APPLICATION

For unidirectional shutoff of liquids, solids and slurries in vacuum or pressurized conveying systems.

FEATURES

• A lug type wafer design of sleek construction for low headroom mountings.
• Gate having bevelled knife edge at the bottom to cut through solid particles settled at bottom of body and achieve full closure.
• Gate fully withdrawn in the housing upon opening, thereby offering uninterrupted flow.
• Sealing achieved by means of integrally cast! welded jams pushing the gate on to the seat for a full face contact between gate and seat.
• Double / triple ply Synthetic yarn with PTFE packing glands provided with externally adjustable pusher arrangement to tighten the packing on the gate and avoid leakage through the rear of the valve.
• Non rising spindle for compact operation and increased safety.
• Gate opening indicating arrangement to find out the extent of gate opening and closing.
• Double start threaded spindle for faster opening and closing.
• Wide variety of material options - please contact us for more information.
• Seal retainer ring in soft seated ZFT-STD valve to protect valve parts against erosion and direct the flow towards centre.

SEALING OPTIONS

• Integral metal to metal seat in knife gate valve type: ZFT.
• Metal to soft seat with seal retainer ring in knife gate valve type: ZFT-STD.

OPERATING OPTIONS

• Manual handwheel / Chain-wheel Motorised / Electro pneumatic.

FLANGE OPTIONS

• DIN PN10 / ANSI 150B 16.5 with raised face / IS: 1538-1993 with raised face. Other flange drilling options available on request.

STANDARD SIZES

• DN 50,65,80,100,125, 150,200,250,300,350,400,450,500, 600,700,800,900,1000 ,1200 mm. Sizes above DN 1200 mm can be offered on request.

LEAKAGE TESTING (Seat) .

• Conforming to MSS SP-81 for valves up to 600mm size. For higher sizes proprietary norms shall be applicable.
• For Rubber seated valve - no visible leakage.
• For Metal seated valve -40cc/minute/inch (25.4mm) of valve diameter at 40 PSI (2.8bar) across the seat.

BODY TEST PRESSURE

• 1.5 times of normal working pressure, or
• Max. 10 bar for valves up to 250mm size in cast iron body.
• Max. 6 bar for valves above 250mm & up to 600mm size in cast iron body.
• Max. 4 bars for valves above 600 mm size in cast iron body.
• Max. 10 bar for valves up to 600mm size in steel! stainless steel body.