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John Crane - A part of Smiths Group
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Type 3740

Advanced Design, Wet-running Cartridge O-ring Split Seal

The 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.


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Features

  • 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.

Parameters

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

Recommended Applications

  • Process Pumps
  • Mixer and Agitators
  • Other Rotating Equipment

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