Dewrance Extraction Check Valves

Wedge Gate and Parallel Slide

Features & Benefits:

Excellent Reliability

• Internal Counterweight to help balance disc under low load conditions.
• Direct deposited seats.
• Tilting disc design for quick closing due to lower center of gravity.
• Lightweight disc with minimum travel, for quick closing in less than one second.
• Designed for optimum performance under all flow conditions.
• Self-draining geometry.
• Pneumatic Power Assistance acts directly onto disc, without leakage to help avoid inhibiting operation.

Low Cost Maintenance

• Expanded graphite gasket pressure seal design.
• Nitrided hinge pin, supported in nitrided bearings, helps give a low coefficient of friction and hard wearing surface for maximum performance.
• Easy access through cover.
• Longer seat life due to non-scuffing action of seat to disc geometry.
• Simplified seat refurbishment, only requires lapping.

Improved Performance

• Aerodynamic self aligning tilting disc design for low pressure drop characteristics.
• Automatic self closure on flow reversal.
• Inclined seat geometry, combined with conical seat and disc, for tight seal without scuffing.
• No hinge pin gland helps avoid inhibiting performance.