D Class - Dual Plate Check Valve

Valve Type

• WAFER - DW Class Dual Plate Check Valve
• LUG - DL Class Dual Plate Check Valve
• FLANGE - DF Class Dual Plate Check Valve

Standard Compliance

• The face to face dimension shall be in accordance with API594, or other STANDARDS are available upon request.

Producing Range

• Size : DN 50 to DN 1800(2inch ~ 72inch)
• Working Pressure : up to 25bar
• Working Temperature : -20°C~+160°C

Connection Flange

• ANSI B16.1 CL.125LB & B16.5 CL.150LB / MSS SP44 CL.150LB
• AN2129 Table D & E / EN 1092 PN6, PN10 & PN16
• BS10 Table D &E / DIN2501 PN6, PN10 & PN16
• ISO 7005 PN6, PN10 & PN16 / KS / KIS 5K, 10K, 16K & 20K

Face to Face Dimensions

• Conform to API 594

Application

The short face-to-face design makes dual plate check valves more compact and lighter, providing easy installation and less expensive costs than conventional swing check valves.

This design is standard on all ANSI series 125lb through 2500lb valves.
316ss Springs and INCONEL X-750 springs are mostly used with other materials available to meet all service conditions.

The torsion spring is desinged to maximize reliability and minimize pressure loss and quickly close the check valve at zero flow to prevent slamming and water hammer commonly associated with many types of other check valves.

Design Features

• The self acting pivoting check valve of the double disc.
• Maintenance free. The design is compact and space saving.
• The superior closing response prior to flow reveal.
• The corrosion resistant springs are designed to quickly close the valve at zero flow to prevent undesirable pressure surges. in the closed position the valve is tight shut off.
• It opens automatically when the flow atart again.
• The elastomeric seat is vulcanized and bonded to the body casting.
• It is out of the low path thus ensuring extended seal life.
  Spherical profiling of the seat ensure positive shut-off even at low pressures and the area adjacent to the seat is also protected by the same elastomeric material.
• Attention paid to the streamlining of the flow path is paramount if good flow characteristics are to be achieved.
• The saving of energy costs by selecting a check valve may be several times the initial cost of the valve
• The use of these design features togerher with careful material selection makes a product with high reliability and low operating costs.