UNI-DIRECTIONAL

UNI-DIRECTIONAL

Flow-Tekvalve is our determination to maintain the highest quality, consistently. Our manufacturing facilities, all located I Ahmadabad in Gujarat in India is equipped with modern machinery and a team of highly skilled engineers and technicians. Including critical operations such as, machining of body and assembly and testing, to ensure consistent quality. The entire operation is linked to a quality assurance system offering high traceability and an ERP system to ensure operational efficiency.

TypeWafer, full lug, uni-directional knife gate valve; rising stem hand wheel
Typical ApplicationsMedium & Heavy duty applications
Sizes available50-1200mm (2 to 48)
Pressure rating
Cast iron body : CWP 10 bar, 50-300mm (2"- 12") size; lower on higher sizes
Steel/St. steel :CWP 10 bar, 50-600mm (2"- 24") size; lower on higher sizes
Face-to faceComplies with MSS SP-81 (upto 900mm (36") size)
DrillingTo suit ANSI 150lb,AS 2129 Table D & E, DIN PN10 (others on some sizes)
Material availability standard; others on request
Body WCB, CF8, CF8M, CF3, CF3M, CN7M, CD4MCuN, etc
 
Gate304, 316 st. steel (ANY OTHER MATEARIL AS PER REQUIRMENT)
PackingPTFE syntex fiber standard; others on request
Seat / Leakage Metal-to-metal - As per MSS SP-81 (upto 900mm (36") size
Resilient seats - EPDM, Chloroprene, Viton - Zero leak
PTFE - Max leakage of 4cc/min/inch (upto 600mm (24") size
SuperstructureSteel, epoxy painted
Handwheel Cast iron, epoxy painted

Uni-Directional gate valves
Knife gate valve is one of the application-specific designs among industrial valves. These valves are designed to handle basically non-clean media with features that ensures minimum contact between moving parts of the valve. This is achieved by having a precision-ground gate that is held between layers of gland packing with almost no contact between the body parts and gate during most of its travel

The seating itself is accomplished with an almost non-sliding motion aided by jams located in the body. Avoiding sliding contact between gate and body permits this valve to handle abrasive particles present in the media much better than conventional designs. Another feature is the beveled bottom edge of the gate (from which it derives the 'knife' in its name) which allows positive closure of the gate even when solid particles settled at the bottom of the body.

In handling abrasive media, deflection cones are generally used in order to avoid direct impingement of the media on the seat surface; hard facing of body or seating parts is also sometimes used. Purge connections which let in suitable fluids at pressures higher than line pressure are Welded-jams with relieved inlet area also sometimes provided in these valves to clean seating surfaces(body purges) and packing area (chest purges). This minimizes abrasive wear and tear during valve opening and closure.

Knife gate valves are excellent hopper isolation valves with their ability to cut through flowing powders and close by dislodging any material in the seating area. This is also perhaps the only valve design which can tolerate differential thermal expansion of its parts without affecting its functions, thus making an ideal choice for handling high temperature media.

  • Oil refineries.
  • Water, steam, air, gas and liquids having corrosive properties.
  • Suitable for wide range of working conditions of pressure and temperature ratings.

Product Range

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