Chesterton’s 225 Dual Seal features in-series (tandem-oriented) configuration for maximum reliability in sealing volatile and hazardous fluids.

In-series dual seals are recommended for the most demanding leakage control requirements.

• Exclusive Dynamic Stress Relieved face design for superior emissions control capability.
• Stable sealing under fluctuating conditions.
• Patented features assure precision alignment from start-up.

The 225 seal is also available in API and CPI configurations

Chesterton’s 225A Dual Seal is designed to API 610 Configuration

• 1/2" NPT Connections
• Bolt Holes and Pilot machined to fit specific equipment
• API 610 Gland with Quench and Drain Ports optional

Chesterton’s 225CPI Dual Seal offers all the features and benefits as a 225 Dual Seal with Slotted glands for CPI applications.

Chesterton’s 225 Dual Seal

• Controlled balance and superior pressure handling in double or tandem barrier mode. 
• Features in-series (tandem-oriented) configuration with both inboard and outboard sets of faces oriented in the same direction and the outboard faces sealing on the outside diameter.
• Brings controlled hydraulic balance to both sets of faces,with 60/40 inboard and 70/30 outboard in double mode,and 70/30 for both sets in tandem mode.
• In double mode, barrier fluid pressure can reach 250 psi (17 BAR) over process pressure,while in tandem mode,the 225 can handle up to 600 psi (40 bar) inboard and out.
• Gas assisted version for emissions control and superior sealing.
  • Use nitrogen,compressed air or steam to pressurize the barrier fluid.
• Simplifies seal environmental controls and eliminates risk of process contamination from liquid barrier fluid.
• 225 Dual Seal contains leakage in 2 ways.
  • Process is sealed positively,while full contact faces seal the barrier fluid from leakage to atmosphere or into process.
• Achieve total emissions management.
• Rated to 0 (zero) ppm configured with vapor recovery system.
• Can be fitted with check valve and optional alarm to detect and control inboard seal leakage.
• Self-lubricating outboard faces with proprietary materials and finishes for intermittent dry running provides secure backup for inboard seal.