common seal platform.
The Type 3740 wet-running split seal incorporates the best features for fast and easy seal installation, while providing reliable seal performance in demanding pump and other rotating equipment fluid services.
Design Features mechanical seal Type 3740
- Factory-preassembled rotor assembly for fast, easy yet precise
rotating face installation - Separate stationary seal face for visual assurance the halves
are correctly aligned - Factory-preassembled gland plate assembly for easy, singlestep installation
- Balanced primary ring design for increased pressure capability
- Premium seal face materials for optimal performance
- Captive socket head cap screws to eliminate lost or dropped
screws - Same-side screws on all hardware for easy access and faster
installation - Dovetail O-ring grooves to contain all O-rings without requiring
adhesives - Fast and easy field repair kits that do not require any
special tools, adhesives or procedures. - Two connections in the gland to provide easy access for flush
piping
Material mechanical seal Type 3740
- Face/Primary Ring: Carbon
- Retainer/Disc/Drive Band/ Spring Holder: 18-8 Stainless Steel
- Bellows: Buna-N
- Springs: 18-8 Stainless Steel
Operating range mechanical seal Type 3740
- Temperature Limits
250°F/121°C - Pressure Limits
Excursion: 450 psi(g)/31.0 bar(g)
Continuously: 300 psi(g)/20.7 bar(g)
- Speed Limits
3500fpm/17.8m/s
- Runout
0.060″/1.52mm TIR
Product Description Type 3740
he Type 3740 is a family of split seals using the latest modular split seal technology from John Crane that also combines
the unique design requirements for wet-running and dry-running services onto one common seal platform.
- The Type 3740 wet-running split seal incorporates the best features for fast and easy seal installation, while providing reliable
seal performance in demanding pump and other rotating equipment fluid services. - The Type 3740D dry-running split seal is designed for the large
shaft run-out and harsh operating conditions commonly associated with top-entry vessel mixing services and other dry-running applications.
