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The Diaphragm/Weir Type Control Valves is essentially a simple pinch clamp, closed by pressing a flexible diaphragm against transverse weir, when fully closed, the diaphragm seats against the weir providing a leak tight closure.
It is recommended for handling sticky and viscous fluids, slurries and highly corrosive and hazardous substances and other hard to handle mediums or where tight closure is prime factor. It is the most ideal valve to handle fluids that require high purity and should remain free from contamination.
The Diaphragm/Weir Type Control Valves is a simple pinch type valve and of low pressure type because of large area of diaphragm and is extensively used for both On/Off and throttling services and finds its application in Waste & Water Treatment Plants, Filtration Plants, Chlorination Plants etc
| DESIGN | Confirm to BS – 5156 |
|---|---|
| BODY TYPE | Weir ( Rubber Lined – Series 410 )
( Unlined – Series 430 ) ( PFA Lined – Series 440 ) |
| VALVE SIZE | 15mm to 300mm ( 1/ 2” to 12” ) |
| END CONNECTION | ANSI B 16.1Class 150 |
| BODY MATERIAL | Cast Iron ( IS 210 grade FG 200 )
Cast Steel, Other alloys on request. |
| LINING MATERIAL | Ebonite, PVDF, PFA, PP, EPDM,Glass etc. |
| LINING HARDNESS | Ebonite-95° ± 5 Shore A
Natural/Neo Rubber-55° ± 5 Shore A PTFE-Rockwell/Shore R100 D78 or D62 Glasslining & FRP-Parcol Parcol 40 Respectively. |
| LINING THICKNESS | 15 to 65 mm Valve – 3.0 mm
80 to 100 mm Valve – 3.5 mm 125 to 150 mm Valve – 4.0 mm 200 to 300 mm Valve – 5.0 mm PTFE Coating Thickness – 800 micron, Glass Lining – 1.5mm. |
| BODY DIAPHRAGM | Neoprene, PTFE Backed with Neoprene
Butyl, Viton, Hyplon, Nitrile, EPDM. |
| LEAKAGE RATE | As per ANSI B 16.104 Class VI (100% Leak tight.) |
| TEMPERATURE | – 30°C to 80°C |
| FLOW CHARACTERISTICS | On/Off, Throttling. |
| TESTING STANDARD | BS 6755 Part – I |
| ACTUATOR TYPE | Diaphragm or Motorised or Cylinder |
| ACTUATOR ACTION | Direct Acting – Normally Open ( Air to Close )
Reverse Acting – Normally Close ( Air to Open) |
| SPRING RANGE | 3 – 15 PSIG ( 0.2 – 1.0 Kg/cm² )
8 – 20 PSIG ( 0.4 – 2.0 Kg/cm² ) 18 – 30 PSIG ( 1.2 – 2.0 Kg/cm² ) |
| AIR SUPPLY | 20-50 PSIG (1.4-3.5 Kg/cm²) |
| AIR CONNECTION | 1/ 4” or 1/ 2” NPT |
| ACCESSORIES OPTIONAL | Top or Side Mounted Handwheel, Limit Switches Airset, Valve Positioner etc. |